The product is discontinued. Please find below for alternative products.
the mackie hm-4 is a 4-way headphone amplifier des more info
alctron 8 channel studio headphone amplifier with more info
PrimaLuna Evo 100 Power Amplifier more info                  
rolls ha43 - 4 output stereo headphone amplifier
more info
the audiophile headphone amplifier with innovative more info
introducing the ld sytems hpa 4 - a compact and po more info
an affordable 6-headphone monitoring amplifier! th more info
Denon PMA-1600NE Integrated Amplifier more info              
polsen hma-41 4-channel stereo headphone amplifier more info
get the most out of video conferencing with the mx more info
the m-audio bass traveler is a portable headphone more info
tap into any pa setup! the art headtap headphone a more info
McIntosh MC830 1-Channel Solid State Amplifier more info     
ld systems 19" headphone amplifier 6-channel
more info     
the nth-cable is a high-quality flexible cable for more info
NUX GP-1 Guitar Headphone Amplifier more info                
alctron ha130 professional in-ear monitoring headp more info
Pro-Ject Tube Box S2 Phono Pre-amplifier more info           
jk audio remoteamp headphone/earpiece amplifier
more info  
this sonarworks headphone edition and monoprice he more info