User manual FURMAN SP20AB

[. . . ] The latter mode allows a power output of 40 watts provided the load is 8 or more ohms. The SP-20AB is housed in a half single-space rackmount chassis. The SP-20AB can be Introduction mounted in a 19" rack by using the Furman HRKIT-1 rack mounting kit or side by side Congratulations on your purchase of a with another SP-20AB using the HRKIT-2 rack Furman Model SP-20AB you have chosen an mounting kit. extremely versatile general purpose power amplifier. [. . . ] MODE SWITCH: This three position slide switch determines the SP-20AB's mode of operation The three choices are: MONO: This position is also referred to as "Dual Mono" because while both channels are operating separately (each driving its own speaker), there is only one input, which appears at both outputs. The input must be connected to the "Left/Mono Input" jack. STEREO: This position is for normal stereo operation, where there are two inputs (left and right) and two outputs. BRIDGED: This position should be used for straight mono operation, when there is only one input (plugged into the "Left/Mono Input" jack) and all the SP-20AB's power is to be concentrated into one output. Note that under some circumstances, this can amount to more than double the rated 20 watts pet channel for stereo . - to as much as 50 watts. Therefore, in bridged mode, for adequate protection, the speaker connected should be able to handle approximately 100 watts without damage. See "SPEAKER OUTPUTS" below for details of how to connect the speaker. SPEAKER OUTPUTS: These outputs should be used for driving speakers. The connections are via multiple-use terminals, which can accommodate either dual banana plugs, bare wires, or wires terminated in spade lugs. For stereo or dual mono operation, connect one speaker to the left pair of terminals and the other speaker to the right pair. Observe proper polarity - make sure that the wire connected to the top (red) terminal on the left channel connects to the red terminal of the left speaker, and that the wire connected to the top (red) terminal on the right channel connects to the red terminal of the right speaker. If the wires to one speaker are reversed, the speakers will be of opposite polarity (or "out of phase"), and a severe loss of low frequencies may, result. If Mono Bridged operation is desired, the single speaker must be connected to the 4 USE FOR BRIDGED SP-20AB MANUAL two top (red) terminals. In this case, nothing other applications. The HR-2 units are compact should be connected to the bottom (black) boxes which easily attach with a thumbscrew terminals. Positive polarity will be on the left to any microphone stand Each HR-2 has two channel (red) terminal. stereo volume controls and two headphone SATELLITE/REMOTE OUTPUT: This output jacks. There are also two XLR connectors, one is a single male XLR connector containing male and one female. These may be used to both the left and right channel outputs. It is "daisy chain" HR-2 boxes together with standard wired as follows: Pin 3 -left (high); Pin 2 - microphone cables. right (high); and Pin 1 - low, common to both Begin the chain at the SATELLITE/REMOTE channels. This output should be used as the connector on the rear of the SP-20AB, as shown starting point for a chain of HR-2 Remote in the above diagram. [. . . ] Also, please enclose a note giving your name, address, phone number and a description of the problem. NOTE: All equipment being returned for repair must have a Return Authorizatilon (RA) Number. To get an RA Number, please call the Furman Service Department: (707) 763-1010. Please display your RA Number prominently on the front of all packages. 8 SP-20AB MANUAL SPECIFICATIONS OUTPUTS: Power: Connectors: 20 Watts per channel, stereo, into either 4 Ohms or 8 Ohms, or 40 Watts mono into 8 Ohms, 20 Hz to 20 KHz Speakers: 5-way binding posts (accommodates dual banana plugs, spade lugs, bare wires, etc. ) Remote Headphone: XLR. [. . . ]