POWER 750 OWNER’S MANUAL SWR • CORONA, CA • USA
IMPORTANT SAFETY INSTRUCTIONS CAUTION: TO REDUCE RISK OF ELECTRIC SHOCK, DO NOT REMOVE THE COVER OR BACK. NO USER-SERVICEABLE PARTS INSIDE. PLEASE REFER TO A QUALIFIED SERVICE TECHNICIAN. A. Read Instructions: All safety and operation instructions should be read before the product is operated. B. Retain Instructions: The safety and operating instructions should be retained for future reference. C. Heed Warnings: All of the warnings on this product and in the operating instructions should be adhered to. D.
INTRODUCTION Congratulations on your purchase of the SWR Power 750! You now own one of the meanest, toughest and loudest power amps ever made specifically for bass guitar. Bassists have a unique burden when it comes to power, because it takes considerably more power to amplify lower frequencies than it does for higher ones.
750 Watts @ 4 ohms 450 Watts @ 8 ohms (minimum load = 2.6 ohms) INPUT IMPEDANCE: Balanced = 10K ohms Unbalanced = 33K ohms OUTPUT IMPEDANCE: Slave Output = 100 ohms SENSITIVITY: 1.582 VRMS LOAD CAPABILITY: 2.6 ohms to infinity NOISE: Residual = <.00072 volts (720 millivolts) Signal to noise ratio = <-100 dB DISTORTION: < .026% THD, 1 kHz @ 8 ohms < .13% THD, 20 Hz to 20 kHz @ 8 ohms Intermodulation Distortion = .
USING TWO SPEAKER CABINETS Connect the speaker cables of your choice (1/4" or Speakon) from the speaker out jacks on your Power 750 to the inputs on speaker cabinets. Can you use one 1/4" output jack and a Speakon output jack at the same time? Yes. Remember, all of the Speaker Outputs are coming off of the same mono power amp inside the unit. If the cabinets are the same impedance, the same amount of power will be sent to each enclosure.
FRONT PANEL FEATURES RACK HANDLES The rack handles were chosen for comfort while carrying your Power 750 from place to place. They will also protect the front panel controls in the event the unit is dropped on its face. In some types of racks, the handles may need to be removed before installation. This is easily done by removing the four screws holding them to the front panel. VOLUME CONTROL The Volume control affects the amount of signal driving the power amplifier.
GROUND LIFT A ground lift is provided for the Balanced Inputs. In the normal (out) position of the push switch, Pin 1 on the XLR connector is grounded. In the Lift (in) position, the ground on Pin 1 is disconnected. When using the Balanced Inputs, always be aware of the position of the ground lift switch. This function only affects the Balanced Inputs and does not affect the Unbalanced Inputs.
Here's another formula: To figure out the total impedance of two or more cabinets of equal value hooked up in parallel, divide the impedance of one cabinet by the number of cabinets: Impedance of one cabinet / number of cabinets = total impedance (For an even more in-depth discussion of impedance and power rating issues, go to the SWR Website at www.swrsound.
SPEAKER CABLE The speaker cable you use to connect your SWR system should be made of at least 18 gauge wire, and heavier if possible. (The thicker the wire, the lower the gauge, so 18 gauge is heavier than 20 gauge, 16 gauge is better than 18 gauge, and so on.) DO NOT use instrument cables to hook up your speakers. This can result in intermittent power loss, cause the power amp to oscillate and damage itself and/or your speakers, and render the cables useless for any purpose.
RACK MOUNTING INSTRUCTIONS To preserve the beauty and reliability of your amplifier, we recommend that you install your amplifier in a rack case. The Power 750 is completely ready to be rack mounted and needs no additional parts or accessories other than the rack screws and the case itself. The Power 750 takes up three full rack spaces (5").
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POWER 750 LIMITED WARRANTY The POWER 750 from SWR is warranted to the original consumer purchaser for TWO YEARS from the date of purchase against defects in materials and workmanship, provided that it is purchased from an Authorized SWR dealer. This warranty applies only to products purchased in the USA or Canada.
