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Acoustat Model 6 Restoration Project

24.123.202.210
Posted on February 24, 2015 at 08:10:50
Ferrstein
Audiophile

Posts: 163
Location: Beautiful, Sunny Cleveland, Ohio
Joined: June 10, 2003
 Hello, been a while since I posted on here. I've recently scored a pair of Model 6 Acoustats and thought I'd share some interface modifications I did to them. I usually listen to servo amps but I wanted to set these up for some solid state amps. I will be driving these with a pair of Crown Macro Reference amps, which should have enough power to drive 'em...

The mods I did to the interface are pretty standard - better capacitor bank before the HF transformer, better connectors, better wiring. I did come up with a novel idea for the bias supply that seems to be performing very well. The attached picture has some details that I hope are legible even if they are a bit of an eye chart.

Happy Listening!




 

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Full Wave Bias Supply Details, posted on February 24, 2015 at 08:12:12
Ferrstein
Audiophile

Posts: 163
Location: Beautiful, Sunny Cleveland, Ohio
Joined: June 10, 2003
 Here are some details and comments on the new bias supply...




 

Assembly Details, posted on February 24, 2015 at 08:13:33
Ferrstein
Audiophile

Posts: 163
Location: Beautiful, Sunny Cleveland, Ohio
Joined: June 10, 2003
 Some details on the bias supply installation. The speaker goes together pretty much as stock except for the power supply box that lives between the interfaces.




 

Looks cool!, posted on February 25, 2015 at 11:32:52
E-Stat
Audiophile

Posts: 37584
Joined: May 12, 2000
Contributor
  Since: April 5, 2002
 I've been an Acoustat enthusiast since I first heard them in '76.

I had the interfaces in my 1+1s modified by Roy Esposito, a former Acoustat engineer. He left the tweeter level in place, but offered a switchable bypass via what he calls the "air mod". Fuses are intact, but I may well bypass those too, in time. I had done that long ago with 2+2s I owned for over twenty years.

Any plans to provide a more rigid structure for the panels?

 

RE: Acoustat Model 6 Restoration Project, posted on February 26, 2015 at 08:26:29
pictureguy
Audiophile

Posts: 22597
Location: SoCal
Joined: October 19, 2008
 Neatness Counts!

Good work.
Too much is never enough

 

RE: Acoustat Model 6 Restoration Project, posted on February 28, 2015 at 16:26:38
AJ
Audiophile

Posts: 532
Joined: February 24, 2001
 Really nice work....

 

RE: Very nice, posted on March 1, 2015 at 22:09:12
benie
Audiophile

Posts: 1851
Location: Alberta, Canada
Joined: October 24, 2004
 Will you be comparing your modded servo amps in the future?

 

RE: Very nice, posted on March 2, 2015 at 06:27:32
Ferrstein
Audiophile

Posts: 163
Location: Beautiful, Sunny Cleveland, Ohio
Joined: June 10, 2003
 Comparing servos to interfaces really is apples and oranges. The Servos are better IMO, but this pair of speakers is installed in my living room and I chose to use interfaces because they (interfaces) can sound very, very good with the right amps.

If I were to categorize I would say that the interfaces CAN have better bass. With the Crown Macro Reference amps that I use, they belt out amazing tight and detailed bass. The servo amps are definitely no slouch in that department and IMO sound quite a bit better through the critical midrange. Both have a very detailed and 3-dimensional sound if they are set up correctly.

 

RE: Looks cool!, posted on March 2, 2015 at 06:35:43
Ferrstein
Audiophile

Posts: 163
Location: Beautiful, Sunny Cleveland, Ohio
Joined: June 10, 2003
 I don't have any current plans to reinforce the frames. I do tend to prefer the earlier Monitor series frames over these late frames. They held the panels a bit more solidly at the interface points. On the early frames the panels met at a mitered joint that was pretty thick. The later models used a 1x2 with a faceted face.

IME the Acoustats sound best if you isolate them a bit, especially on hardwood floors. I've always just let the frames resonate away. Trying to couple or drain the energy to the floor has always caused more problems than it solved in my rooms. I've never been on concrete floors so I might try then... but that won't be coming up for me as I'm not planning to move in the foreseeable future.

 

RE: Very nice, posted on March 8, 2015 at 13:26:33
benie
Audiophile

Posts: 1851
Location: Alberta, Canada
Joined: October 24, 2004
 I would love to hear a pair of Model 6 someday, your lucky to have such a nice setup.

My system is in storage, but when I built my new Hardwood frames for my model X, I use Acacia wood (Spelling ?) as an isolation base, it is a good tone wood.
When I designed the isolation base + speaker base, I designed the AURIOS roller balls right into the design. The speaker base is 33" X 23" and 2" thick of hard Maple.

I experiment quite a bit with the Org. X frames and preferred roller balls. I find they sound much more open with a lot more air.

Thanks to a few PM's to you a few years back.

Ken

 

RE: Very nice, posted on March 9, 2015 at 10:24:52
Ferrstein
Audiophile

Posts: 163
Location: Beautiful, Sunny Cleveland, Ohio
Joined: June 10, 2003



Glad you like the roller balls. I've stuck with them on my Monitor 3s, along with some further isolation as shown below. To my ear it makes the bass much deeper and less "lumpy".

I may try something like this on my 6s as well. I have 8-1/2' ceilings there so I do have some vertical room. The problem is coming up with rollers that can handle the weight. For my 3s I changed from the picture below to the Symposium HDSE 7075 system because it is rated for more weight. These 6s are getting heavy... about 200 pounds each IIRC. The older I get, the heavier they get!

 

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