Stereo to Mono

[pastafarello]

I'm looking for a pair of decent quality mono headphones. Not many to choose from, so far the choices seem to be:
 
- Stanton DJ PRO 2000S
 
- Koss PRODJ200
 
From specs and reviews, it looks like the Koss is the better choice. Any comments or opinions on these (or better) ones?
 
I also found a little gadget, the 1BUD-S2MA
http://www.scansound.com/1bud-stereo-to-mono-converter.html#
which claims to "[e]lectronically [mix] the left and right channels together" and "does not short together the audio channels". I'm a bit skeptical about this, but perhaps someone knows a little more about it.
 
Thanks in advance.

 

[Mr Rick]

Buy one of these:
 
https://www.amazon.com/Monoprice-Metal-6-35mm-Stereo-Adaptor/dp/B004C4UQZE/ref=sr_1_2?ie=UTF8&qid=1479658535&sr=8-2&keywords=stereo+mono+plug
 
 
Any headphone will work in mono with an adapter.

 

[pastafarello]

Thank you for your reply.
 
Unfortunately, your suggestion -- a 6.35mm Mono Plug to 3.5mm Stereo Jack -- is totally unsuitable for this purpose.
 
I suppose I made a very poor job of explaining what I'm looking for. I want to sum (convert) the stereo signal of the headphone output of a stereo headphone amp to a mono signal, so that the same summed signal is distributed to both cups of a pair of full-sized headphones.
 
The TS-to-TRS adaptor you suggested is suitable for connecting a pair of stereo headphones to the output of a MONO headphone amp. It should NOT be used on a stereo (TRS) jack! (It would short one channel -- usually R -- to the ground, thus possibly damaging the output stage, and allow only one channel -- usually L -- to be heard.)

 

[Roderick]

EDIT: - misread the problem description