The Behringer HA4700 has become an industry standard for studio and live headphone distribution. Reliable and versatile, it’s just a great bit of kit.
Although it’s 4-channel, it actually has a couple of outputs on each channel as well as auxiliary inputs to allow mixing in of an external source.
The user manual (and specifications) are available here: https://media63.music-group.com/media/sys_master/h73/h22/8850137120798.pdf
PRICE: £50.00 plus £15.00 p&p to UK mainland. Cost of shipping includes insurance.