I totally agree. The SINAD test results are nice to have but they don't always tell you about the actual sound quality or if you will like one device over another.
Here's an example. My Purifi based March Audio P452 amplifier arrived and I have been testing it. The numbers on this amp are absolutely great. As expected, the amp is mostly neutral. Meaning what you feed into it is what you will get.
However, there are all sorts of other details I didn't know until I tested it with the BMR's and my Denon 4700 and Hegel H90 via pre-outs.
As it turns out the volume control on the Denon has to be 3 steps higher to match 75dB with the March P452 vs the internal Denon 4700 amps. AND with the Hegel H90 the volume has to be 5 clicks higher to match the same 75dB. My guess is this may be a result of the 26.5dB gain while using XLR to RCA cables. I'll try an XLR DAC and see how that compares.
The other thing I discovered was the March P452 amp only requires 16 watts to get to 75dB while my Monolith 7X takes 160 watts. lol
The really interesting part is out of all these tests REW shows the BMR freq. response to be almost identical with every setup and yet the little 60W Hegel H90 offers the tightest bass and midrange of all the options in my listening tests including the $1600 Purifi 420W amp connected to the Denon 4700 or the pre-outs on the Hegel H90. If I had to rate which setup I liked best it would look like this:
1. Hegel H90 with 60W internal amp.
2. Hegel H90 with March P452.
3. Denon 4700 internal amp.
4. Denon 4700 with March P452.
It's really interesting how REW can provide nice freq responses but it's not going to tell you whether you will actually like the sound better than XYZ with the same freq response.
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The journey to find the lowest numbers will not always take you to the best sound! It's an expensive lesson to learn.