Furman SP-20AB - Half-Rack Stereo Power Amplifier - 20W per Channel into 8 Ohms (Balanced Connectors)

Furman SP-20AB - Power/Headphone Amplifier


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The SP-20A is a stereo power amplifier housed in a half-rack chassis that delivers 20 watt per channel into either 4 ohms or 8 ohms. It is ideal for recording studio applications, where it can be used to drive small reference speakers, or as a headphone driver for the HR-2 headphone remote stations, while doubling as the tape playback amplifier in the tracking room.

The SP-20A may be operated in any of three modes as selected by a rear-panel switch: normal stereo, two channel mono, or single channel (bridged) mono. The latter mode allows a power output of 40 watts provided the load is 8 or more ohms. Output is available through either of two connectors. Standard banana jack binding posts for speakers, or through a male XLR connector. The latter allows the unit to become the headphone driver.

The amplifier has an input level control on the left side of the front panel. A pair of yellow LED's, one for each channel -- light up whenever signal is present. Another pair of red LED's warns of any overload condition present in either channel. The SP-20A is fully protected against thermal overload, and it can withstand a short circuit on any or all outputs for an indefinite time without damage.

Stereo power amplifier ideal for small speakers or headphone system
Toroidal transformer provides for ultra-quiet performance
Overload and signal-present LED's for each channel
Bridged mono, two channel mono and stereo operation
Speaker on-off switch
Front panel headphone jack with volume control
Convection cooling system dissipates heat through the heat sinks and chassis for optimal cooling and maintenance-free operation
Power Rating Stereo @ 4 ohms: 20 watts per channel
Stereo @ 8 ohms: 20 watts per channel
Bridged @ 8 ohms: 40 watts
Damping Factor 120 at 1kHz
Input Sensitivity -1.9dBu (625 mV) required for full output into 8 ohms
Input Impedance 20k ohm
Gain Not specified by manufacturer
Frequency Response 20Hz to 20kHz, 1 watt output, +0, -1dB
Signal-to-Noise Ratio Not specified by manufacturer
Total Harmonic Distortion (THD) 0.01% THD at full rated power at 1kHz; 0.05% THD 20Hz to 20kHz
Input Connections 1 x XLR female per channel
Output Connectors Dual banana/binding post terminals
1 x XLR male satelite/remote
1 x Headphone
Controls Front Panel 1 x Rotary input level control
1 x Rotary headphone volume control
1 x Speaker on/off switch
Controls (Rear) Ground lift switch
Indicators 1 x Signal, 1 x Overload LED indicators per channel
Cooling Convection
Power Consumption 130 watts
Dimensions 8 7/16" x 8 1/4" x 1 3/4"
Weight 6 lbs
Specialties Ground lift switch
Packaging Info
Box Dimensions (LxWxH) 11.2 x 10.8 x 2.7"
Furman SP-20AB - Half-Rack Stereo Power Amplifier - 20W per Channel into 8 Ohms (Balanced Connectors)
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