Originally Posted by vulcan00
Jmouse A question for you:
Since you have the A51 and A23. Also you demo the A21. Have you ever compared the these amps sound when driving the two front speakers ( left and right fronts) in 2 ch stereo ?
Most would use the A21 to drive the front speakers. I am wondering if you have ever used two channels of the A51 to drive the fronts? Is there a clear difference in sound?
Having demoed the A21 and the A51, I found them exceptionally similar (that is why I went with the A51 over the A21. If they had not been I would have just gone with the A21 and looked elsewhere for powering my other channels).
As to how the A51 sounds in stereo mode only... my ONKYO 5507 has "Pure" and Stereo audio modes which only play sound through the L&R front mains (the "Pure" mode adds no processing at all... LOVE IT!). As a matter of fact, when playing CD's or records (remember those?) the A51 in Pure or Stereo sounds better than anything we have ever owned, bar none. Like I said; Lucas, Sony, Spielberg , WB, Universal etc... ALL OF THEM could buy ANYTHING they want to reproduce the audio for all of their movies in their studios and they have all chosen PARASOUND Halo power amps. Why? Because they are very accurate in reproducing sound.
Is the Halo A51 expensive, sure but it is a steal when you realize that it sounds as good if not better than power amps costing up to $30k (I know because I A/B demoed them, it was amazing how good they sounded compared to the competition). Apart from the Rogers Ls35a BBC monitors and Satterburg woofers I purchased almost 30 years ago, the Parasound Halo's are the best long-term audio investment we have made (they will be passed down to our kids once we are gone). To top it off, PARASOUND's customer service is nothing short of outstanding. They stand behind their products and they genuinely care about their customers and making sure their products perform flawlessly.
I could have gone with the A21 and A51 but the reality is I didn't need to because I don't need 250 watts per channel going into the front height ambient speakers... total over kill. So the A51 powers our L&R mains, center channel and side/surrounds (more effective than rears) and the A23 is dedicated to the front main heights.
One more thing re the A51 over the A21 in stereo mode. I believe the A51 may actually have more peak power available when playing stereo because it has the capacity to draw on power not being used by the other 3 channels. I could be wrong but I remember someone on the PARASOUND thread mentioning this quite a while ago.
I hope this helps in your decision making process.