Crossfeed solution

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Of the 6 versions that I linked to in post #7, we finally settled on the passive Danyuk.
More than 10 people have tried this and none of them has gone back to no cross feed afterwards.
https://www.diyaudio.com/forums/pass-labs/271926-f5-headamp-11.html#post4759695
https://www.diyaudio.com/forums/pass-labs/271926-f5-headamp-10.html#post4671587

Dimitri also went for our passive version in his own HPA design :
http://www.linearsystems.com/lsdata/others/Headphone_Amplifier_Evaluation_Board.pdf
(See Ref. 4 & 5)


Patrick
 
I listened by far only the software plugin crossfeed, included in foobar's DSP manager...and I have split conclusions...some recordings sound better, some don't...it's hard to say "better or worse". But for sure it sound interesting and different...
I don't want to reload an old thread, if there's one, please redirect me, but I should rather make a passive filter after the phones output, I won't modify an existing good amplifier, especially a good sounding one, to add a certain neliniarity to the sound. But for those recording, especially vocals, where crossfeed seems to be pleasant, for me, I should add a little box and keep it along with the headphones I use for listening those recordings I think can benefit from crossfeed.
 
A crossfeed after the amp depends entirely on the impedance characteristics of your headphone.
So you will need a customised one for each specific phone.
There is no universal solution.

The circuit in post #13 you can build as an add-on before your headphone amp.
The only requirement is a high input impedance (e.g. 100k).
If you (like me) have a 10k pot at the input of the amp, then just replace R4, R8 by 12k.
Works perfectly.

The crossfeed will attenuate the input by 10dB.
So you need to turn the volume up.
And you can remove it anytime with no consequences.


Patrick