Samson S-phone Headphone Mixer/Amplifier

The S-phone is a versatile single rack space four channel headphone amplifier, loaded with advanced 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. Each of S-phone's four channels includes three Headphone Outputs with an overall Volume control and individual Level meters. A convenient 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. The Balance control adjusts the ratio of the Main and Auxiliary signal or the left to 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 ("More Me"). For greater sonic control, S-phone also features a 2-band equalizer on each of the four channels. A master Stereo Aux input on the front panel is also supplied for inserting a second signal to all headphones.

Key Features

4-Channel Headphone Mixer/Amplifier
Two Master Stereo Inputs plus Stereo Link Output
8-Segment LED Metering on Each Channel and Master
Two Band Equalizer on Each Channel
Three Headphone Outputs per Channel (One Front Panel and Two Rear Panel Outputs)
Auxiliary Input with Balance Control provides four Channels of "More Me" Mixing
Mute and Stereo/2 Channel Mode Switches on Each Channel
Maximum Output Power on Each Channel (Regardless of Headphone Impedance)

Technical Specifications

Master Section (Rear Panel)
Input: 2 TRS Balanced 1/4" (Left-Right) or (Left mono)
Impedance: 15 k Ohms balanced
Max. input level: +26 dBu balanced
CMRR: Min 40dB, >55 dB @ 1 kHz
Master Section (Front Panel)
Master Volume control: 0 - 10
Master Level Meters: 5 Segment LED (-30 to Clip)
Master Inject: 1/4" TRS jack (Left-Right)
Link Output
Connectors: 2-1/4" TRS Balanced (Left-Right) Parallel to Main Input
Max Output Level
Matches Main Input: Channels
AUX IN: Connectors 1/4"TRS jack (Left-Right)
Impedance: 10 k Ohms unbalanced
Max. input level: +21 dBu unbalanced
Level Meters: 5 Segment LED (-30 to Clip) (load compensating)
Channel Controls: Mute Switch, ST/2CH Switch, Volume Control Balance Control
High Frequency: EQ +/- 12dB @ 10KHz Shelving
Low Frequency: EQ +/- 12dB @ 100Hz Shelving
Outputs: 3 - 1/4" TRS (Left-Right) Headphone outputs per Channel
Max. output level: 140 mW at 32 ohms, 385mW at 66 ohms.
Impedance minimum: 8 Ohms
Global Specifications
Frequency response: 10 Hz to 32 kHz, +0/- 3 dB
Noise: > 90 dB, unweighted, 22 Hz to 22 kHz
THD: 0.008 % typ. @ +4 dBu, 1 kHz
Power Supply
Mains Voltages USA/Canada: 105-125 VAC ~, 60 Hz
Power Inlet: Standard IEC receptacle / with fuse
Power Consumption: 29 Watts Max.
Physical
Dimensions: 1 3/4" (44.5 mm) * 19" (482.6 mm) * 8 1/2" (217 mm)
Net Weight: 5.5lbs., (2.5 kg)