Mac 275 questions........

Rick, first I want to add some information about the new 275's you may not have encountered:
The two latest MC275's have 490V (vs. 420V) power transformers. They put out almost 90w/ch (180 mono) even with the stock power tubes. With the better current manufacture tubes (PentaLabs, 'new' Gold Lions) it's more like 95w/ch. And even higher with vintage tubes from the GEC family -- which even lightly used, have transconductance values upwards from 9500 mMHOs!

Second, the few (but real) attributes you noted using two amps, are largely due to having a separate (and huge) power supply for each channel. If you were driving full-range speakers, you'd notice improved bass control immediately.

And last, every hour that goes by using the stock tubes is an hour of audio bliss wasted. You can't know this now of course, but the sooner you put in some decent tubes, the less you'll be kicking yourself later ;-) Any any sonic evaluations you might make now, no matter how well intended, you'll have to completely scrap later on, so why delay the inevitable?
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OK all you technicians and amp designers a question. I am here sitting and listening to "Mallets, Melody & Mayhem" a great percussion record (thanks to the great Sid Marks) and I am hearing stupendous bass from my woofer towers now that I have my new Mac 275's running. This is better then when I had the ASL Hurricanes. My question is the Hurricanes and the Mac's are only driving the top end of my Infinity's not the bass columns??? Is it really a sensitivity issue?

Any answers or suggestions as to why the beautiful bass is back in full swing?

Anyone? No one to answer? Sorry if my question is confussing. Perhaps I should try a new Thread. This is an interesting question. No?

"With new amps on the top end of my system (Infinity RS1-B's) I am getting more and better bass from my system then with my ASL Hurricans. However, my bass columns are being driven by a Perreaux 3150B amp that's still in the system. How can an amp on the top affect the sound of the lower range???"

Rick, I won't speak for the others, but I don't understand what you've got running what ;-) Are you running the 275 on the main panelsand the (what?) driving the woofer towers? And you want to know why that should result in (apparently) better bass performance than when you were driving the mailn panels with the ASL's?

Correct, Neil.

How can a change in amps (McIntosh 275 vs ASL Hurricanes) result in a dramatic improvement in the bass when they are not even driving the bass columns. It's a Perreaux 3150B that's assigned to that duty. Someone suggest the sensitivity of the top and bottom amps were not matched. But I just don't get it?