not sure where you saw 55db SINAD for Purifi tbh ... see Purifi official data for 9040 module and I am driving them with my Benchmark LA4 pre-amp in cleanest possible bypass mode (no front-end buffers in the signal path)
Not sure why you are suddenly talking about amps that deliver on 55dB SINAD in this discussion...? At no time ever have I said the AHB2 is in any way flawed.
The spec sheets from Purifi and hypex are measured based on a bandwidth of up to 20kHz, where as Amir does it up to 45kHz.
Didn't you say that at 15KHz performance is dropping to 55db SINAD? Or maybe I misunderstood your post? In Purifi 9040 specs I just posted, I see nothing like that ... 20Hz - 20kHz
I believe those measurements are with front-end buffer boards in the signal path and with 20db gain settings ... Purifi alone has 14db gain and shows clean performance between 20Hz - 20kHz ... on the other hand, on that thread, AHB2 measurements were done with lowest 9db gain setting, which has the ultimately best measurements ... again not denying Benchmark's fantastic engineering, but also saying that Bruno Putzey should not be dismissed either. Otherwise it can sound clownish.
Both Hypex and Purifi datasheets use 20Hz-20kHz BW to measure THD+N. Thus, above 10kHz fundamental frequency THD+N plots show noise only. It is for the marketing reason, the plots look much nicer, then. Such measurements are pointless above 10kHz. Totally. They started to be used with class D. Before, 80kHz BW was a standard to catch 4th harmonic of 20kHz.
From Hypex. Purifi does the same exact thing.
Which actually means, in all practical home usage scenarios, it's all inaudible and mostly irrelevant, except for this type academic, hair splitting, type discussions, eh?
No, your Purifi amp is excellent, I have the Hypex, that too is excellent. Unless you somehow mutated to a bat and you can withstand extremely high SPL for a sustained long period of time without losing your hearing, then there is absolutely nothing to worry about.
Ok sure ... I am OK and perfectly happy with Alfa Romeo Quadrofoglio then (still Ferrari engine in it though)
I tend to agree, with slight caveat question ... is it better performing at all gain settings or just with ones (i.e. lowest) used for studio setups?
Don't even go down that rabbit hole to figure out which gain is better performing, it's all inaudible, as demonstrated in the measurements (Amir measures with different gain).
For my use the AHB2 isn’t enough amplifier power and this would sound bad to terrible to perhaps be damaging to my speakers in comparison to a set of monoblock Hypex NCX500
Underpowering your passive speakers cannot cause physical damage.
Are you serious?
I also want to discuss this a bit here. Class D amplifiers has been around for decades but Hypex and Purifi perfected the class D topology for their products and their products only.
Some AB amps are also shit. Some class A amps as well.. so what’s your point?
What you are describing is that your amp does not have enough power, so you push it to the limit, in which it starts to clip. That is different that having amplifiers that is not enough power and you don't get enough SPL.
No sir. That’s not correct
The difference is that people aren't universally saying all AB and A are great just because the Benchmark AHB2 is great. But it appears that some are misled to think all class D is great because Purifi and Hypex is great. And some posts on ASR almost reads class D = Purifi and Hypex.
