Input Jacks - SWR SM-500 Bedienungsanleitung

250 watts @ 4 Ohms
150 watts @ 8 Ohms
(minimum load = 4 Ohms)
FREQUENCY RESPONSE (power amplifier): 10Hz to 40kHz
SENSITIVITY (full output under clipping, 8 ohms load, 100Hz):
Passive Input Jack: 38 millivolts
Active Input Jack: 155 millivolts
Power Amplifier (Effects Return Jack "in"): .5 volts
INPUT IMPEDANCE:
Passive/Active Input: 800kohms
Active Input: 60kohms
Effects Return: 27kohms
OUTPUT IMPEDANCE:
Effects Send: 100 ohms
Tuner Output: 100 ohms
XLR Balanced Out: 750 ohms
SIGNAL TO NOISE RATIO: –72 dB (<10 millivolts typical)
EQUIVALENT INPUT NOISE: 9 microvolts
SIZE (measured from the rack ears back): 19" W x 3.5" H x 13.375" D (82.6 x 8.9 x 39.73 mm)
WEIGHT: 20 lbs. (9.07 kg)
SM-500 FRONT PANEL FEATURES

INPUT JACKS

Both input jacks accept a standard 1/4" phone plug and both inputs can be used at the same
time. Since the two inputs are totally independent, no loss in volume or tone will occur if two
instruments are used simultaneously. Please keep in mind, however, that the Active/Passive input
has five times more gain than the Active input.
PASSIVE/ACTIVE INPUT
A "passive" instrument has no built-in preamp and does not use a battery. On the other hand, an
"active" bass utilizes a battery operated preamp, either for gain, tone controls, or both. Although
labeled "passive," the Passive input jack will work with all instruments having a maximum output
of less than 1 volt RMS. Generally speaking, try the Passive input jack first. If you hear a small
amount of distortion and the preamp clip LED is not activated, try using the Active input jack.
Note: If you want to overdrive the first TUBE stage, this can be accomplished by using an external preamp
between your instrument and the Passive input. To obtain optimum sound when trying this, make sure the preamp
clip LED is not activated. If this occurs, turn down your Gain control. The first preamp tube stage is NOT monitored
by the preamp clip circuit for this reason.
8 • SM-500