Hi Tim,
Thanks, I am really glad there is not much volume and no distortion. I always use EQ and DX220 is my next DAP definitely. Please test the PEQ when you can and comparison with Lotoo's PEQ would really great.
So I spent some time this afternoon with PEQ and doing some comparisons to EQ and with neither engaged.
What I found is that one has to be very judicious in PEQ with how much boost you use, and obviously the other parameters as well, or you will get distortion. I listened to several tracks from the Alpine Official Reference Disc Car Audio Nationals II CD - all were WAV files, and a few other MP3 tracks from Led Zeppelin, LA Guns, and Krokus. When pushed to levels causing distortion it did appear that MP3 (128 Kbps) suffered more than the WAV files. Here are the EQ and PEQ settings I ended up comparing - originally for the PEQ I had Filter 1 (F1) at +7 dB with Q = 0.5 and F5 also at +7 dB and Q = 0.5 but that was way too much!
EQ Settings
33 +6, 63 +5, 100 +4, 330 +2, 630 +1, 1k +2, 3.3k +4, 6.3k +5, 10k +6, and 16k +5
PEQ Settings
F1 Peaking, 33Hz, +5 dB, Q = 0.3
F2 Peaking, 150Hz, +2 dB, Q = 0.5
F3 Peaking, 800 Hz, +1 dB, Q = 0.5
F4 Peaking, 4000 Hz, +3 dB, Q = 0.5
F5 Peaking, 10000 Hz, +5 dB, Q = 0.3
F6 Peaking, 16000 Hz, +4 dB, Q = 0.5
Volume level was about 125 for EQ and Flat and down to about 104 for PEQ. All listening was with my Sony MDR-EX650 T iem's and at these levels the distortion was low enough for me - more tweaking/fine tuning is obviously possible.
Curious if anyone else has experimented much with the PEQ yet? Please share if you have!
Enjoy,
Tim