Stereo Speaker Systems #3

Siefert Research Maxim III(H)
Siefert Research Maxim III(H)
Siefert Research Maxim III(H)
Siefert Research Maxim III(H)

Siefert Research Maxim III-H (hybrid) (1987)  $500  (rare, mint)

The Maxim III-H (hybrid) is best described as the last and best configuration (as designed by *Dan Siefert) of a two-way, compact system featuring 40-Hz resonance woofers, low IM distortion, low group delay and with high power handling capability.


The enclosures:

Essentially a 2-way system, these front-ported, black-lacquered grained oak, 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 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 tweeters (8.7 oz ferrite magnets) are 1" special aluminum domes with polyamide surrounds, this upgraded tweeter design makes them hybrid, or, the "H" model. (see Dan's technical explanation below)


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-H (Hybrid) is true high quality system, 100% made in USA and rivaling the quality of famous German speakers like Visonik, Braun, ADS, etc.  Additional original technical spec sheets, original brochure and more are included with purchase.


The story:

A few years ago, we came across a pair of unknown (at the time) Siefert Research speakers that were not like these Maxim III(H).  We were intrigued enough with the design and sound to 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.  Recently in December 2018, after finally finding a mint pair of Maxim III(H), we contacted him again in regards to what the "H" meant on these Maxim III(H) speakers.

Dan's reply:

"(With the Maxim III-H) you have what I consider the best series of Maxims. The "H" stands for hybrid. Looking at the tweeter you will notice that the dome is aluminum but the surround (outer edge) is not. 99.9% of all dome tweeters are a single piece construction. So, if you have an aluminum dome (high stiffness), the surround would also be aluminum. Aluminum makes a great diaphragm but a lousy surround (where you want high compliance, not high stiffness). In the 1980's there were almost no hybrid construction tweeters. Today they are somewhat more common. Bottom line: the hybrid tweeter combined the high stiffness of an aluminum dome with the high compliance of a polyamide surround! Making a very good speaker even better."


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/content/siefert-maxim-iii-loudspeaker#0XdB2rFec7Hm9WD9.99


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 direct to customer.

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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Allied 3005A

Allied 3005A (1968)  $200


These one-owner (purchased new in '68) Allied Radio 3005A large bookshelf sized speakers are of the highest quality that was attainable in the late 60's and are considered very rare.

To most folks, the name Allied is not well known but, because the drivers inside the 3005A consist of Alnico components, these should be considered a vintage "higher end" product of the late 60's era...all-American made in Chicago IL.  

The 3005A is a 3-way ducted port system featuring 10"  woofers with 6.8 oz Alnico V magnets and 1" voice coils, 6" midrange with 3.16 oz magnets and 3.5" tweeters with 1.47 oz magnets.

The oiled walnut real wood veneer cabinets feature fine vintage cane fabric grills.  The cabinets were built to be sturdy with 3/4" wood paneling and lined inside with thick acoustical baffling.  

Rated at 8 ohms and nominal power of 20 watts (40 watts max) they are very efficient.

Although originally designed for horizontal use they can, of course, be placed vertically as well.  For the sake of comparison (and because, in the late 60's, Allied Radio also sold Utah drivers, Electro-Voice and even Wharfedale components) these 3005A are similar to the Knight 3005 speakers (also sold by Allied).  In many cases, Allied would sell Utah drivers as suitable replacements for their own branded speaker systems.


About Allied Radio...

Allied Radio (now referred to as Allied Electronics) is a company with a long history. On August 6, 1928, the company was started by Chicago industrialist Simon "Sy" Wexler when he was only 31 years old. Simon Wexler associated with noteworthy entrepreneurs.  

Simon, Jay Pritzker (founder of the Hyatt Hotel chain), and industrialist Henry Crown rode the train weekly from Chicago to New York when Henry Crown was building the Empire State Building. Simon Wexler was also remembered as a philanthropist who even had the mental health clinic named after him at Michael Reese Hospital.  

Similar in size and distribution to Radio Shack, at one time they were serious competitors and commanded a healthy chunk of the electronics business in the USA.

Allied's main competitors were Radio Shack, Lafayette Radio, Olson Electronics, Newark Electronics, Burstein-Applebee Co., and local independent dealers (such as WinterRadio). Allied's primary house brands included "Allied", "Knight", and "Knight-Kit".

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Epi T/E 100+

Epicure Time/Energy 100+ ('82-'87)  $175


Rarely seen, these 2-way Epicure Time/Energy 100+ speakers are one of the models that was considered a major revamp of the EPI product line for the '80s. 

The 8" woofer cones are made of Lexan, with the foam from the surround extended and laminated behind them.  These also have new foam surrounds.

The 1" "blue ring" tweeters in combination with the 8" drivers in the EPI baffled enclosures are known for their crystal clear highs and the bass is as solid as can be for a great speaker system.

Rated at 15 to 90 watts power handling, they sound great with almost any power source.  

The walnut cabinets and grills are near perfect.


About Epicure (Epi)...
EPI was founded in 1970 by Winslow Burhoe, to manufacture speakers based on the "module" he had designed. This module consisted of an eight inch woofer and a one inch tweeter. Many different speakers were built using various combinations of this module, and a six inch version of the woofer. They were wonderful speakers and are still usually prized by their owners, who will frequently go to great lengths to repair them properly when they (rarely) develop problems.


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Genesis FLS G1+

Genesis FLS G1+ (1978)  $175


The 8 ohm, Genesis FLS GI+ system is an eight-inch two-way system with beautiful rosewood veneer enclosures.
The woofers have new foam surrounds and yield a deep and satisfying bottom end.

The 1" concave dome tweeters are set behind metal mesh protective covers and were specially designed for Genesis.  

There is a cult following on the Genesis speakers and they are rare.  

These are in excellent condition and sound just great!  It might be risky to say but, these rival the ADS L520 in overall quality of sound.

The cabinets and grills are near perfect.

Genesis Physics Corporation built speakers for Fred Locke Stereo (FLS) to sell as a "house brand" in the 70's but they are identical to certain Genesis products.FLS was a boutique HiFi shop in the Northeast USA that catered to audiophiles and others looking for more than the usual mainstream stereo gear.


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