I think I should add that both single-ended and push-pull designs can both be class-A biased. I personally believe that it is the single-ended, class-A designs that really deliver the ultimate high-end eargasm.
post #151 of 176
2/14/06 at 7:19pm
|Lastly, I want to say that Nelson Pass is one of my personal design heros. In understanding his designs you'll find that simply saying class A is the only way to go only presents a very small part of the picture.|
|I think I should add that both single-ended and push-pull designs can both be class-A biased. I personally believe that it is the single-ended, class-A designs that really deliver the ultimate high-end eargasm.|
Originally Posted by Firestarter
i can't help but to compare this to cooling a CPU, your Pentium 4, your AMD Athlon or whatever your running. some of these have thermal densities (watts dissipated per square inch) that sound awefully close to the 10W per pinky, yet they stay somewhat cool thanks to big copper coolers with fans on them. some are even watercooled
|There are in fact monolithic pure class A amplifiers out there.
Some of them in fact work great for headphones.
|I now completely disagree with this statement. I offer up the following
picture as proof that an all discrete module the same exact size as the
headroom module with crosfeed can in fact be built. In fact i've put
it on my todo list.
|Ah I see you also have found the virtues of dynamic biasing. Yes Mr. Pass is the man shall we now call Him Dr. Pass (Just kidding)|
|The Kenwood with BB2604 has the best focus of all three. It also has very good dynamic range for an opamp audio stage which I previosly thought was only a strength with discrete outputs.|
Originally Posted by rickcr42
hate to say "told you so" but..........OK I don't hate to say it."Told ya"
Nelson Pass IS the man but dynamic biasing is more means to an end than it is a better way on the sonic merits.i will take my "Zen Lite" over my "Aleph 3" knockoff hands down on the sonic merits.
The Zen series is mostly not a viably commercial topology being as inefficient and non PC as it gets (HUGE DC blocking cap) unless you go balanced and even DIY versions get pricey so consider how expensive an "commercially viable" Zen would be that satisfied not only actual listening tests but conventional "I want my PC audio" and pretty graphs as well ?
DIYers can get away with selling specialised gear,major manufacturers need to produce products that are plug an play hence the Aleph Series