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.
|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|