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SWR SWR 750x Bass Amplifier 750x - page 1
750x OWNER’S MANUAL SWR • CORONA, CA • USA ...
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SWR SWR 750x Bass Amplifier 750x - page 2
IMPORT ANT SAFETY INSTRUCTIONS CAUTION: TO REDUCE RISK OF ELECTRIC SHOCK, DO NOT REMOVE THE COVER OR BACK. NO USER-SERVICE- ABLE P ARTS INSIDE. PLEASE REFER TO A QUALIFIED SERVICE TECHNICIAN. A. Read Instructions: All safety and operation instr uctions should be read befor e the product is operated. B. Retain Instructions: The safety and operating ...
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SWR SWR 750x Bass Amplifier 750x - page 3
INTRODUCTION Congratulations on your pur chase of the SWR 750x Bass Amplifier! Y ou now own a killer combination of massive power , easy-to-use contr ols, simply integrated onboar d ef fects… and pur e SWR tone. A little histor y: The SWR 750x is an upgraded version of the Bass 750, a model we’ve of fer ed since 1999 in response to demand for a ...
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SWR SWR 750x Bass Amplifier 750x - page 4
750x – FRONT P ANEL FEA TURES • Dual independent input jacks compatible with both passive and active instr uments • Preamp Gain contr ol w ith r ed LED clip indicator • Aural Enhancer contr ol • O ver drive Activator Switch (illuminated r ed when engaged) • Ov er drive “Drive” Contr ol • Over drive Level Contr ol • SubW ave ™ ...
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SWR SWR 750x Bass Amplifier 750x - page 5
Frequency Response (power amplifier) (@ 850 watts RMS) –3dB @ 20 Hz and 40 kHz Sensitivity (full output under clipping, 8 ohms load, 100 Hz) Passive Input Jack: 62 millivolts Active Input Jack: 267 millivolts Power Amplifier (Ef fects Retur n Jack “in”): 5 volts Input Impedance Passive/Active Input: 800k Ohms Active Input: 60k Ohms Ef fects R ...
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SWR SWR 750x Bass Amplifier 750x - page 6
Impor tant: The minimum total impedance when operating the 750x is 2.6 ohms. This means you can safely use: a) A single 8 ohm cabinet b) A single 4 ohm cabinet c ) T wo 8 ohm cabinets (total: 4 ohms) d) One 8 ohm cabinet and one 4 ohm cabinet (total: 2.6 ohms) ** e) T hr ee 8 ohm cabinets (total: 2.6 ohms) ** **Running the amplifier constantly at 2 ...
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SWR SWR 750x Bass Amplifier 750x - page 7
when tr ying this, make sure the Pr eamp Clip LED is not activated. If this occurs, tur n down your Gain control until the LED does not light. The first pr eamp tube stage is NOT monitored by the pr e- amp clip circuit for this r eason. Active Input Jack The Active input jack should be used with instr uments having a built-in (on boar d) pr eamp or ...
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SWR SWR 750x Bass Amplifier 750x - page 8
This r emains tr ue up to about the “2 o’clock” position. This position—a favorite for many users—brings out both the low end fundamentals and crisp highs and, at the same time, adds a little lower midrange to help cu t th r ough the band. However, if you go fur ther clockwise and past the 2:00 position, selected mids will star t to dr op ...
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SWR SWR 750x Bass Amplifier 750x - page 9
tion with the level of the clean “Channel One.” How do you contr ol the level of “Channel One?” By using the Gain Contr ol, which contr ols the level of the clean bass signal in the pr eamp. Also, the EQ Contr ol s ar e located after the Over drive cir cuitr y , s o they can have a drastic ef fect o n th e distor ted tone. (The tr eble cont ...
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SWR SWR 750x Bass Amplifier 750x - page 10
8 • 750x OWNER’S MANUAL Pull Turbo Pulling the Bass Contr ol knob to the “out” position widens the bandwidth of the bass contr ol, and changes the center-point fr equency fr om 8 0 H z to 40 Hz. It has the ef fe ct o f mo r e clearly enunciating fr equencies down to 30 cycles (low “B” on a five string bass). Often these notes can be fel ...
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SWR SWR 750x Bass Amplifier 750x - page 11
750x OWNER’S MANUAL • 9 The Ef fects Blend cir cuit is similar to that used on r eco r ding consoles with the ef fe cts l oop on a “side chain” to the nor mal cir cuit. Unless the contr ol is set to the full “wet” position, you will always get the full sound of your instr ument AND get the diversity an ef fects unit of fers. This cir cu ...
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SWR SWR 750x Bass Amplifier 750x - page 12
Power On/Of f Switch Th is sw it ch tu r ns the complete unit on or of f. Setting the switch upwar ds to the “On” position tur ns on the unit, and the switch itself will illuminate in r ed. Setting the switch downwar ds to the “Power” position will t u r n the unit of f, and the r ed light inside the power switch will tur n of f as well. 75 ...
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SWR SWR 750x Bass Amplifier 750x - page 13
W iring for the XLR jack at the Balanced Output is as follows: Pin 1 = gr ound, Pin 2 = + (plus), Pin 3 = – (minus) (American Standar d ) Note: T ur n of f transients appear at the Balanced Output when the amplifier is shut down. We rec- ommend that equipment being used in conjunction with the Balanced Output be tur ned down, of f, or disconnecte ...
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SWR SWR 750x Bass Amplifier 750x - page 14
The Ef fects Loop is compatible with most individual or multi-ef fect exter n a l e f fects devices. Many ef fects devices on the market have input level adjustments. For instance, some units have a switch that you can set for either –20 dB or +4 dB. In all cases, these should be set for 0 dB (if available) or +4 dB. The level going to your ef fe ...
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SWR SWR 750x Bass Amplifier 750x - page 15
Preamp Out This jack provides another audio output, but it is located later in the signal chain than the Ef fects Send jack. This signal is post-EQ AND post-ef fects loop, but still befor e (pre) the Master V olume contr ol. Y ou should use this jack when using an ef fects device in the ef fects loop and wish to achieve: 1. A line level output for ...
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SWR SWR 750x Bass Amplifier 750x - page 16
Unlike power amps, ever y speaker cabinet has a pr e-deter mined impedance rating measur ed in “ohms.” In most cases this rating is either 4 or 8 ohms (though ther e may still be some old 2 ohm cr eakers out ther e) . The higher the impedance of the speaker cabinet, the mor e r esistance to power it will of fer . The lower the resistance of the ...
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SWR SWR 750x Bass Amplifier 750x - page 17
750x Power Deliver y Capabilities (Power Ratings) Aft er det er mining how the number of cabinets you wish to r u n af fects the total operating impedance, you need to take into account the power handling capabilities of your speaker cabinets as compar ed to what the 750x can deliver at that impedance. Those ratings ar e as follows: 850 W atts @ 2. ...
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SWR SWR 750x Bass Amplifier 750x - page 18
Recommended single SWR Speaker enclosur es for use with the 750x include: • Megoliath 8x10 • Goliath Senior 6x10 • Big Ber tha 2x15 • Henr y The 8x8 • 12-Stack 4x12 • Workingman’s T ower 8x10 Recommended SWR Speaker combinations for use with the 750x include (all ar e 8 ohm models): • (2) Goliath III 4x10s • (2) 12-Stack 4x12s • ...
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SWR SWR 750x Bass Amplifier 750x - page 19
RACK MOUNTING INSTRUCTIONS T o preser v e the beauty and reliability of your amplifier, w e recommend that you install your amplifier in a rack case. The 750x is completely r eady to be rack mounted and needs no additional par ts or accessories other than the rack scr ews and the case itself. The 750x takes up thr ee full rack spaces. If the rack i ...
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SWR SWR 750x Bass Amplifier 750x - page 20
750x LIMITED W ARRANTY The 750x fr om SWR is war ranted to the original consumer pur chaser for TWO YEARS fr om the date of pur chase against defects in materials and workmanship, pr ovided that it is pur chased fr om a n Authorized SWR dealer . This war ranty applies only to pr oducts pur chased in the USA or Canada. This war ranty is VOID if the ...
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