Where do you get these numbers. Both are way off. Real sensitivity is about 84 dB at 2.83v at 1m. Which is to be expected from a small speaker with this kind of bass extension.
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Topping PA5 Review (Amplifier)
- Thread starter amirm
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Well, it is not a switcher, that's what counts.
- Joined
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I'm not sure how how much that actually "counts," but yes, "it is not a switcher," but more of an elaborate "tracker" design -- an idea pioneered by Bob Carver decades ago, but vastly improved upon by Benchmark. That said, aside from power, the PA5 is awfully close in measurable performance and, going by Amir, it's audibly impressive too -- despite being "a switcher" built around an off-the-shelf Class D chip.
You’re right. It’s 83db, not 93db. Sorry for the typo.
Do you think the Topping PA5 will be able to drive the Kef LS50 Meta?
It’s for listening in my kitchen at not really loud volume.
DS23MAN
Active Member
Will be more than enough. Used to play with Kef Carlton speakers on a 2x 20 watt in my teens, loud enough to get my neighbours complaining....
BoredErica
Addicted to Fun and Learning
NTK already answered your question. It'll be fine.
Do anybody know how @amirm meassures class D amplifiers. Is the appropiate low pass filter used? https://www.ap.com/analyzers-access...mily-switching-amplifier-measurement-filters/Can be and it's switching frequency may end up in the audio range
//
DanielT
Major Contributor
I had managed to play loud enough with a 2x5 W mini tube amp and disturb the neighbors.
Edit
The neighbor then a sensitive whiny bit..
Last edited:
restorer-john
Grand Contributor
Yes, he does use an appropriate filter. I believe it is the AUX-0040.
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OP
- Thread Starter
- #1,212
Yes. AP AUX040 is used.
DanielT
Major Contributor
Aha, it goes up to 40 kHz. Do you not need to get up to 80 kHz when measuring class D amplifiers?
I have in mind that I read it somewhere. Do not know if it's true.
How much does this affect the comparison of noise level with the AHB2 where the filter is not used? Looking at A weighted numbers (Soundstage for AHB2 and L7Audiolab for PA5) it looks like the Benchmark has a couple/few dB lower noise.
AHB2: 11uV (A-weighted, 23dB gain)
PA5: 14uV (A-weighted, 19dB gain)
Measurements of Topping PA5 PowerAMP - L7Audiolab
台式设备 昨天早上我发布了一个让人印象深刻的测量：Fast Measurements of Topping New PowerAmp，那么简短的发布自有原因----我昨天比较忙=。=！好了，当夜幕再度降临，妻儿都已进入梦乡，我开始赶这篇 Topping PA5 PowerAMP
www.l7audiolab.com
restorer-john
Grand Contributor
This:
Goodness knows what AP charged for it, likely a kidney.
Goodness knows what AP charged for it, likely a kidney.
restorer-john
Grand Contributor
What is the bandwidth for the Soundstage noise measurement?
At the end of the day, I personally believe you can't have one topology getting an outboard brickwall filter and another being disadvantaged by not having the same filter, especially with some Class ABs having SMPSs powering them, they end up being disadvantaged if they are measured 'wide open'.
OP
- Thread Starter
- #1,218
Flat response is to 40 kHz. Actual bandwidth is over 200 khz.Aha, it goes up to 40 kHz. Do you not need to get up to 80 kHz when measuring class D amplifiers?
I have in mind that I read it somewhere. Do not know if it's true.
For bandwidth I thought defined by the A-weighting. Would there be more to it?
On the disadvantage, that's what I am wondering. I don't think it's wide open but still not apples to apples. 20Hz-20KHz bandwidth on the one case, and 20Hz-20KHz plus AUX040 on the other, if I understand correctly.
In the link you posted you gave part of the answer where the PA5 is measured at 5W 8 Ohm with both 20 and 80kHz BW. But measuring a switcher at 80kHz is going to make it look worse than it is, if at all possible to measure. 20kHz is obviously going to make them look way better than they are. 40kHz I dont know but a standard 19+20kHz IM measurement would make the BW thing a moot point, I think
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