Aiyima’s new balanced amplifier- A20

[Toni Mas]

@AIYIMA Does the high-pass filter act also as a low-pass filter for the sub out at the same time?
(so if I set the HPF to 80Hz, would the sub out have an LPF at 80Hz too?)

Otherwise one would need an additional low-pass filter and that would kind of kill the whole benefit of having a high-pass on the amp....

Mmmm... In a real room 2+2 is never 4, even accounting for phase or delays, which these device don't allow adjusting. Matching crossover points is far for beeing enough. Mismatches or overlapping might even help.

 

[Bruce Morgen]

@AIYIMA Does the high-pass filter act also as a low-pass filter for the sub out at the same time?
(so if I set the HPF to 80Hz, would the sub out have an LPF at 80Hz too?)

Otherwise one would need an additional low-pass filter and that would kind of kill the whole benefit of having a high-pass on the amp....

Not exactly. Low pass is built into the vast majority of subwoofers, but many -- perhaps most -- recent subwoofer designs don't provide a high pass filter for the main L+R pair, thus the desirability of choosing an amp that does.

 

[ppataki]

Not exactly. Low pass is built into the vast majority of subwoofers, but many -- perhaps most -- recent subwoofer designs don't provide a high pass filter for the main L+R pair, thus the desirability of choosing an amp that does.

I use DIY passive subwoofers only
For those you do need an LPF when you drive them with power amps (provided that there is no LPF feature on the power amp)

Normally I am not at all concerned with this since I am running fully active PC DSP based multichannel systems but I was thinking about putting together a simpler DIY system with such an amp but apparently I won't be able to use this model....

 

[Bruce Morgen]

I use DIY passive subwoofers only
For those you do need an LPF when you drive them with power amps (provided that there is no LPF feature on the power amp)

Normally I am not at all concerned with this since I am running fully active PC DSP based multichannel systems but I was thinking about putting together a simpler DIY system with such an amp but apparently I won't be able to use this model....

Understood.

 

[Ropeburn]

@AIYIMA Does the high-pass filter act also as a low-pass filter for the sub out at the same time?
(so if I set the HPF to 80Hz, would the sub out have an LPF at 80Hz too?)

Otherwise one would need an additional low-pass filter and that would kind of kill the whole benefit of having a high-pass on the amp....

99% of active subwoofers on the market have their own lowpass. That's a non-issue. HPF is what's been sorely missing on the market.

 

[Toni Mas]

99% of active subwoofers on the market have their own lowpass. That's a non-issue. HPF is what's been sorely missing on the market.

Yes and this is the reason why those subs just boost the bass like crazy and total randomly. You may get quantity but not quality. High passing the main speakers is simply not enough for clean subwoofer integration. You definitely need more control.

 

[Ropeburn]

Yes and this is the reason why those subs just boost the bass like crazy and total randomly. You may get quantity but not quality. High passing the main speakers is simply not enough for clean subwoofer integration. You definitely need more control.

And that is different to a lowpassed sub out on an amplifier exactly how? It's a simple lowpass in both cases. Doesn't really matter whether it's in front or after the subwoofer cable.

 

[Guddu]

Seems like @AIYIMA have made good efforts in correcting several typos/errors and additional information is published.

 

[Saponetto]

@AIYIMA team, good luck in your obvious confrontation with A3 Audio products!

 

[Guddu]

@AIYIMA team, good luck in your obvious confrontation with A3 Audio products!

What does it mean?
What confrontation with A3 Audio products?

I guess you meant 3e Audio products?

 

[Ropeburn]

It's called competition, not confrontation. And I'm sure both companies are very aware of each other and uphold some sort of friendly rivalry, as it should be.

 

[Saponetto]

What does it mean?
What confrontation with A3 Audio products?

I guess you meant 3e Audio products?

Doh, yes, I was meant to be 3e Audio.
For some curious motives I can't keep it in my memory.

 

[OldFunkyBones]

HPF markings are 60Hz, 80Hz, 120Hz and 200Hz. Feels like an odd scale given the spacing of the labels. Wonder if there are actual knob detents at those settings or if they're just labels on the case. Guessing the latter since the promo photo doesn't have the knob marker actually lined up to the 80Hz label?

 

[Toni Mas]

HPF markings are 60Hz, 80Hz, 120Hz and 200Hz. Feels like an odd scale given the spacing of the labels. Wonder if there are actual knob detents at those settings or if they're just labels on the case. Guessing the latter since the promo photo doesn't have the knob marker actually lined up to the 80Hz label?

Maybe a good point then, allowing to empirically find the "best" point between 60 and 200, since exact values make little sense, because of time/phase alignment, speaker placement and room modes...

 

[ﾠﾠﾠ]

why bother?

 

[JSmith]

Seems like @AIYIMA have made good efforts in correcting several typos/errors and additional information is published.

Yes changes have been made, however these small spelling errors (in red) are new, @AIYIMA;

JSmith

 

[Bruce Morgen]

why bother?

I was a know-it-all -- even after the tech support folks at both Kali Audio and SVS advised me to use the 80Hz high-pass feature of my sub, I ran the L+R pair directly and set the low-pass on my sub to where the bass response of my main L+R pair cleanly rolled off as per Erin's Klippel measurements. Then I tried it their way and, boy howdy, was the improvement ever obvious. IMO it's not only about unburdening the amplification -- which in my case allowed me to get significantly more SPL out of my system without triggering the IN-8's limiter -- but also about avoiding the increased distortion that most woofers manifest down near the low end of their response curves.

 

[Ropeburn]

I was a know-it-all -- even after the tech support folks at both Kali Audio and SVS advised me to use the 80Hz high-pass feature of my sub, I ran the L+R pair directly and set the low-pass on my sub to where the bass response of my main L+R pair cleanly rolled off as per Erin's Klippel measurements. Then I tried it their way and, boy howdy, was the improvement ever obvious. IMO it's not only about unburdening the amplification -- which in my case allowed me to get significantly more SPL out of my system without triggering the IN8 limiter -- but also about avoiding the increased distortion that most woofers manifest down near the low end of their response curves.

I would say getting more amplifier power is a lot easier and cheaper than getting lower speaker distortion.

 

[caught gesture]

why bother?

Why bother listening to Paul McGowan? If that is what you are asking, I’d say you raise a good point!

 

[Bruce Morgen]

I would say getting more amplifier power is a lot easier and cheaper than getting lower speaker distortion.

That's for danged sure!