Why sure!
On the measurements: something is wrong in the chain. In the last measurements the 1m one and the 2mm one show the same strange suckout. Almost impossible with correct functioning gear. These suckouts seem to be absent in former measurements. There is no consistency. I’d change gear and start over again.
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I just looked at that thread about amps. Yes, there is a point about Class AB advantage, when the amp is good (read: expensive) enough. But for limited amount of money - up to 100EUR, I do not see something more accurate and linear enough than popular TDA ones.
When the thread starts to pile with messages that someone uses old AV receiver from thrift store or "behringer", "crown" etc is mentioned - thread looses me very very fast...
When the thread starts to pile with messages that someone uses old AV receiver from thrift store or "behringer", "crown" etc is mentioned - thread looses me very very fast...
Well, any reasonable implementation of LM3886 or TDA7293 will do just fine. The composite implementations bring near to absurd distortion levels if one insists. But even the data sheet ripoffs perform far better than most if not any loudspeaker.
So, which one I should buy? Any European retailer is ok, it has to have volume knob, power supply and be in a box, not just a PCB plate. 20W per channel is enough.
150EUR max, preferably <100 EUR
This one is more than I paid for 2 channels of TDA325X (FX502s pro) with all the normal goodies of full amp: volume knob, on/off button, normal speakers terminals, normal adequate looks.
I could bet little money that this single channel thomann one is worse in almost every possible way. To be sure about that I will need to buy it, but... Nope.
160EUR for noname with limited usability when you can get some of the more interesting Class D ones for less or Yamaha entry big black box for 200-230EUR
You only need one channel. And that FX502, does it have a power supply, or is it PFFB? I have no experience with it, but these simple LM3886 amps often really do below 0,01% THD full power at 1kHz, raising slightly to a few times that at 20kHz. That is way below the specs of the FX502. I have a more elaborate design on the old LM4780 that has better specs than one of my USB interfaces. Not that I think very low levels of THD are the only criterium, but…
FX502s PRO - that is the model. No PFFB. Power supply included. That supply is a bit noisy, I tested with another one of the same voltage - another one was a bit quieter. But most noises come up when increasing volume on the volume knob. When increasing the source level - it is ok.
You need at least 2 channels as you most likely will use that same amp for developing speakers, which most likely will be 2-way.