right and left signals playing through both speakers
this is known problem - intentialy introdussed crosstalk make the sound more voluminous - sound field enhancer to expand the stereo base of sound
to get rid of it you need to install software mod from
https://drive.google.com/drive/folders/1SKf0bsu4hsyrZfus7lhQOkdyvHBwDp1Z?usp=drive_link
please read details at
https://4pda.to/forum/index.php?showtopic=1035722
p.s.
some explanations
The device has a problem with large mutual penetration of channels into each other - CrossTalk. All reviews confirm it. It can be easely tested. All the parameters of the device are excellent and top-notch, but the only one that stands out - CrossTalk!
Research by respected folks on the ixbt Russain forum showed that this is not mutual penetration of channels in its pure form. And as far as I understand, this is a deliberately included by vendor sound field enhancer, mixing channels into each other in antiphase. This is done to expand the stereo base and create artificial depth of the sound stage.
On a good hifi amplifier and acoustics, this enhancer is definitely not needed.
But if you have very budget equipment and you are not fighting for the ultimate high fidelity, then it is better to leave it as is. It really expands the stereo base and gives a very beautiful scene. On budget acoustics and an amplifier, it looks quite decent and beautiful. It's like the flavor enhancer monosodium glutamate, which was generously sprinkled on DP3 and DP5
I did test like this:
I turned the balance on the amplifier from one extreme to the other. I'm playing a file with R sound, and the balance is turned all the way to the L speaker
So:
1) on the uncorrected firmware, I clearly start to hear a squeak in the L speaker at 30 units of volume of the 60-watt Rotel A12 amplifier, and at 50-60 units, the parasitic squeak of 1000 Hz becomes unbearable in volume! It's unbearable - I want to run away.
2) on the firmware with edits, I start to hear a squeak at 60 units and I turn the volume up to 99 units without pain in my ears from the squeak. I just clearly hear the parasitic squeak at full 100% volume without any harm to my health.
Crosstalk is observed only in player mode, when the enhancer is working. There is no crosstalk in DAC mode.