@MDR30
Thanks - great photos, and information!
Yes, this seems to be my options:
«1. An adapter with two TRS plugs and one female 4-pole XLR gives you the freedom to listen to anode or cathode with your headphones ordinary 6,35 mm plug, or balanced with the adapter. And makes it possible to listen balanced with most other headphones (Pentaconn plugs excepted, and other non-standard connections).
2. You can make a custom cable with four leads (+/-/left/right) but then you need a Y-split to connect the cable to the two TRS-plugs as output is crossed between the left and right leads to the cups (drivers) of the headphone. Such a cable, to my knowledge, is not available but has to be made up.
3. If you want to be drastic you replace the two TRS outputs of the amp with a 4-pole XLR jack.»
Or even – to be really drastic – mount a balanced mini jack (pentaconn - TRRRS) contact, as well as the XLR contact, on the Jade. If I want to play balanced from a DAP, for example (pentaconn now quite standard?).
Solution nr 2 seems the best now, as a first step. Maybe I give up the idea of buying a cable fit for my earphones and then cut it and install the big jacks on the preamp end. Instead I start from scratch, buy the two small plugs that fit the phones, the two big jacks for the Jade, and ca 1.2 meters good cable. I mean, how hard can it be? Even with my low level soldering skill.
In that case, I need acceptable cable (and connectors). I know that the Nightowl and Nighthawk headphones are cable-sensitive. Better cable (and shorter cable, at least for single ended drive) improves the sound. I don’t want to over-invest. But the cable should sound OK, not worse than the stock Audioquest cables (and better sounding is of course fine too). I don’t want to end up in a plus and minus situation where balanced sounds better in some ways but not in other ways (cable less good).
All help warmly appreciated.
PS Like I've said before, where is the audio prize of honor to Joe Lau for the remarkable Jade preamp. It made me fall in love with OTL sound fifteen years ago and I am still not 'cured'.