mxr 135 SMART GATE User manual

Congratulations on choosing the M-135 MXR Smart Gate pedal!
Like all Dunlop products, this unique effect is designed to give
you quality sound through years of dependable service.
DESCRIPTION
The MXR Smart Gate features independent high and low adaptive filters
and control circuits, which create the most transparent noise suppression
system available today. Whichever noise gate filter cut-off point is selected,
Hiss, Mid, or Full Band, the MXR Smart Gate knows to gate out noise slow-
ly when notes are being held, and quickly when they are stopped short. It
will not cut off the end of notes. The gate’s attack time is extremely fast and
will not degrade picking transients or harmonic overtones. Performance,
road tuff housing, and easy operation make the M-135 Smart Gate live up to
the status of the MXR classics.
POWER
The MXR M-135 Smart Gate uses one 9-volt battery. The battery access is
through the bottom of the pedal. The Smart Gate uses the Dunlop ECB03
Adapter (ECB03E for Europe), a 9-volt DC regulated AC adapter. Plug polarity
is positive on the barrel and negative in the center. Note: Battery must be
installed to operate the Smart Gate unless an AC adapter is used.
M-135 SMART GATE

A
C
B
D
Footswitch toggles Effect On/Bypass (red LED indicates on).
Trigger Level varies the sensitivity of the gate‘s threshold, allowing it to
be adjustable to any input source.
The Gate LED intensity shows level of noise reduction.
Noise Band Cut Switch determines the lowest limit of noise gate filter.
A
B
C
D

DIRECTIONS
• For initial settings, set the Trigger Level to full counterclockwise and the
Noise Band Cut to either Hiss, Mid or Full, depending on the frequency
band of noise you are interested in suppressing.
• Insert a 9-volt battery and/or plug in AC adapter into the MXR Smart
Gate. The MXR Smart Gate pedal will operate on either power source.
• Run a shielded cord from your input source (instrument, effects, record-
ing system, mixer or effect loop send) to the Smart Gate’s input jack
located on the right side of the pedal.
• Run a shielded cord from your amplifier’s input to the Smart Gate’s out-
put jack.
• To switch between Bypass and Smart Gate active, push down then
release the top mounted footswitch. The Status LED will light when the
Smart Gate is active.
• Turn on amplifier and play and sustain a note or chord.
• Adjust the Trigger Level towards the clockwise position until hiss is sup-
pressed before the notes or program material has completely died out.
The yellow LED will light when the gate has engaged.
APPLICATIONS
While the Smart Gate is a “set and forget” type device, some thought
should be given as to which band cutoff frequency points are most effec-
tive in reducing noise with various types of input sources.
In general, the Hiss noise band cut works well with instruments and
input sources that have high frequency boost (vocal mikes, keyboards,
wins instruments, electric bass, etc.). The Hiss/Mid noise band cut is effec-
tive on instruments with high gain midrange frequency boosts (distorted
electric guitar, amplified harmonica, etc.). The Full Band noise cut is most
effective in quieting input sources with low-end hum and buzz problems
(AC line noise, display noise, and noise from light dimmers).
To quiet a rack of noisy effects, place the Smart Gate last in the audio
chain, right before the amplification system.

DUNLOP MANUFACTURING, INC. P.O. BOX 846 BENICIA, CA 94510 U.S.A.
TEL: [phone] FAX: [phone] WWW.JIMDUNLOP.COM
92503001862
SPECIFICATIONS
Input Impedance: 1 Megohm
Input Level: 2Vrms (+6dBV) max
Output Impedance: <1Kohm
Signal to Noise: CLOSED:106dBV A weighted (Vref 1V RMS)
OPEN: HISS >100dBV A weighted (Vref 1V RMS)
MID >100dBV A weighted (Vref 1V RMS)
FULL >96dBV A weighted (Vref 1V RMS)
Frequency Response: BYPASS:20Hz to 10Khz +0dB/-.1dB
NOISE CUT “OFF” (ALL MODES):20Hz to 20kHz ±1dB
NOISE CUT “ON”: HISS -3dB at 1kHz
-20dB at 15kHz
-25dB at 20kHz
MID -3dB at 500Hz
-30dB at 20kHz
FULL >-30dB at 60Hz
-15dB at 500Hz
-25dB at 20Hz
Power Draw: 15 Milliamps
Power Requirement: 9VDC adapter with 5.5mm x 2.1mm positive barrel
and negative center or standard 9 Volt battery