(mid '80's)  $480

In pristine cosmetic condition, this pair of Yamaha NS-500M (monitors) was the "baby brother" of the famous Yamaha NS-1000M speakers.  All the drivers are fully functional.  The crossovers were checked, all the caps were found to be well within their original values.  A factory spec sheet for the NS-500M is included.

The drivers:
Woofer: 12" with a carbon-fiber cone JA3109
Midrange: 4" titanium carbide "semidome" driver JA1214
Tweeter: 1.2" beryllium dome JA0544
Tweeter: 1" iron-plated titanium T16

Enclosure build quality: 
The sealed enclosure is constructed with solid cross-bracing and a three-way mitered joint technique for ideal rigidity. The front baffle is 1.2" thick, while the other five sides are 0.78" thick.

Adjustable controls: 
For midrange and high-frequency levels

Essential specs:
Type: 3 way, 3 driver loudspeaker system
Frequency Response: 40Hz to 20kHz
Power Handling: 200 watts max
Crossover Frequency: 700, 5000Hz
Nominal impedance: 6 ohms
Sensitivity: 91dB
Dimensions: 15"W x 27"H x 12.8"D
Weight: 51 lbs each

About Yamaha and the NS-1000M & NS-500M
Yamaha designed both models to provide a highly neutral and resolving loudspeaker for the professional studio market, aiming to create a reference monitor that would ensure sound mixes would translate well across different systems. They adapted their consumer models by using smaller, stiffer cabinets and an updated woofers to deliver a cleaner, faster sound suitable for recording and broadcasting. The key goal was to achieve sonic excellence with a flat, neutral frequency response, making it easier for audio engineers and audiophiles to fine-tune sound for different audiences.
The monitors were essentially adaptations of their consumer-focused NS-1000 & NS-500 transferring their strengths to the professional market. The modifications, such as the more robust cabinet and the upgraded woofers. 

About Yamaha...
Yamaha is regarded as one of the largest manufacturers of audio and visual products in today’s Hi-Fi community. With their history brimming to the top of the historical timeline, here's a closer look at this manufacturer whose reputation has only grown stronger over their years of activity.

Yamaha’s creator, Mr. Torakusu Yamaha, originally started out as a manufacturer of reed organs in 1887. Back in that era Yamaha’s name was originally the Nippon Gakki Company, Ltd – translating into full English as ‘Japan Musical Instrument Manufacturing Corporation’.  Yamaha’s intriguing and renowned logo features three tuning forks at alternating angles and still remains their corporation logo today. After the Second World War, Yamaha’s factories were re-commissioned to also manufacture motorcycles for easier travelling in the cities, and at prices people could afford – something that Yamaha is still good at doing now in all of their ventures.  Their considerable lineup of high quality vintage amps, integrated systems, receivers, turntables and speaker systems remain some of the most desirable to own by serious audiophile collectors around the world.

Yamaha progressed to even more musical instruments, including superb pianos, vibraphones, woodwind instruments, string instruments and drum kits. As their reputation in the music industry grew and grew stronger, their technological abilities followed suit. In more recent years Yamaha ventured into the world of synthesizers and samplers, setting an example to their peers in the studio environment. However, as they gained ideas within the digital sector, Yamaha established themself as a superpower in the Hi-Fi world as they engineered superb examples of Hi-Fi products; they were one of the first corporations to build a CD Recorder in 1989.

Today, in 2025, Yamaha audio is still owned by the Yamaha Corp.

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near-field studio monitors ('87-'03)   $650

In very good cosmetic condition, this pair of JBL 4408 studio monitors are a high quality 2-way system.  They feature beautiful real timber (walnut) veneer enclosures and classic acoustically transparent speaker grills.  These are 100% original.

The woofers have been refoamed and the tweeters' damping foam has been replaced. Each of the enclosures have unobtrusive corner solid brass protectors.  The original grills are also in great shape and have the original JBL badges. Speaker stands shown in any of the photos are not included.

With a continuous production run of 16 years, the 4408 (and 4408A) were some of the longest continuously produced models in JBL history.  The 4408 vs 4408A: the original 4408 featured a genuine walnut enclosure, 8" felted cone woofer (116H2)  & titanium tweeter (035Ti), oval shaped bass port and front L-pad.  The 4408A used a vinyl laminate coating, same woofer, slightly different HF driver (052Ti), round bass port and did not have an L-pad.
NOTE: titanium dome tweeters are a technology pioneered by JBL

The 4408 is described as "near field monitors" for a reason; Technically speaking, the 4408 was primarily intended for direct-field monitoring in close-in broadcast applications, where the close driver spacing creates a
coherent sound source.

However, for the rest of us, when the 4408 is in a "typical" listening room other than a HiFi recording engineer's studio, one would assume an approximate 10' x 10' (or slightly larger) critical listening area.  In this environment, the 4408 are in their glory.  Assuming the speakers are off the floor, (either hanging in brackets or sitting on some type of isolators) all it takes is a few tweaks on the L-pad and the listener can "tune" the soundstage to within their own particular hearing-comfort zone. 

Even though they are rated at an "easy-to-drive" 8 ohms and 89dB sensitivity, the 4408 (in our humble opinion) will really come alive when driven by high quality amplifier power.  Generally speaking, because the loudness of a speaker does not always equate to sonic perfection, the pure build quality of the amp allows the speaker to also perform better at lower volumes.The 4408 is right up there with the best of the 80's & 90's JBL monitor designs.  Of course the limitations of a 2-way speaker design vs 3-way leaves room for a lot of chatter about what's best for each listener's needs or budget. 

The bottom line? 
Let YOUR ears decide; that's all that matters...

SPECS: 
Frequency Response: 50Hz to 20kHz /
Power: 100 watts /
Crossover: 2500Hz /
Impedance: 8 ohms /
Sensitivity: 89dB /
Bass: 8" felted cone 
Tweeter: 0.25" pure titanium dome /
Finish: real walnut /
Dimensions: 17.2"H x 12"D x 11.5"W /
Weight: 26 lbs each

About JBL...
In 1927, one of the original pro-audio companies, Western Electric, pioneered cinema sound with 'The Jazz Singer'. In the Wall Street crash of 1929, Western Electric was split up. From the ashes, came Westrex (who are today still involved in the movie/video side of the business) and Altec, short for 'All technicians', because the new company's bosses and founders were the technical people from Western Electric. Most notable of these was James Buoloh Lansing, and when he became president, Altec took on his surname, thus Altec-Lansing. Like Western Electric, Altec-Lansing's main business was in cinema sound, but along with RCA, this is where high-power, large-scale sound reinforcement was pioneered, horn speakers being their forte.

In 1940, Lansing sold his shares and later set up his own, competing company, with an emphasis on speakers. Lansing was subsequently killed in a plane crash in the late 40s, but the company he founded - James B. Lansing Inc. - or 'JBL' as it's better known, has gone from strength to strength.

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('94-'01)  $500 

These are high quality AV surround speakers that were originally part of the KEF THX Certified Reference Series and were among the first THX-approved home theater products released by KEF.

The TDM 34DS were known as one of the best dipole surrounds of its era, noted for its Uni-Q driver array that created a diffuse, enveloping sound field for surround effects. 

They are finished in cream color.  KEF intended that these speakers should be mounted on walls but stand mounted is also fine.  These should be used with a high quality processor or amp. As a stand-alone pair by themselves, they certainly produce very accurate and amazing sound, 

NOTE:  the exotic and distinctive speaker stands (made of white metal and wood) shown in the photos are available at an additional cost of $150/pair.

Complete specs:
System type: Three-way, wall-mount
Enclosure type: Closed box
Dimensions 11.6"H x 16.5"W x 7.7"D 
Weight: 21.5 lbs each
Nominal impedance: 4 ohms
Power handling: 150W
Frequency response: 80Hz to 20kHz +/-3.0dB (-6dB at 65 Hz)
Sensitivity: 88dB at 1m for 2.83V
Maximum output: 112dB
Finishes: Cream
System: SP3277
Drive units: B169 bass unit (SP1387), 2 x B160 midrange unit (SP1396), 2 x NT19 tweeter (SP1367)
Crossover network: SP2307

About KEF...
It all began in 1961, as it so often does, with one man who was somewhat detail-obsessed. And in the world of hi-fi (or indeed, anything grounded in innovation, technology and perfection), that man, was Raymond Cooke, a former technical director for Wharfedale speakers (England).  In the beginning, their tendency to sell raw drivers to their competitors – rather than keep them for themselves  – solidified them as true leaders in this field.  

They went on to produce the K1 Series but with the 1962 introduction of the now world famous B139 bass driver, the Celeste was born. It proved to be a best seller but it wasn’t until the 1970s that their real breakthrough occurred.  After a series of very successful commercial loudspeaker designs, 1975 saw a development which placed KEF on the hifi map. Indefinitely.

Thanks to t​he first implementation of computers in the design and measurement of their loudspeakers, t​his lead to the world famous KEF ​Reference designs emerging for the first time, from the 101 all the way through to the 105.2. The first of many lines of References, each dominating its market.

Everything about what KEF ha​s​ produced since day one has screamed of quality, of innovation and of style… three very memorable qualities. And when you have a company history (not to mention product range) as long and as illustrious as KEF’s, there are some seriously impressive things to remember.

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('00-'02)   $400

In excellent cosmetic condition, completely original, fully serviced and tested, this pair of Snell THX/ICS-1000 are very rare.  The speakers are built incredibly well and, at 42 lbs each, are heavier than one might imagine than "typical bookshelf or surround speakers. 

Each rectangular cabinet has real dark walnut veneer and features a very unique 1" horn loaded black-anodized aluminum-dome tweeter (which can be rotated) and two Peerless 6.5" poly-cone, long excursion mid-bass drivers in a sealed enclosure.

This model used Snell’s "eXpanding Array (XA)" technology which combines driver size, spacing, crossover frequency and slope.  This design creates a driver array with "near constant vertical directivity" that provides a wide sweet spot.  Today, some 20 years later, the Snell THX/ICS-100 an/or their Ultra Series are way under the radar and a bit of a secret.  Their chief designer, Kevin Voecks, eventually went to work for Revel, also a high end speaker company.

When first released by Snell in 2002, the THX/ICS 1000 were part of Snell's various different configurations of their THX Ultra Series.  However, in any high quality stereo system, this pair will provide superb sound with two-channel sources. They have excellent bass response.  You can add a subwoofer if you REALLY want some bass on the down low but it's not really necessary.

Now, here's the interesting part...the rear of each enclosure has three switches:
1) Bass Loading to compensate for placement close to room boundaries.   
2) Dispersion pattern
3) Treble Level to "tune" the high frequency to the "brightness" of the room.

Features:
THX Ultra2 certificationeXpanding Array design 
Switches for bass, treble and dispersion 
Biamp or biwire compatible
Five-way gold-plated binding posts

Basic specs:
105dB continuous output (with a 250-watt amplifier)
Impedance: 4 ohms
Dimensions: 16.5"H x 13.5"W x 11.5 "D
Weight: 42 lbs.


About Snell Acoustics...
Snell Acoustics made some pretty amazing speakers in the U.S.A. for more than three decades.  The company was founded by Peter Snell in 1976 and even though he passed away in 1984, the company continued to manufacture high-end loudspeakers in Massachusetts until 2010.  

Snell was a perfectionist about the sound and the build quality of his speakers. The cabinets were exquisitely finished, but the amount of handiwork invested in the parts the customer never saw was even more impressive. Though most of the better speaker manufacturers demand a minimum measurement variation for their suppliers' tweeters and woofers, Snell went the extra mile and hand-tuned each crossover network to compensate for the drivers' response irregularities. Then a computer measured the speaker's response, and a technician noted the difference between the desired flat curve and the speaker's actual frequency response.  

The hand-tweaking process continued until the speaker measured within Snell's unusually tight tolerances. The painstaking effort ensured all completed speakers measured within exceedingly tight tolerances (+/-0.5 decibels) of the original design prototype. Every Snell buyer heard exactly what the designer intended.  All Snells, including the most affordable models, were built this way, and all cabinets were assembled and finished by hand.

Few American speaker companies continue to maintain that approach; most outsourced manufacturing long ago.  In 1990 the company teamed up with Lucasfilm to design the first line of THX loudspeakers, the 500 series and first In-Wall THX system. Snell speakers were used in Lucas Skywalker Ranch's screening rooms.  Finally, the company was a leader in acoustic technology, including pioneering THX loudspeakers with Lucasfilm, until it was sold to Boston Acoustics in 1995 and eventually acquired by D&M Holdings in 2005. Alas, Snell Acoustics ceased manufacturing in 2010.

About THX...
The first film that most probably saw in a THX Certified movie theater was Top Gun, almost 40 years ago. Back then few knew exactly what THX was, but since Tom Cruise was cool and the F-14s were even cooler... the sound was spectacular.   Soon afterward, the THX Certification program expanded to include home-theater equipment and Snell Acoustics became the first licensee. Snell had been manufacturing highly regarded THX Certified and non-certified speakers for many years until their demise.

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(Denmark, 2008)  $650

Very rarely seen in the USA...
In spectacular cosmetic condition, completely original and fully operational, this stunning pair of Jamo S-606 were first introduced in 2008.  They were thoughtfully designed using luxurious "dark apple" (aka cherrywood) laminate for the sidewalls and narrow strips running the length of the front of the baffles.  The rest of the enclosures feature piano black gloss laminate for the tops and front baffles.  Removing the grill reveals the inline drivers with the mids featuring silver metallic phase plugs.  

These flat-out gorgeous S-606 towers are a very high quality speaker system with each enclosure weighing in at about 53 lbs each.  In our humble opinion, the S-606 sound even better than they look.

The S-606 is a 3-way bass-reflex design (ports on the rear) with five-way gold plated binding posts and jumpers.
Each 42" tall cabinet features a single soft dome 1" tweeter (with textile base) and two 5" MF/LF (midrange) drivers (fitted with heat dissipating metallic phase plugs instead of dust caps.)
The tweeter and mids are placed into a separate sealed compartment that improves isolation with the woofer.  The 8" woofers are placed on side walls of the lower part of the enclosures.

Reviewed everywhere, the consistent comments were "the Jamo S-6060 are focused, dynamical, open, accurate, and neutral by tonal balance".
We might add that, like every high quality speaker system, it's best to drive them with good quality amp power to bring out the best they have to offer.

Specs:
System type:  3-way
Enclosure type:  Bass-reflex
Frequency response: ± 3dB42 - 20000 Hz
Nominal impedance: 6 Ohm
Amplifier Requirements:  15 - 210 watts
Sensitivity: (2.83V/1m)89 dB
Dimensions: 42"H x 7.5"W x 13.5"D
Weight: 53 lbs. each

About Jamo...
Jamo is a Danish manufacturer of loudspeakers.  The company was founded in 1968 by Preben Jacobsen and his brother-in-law, Julius Mortensen. The company name is derived from the founders' surnames. At one point, Jamo employed more than 400 workers at its factory in Glyngore and grossed hundreds of millions of dollars; in 1994, it was Europe's largest speaker manufacturer.

In 1998, the company had produced and sold more than 11.5 million units. In 2002, businessman Anders Hoiris was hired as director to reverse declining sales. His efforts proved unsuccessful; a major company backer, FSN Capital, then transferred its interest in the brand to Jystke Bank.  Hoiris then resigned. Company production has, since 2004, been located in China. Jamo was taken over in 2005 by the well known American firm Klipsch Audio Technologies which Hoiris had arranged for before his departure.

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('95-'05)   $250

Obtained from the estate of the original owner, this pair of Cambridge SoundWorks Model Six are in absolutely pristine cosmetic and operating condition.  The drivers, crossovers and light grey grills are completely original.  Each teak veneer enclosure contains a single 8" acoustic-suspension woofer (newly designed at the time by Kloss) that crosses over at 2 kHz to a 1.75" cone tweeter with a 0.5" center dome (the same tweeter used in Cambridge SoundWorks’ costlier Ensemble systems).
At about 18" tall, they are not quite big enough to be considered a floorstander yet almost too large to be a bookshelf system, the Model Six handles very large transient power levels without damage or even serious audible effects. 
A typical review stated "one would expect the Cambridge Sound-Works Model Six to be a very fine-sounding speaker, and one would be right. Its clarity and precise imaging reflect Kloss’s extensive 'voicing' of the speaker to give it the optimum octave-to-octave balance. As for the lows, although the Model Six won’t rattle the windows or make your ears pop with the pressure of low organ notes, you will know when they are present. It has an “all there” sound quality that does credit to its heritage."

Back story:
In 1958, *Henry Kloss designed the now-legendary KLH Model Six, the first speaker system to exploit the potential of two-way design to provide extraordinary performance at a moderate cost. Then, in 1968, he took the two-way concept even further with The Advent Loudspeaker, one of the bestselling speaker models of all time.   Finally, in 1995, Kloss had come full circle to yet again exploit the cost/performance advantages of a properly conceived two-way loudspeaker. The result was Cambridge SoundWorks’ Model Six, a basic two-way system named in honor of his original Model Six.

About Cambridge Soundworks...
Cambridge SoundWorks' Chairman was Henry Kloss, a name that will be familiar to anyone who has followed the hi-fi world with a knowledgeable background. Mr. Kloss was a speaker man all his life, being involved in Acoustic Research in its formative years, leaving that company to found KLH, then becoming the force behind Advent. He appeared to lose his way in the '80s when his company produced a projection TV system, but the appearance of Cambridge SoundWorks saw a return to his woofer-n-tweeter roots. The company's first product, a tiny satellite/dual subwoofer package called the Ensemble, along with a similar package from Bose, set the style for what became a bestselling "lifestyle" loudspeaker system . In addition, the notion of selling only direct to the public, with a 30-day money-back guarantee and a toll-free number where expert advice was always available proved a winner.  The Ambiance, Cambridge SoundWorks' second product, was a more conventional mini-monitor that resembled a slightly larger-scale version of the Ensemble satellite.

About Henry Kloss...
Henry Kloss, whose prolific hi-fi design and manufacturing career spanned a half century, died of a subdural hematoma on January 31, 2002, three weeks before his 73rd birthday.   Habitually clothed in khaki trousers and oxford cloth shirts, their button-down collars unbuttoned and sleeves rolled, Kloss (pronounced with a long o, to rhyme with "close") looked like someone familiar with tools. Indeed he was. As a boy, he was able to add rooms and bath fixtures to the Pennsylvania cabin he shared with his mother and two sisters.

After entering MIT in 1948, Kloss worked part-time for a contractor and bought woodworking tools to make furniture for his basement apartment. Instead, he used them to turn out enclosures for a speaker system an MIT professor and his student had designed. Henry dropped out of MIT after being drafted. Stationed in New Jersey, he took a New York University night course in high fidelity taught by Edgar Villchur, who had conceived a radically new type of loudspeaker.

In 1954, Villchur and Kloss founded Acoustic Research to develop and produce it. Henry provided the facility, a cabinet and speaker-assembly shop he was already operating in a Harvard Square loft. Two other partners, Malcolm Low and J. Anton Hofmann, son of the great pianist Josef Hofmann, supplied $5000 in capital. That led to the AR-1, the world's first acoustic-suspension loudspeaker system, with its relatively small enclosure and proportionally prodigious bass.  But Villchur remained home in Woodstock, New York, while Kloss ran the Massachusetts factory. That caused friction, leading Kloss, Low and Hofmann to break away and put their initials on a new firm. In 1957, they founded KLH.

In 1967, after producing more landmarks, including the KLH Model Six speaker, the fine-sounding Model Eight radio, and a hi-fi system in a suitcase designated Model Eleven, he started Advent to work on projection television. The speakers he built to fund that effort quickly became best-sellers.
Henry Kloss embraced innovation. He was quick to employ the transistor, which was crucial to the KLH Eleven's portability, and he ingeniously combined previously unrelated concepts with two Advent firsts: a cassette deck featuring Dolby noise reduction (which he had prodded Ray Dolby to adapt for consumers) and chromium dioxide cassettes. That synergy made the medium truly music worthy.

Yet Kloss was genuinely modest about such achievements.  He once said "Some of the particular things I have done...could have and should have been done before,

After leaving Advent, Henry started Kloss Video and, in 1988, co-founded Cambridge SoundWorks, for which he designed some three dozen products. His newest radios, marketed by Tivoli Audio, have the simple, signature look of his KLH models, even down to their planetary dials.
Kloss, informed by his own muse and unimpressed by fashion, created boldly original, straightforward, utilitarian products that lowered the price of performance. Longevity was another criterion, in what he built and what he bought. When he retired his second Checker automobile after 14 years of use, Henry vowed to drive his new Mercedes diesel for 20.  He owned it to the end, 17 years in all. For the many people who so admired Henry Kloss, that wasn't long enough.

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(2005)   $850

In excellent cosmetic condition and fully operational, this pair of Monitor Audio Silver RS8 speakers were obtained from the original owner.

The British firm Monitor Audio is known for building loudspeakers based on exotic metal-alloy drivers, and for some years Monitor’s Silver S models have been quite successful in the marketplace.

At CES 2005 the company announced a new Silver RS-series intended to take “the performance of the award-winning Silver S range to the next level.” The flagship of the new line is the Silver RS8—a two and a half-way, bassreflex, tower-type speaker. I found myself mesmerized by the review samples’ gorgeous “Rosenut” enclosures, and by their driver array: a 1″ gold-dome C-CAM (Ceramic-Coated Aluminum Magnesium alloy) tweeter, a 6″ C-CAM mid/bass driver, and two 6″ C-CAM woofers. The drivers are mounted in non-metallic cast-polymer frames whose matte silver matches the appearance of the speaker diaphragms. 

First, the RS8s offer unusually extended frequency response, with bass that reaches down into the midto- low 30Hz range and treble that extends beyond audibility. They also have quite good driver integration, with crossover points for the most part seamless. They, along with other affordable new near-full-range speakers such as Revel’s Concerta F12s, dispel the myth that full-range sound has to cost the earth. Second, the RS8s offer spacious imaging (though traces of treble “zing” occasionally peek through) with good image height and width. They also produce deep soundstages that consistently draw favorable comments from guest listeners.

Third, the RS8s are easy to drive, and so work well with moderately powered, moderately priced electronics. They also sound dynamically alive, so you may find yourself playing them at higher volumes than you would (or could) with most competing speakers. The RS8s are downright happy playing ebullient jazz and rock material; they did a fantastic job of capturing the exuberant, punchy sound of “Vertigo” from U2’s How to Dismantle an Atomic Bomb [Interscope].

Finally, the RS8s possess an updated interpretation of the Monitor Audio “house sound,” which emphasizes bright (but not painfully bright) well-defined treble response, a lively yet smooth-sounding midrange, and hearty, robust bass. It’s this sound, which— more than any other single characteristic—defines the RS8s. If you believe the stereotype that all British speakers sound “polite” or “subdued,” the Silver RS8s will change your mind—they love to boogie.

Specs:
System Format: 3 Way
Frequency Response: 32Hz - 35kHzSensitivity (1W@1M): 90dB
Nominal Impedance: 4 Ohms
Maximum SPL: 116.8 (pair)
Power Handling (RMS): 200 watts
Recommended Amp: 80 - 200 watts
Bass reflex: Twin HiVe®II port System
Crossover Frequency: LF/MF: 500Hz / MF/HF:2.7kHz
Drive Unit Complement:
~Two 6" RST Bass drivers.
~One 4" RST Mid-range driver.
~One 1"  C-CAM Gold dome tweeter
Dimensions 40"H x 7.5"W x 12"D
Weight: 52 lbs each

About Monitor Audio...
Monitor Audio was founded by Mo Iqbal in Teversham, near Cambridge, England, in 1972.  Back in 2022 it marked the brand’s 50th year.  Mr Iqbal is no longer with Monitor—he sold the company to a group of audiophiles in 1997. That group grew the hi-fi loudspeaker company into the global powerhouse brand it is today, which has branched out into the home-theater and custom-install markets as well.

By all accounts, Monitor Audio is a success—and one with a lengthy history, at that. The Monitor Audio headquarters is located in Rayleigh, Essex and the company has continued to expand. 

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(1987)   $500

Praised by Stereo Review in 1985 and incredibly hard to find (especially in such splendid cosmetic condition), this pair of the Siefert Research Maxim III is best described as the original configuration as designed by Dan Siefert (see his history below) of a two-way, compact system featuring 40-Hz resonance woofers, low IM distortion, low group delay and with high power handling capability.
*NOTE: in July 1985, Stereophile magazine's globally respected audiophile personality, J Gordon Holt reviewed the Maxim III speakers and claimed they were highly recommended.  See the review below 

The enclosures:
Essentially a 2-way system, these front-ported, real walnut finish, tuned-bass reflex enclosures (with radius edges) are based on the special relationship 4:5:6, which minimizes internal nodal reflections. Remarkably solid, 3/4" particle wood and high density fiberboard, plus rigid internal bracing. The narrow baffles provide excellent dispersion and enhanced imaging. They have sequential serial numbers for a matched pair.The drivers:
~Specially designed Dynaudio 6.5" woofers (18 oz ferrite magnets, 1.25" voice coils) feature ultra-compliant butyl surrounds combined with polypropylene cones containing proprietary inert damping compound that makes them twice as thick as most woofer cones.~The 1" SEAS dome tweeters feature 8.7 oz ferrite magnets

The crossover network:
~3.3 kHz, conjugate-compensated, first order, minimum phase
~Frequency response: 46 Hz ~ 22kHz...8 ohms...power handling up to 250 watts...
~Sensitivity 86 dB @ 1 watt...size (ea) 13" H x 9" W x 11 "D...18 lbs (ea)Finally, the Maxim III is a true high quality speaker system that were 100% made in the USA. They easily rival the quality of famous Italian / German / American speakers like Sonus Faber, Visonik, Braun, ADS, B&W, etc. 

The story:
Several years ago, we came across a pair of unknown (at the time) Siefert Research speakers. We were intrigued enough with the design and sound to jump online and (eventually) track down the designer, Dan Siefert. *(see bio below). He was kind enough to reply with a wealth of inside information way beyond what was available online. He recommended looking for a pair of Maxim III. He also sent us a package with original spec sheets, sales sheets and technical design information about the Maxim lineup. 

*Stereophile magazine review 1985:
"There are very few loudspeaker systems of any price that don't make a critical listener accurately unhappy when he or she returns from a live concert to put on a recording. The Maxim is, amazingly, one that doesn't. In fact, of all the speakers in this price class that I have heard. I would say that Siefert's Maxim III is probably the most successful design of all. Mated with a suitable power amplifier, and not pushed too high a listening level, it is one of a small handful of moderately priced speaker systems that can make most audiophiles (and practically all music lovers) quite happy for an indefinite period of time. Recommended."~J. Gordon Holt (Stereophile magazine July 1985)Read more at https://www.stereophile.com/.../siefert-maxim-iii...

About Siefert Research...
Dan Siefert began his engineering career in 1975 at Great American Sound Company, designing high-end solid-state audio pre-amplifiers and power amplifiers.In 1983, Dan founded Siefert Research in Los Angeles, designing, manufacturing and marketing high performance loudspeakers...not through dealers but directly to customers.In 1986, he joined Harman International Industries, Inc . as a Senior Systems Design Engineer.While at Harman, Dan brought several speakers to market for professional, consumer and computer/multi-media applications. He was assigned to the Research and Development department, reporting to Dr. Floyd Toole. Dan then focused his attention on measurement technologies and contributed to the development of Harman's advanced subjective and objective measurement techniques.In 1996, he founded One on One Technical Products, Inc. and currently in 2018, as CEO, providing engineering services to the Consumer Electronics Industry. He is a member of the Audio Engineering Society (AES), the Acoustical Society of America (ASA) and the Custom Electronics Design and Installation Association (CEDIA). Dan is also a certified THX Home Theater Products developer.

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