One is working perfectly! I refoamed the midrange, splicing a 6 1/2" foam down to 6". The tweeter on that one worked outside the enclosure, and the reason it and the mid didn't work inside was simply a blown fuse. I'm now one more midrange refoam and one tweeter diaphragm away from hearing these magnificent beasts in stereo.
I own a pair of ESS AMT-3 Rock Monitors bought new in 1974. They have been in storage in the original boxes at my parent's house since 1979. Do you a good speaker repair person who can fix these up to be like new. The woofers and mid's need to be re-foamed. I don't know about the AMT's, but they appear to be okay upon visual inspection. I am looking forward to seeing pics of yours.
ReplyDelete-Joe in Houston-
I am the proud original owner of a pair of ESS AMT 3 Rock Monitors that I purchased new in 1975. I replaced the woofers last year and reconed the mids at the same time. The Heil Air Motion Transformers still perform perfectly. These speakers work best with a high performance, separate preamplifier and high current, high power amplifier.
ReplyDeleteRegards,
Tom in New Mexico
I bought a pair of Rock Monitors upon graduating High School in 1976. Great loud speaker, with superior highs, great mids and so-so lows. I am still using them in my theater. There are many sources of re-foam kits online and it brings them back to new. The Heil's still sound like new after all these years. I would still be using them in my main system if I was not fortunate enough to find some Infinity IRS Beta's.
ReplyDeleteThe Dayton ST255-8 is a great upgrade for this speaker.
ReplyDeleteTo get the best out of the woofers, you really need to block the stock port, and use 2 3"x6" ports on the rear.
These speaker, so upgraded will blow away 95% of speakers out there-new or old.
Take a look at Audio Karma, for suitable woofer replacements. I used the now discontinued 1040sf woofers from orange county speaker-and completely sealed the cabinet.
ReplyDeleteAdded braces between the woofer openings/between the midtube and upper woofer. Foam lined the interior, and 4" foam on the back panel.
The lows are superb, detailed and highly dynamic like the rest of the speaker.
In fact, now, with the mods, it's one of the most natural sounding, musical speakers I have ever heard-at any price-hard to believe!!
You can also try-if you have the larger mid tube, and Alpha 6a for the mid-add a 8 ohm l-pad-and roughly adjust it midway-for a more detailed mid-although the stock unit is works great if not damaged.