4 Channel Headphone Amplifier with EQ and Auxiliary Inputs
Our Price $429.00

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The S phone is a single rack space four channel headphone amplifier that allows for monitoring any stereo or monophonic source signal (balanced or unbalanced) over as many as twelve separate headphones, and is loaded with features that provide tremendous flexibility for monitor and cue mixing.

The master input features an input level and LED meter to control and display the overall stereo input. A master inject input allows for a secondary stereo source to be mixed in with the main input signal. Each of the S phone's four channels includes three headphone outputs (one on the front panel, two on the rear) with an overall volume control and individual level meters. A stereo auxiliary input is available on each channel so that individual line signals from direct or buss outputs can be mixed with the main stereo input on that channel. The balance control adjusts the ratio of the main and auxiliary signals or the left/right balance (based on the setting of the ST/2CH switch) so that each headphone mix can be further tailored for a particular listener's individual needs.

The S phone also features a two band equalizer on each of the four channels. Providing unusually high power levels and high audio fidelity, the unit is compatible with virtually all popular headphone models and can be used in a wide variety of applications, including recording studios, teaching labs, broadcast environments, and for live performance.


  • Four totally independent high-power stereo amplifiers in one rack space
  • Three headphone outputs - two rear, plus one front panel output per channel
  • Two master stereo inputs with balance control
  • Dual band equalizer on each channel
  • 8 segment LED meter on each channel plus master
  • Auxiliary input with level control on each channel
  • Stereo or dual input mode and mute switches on each channel
  • Maximum output power on each channel regardless of headphone impedance


Number of Channels: 4

Input Connections: 2 x 1/4" TRS phono Main Input (rear panel,)1 x 1/4" TRS phono Master Inject (front panel), 4 x 1/4" TRS phono Auxiliary Input (per channel, front panel)

Output Connectors: 4 x 1/4" TRS phono Headphone Outputs (front panel, )8 x 1/4" TRS phono Headphone Outputs (rear panel, )2 x 1/4" TRS phono Link Output (rear panel)

Maximum Output Level: 140 mW at 32 ohms, 385 mW at 66 ohms
Function Controls: 4 x Volume, balance, treble, bass rotary control, 1 x Input rotary control, 2 x Switches per channel (illuminated)

Frequency Response: 10Hz to 32kHz, +0/-3dB

Distortion (THD): 0.008% typical @ +4dB, 1 kHz

Noise: >90dB, unweighted 22Hz to 22kHz

Display: 5 x 8 Segment LED (30 to Clip)

Dimensions: 19" x 8 1/2" x 1 3/4"

Weight: 5.5 lbs

Specialties: Link output which mirror the main inputs allow for multiple S phones to be linked together

Samson S - Phone Headphone Amplifier
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