The PHA40 4-Channel Stereo Headphone Amplifier from Pyle-Pro is a compact and lightweight stereo headphone amplifier that allows up to 4 users to listen to the same audio signal. The amp has a stereo 1/4" input jack and a set of 4 stereo 1/4" outputs. Each output has its own level control knob, letting users set their ideal volume level individually. There is a red power LED to provide visual indication that the unit is receiving power. It operates on 12VDC power via the included power supply.
| Number of Channels | 4 |
| Input Impedance | 100 kOhms, Unbalanced |
| Output Impedance | 80 Ohms (Each Output) |
| Input Level | +15dBu |
| Output Level | 40mW @ 100 Ohms |
| Gain | 20dB/Channel |
| Signal to Noise Ratio | > 90dB |
| Total Harmonic Distortion (THD) | < 0.03% |
| Connectors |
1 x 1/4" TRS Stereo Input 4 x 1/4" TRS Stereo Outputs 1 x Power Input |
| Power Requirements | 12VDC, 150mA |
| Dimensions (WxHxD) | 4.07 x 1.18 x 2.24" (104 x 30 x 57mm) |
| Weight | 0.42 lbs (0.19kg) |