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Ess amt 1b

Discussion in 'Speakers' started by Johnlw7, Aug 9, 2009.

  1. Johnlw7

    Johnlw7 Active Member

    Messages:
    157
    Location:
    Mountain Home,Arkansas
    After a long dry spell finally made a decent score on some speakers.Was a local moving sale and picked up a nice pair of ESS AMT 1B speakers.Spotted them walking up the driveway,my heart was pounding and I was hoping they had not been sold.The woofers and passives need refoamed.the tweeters are in excellent shape.From what i have read and been told they are great speakers.Anyone here have a pair.Would appreciate some info.
     

     

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  2. bobrown14

    bobrown14 Super Member

    Messages:
    2,476
    Location:
    Philadelphia, PA
    I have a pair of the AMT-1b (small b) bookshelf version bought original in 78 still sound good to me. I'm in the process of recapping them - the foam was re-done, pretty straight forward re-foam. 6 Ohm load...

    Good luck with yours. The tweets go for decent $$ on ebay.

    Cheers,
    Bob
     
  3. bolly

    bolly Lunatic Member

    Messages:
    16,552
    Location:
    CFB Borden
    I had AMT-1's similar but no passive, wicked sounding tweeters!!

    AND the Heils themselves are worth about $400bux on ebay!
     
  4. Arkay

    Arkay Lunatic Member

    Messages:
    19,966
    Location:
    Hong Kong
    Here is what you should do with these: Remove the AMT and place it on TOP of the speaker, so it becomes open-baffle. Mount a mid-range driver where the AMT was. Replace the crossover with a 3-way crossover, tuned to your midrange of choice, and letting the AMTs kick in at a higher frequency, NOT in the middle of the "human voice range". Your speaker will catapult to a whole new league of sound quality.

    Putting those AMTs inside the box to act as front-radiators only, was one of the stupidest things ESS ever did.

    I love those 1B bookshelf speakers, though: they go for significantly less $$ than the other models with the AMTs mounted on top, so when you are looking for AMT drivers, they are the best bargains around! You can remove the AMT and use it in another speaker (in my case, I'm collecting/saving them to make an AMT open-baffle line Array, with nine AMTs per side :D), and convert the remainder of the old bookshelf speakers into decent Econowaves! With luck, you can sell the Econowave creations for enough to get back your investment, and have the AMTs for free (or at least cheap). :banana:
     
  5. djnagle

    djnagle Lunatic Member

    Messages:
    12,016
    Location:
    Albuquerque, New Mexico
    I had the AMT 1B. I took the Heil and now use it on my main system as a super tweeter. Then I refirbed the cabs, refoamed the PR, turned them into eWaves, and sold them. Great speakers though. The only thing I don't like about them is that they are thin sounding in the midrange.

    If you go to the eWave thread and look at the first page for member project number 11
     
  6. Johnlw7

    Johnlw7 Active Member

    Messages:
    157
    Location:
    Mountain Home,Arkansas
    Just to be on the same page this is what they look like.got them for the price of a case of good beer.So the passive radiator is supposed to face you?I still have the styrofoam pieces.Do they still use that for the PR?I think I will try to restore them to original specs and see what happens.
     

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  7. djnagle

    djnagle Lunatic Member

    Messages:
    12,016
    Location:
    Albuquerque, New Mexico
    The PR faces backwards. You can get replacement PR from many places, like simply speakers or orange county speakers. When you get them, glue 4 quarters to the middle of the inside of the PR: that is the same weight as the wood block ESS used but does not come with the replacements.
     
  8. bobrown14

    bobrown14 Super Member

    Messages:
    2,476
    Location:
    Philadelphia, PA
    Yup those are the 1A or 1B model - I've got the boxed in version 1b (small 'b') as Arkey suggested my tweets are "boxed" in and not on top. Ah well....

    Still good and yours are good too.

    Cheers,
    Bob
     
  9. automojo

    automojo OurBandCouldBeYourLife Subscriber

    Messages:
    3,788
    Location:
    Cheeseland
    That was the weakness of the 2 way Heil design. The only ESS models I know that used a midrange were the PS 1220's, which I owned, and should have neve got rid of, and the AMT3's-which I just purchased recently.
    MAny ESS fans claim the AMT#'s are the best of the bunch do to 2 smaller driven (10") woofers, and the midrange driver, to let the Heil operate in it's best range.
    The PS 1220's were awesome speakers, the louder you played them, seamingly the cleaner the sounded-if the AMT#'s are close to those I will be happy.
    The PS 1220's used a 12" bextrine woofer and passive slab (no blockes or weights- the bass never sounded slow or disjointed as some claim with some ESS designs. They also used a smaller Heil-in a 12lb magnet structure.
    Perhaps the best route would have been to add a midrange similair to the AMT3's.
     
  10. wualta

    wualta permanently nonplussed cat Subscriber

    Messages:
    7,434
    Location:
    West Michigan USA
    The b in amt-1b doesn't stand for box or bookshelf. There's an amt-1b floorstander as well as an amt-1b bookshelf. Photos on request.

    They're great speakers, especially for their day (more than 30 years ago) and well worth restoring, but they do have quirks, which would take a longwinded pile of subtechnical blablabla to explain. Fortunately, there's a way to get around the quirks: listen to the speakers well away from any walls and make sure your ears face the woofers more or less on-axis. This may require raising the speakers on tables or blocks. Listen to anyone who tells you to add mass, preferably in the form of sheet metal (coins qualify), to the passive radiators to tune the box lower.

    After that you can re-line the cabinet, seal the woofer, deOxIT the controls, etc. etc. Easy stuff first.
     
  11. westend

    westend Audiopile

    Messages:
    10,204
    Location:
    Shorewood MN
    Hey DJ, I'm about to use the Heil as a super tweeter, also. I'm curious, what crossover point do you use for the Heil?
     

     

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  12. bobrown14

    bobrown14 Super Member

    Messages:
    2,476
    Location:
    Philadelphia, PA
    AMT-1b and an AMT-1B - those are 2 different speakers...which was why I suggested the "small b" above. OP posted a pick of what looks like a AMT-1A or 1B but not a "1b"

    Here's a pic of a 1b, Oh and BTW on the back of the crossover is printed: "AMT-1b BOOKSHELF"

    Mine have the bextrene woofers but I had bought a replacement a while back with I think a paper cone (in the pic), I've since replaced that one with a bextrene coned woofer.

    Cheers,
    Bob
     

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  13. djnagle

    djnagle Lunatic Member

    Messages:
    12,016
    Location:
    Albuquerque, New Mexico
    I am crossing at 5k from my 350hz Edgarhorns. I have an active xover and have set it from 4K to 9K but 5k seems to sound the best. Well out of the vocal range. They are the best tweeters I've ever heard. Good luck.
     
  14. westend

    westend Audiopile

    Messages:
    10,204
    Location:
    Shorewood MN
    Thanks, I recently heard the Edgarhorns for the first time. They were attached to JBL large format drivers (2441, maybe?). That might have been expensive (for me) intro to tractix horns. :D

    The Heil has augmented a few pairs of speaks over here and has always been a good performer.
     
  15. djnagle

    djnagle Lunatic Member

    Messages:
    12,016
    Location:
    Albuquerque, New Mexico
    Yep, I am using the JBL 2441 with Radian diaphragms.
     
  16. wualta

    wualta permanently nonplussed cat Subscriber

    Messages:
    7,434
    Location:
    West Michigan USA
    If you can find me an ESS speaker labeled amt-1B... let's just say I'll be very surprised. And so will a lot of other owners.
     

     

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  17. Shackman55

    Shackman55 AK Subscriber Subscriber

    Messages:
    1,606
    Location:
    Western NC
    I'm restoring a pair of the AMT-1 without the passive. refoaming was simple, now I am looking at recapping the crossover, any words of wisdom on this subject? Seem hard to get to. I have all of 20 beans into these so far.. SA find.
     
  18. Kayo8

    Kayo8 New Member

    Messages:
    14
    Hey folks. Nube to this site. Just bought a pair of ESS AMT 1b from a trusted, retired doctor for a song. And I can't sing! All looks very good, cabinets and even the foam surrounds. Planning to refurb. Haven't hooked them up yet but was hoping you could tell me what the heck I have! Haven't seen this driver configuration anywhere. I have suspicions based on my research but would appreciate being informed by those who know ESS. All refurb input welcomed.
     

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  19. SleeperSupra

    SleeperSupra Well-Known Member

    Messages:
    997
    5,000 ish.
     
    Last edited: Jul 25, 2017
  20. SleeperSupra

    SleeperSupra Well-Known Member

    Messages:
    997

    Looks custom to me. Have you opened it up to look inside the cabinet to see if the drivers are separated or share a common airspace?
     

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