The same
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welwynnick
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The PA7 has good measurements, but do you seriously think it's transparent?
Bleib
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Well, the high frequency response on PA7 is not as great but it's a clean performer otherwise
I had LA90 and went to PA5 II and didn't notice any difference
staticV3
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Do you have data that says it isn't? I'd love to see it!
MAB
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It does have a response variation above 5kHz.
It's a small dip. Some may be able to hear the dip under the right conditions.
YMMV!
welwynnick
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Is that really necessary? Surely you've already seen it. The PA7 measures great at 1kHz and at 1W, but LA90 measures well everywhere:
staticV3
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This measurement does not account for music spectra:
Is SINAD around 5-15 KHz relevant?
I’m trying to build some active 3-way bookshelves. At this point, I need to decide for amp selection for my high frequency >2.5 KHz. I love Hypex products and will be powering the low end and midrange with hypex modules. I’m a bit hesitant about the tweeter amplification. Most newer class D...
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babadono
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I am a little confused. Are you saying it happened all by itself during shipping? It was packed extremely well by Topping and then another outer box to carry 2 together by either Topping or Shenzhenaudio. I will look closely at the second unit when I unpack today.We tested it by tapping the ring on the plug with an adapter chassis and we were able to replicate the situation. This should be the case, the plan is to probably add a sleeve to future packaged plugs if the box space allows it.
Anyway, thank you for your feedback
MAB
Major Contributor
Yeah, I can't hear that level of distortion in that frequency range.This measurement does not account for music spectra:
Is SINAD around 5-15 KHz relevant?
I’m trying to build some active 3-way bookshelves. At this point, I need to decide for amp selection for my high frequency >2.5 KHz. I love Hypex products and will be powering the low end and midrange with hypex modules. I’m a bit hesitant about the tweeter amplification. Most newer class D...
At the risk of speculating since I clearly don't know the circuit, the oddly rising distortion is in the same frequency region as the odd FR dip. I wonder if these are linked, tradeoffs, etc...
Bleib
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Except power. It's good enough in mono mode though
welwynnick
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I take your point, but I don't think that lets the PA7 off the hook. When you crunch the numbers, you find although the amp is only generating a few watts at high frequencies, the PA7 distortion is still 30-40dB higher than the LA90. And when you also take equal loudness contours into account, the 5kHz area is quite a battleground.This measurement does not account for music spectra:
Is SINAD around 5-15 KHz relevant?
I’m trying to build some active 3-way bookshelves. At this point, I need to decide for amp selection for my high frequency >2.5 KHz. I love Hypex products and will be powering the low end and midrange with hypex modules. I’m a bit hesitant about the tweeter amplification. Most newer class D...
babadono
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Well I am only able to get about 130 watts into 8 ohms out of this thing. Even bursting a 1kHz signal at 10% duty cycle. And it does not clip like any amp I have ever worked with. The output starts to break up. At 130 watts continuous for about 5 minutes I read approx. 50 C on the case and front and about 65 C on the heatsink. I will be running the bass bins of my 3 way Jubilee and will NEVER need anywhere near this much power. But I wanted to test nonetheless.
antcollinet
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Harmonics of 5KHz (10KHz and up) are not though - and this is what matters.
welwynnick
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Do you only listen to tones?
Intermodulation matters too.
antcollinet
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Sigh
Yes it does.
But now you have 5Khz already at around -20dB fs, then THD at 5KHz is a good 80dB down from that. So harmonic products down at -100dB at most.
You are deluding yourself if you think you are going to be hearing that.
And this is what total of HD plus IMD looks like with a multi-tone (worse than music) input - rising to a max of -100dB at 20KHz. So yes, transparent:
A new mono amp with an outboard power brick is either for a passive sub or for mono listening.
I know I don't think I have that right but I don't see any other use-case... except for doubling-down for a second amp+brick combo.
I know I don't think I have that right but I don't see any other use-case... except for doubling-down for a second amp+brick combo.
Wasn't there a conversation about heat-sinking compounds in some Topping amps which 'caked' in about a year's time?
CRobbins1701
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Is everyone saying I made a mistake buying the B200?
antcollinet
Grand Contributor
No - everyone is just talking shit - as we usually do
