SWR Sound Bass Combo Amplifier - Manual (Page 5)

Frequency Response (power amplifier)
–3dB @ 20 Hz and 40 kHz
Sensitivity (full output under clipping, 8 ohms load, 100 Hz)
Passive Input Jack: 38 millivolts
Active Input Jack: 60 millivolts
Power Amplifier (Effects Return Jack “in”): 5 volts
Input Impedance
Passive/Active Input: 800k Ohms
Active Input: 60k Ohms
Effects Return: 27k Ohms
Output Impedance
Effects Send: 100 Ohms
Tuner Send: 100 Ohms
XLR (Balanced) Out: 750 Ohms
Signal To Noise Ratio
–72 dB (<10 millivolts typical)
Equivalent Input Noise
9 microvolts
Dimensions
23" W x 25-7/8" H x 18-3/8" D
Weight
95 lbs.
BLACK BEAUTY – GETTING STARTED
Remove the AC cable from the accessory pack and connect it from the amplifier to a standard wall outlet.
Make sure that the “Gain” and “Master Volume” controls are set to the minimum position (fully
counter-clockwise). Locate the power switch on the right side of the front of the unit and turn the amplifier
on. Upon powering up, don’t be surprised if you hear a small pop. This is absolutely normal and will not cause
damage to your speaker system.
(Eliminating this “power on transient” would require a component called a relay. SWR chose not to
incorporate this type of component due to the fact that relays degrade signal quality and often fail, causing
the unit to have no output and requiring a trip to a local service center. If you wish not to hear the pop upon
power up, locate the “Speaker On/Off” switch on the rear panel and set it to “Off” before you turn the unit
on. Be sure to remember to set the switch back to “On” afterwards, or you may find yourself wondering why
you don’t hear anything.)
Plug your instrument into the desired input jack (refer to “Front Panel Features” for greater detail). Turn your
instrument’s volume up to at least 75% of maximum and slowly adjust the gain control. Once you begin to
play your instrument and you see the red light (marked “preamp clip”) over the gain control illuminate, back
off the gain a bit. Now turn up the “Master Volume” and you should hear the sound of your instrument
amplified through the Black Beauty. For more detailed information, please read the entire manual carefully so
that you can fully realize the potential of the your new Black Beauty.
For those who wish to use an extension speaker cabinet with the Black Beauty, please skip ahead to
“Extension Speaker Output Section” on page 12.
BLACK BEAUTY OWNER’S MANUAL • 3