Rolls HA243 4-Channel Studiophile Headphone AmplifierThe HA243 is a high powered headphone amplifier with four 1 4" and 1 8" (3. 5mm) headphone outs. The HA243 features an A B switch for each channel to monitor either the A or B input with the flick of a switch! Features: 4: 1 4" TRS Headphone Outputs with Level Control. With the new JRC3414 I. C.'s it has plenty of gain!!! 1 4" , 3. 5mm and RCA A and B Inputs. Switchable mono or stereo for both A and B inputs The HA243 is a four channel headphone