2. amps-preamps
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Does this mean I need Pre Amp w/ AtmaSpheres?

System is GNSC modded Wadia 850 running into Goldmund amp driving Talon Audio Hawks. CD also drives directly 4 Entec subwoofers. I tried a pair of Atmasphere M60 amps w/ Zero autoformers earlier this year. With the subwoofers off, each amp had its own pros and cons. With the subs on, the system sprang to life with the Goldmund. The bass seemed better integrated and springy, and spaciousness was much more clearly portrayed. The Atmaspheres sounded a bit lifeless and dull. I did prefer the upper midrange of the atmaspheres. I'm wondering if this is due to my Wadia not being able to drive the amplifiers and subs, or is this just the nature of tubes vs. solid state? Should I give the Atmas another chance w/ a Pre? (It's a pain, because the dealer's far away).
honest1
rushton's avatar
rushton
2,430 posts
 
From your description, this sounds like a system synergy problem with the Wadia not able to drive the Atma-Spheres correctly when the subs are paralled to the Wadia output. It sounds an awful lot like you've created an impedance mismatch when the subs are in the chain. A preamp would solve that by buffering the output going the amps from the output going to the subs. Best way to know is to try it.

Overall, I would expect the Atma-Spheres to give a materially more satisfying musical experience into the Talons that the Goldmund. You might also consider checking with your Atma-Sphere dealer or the factory about the match of the Wadia's output impedance (without the subs in the loop) to the the Atma-Sphere amps. Ralph Karsten would probably be pretty responsive to your questions. You can contact him through the contact information provided at his company, Rendition Audio (http://www.renditionaudio.com) since the Atma-Sphere web site is currently being moved to a new server.
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jtinn
1,123 posts
 
The Atma-sphere's do not have enough power to drive the Talons. Nothing more than that.
honest1 OP
572 posts
 
I emailed Glacier audio, who said the input impedance of the M60s is 100KOhms, which seems high (which I think makes them easy to drive), but not sure.
philefreak
416 posts
 
run your subs off the amp terminals instead of the other outs on the Wadia. You should run your subs this way no matter what amp you use.
ralphk
4 posts
 
Taking a look at the Talon website, the Hawk looks like an easy load for a tube amp, which is typical of other Talons. The efficiency is 89db, so if you have a larger room there could be a power issue, but if the subwoofer section crosses over the amplifier signal this probably is not a big deal.

This speaker does not seem to require the use of the ZERO either. If you are using the ZERO (and if the speaker matches the specs on the Talon website) then you may have indeed experienced a lifeless quality as the ZERO may not have been all that helpful.

If I were you, I would try different speaker cables to help optimize things, as the cable that is right for the Goldmund is likely not the one that will be optimal with the M-60, or any tube amp. I would say that you would be very lucky if the foregoing were not true!

Good luck and remember to have fun.
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