HPA500 Dual Headphone Amp

11-26-25. (1) in Stock. Additional Units Available in 7-10 Days ***FULLY BUILT AND TESTED WITH WARRANTY*** The HPA500 is physically and electronically fully VPR 500 series compatible. It is an extremely powerful and musical sounding headphone amp that can make a deaf drummer's ears bleed! All of this capability and it only takes one 500 series slot. If you've been using your interface's built in headphone amp, you will hear a significant improvement using the HPA500. The HPA500's Left input source is the rack slot's input. The HPA500's Right input source is accessed by using a XLR Female to Female Coupler plugged into the rack slot's output. This gold plated contact XLR adapter is included with the HPA500 Entire Bundle. Special Features:  Nichicon MUSE capacitors in the audio path  Alps Blue Velvet hifi stereo potentiometer  OPA134 SoundPlus™ series operational amplifiers  Two headphone outputs via gold plated Neutrik 1/4" stereo jacks  Massive CAPI® level control knob Electronic Specifications:  Input Impedance: 20k ohm  Maximum Input Level: +28dBu @1kHz  Frequency Response: +/- 0.1dB 10Hz - 50kHz  Channel Separation: > 90dB  Signal-to-Noise Ratio, A Weight, 10Hz – IEC A: >105dB  THD+N at 1kHz, A Weight, 10Hz – IEC A: 0.0014%  Current Draw under typical operating conditions: < 95mA per bipolar 16V rail Output Specifications: (These are extreme conditions that would permanently damage your hearing)  Into 600 ohm: 1kHz @ max level of +22dBu / 92mA current draw / 10VAC RMS = 167mW RMS  Into 300 ohm: 1kHz @ max level of +22dBu / 93mA current draw / 9.76VAC RMS = 317mW RMS  Into 150 ohm: 1kHz @ max level of +22dBu / 110mA current draw / 9.12VAC RMS = 555mW RMS  Into 32 ohm: 1kHz @ max level of +20dBu / 215mA current draw / 6.13VAC RMS = 1.17W RMS  Into 16 ohm: 1kHz @ max level of +19dBu / 283mA current draw / 4.26VAC RMS = 1.13W RMS Maximum recommended output load is 16 ohm. For example, two sets of 32 ohm headphones.