Eggs Ackley
Active Member
- Joined
- Sep 20, 2021
- Messages
- 152
- Likes
- 267
331.55 on Amazon with 5% back on Amazon card.Screw it, its only 350, (i can get of for 335)
331.55 on Amazon with 5% back on Amazon card.Screw it, its only 350, (i can get of for 335)
Measurements look convincing, but let us please know how the trick works to obtain 2x120W (=240W) output power from a PS rated at 38V x 4A (=150W)?Thank you so much Amir for the review. This is a very important project for me and I'm so glad the hard work paid off.
The rating on the powerbrick is continues for hours and hours,(thermal) but doesn't exclude it can deliver more for short periods....
Don't buy it then and stop complaining$260 is where it feels it should be.
You get 240VA into the speaker from 150WMeasurements look convincing, but let us please know how the trick works to obtain 2x120W (=240W) output power from a PS rated at 38V x 4A (=150W)?
This is where I got the number, where is says A-weighted.
Didn't Amir say the company was located in the Phillipines?I didn't read the whole thread, so thanks for pointing to that. However XRK is based in DC, so his assessment can be a bit skewed considering Topping is a fully Chinese operation.
My question was only to do with noise. Whether the AUX040 filter gives any advantage to Class D noise measurements compared to noise measurements for Class AB. But from what I can find, I am starting to think the Class AB amps are not disadvantaged by the way things have been measured.Yes, thats the only one, It's just a noise measurement. You have the same thing unweighted just below it. Everything else and all the THD plots appears to be unweighted and with an AES17. There is also at least one THD plot with both 20kHz(AES17) & 80kHz BW.
As I wrote before, an Apples to Apples comparable measurement would be the 19+20kHz IMD plot.
Amir does a multitone plot that addresses the same thing, but for comparison reasons the two tone would be a good complement as that has atleast historicaly been more used.
My question was only to do with noise. Whether the AUX040 filter gives any advantage to Class D noise measurements compared to noise measurements for Class AB.
I totally agree with your opinion.IMHO, this thread has gone off the rails. If it was so easy to grab a fist-full of off-the-shelf parts and make a >45 watt amplifier with SINAD above 100 dB, there'd be lots of them. As it is, all of the amplifiers that we've seen with this performance except for the PA5 cost thousands of dollars, are kits, or both.
An audio product that's worth owning is more than the sum of its parts. John has obviously put a ton of engineering effort into the PA5. There's tremendous value in the experience he and his team bring to the table, as evidenced by the consistently great measurements from Topping products on this site.
If I was in the market for an ultra-performance desktop amp, I'd happily pay $1k for the PA5. It's a steal for $349, so I may buy one even though I don't currently have a use for it.
Hey, could you verify the build quality please ?
IMHO, this thread has gone off the rails. If it was so easy to grab a fist-full of off-the-shelf parts and make a >45 watt amplifier with SINAD above 100 dB, there'd be lots of them. As it is, all of the amplifiers that we've seen with this performance except for the PA5 cost thousands of dollars, are kits, or both.
An audio product that's worth owning is more than the sum of its parts. John has obviously put a ton of engineering effort into the PA5. There's tremendous value in the experience he and his team bring to the table, as evidenced by the consistently great measurements from Topping products on this site.
If I was in the market for an ultra-performance desktop amp, I'd happily pay $1k for the PA5. It's a steal for $349, so I may buy one even though I don't currently have a use for it.
Agree. The only question I'd have would be whether this amp has sufficient power for far-field listening with somewhat inefficient speakers played at levels above 85-90 SPL. Personally I don't even care as I don't listen at levels above that, and I think very low-efficiency (below about 85dB) passive speakers are just dumb (again, personal opinion).
But aside from that, I have trouble seeing an issue here. Excellent linearity, super-low distortion, very low noise, 1.73x increase in power from 8 ohms to 4 ohms (not 2x but respectably close), load-invariant in the audible range, superb crosstalk performance, two balanced inputs, and costs only $349.
The issue, as I see it, is that folks are getting hung up on the "120 watt" at 10% THD spec. I understand why this upsets folks, but FFS, we have extensive measurements showing the true performance here and it is stellar, so get over it and stop beating a dead horse.
As for the price, would anyone seriously claim that a Hypex NC122-based amp actually produces the stated 125wpc into 4 ohms? No. As an NC400 (or Purifi 400) amp typically produces about 150-175 wpc into 8 ohms before any clipping occurs, we can estimate that a Hypex 122-based amp will supply about 50-55 wpc real-world into 8 ohms. I just found a 122-based stereo amp from VTV - one of if not the most inexpensive Hypex/Purifi assembler - with only one input and no volume control, for $500.
So how this $349 amp can be seen as anything other than a stellar performer and excellent value is beyond me.