Hello Guys .
I have a three way active system , with a esp P3A driving my tweeters so
my question is using a class A amp for my tweeters could makes any noticeable difference?
Thanks
I have a three way active system , with a esp P3A driving my tweeters so
my question is using a class A amp for my tweeters could makes any noticeable difference?
Thanks
For me, yes (it depends on your ears). With P3A you just need to change the transformer and bias higher into class-A of P3B.
Diffrence in class a and class ab, mainly is the biasing, with class ab its bised to be just turned on. Thats great, low power consumption for same or simullar perofmrance.
But once you put music into it, for example a sine wave, theres the top upper postive and bottom negative swing, with a 1HZ sine wave, the npn will be turned on for 0.5 secs and pnp will be turned on for 0.5 secs when the npns are turned off.
Heres the concern, as npns and turned off and pnps turn on(Not excatly tunred off but one side has a higher biasing), it creates distoriton. It not only creates distortion but also changes the dc voltage at speaker, it will varry more, not zero volts any more.
with class a, since its biased to maximum or near maximum, all devices are turned on no matter what you do, and turned on with the same ammount of current voltage.
Therfore has less distortion and more stable dc voltage at speaker and has better sound
But once you put music into it, for example a sine wave, theres the top upper postive and bottom negative swing, with a 1HZ sine wave, the npn will be turned on for 0.5 secs and pnp will be turned on for 0.5 secs when the npns are turned off.
Heres the concern, as npns and turned off and pnps turn on(Not excatly tunred off but one side has a higher biasing), it creates distoriton. It not only creates distortion but also changes the dc voltage at speaker, it will varry more, not zero volts any more.
with class a, since its biased to maximum or near maximum, all devices are turned on no matter what you do, and turned on with the same ammount of current voltage.
Therfore has less distortion and more stable dc voltage at speaker and has better sound
Thanks guys , I'm trying to convince myself to not to build another amp.
I have the pcbs to a pass F5. please someone with a argument against.
🙂
I have the pcbs to a pass F5. please someone with a argument against.
🙂
Much much better, important! to array, is:
- se
- pp
- complementary-pp
and
- balanced
- unbalanced
and
- not (much) complex
- more complex
and more,-)
And: Do not use x-amping,-)
- se
- pp
- complementary-pp
and
- balanced
- unbalanced
and
- not (much) complex
- more complex
and more,-)
And: Do not use x-amping,-)
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The question is: What kind of driver efficiencies are we talking about?
It is often assumed that you can get away with much smaller power for the tweeter vs. the woofer (and hence Class A etc.), but that requires a typical setup where the tweeter might be at >100 dB/W/m and the woofer at <90. If all of them are about equal, surprisingly large peak power headroom may be required in the tweeter amp for accurate reproduction of certain transients (e.g. snare hit).
It does make sense to have a "nice" tweeter amp, with low crossover distortion. The bass amp can be almost anything assuming it has enough "grunt" and low output impedance.
I recommend looking up P3A discussion on recommended transistor types and biasing, e.g. here.
It is often assumed that you can get away with much smaller power for the tweeter vs. the woofer (and hence Class A etc.), but that requires a typical setup where the tweeter might be at >100 dB/W/m and the woofer at <90. If all of them are about equal, surprisingly large peak power headroom may be required in the tweeter amp for accurate reproduction of certain transients (e.g. snare hit).
It does make sense to have a "nice" tweeter amp, with low crossover distortion. The bass amp can be almost anything assuming it has enough "grunt" and low output impedance.
I recommend looking up P3A discussion on recommended transistor types and biasing, e.g. here.
Personally I cant tell the difference.
In class AB both transistors are always on so they are in class a anyway.
Feedback takes care of any over lap in turning on between npn and pnp.
In class AB both transistors are always on so they are in class a anyway.
Feedback takes care of any over lap in turning on between npn and pnp.
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