The XPH4 4-Channel Stereo/Mono Headphone Amplifier from SM Pro Audio is a compact and durable headphone amplifier that allows up to 4 users to listen to the same audio source. The amp has a durable hardened steel chassis that stands up to the demands of professional use. Inside, there are 4 individual amplifier circuits to offer high-quality audio that's suitable for professional applications.
The rear panel has individual left and right RCA inputs to support mono or stereo audio signals. There is also a 3.5mm input for additional versatility. A selector switch lets you set the amp for stereo or mono operation. The front panel has 4 individual 1/4" jacks for connecting headphones. Each output channel has its own volume control so users can set their preferred level without affecting others.
Note! Powered by a 12-18 VDC adapter, available separately.
| # Of Channels |
Input: 1 (stereo/mono) Output: 4 |
| Frequency Response | Not specified by manufacturer |
| Signal to Noise Ratio | > 98 dB |
| Gain Range | 19 dB per channel |
| Controls and Indicators |
1 x Mono/stereo selector switch 4 x Volume knobs 1 x Power LED |
| Connectors |
1 x RCA input (2 jacks, L/R) 1 x 3.5mm TRS stereo input 4 x 1/4" TRS stereo headphone jacks 1 x DC power input |
| Input Level | +22 dB |
| Input Impedance | 100k ohms |
| Output Impedance | 10 ohms, each output |
| Construction | Steel |
| Power | 12 to 18 VDC |
| Dimensions (HxWxD) | 1.5 x 3.5 x 2.1" (38 x 88 x 54 mm) |
| Weight | Not specified by manufacturer |