I was looking for a better vibration damping material than the two neoprene rubber pads supplied with the Avel-Lindberg transformer. F1nut suggested I try Dynamat Extreme and offered to send me some. Thanks F1.
Dynamat Extreme panels were applied to all six sides of the Dreadnought's case, to the top of the transformer retaining ring, and between the transformer and the wood brace block. The brace block is there to provide additional support because the transformer enclosure rests on that side (see figure 23). Per the manufacturer's advice, the transformer's retaining bolt was hand tightened to avoid the possibility of over tightening. Overtightened with a wrench could damage the coil insulation and cause a short.
The Dynamat Xtreme didn't make a big difference, but the difference wasn't subtle either. I'd compare it to tightening down the very last 1/4 turn on an already tight bolt:
1. The pace of the music was a little faster.
2. Bass was a little tighter, heavier, and more defined.
The larger Dynamat pieces were cut on the underside of a small 2' x 2' wooden drafting table. A drafting t-square was used for a guide and cuts were made with a box cutter. Smaller pieces were cut with a very sharp pair of scissors.
My Polk original AI-1 arrived today. I listened to it for 30 seconds then had to apply the baked potato tweak. I managed to hang in for a little over an hour before I had to go back to the Dreadnought.
I just wanted one for my treasure chest of SDA artifacts...and to have one for comparison purposes when I decide to mass produce the Dreadnought.
http://i148.photobucket.com/albums/s...Devils/mad.gifCalm down. Don't get excited. He's just kidding about mass producing that thing.
Transformer shipped on Tuesday,,, should have it in operation by next weekend if all goes as planned,, will be driving 2.3 tl's with mono's,,hopefully.Thanks again DK, for the informative post.
Thanks Bro but Ray's work is perfect.
So Face, are you going to build me one? I'll buy you a liter of cola :D
If he'll build you one for a liter of cola, I'll give him two liters to build me one too.:)
What cheapskates, I'll buy him a couple of cases.
Here is my latest incarnation of the Avel Isolation Transformer. I am holding out for scraps of 20 oz. copper for the "final" stage.
A few pictures.
Eh, I've got some catching up to do.
I'm just seeing this for the first time, and once again am humbled by DK's work! One question I have: if this offers the sonic improvements over using the grounding strap and a straight sda connection by isolating the sda signal from the amp's ground, is there any reason why this application should be limited to non-common ground amps? Or would using a setup like this be applicable in all sda installations (capable of using the AI-1), even with common ground amps where the normal sda connection works just fine?
I don't know of a reason why an AI-1 couldn't be used with a common ground amp.
I'm just wondering if a steroidal AI-1 assembly like you've built would offer sonic improvements in all applications, regardless of whether the amp is common ground or not.
I was going to say terroidal, but steroidal just sounded so much better :)
DarqueNight, any links on where to get the transformer? I asked PartsExpress for a price on the Y236906 since they sell Avel, but it's a special order for them and they're quoting $130.08 plus shipping. Also, do you have a link to where the enclosure can be purchased?
Avel Lindberg direct,, just call em and they'll take it from there
I got my case from parts express,,, matter of fact,, I'll be putting mine up FS soon,,as I don't need it,, good luck.
Thanks! Been talking to George offline though, I may be grabbing his whole assembly.
I made a request to DarqueKnight for his assistance in building the dreadnaught or building one for me. He recommended that I contact ben62670, and George Daniels.
I tried contacting Ben, however, he cannot receive anymore private emails. I have a pair of Polk SDA 2.3s and presently drive them with a Pioneer Amp. However, I have a HT rig with a Cinenova Grande 5 for an AMP. I want to drive my 2.3s using the Cinenova but have no A-1 transformer. Hence I need a Dreadnaught to resolve my problem.
Ben and/or George, please contact me at firstname.lastname@example.org to discuss a build. Thanks for your time and consideration.
Ken Brown II