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But in fact for the headphones some audiophiles do like to add some crossfeed

Anyway it's not a problem, even on Ifi ZEN CAN while this amp has a lot of crosstalk. But others not even close to ZEN CAN, so not a problem it's still stereo. If you really need to ged rid of it, then double mono is the way?

I didn't measure, I only used my ears(unpluged one side of headphone). I can say that Little Dot Mark 2 has no audible crosstalk and it's not balanced, Creative AE-5 headphone output has no audible crosstalk also. But Asgard 2 has it more then Sabaj A20h, The champ in crosstalk is IFi ZEN CAN...

I have Sabaj A20h and when I plug the headphones in 6.3mm it has no crosstalk, but when I plug in 4.4mm balanced it has a bit of audible crosstalk, Anyway the crosstalk is way less then in Asgard 2.

For all the power you need balanced dac. When you use balanced dac(XLR input to A20h) you have more power even on SE output from A20h

SMSL SP400 only has 8 relays, and even Flux labs FA-12s also has 8 . But original Topping a90 had quad potentiometer.

But anyway, crosstalk is less audible then even on Schiit Asgard 2

I think A20h is fully balanced it has four TPA6120. Topping L70 has the same number of volume relay(as I see). On A20h if you plug the phones in 6.3mm and plug in the dac in XLR and RCA, then you will hear the sound from XLR input is louder even on 6.3mm output.

My unit A20h also has slight crosstalk, but it is less then my Asgard 2 and way less then Zen Can. Actually when balanced to balanced it gives more crosstalk, then balanced to 6.3mm. Funny Little Dot mark 2 has zero audible crosstalk also Creative AE-5 headphone amp has no crosstalk at all.

What is the output impedence? Maybe headphones with lower impedence will perform better from single ended output?

my unit has no channel imbalance

why do you need less then 10 o'clock?

If you need DSD then d50.

I've checked the internals of Zen Can. Now I think is it really balanced? Because of volume potentiometer, is dual with 6 pins. While all other balanced amps use quad potentiometer or potentiometer has nothing to do with this. So the 4.4mm output has more power then 6.3mm. But is dual mono fully...

Bytheway lately I tried cheap 5v power supply from aliexpress(3$) with Zen Can and result was very bad- strong noise like squeak even on mute. So never try cheap power supply . I think Ifi must sell Zen Can with ipower.

I've checked now low volume - on my unit I don't have any problem with low volume channel imbalance. It's perfect even on lowest volume on both 4.4 and 6.3. Check input connection.

What do you mean by No volume on left channel ? Maybe it's the 4.4 jack problem. did you put it in till the end. 4.4mm is a tricky thing, Sometimes you need to push it in really strong. Anyway I don't have volume problem with Zen Can. Hiss noise is a ground loop issue(solved easy)

but it does't play DSD

5.2.b cancels sleep mode. But 5,3 or 5,3c goes of after 4 seconds of not in use I can hear small pop sound. Maybe it's only on my unit.

me too i stay on 5.2b. Because on 5,3 it goes to sleep constantly after 3 seconds and cuts of the biginnig of the sound .