Fostex PH-50 5-Channel Headphone Distribution Amplifier - Studio Monitor Amp

Crown XLS1000 High-Density Power Amplifier

ECLER eHSA2-150 - 2 Channel Amplifier - Used

Ashly TRA-2150 2 channel amplifier Tested 150 Watts per Channel

Alesis RA-100 Reference Amplifier

Advanced Technology Design Series Model 221 Power Amplifier

Samson QH4 4-Channel Studio Headphone Amplifier,Black/Silver

PreSonus HP4 Headphone Amplifier 4-Channel Amp Power Tested-No Cables Included