There's a nice product called "First Watt" by NP and I agree that importance of low distortion especially for and even for very low power is usually underestimated. This is the reason why most AB amplifiers sound bad though measure good - when measured at higher power. I agree that the first watt is importatnt and I attach 20mW spectrum of my error correction amp (inspired by NP). Please forget the baseline curls, which are the soundcard problem. I would greatly appreciate to see similar measurement of the "FirstWatt" amplifier.
Attachments
Sound decay and reverberations are examples of such levels.Upupa Epops said:20 mW is silent night listening , what do you can listen by this level ?
I know, my english is uglyUpupa Epops said:Which sound decay do you mean ?
A sound's life has different stages. Roughly speaking, they are: attack-suspend-decay. With my new amp this life is noticeable longer
PMA said:....importance of low distortion especially for and even for very low power is usually underestimated....
True... ...
...which is why i prefer Class-AB to Self's so-called optimal Class-B...
I'd say this way:ACD said:Anli:
The low distortion of the low level signales will be "killed" by the distortion of the main signals
"The low level signals will be "killed" by the distortion of the main signals"
PMA said:Better to compare 2 designs, with similar distortion for higher power (order of watts and more), and differing in low-level distortion (order of 10mW, 100mW). Try it
one way to do that is to compare an amp working in AB/B (with bias) and the same amp working in C (without bias).
Either Self or Douglas mentioned somewhere that in a Class C, the cross-over distortion doesnot go up when output power goes down - totally counter-intuitive and I am not sure if I will buy off of that.
it shouldn't be that difficult to do, right?
Pavel,PMA said:I have already compared B, AB and AB with error correction. For me the question has been answered.
Have you rejected class A topology as a decision of first watt problem?
P.S. BTW, have you looked at my amp? Final (soldered) version is here: http://gaydenko.com/um/schematics18.png
anli said:
Pavel,
Have you rejected class A topology as a decision of first watt problem?
P.S. BTW, have you looked at my amp? Final (soldered) version is here: http://gaydenko.com/um/schematics18.png
No, I have not. The class A is superior, but a little bit hot when designed for higher power.
I have reviewed your ftp, very smart and interesting circuits. I apologize for lack of answering, unfurtunately been too busy in my regular job ...
anli said:
P.S. BTW, have you looked at my amp? Final (soldered) version is here: http://gaydenko.com/um/schematics18.png
Drastwuj Anli
maybe you will write about its sound; only sharp/detailed or soft/relaxing?
I'd say "detailed and relaxing" - it is balanced class A with very deep NFB (more than 90db in simulator).padamiecki said:Drastwuj Anli
maybe you will write about its sound; only sharp/detailed or soft/relaxing?
I have very simple criteria for amps: it is possible to listen at high level and during long time without tiredness even if it is a listening of symphony orchestra.
OTOH, I have not a big practice in listening of plenty of other amps with different topologies.
anli said:
I'd say "detailed and relaxing"
OK
do not you have a problems with dc-offset?
Only the hexfets are on the heatsinks?
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