The Aleph-X

[jarek]

Thanks for reply,

IRFP044N are twice cheaper then IRFP044. According to the parameters IRFP044N would be use, but what about sonic inflluence?

[yldouright]

Jarek

Before you make your decision, read what our moderator AudioFreak had to say about this issue here, here and here. Actually, he makes even stronger statements here and here. Email me privately and I'll discuss the issue with you.

[MikeW]

I think there are other factor that influence the sound more than the the IRFP's you pick. The bias for one. I have used IRFP 064n, IRFP 044n, IRFP 048n, IRFP 140n, IRFP 250, IRFP240, and IRFP 254. They all sound good.

Peter, I you sure they are 8 ohm speakers?

[stefanobilliani]

Originally posted by Peter Daniel
So what sort of rails are you planning on in your monoblocks?

In comparison with the sound of Zen V2 vith 40V rail I'm planning for a +/- 25 volt.

Bias or not I like voltage, like mosfets

[grataku]

Originally posted by Peter Daniel
So what sort of rails are you planning on in your monoblocks?

I am even higher than Stefano, I'll use 30-0-30. Sort of a double aleph 2 with a total of 24 mosfets/chn I am thinking a 1 ohms for the resistors (maybe 0.75 if I feel like pushing it) ~6 amps/chn, 4 r-theta heatsinks/chn should allow for 360W dissipation maybe 400W. That should give a super clean 100W/8ohms which is more than I'll ever need.

Stefano thinks like I do on this one. I think it's better to lower power expectation into lower impedance loads than it is to run out of voltage margin.

[grataku]

The mosfets with odd suffix number like 150 or 054 or that contain the letter N are not recommended, don't ask me why, I don't remember, there was extensive discussion here months ago.

[Peter Daniel]

I don't know why, but I was always under the impression that the rails voltage level dictates the power level, but obviously this is not the case. Does it mean that one can actually choose any power level without caring much about how high are the rails? (I mean here higher rails than required). Why everybody was so much concerned with 12 V rails in the beginning of the thread?

[MikeW]

Why would Mr. Pass pick a IRFP 044n for the Zen-V4 ?

[Bricolo]

Originally posted by Peter Daniel
I don't know why, but I was always under the impression that the rails voltage level dictates the power level, but obviously this is not the case. Does it mean that one can actually choose any power level without caring much about how high are the rails? (I mean here higher rails than required). Why everybody was so much concerned with 12 V rails in the beginning of the thread?

you're right!
+-12V rails means 72W max on 8R, and 144W max on 4R (with high enouth bias, of course)
maybe slightly less, cauz you can never output as much voltage as the poser supply rails, but it's still enough power woth 12V rails

[grataku]

Originally posted by Peter Daniel
I don't know why, but I was always under the impression that the rails voltage level dictates the power level, but obviously this is not the case. Does it mean that one can actually choose any power level without caring much about how high are the rails? (I mean here higher rails than required). Why everybody was so much concerned with 12 V rails in the beginning of the thread?

I don't see how anything that was said here violates that sacred principle.