Front Panel - SWR SM-1500 Owner's Manual

Bass Intensifier
Mute Pad Level
MIN MAX 80
-10 dB
1
Preamp
Clip Gain
Input
Select
2
MIN MAX MIN
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A . INPUTS— Plug into either (or both) of the input jacks using a
shielded instrument cable. Press Input Select to choose either
input 1 or 2 to be the active jack as indicated by the LEDs.
The rear panel In jack {LL} can be used instead of input 1 on the
front panel; useful for connecting wireless receivers. NOTE: If
both of these jacks are used at the same time, the front panel
jack overrides the rear panel jack.
• TIP: To overdrive the first tube stage of the preamp, connect
an external preamp inline between your instrument and the
input. For the best pure-tube overdrive sound, boost the out-
put of your external preamp, then dial in a clean Gain setting
using the PreAmp Clip LED {P}. (The Preamp Clip LED does
not monitor the very first preamp tube stage to allow you to
isolate it and overdrive it independent of the Gain controlled
stage of the preamp.)
B . MUTE— P ress in to disable all output from the unit, except
Tuner Out {KK}; useful when switching or tuning instruments or
during breaks.
C . PAD— P ress in to reduce input sensitivity by –10dB; useful for
cleaner response from high-output instruments.
D . BASS INTENSIFIER— P ress in to engage the Bass Intensifier
circuit as indicated by the LED. The Bass Intensifier boosts
a chosen set of low frequencies combined with a smooth,
fast-acting compressor, providing radical boosts without
overdriving the amplifier; useful for heavier sections of a tune.
Bass Intensifier can also be engaged from the footswitch.
E . LEVEL— A djusts the strength of the Bass Intensifier effect.
F . CUTOFF— L imits the frequency range that the Bass Intensifier
operates in from below 80Hz to below 200Hz.

Front Panel

Cutoff Threshold Ratio
-5 +5 2 : 1
200 -10 +10 1 : 1
PRE EQ
Aural
Enhancer Bass Mid 1
80 95
45 120
35 180
-15 +15
MAX -15 +15
Mid 1
1 / 2
80 95
EQ
45 120
Select
35 180
-15 +15
1 + 2
Compression
Attack Release
Comp
10 : 1 Position
20 : 1 MIN MAX MIN MAX
POST EQ
Equalization 1
Mid 2 Mid 3 Treble
450 530 2.3k 2.8k
250 650 1.3k 3.4k
180 1k 1k 5k
-15 +15 -15 +15
-15
Equalization 2
Mid 2 Mid 3
450 530 2.3k 2.8k
250 650 1.3k 3.4k
180 1k 1k 5k
-15 +15 -15 +15
Footswitch
Freq Level
G . COMPRESSION— P ress in to engage the Compressor circuit
as indicated by the LED. Compression moderates signal level
as it peaks, according to the way you have controls {H, I, K and
L} set.
H . THRESHOLD— S ets the signal level at which Compression
engages. Turn fully counter-clockwise for maximum sensitivity.
Note that Gain {Q} level and instrument output are what actu-
ally trigger the Compressor.
I . RATIO— A djusts how much compression is applied once it
has been triggered. For example, at 1:1 there is no compres-
sion. With a ratio of 2:1, an increase of 10 dB will be needed to
increase the output signal level by 5 dB over the threshold. At
10:1, an increase of 10 dB will only increase the output signal
level by 1 dB. (Many consider ratios of 10:1 and greater to be
hard limiting.)
J . COMP POSITION— P ress to alternate the position of the
Compressor circuit in the signal path from before most of the
tone shaping controls to after, as indicated by the LEDs. See
Block Diagram on page 11.
K . ATTACK— A djusts the rate that Compression engages once
the the signal level rises above the threshold; useful for fine
tuning the transparency of the Compressor effect.
L . RELEASE— A djusts the rate that Compression disengages
once the signal level drops below the threshold; useful for fine
tuning the transparency of the Compressor effect.
M . METER— F our LEDs indicate the actual amount of gain reduc-
tion in dB.
Boost
-2
-4
-8
-18
MIN MAX
Effects
Left Right
Blend Volume
SM -1500
+15 DRY WET MIN MAX
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ON
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Power