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Furman Sound

Furman Sound SP-20AB Half-Rack Stereo Power Amplifier, 20W Per Channel into 8 Ohms

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About the Furman Sound SP-20AB

The Furman Sound 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.

Furman Sound SP-20AB Features

  • 20 watts per channel in stereo mode (requires load of 8 ohms)
  • Toroidal transformer for ultra-quiet performance
  • May be bridged for 30 watt mono operation (requires load of 16 ohms)
  • Front panel headphone jack with volume control
  • Ideal for small speakers or headphone system
  • Speaker on-off switch
  • Overload and signal-present LED's for each channel
  • Power-on indicator
  • Ground lift switch
  • Provision for remotely located headphone volume controls

Furman Sound SP-20AB Specifications

Power 20 watts per channel, stereo, into 8 ohms, or 30 watts mono into 16 ohms, 20 Hz to 20 KHz
Connectors Speakers: 5-way binding posts (accommodates dual banana plugs, spade lugs, bare wires, etc.)
Remote Headphone: XLR, balanced
Input Impedance 20K ohms
Sensitivity -1.9 dBu (625 mV) required for full output into 8 ohms
Distortion .01% THD at full rated power at 1 KHz; .05% THD 20 Hz to 20 KHz
Dynamic Range Greater than 99 dB
Frequency Response +0, -1 dB from 20 Hz to 20 KHz, 1 watt output
Dynamic Headroom 2 dB, stereo, measured with 10 ms toneburst at 1 KHz, 1% duty cycle
Power Requirements 120 VAC, 60 Hz, 130 watts
Dimensions (H x W x D) 1.75" x 8.45" x 8.25" / 4.44 x 21.4 x 20.9 cm
Weight 9 lbs / 4.08 kg
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