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https://www.ebay.co.uk/itm/New-6-35mm-Mono-Male-Jack-to-2-Dual-RCA-Phono-Female-Headphone-Splitter-Adapter-/152259953633
Hi-fi it is not... but if you keep the gain low it's tolerable for listening to in the same way as an old AM radio .
Soldering the two wires together will also work if you want to do it yourself.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
Otherwise there is a risk - small, but present - of each output trying to drive the other. In poorly designed electronics (ie most of it) this can result in damage to the output stage.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
Shorting L&R line outs together should not cause any serious problems with anything remotely modern. A headphone amp should be especially s/c proof since 8 Ohm phones DO exist! There is also every chance of a tangled cans cable being damaged and shorting. In short (HA!) if it can't stand a short it must be 'reet ***T!"
There is one special case however. If you have a 'proper' balanced line output and un balance it by shorting one leg to ground the unfortunate IC section will generate horrendous distortion and this can crosstalk into a wanted channel.
Dave.
Properly designed it'd have series resistance as Danny points out the iDevices do, but there's a lot of crap out there.
Agreed but a headphone amp is not a VERY low source resistance power amp. Any 1/2 sensible design will have a series resistance (to somewhat equalize drive for the variety of H/P Zs if nothing else) and therefore a total short is not possible. I.e. the amp should be continuously rated into it own load.
If you DO have a shit H/P amp that self destructs, bin it and buy better. My 20 quid Berry HA 400 is bomb proof.
Dave.
But for the sake of three resistors and a bit of heatshrink...