SWR Sound SM-1500 - Manual (Page 9)


AA . BALANCED LINE OUTPUT— A fully featured, true electronical-
ly-balanced XLR jack for output to studio and live performance
mixing consoles.
BB . 0° / 180°— Press to reverse the polarity of the Balanced Line
Out jack; useful for reducing phasing problems that may occur
when playing in locations with non-standard wiring or when
combining Line Output with miked cabinet signal. Normally,
leave this switch out.
CC . GROUND / LIFT— Disconnects the ground connection (pin-1)
from the Balanced Line Out jack to reduce ground loop noise
generated from non-standard wiring. Normally, leave this
switch out.
DD . LEVEL— Adjusts the output level of the Balanced Line Out jack
to accommodate a variety of sound equipment connections
and input sensitivities.
EE . DIRECT / COMPRESSOR OUTPUT / LINE— Choose the point
in the signal path to connect the Balanced Line Out jack. See
Block Diagram on page 11.
• Direct (Pre)—Just after the first stage–no EQ. Most like a Tube
D.I. (direct box).
• Comp Output—Depends on the Comp Position switch {J}.
Always post Gain and Aural Enhancer, but either pre or post
Bass Intensifier and EQ circuits.
• Line (Post)—After all preamp circuits, including Boost and
Effects. Not affected by Master Volume {Y}.
FF . EFFECTS LOOP— TRS1 multipurpose jacks—Send provides a
preamp output and includes onboard tone shaping. Output
level is primarily controlled by Gain {Q}. Effects Return (wet)
signals are mixed with the onboard preamp (dry) signal in any
ratio set by the Effects Blend control {X}. Effects Loop can be
bypassed from the footswitch.
The effects loop on the SM-1500 is located on a "side chain"
circuit, a design used in studio equipment to isolate the effects
from the main circuit. This provides the full sound of your
instrument AND allows the diversity of your external effects to
come through. The effects circuit is also located after the gain
stages in the preamp signal path to bypass the noise associated
with effects inline before the preamp.
• Effects Devices: Connect Send to your effects device input and
the effect's output(s) to the Left/Mono Return (mono effects)
or both Return jacks (stereo effects). NOTE: On your effects
device—set any wet/dry control fully to WET to prevent phas-
ing problems and set any input level control to +4dB (or 0dB if
the unit is being overdriven). NOTE: Stereo effects are automati-
cally summed to mono in Bi-amp and Bridge modes.
• Multiple Amplifiers: For additional output, you can connect
an auxiliary power amp to your SM-1500’s Effects Send output
(Gain on your SM-1500 will affect the volume levels of both
amplifiers). NOTE: If you wish to use an SWR® amp as an auxil-
iary power amp, use Mono Effects Return as the input and turn
the Effects Blend control to the maximum WET position.
• Accompaniment: Connect a CD player or drum machine to
either the Mono Return or both Stereo Return jacks. Adjust
accompaniment volume from the device and with the Effects
Blend control {X}.
GG . LOW OUT— TRS1 line level, 1/4" output. Supplies low frequen-
cies; useful for connection to an external power amplifier in a
bi-amp configuration. NOTE: This output is always active, inde-
pendent of the positions of the mode switches {HH and PP}.
HH . STEREO / BI-AMP— Selects a core mode of operation for the
SM-1500 power amplifiers—when not in Bridge mode {PP}:
• Stereo Mode—The power amplifiers operate separately as left
and right channels. In Stereo Mode, use both Volume knob {Y}
sections as labeled ("Left" and "Right").
• Bi-Amp Mode—The power amplifiers operate separately as
low– and high–frequency channels. In Bi-Amp Mode, use both
Volume knob {Y} sections, "Right" for low frequencies and "Left"
for high frequencies. (Stereo effects will be summed to mono.)
Rear Panel