ESS AMT Monitor

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General information[contribute]

The ESS AMT Monitor is a ribbon speaker. It is part of the AMT series. It was manufactured from 1981 to unknown.

Jon Aaron (December 4, 2006): AMT MONITOR. One of the most sought after tower builds of ESS' floor-standing loudspeakers. Yet these are some of the most inconsistent builds ever produced by ESS. On some you will find a circa 1B AMT tweeter, with a foam-roll surround suspension and on others you will see a black-painted AMT atop these, circa 1C generation, with a rolled-cloth type suspension and a matching conical bass radiator, on the woofer-reflex compliment.

Michael Florn (January 24, 2009): Unless you are confusing the AMT Monitors with something else (Like the AMT 1B or AMT 1C) the Monitor has NO tweeter, but a Heil Air-Motion Transformer, and the "woofer" or Low Frequency Driver has a Styrene Butadiene Rubber surround. The passive Radiator is a Bextrene cone. I have seen approximately 500+ pairs of these and all were consistently made where I was. I am confused by your information?

jon aaron (April 23, 2009): I'm not confusing the MONITORS with any of the A/B/C/D variety. By utilizing the term "tweeter" i was simply suggesting the standard consumer nomenclature of the large AMT driver. Heil AMT Tweeter is how it is commonly referred to. The SBR suspended Bextrene low frequency drivers were another build that was incorporated into the 1C tower builds, and later dropped when the polypropylene cone was introduced. The Bextrene conical radiator was only coupled with that similarly rolled-edge suspension Bextrene woofer driver. A treated form in suspension utilized on the MONITORS only were not of SBR make-up. This was clearly the later of the revisions... the first being the pre-1C build where conical radiators were not yet in use. I assume to know the MONITOR tower was the only floor standing pair of speakers where the bextrene reflex system came into play, as other builds' suggest the 1/4" and 1/8" styrene disc taking over the 1/2" styrofoam disc in the 1B era. The stiff conical bass reflex and matching stiff outer suspension on the active low frequency driver allow these towers additional power handling while masking harmonic overmodulations, but at the cost of the "sweet-spot" fundamental bass tone normally associated with the sonics of a 12" driver.

Michael Florn (April 28, 2009): Hey, Thanks for the clarification. As you know, some threads leave a lot of room for discussion due to the various jargon used by the industry and various audiophiles. I happened to have sold ESS speakers back in the early 80's and still have a set of Studio Monitors; great speakers! I would say that by your reply, you too are very familiar with these speakers. By any chance have you ever used the crossover or bi-amped them, and if so, how was the sound? Thanks for your reply! For those reading this thread, be aware that manufacturers, audiophiles and various consumers use a variety of descriptions for the same product or composition of a product. Think of a pharmicist telling you that you have a virus, the doctor says you have influenza and you tell everyone you have the flu; sort of the same thing.

Steve Rawdon (April 5, 2010): Your posts are very interesting. I have owned a pair of AMT monitors since Dec 1980 and they still are sounding like new thanks to a recon job done late in 2004 on the woofers and passives. The original silver mylar diagprapms on the AMT's are still in use and sound great although I do have a replacement set as a spare which are identical. The best speakers I have ever owned ..They will probably outlive me! I use them in conjuction with a sub woofer by Tannoy..Its a long throw 15 inch 200w rms device which just adds additional low frquency boost to the overall sound. Steve Rawdon, Upper Hutt, New Zealand

Related models

The following models were also produced in the AMT series:

ESS AMT
ESS AMT-1
ESS AMT-1 Tower
ESS AMT-1-A
ESS AMT-1-A Monitor
ESS AMT-1-AB
ESS AMT-1-AM
ESS AMT-1-B
ESS AMT-1-C
ESS AMT-1-D
ESS AMT-10-B
ESS AMT-16
ESS AMT-2
ESS AMT-3 Monitor
ESS AMT-320
ESS AMT-330
ESS AMT-4
ESS AMT-5
ESS AMT-5-A
ESS AMT-6 Pro
ESS AMT-8
ESS AMT-8-H
ESS Heil Elite
ESS Tempest

Alternate names[contribute]

ESS Heil AMT Monitor

Refurbishing[contribute]

jon aaron (December 4, 2006): Again, rotted foam surrounds on the woofers plague
this loudspeaker.

Forum topics on the ESS AMT Monitor

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