Dunlop MXR M-135 Smart Gate Data Sheet

92503001862 revC

M135 SMART GATE

M135 SMART GATE

DESCRIPTION

• Three selectable noise
reduction ranges

• Reacts gradually to long,
sustained notes and quickly
to short, syncopated notes

• Fast attack time preserves
picking transients and
harmonic overtones

CONTROLS

HI TRIGGER RANGE switch

extends trigger range for
extremely noisy situations

TRIGGER LEVEL knob controls

sensitivity of gate threshold
(indicated by yellow GATE LED)

NOISE BAND CUT switch

selects noise reduction range
(Hiss, Mid, or Full)

FOOTSWITCH toggles effect on/

bypass (red LED indicates on)

POWER

The MXR Smart Gate is powered
by one 9-volt battery (remove

bottom plate to install), a 9-volt
AC adapter such as the Dunlop
ECB003/ECB003E, or a DC Brick
power supply.

DIRECTIONS

• Run a cable from your guitar
to the Smart Gate’s INPUT jack
and run another cable from the

™

Smart Gate’s OUTPUT jack to
your amplifier.

• Set the TRIGGER LEVEL knob
to fully counterclockwise and
use the NOISE BAND CUT switch
to select the noise frequency
range you want to suppress—

• Rotate the TRIGGER LEVEL knob

clockwise until unwanted noise
has completely died out. The

yellow GATE LED will light up

when the gate has engaged.

• If you nd yourself in an extremely

noisy playing situation, push the

HI TRIGGER RANGE switch to
extend the range of the TRIGGER
LEVEL knob.

Hiss for highs, Mid for mids,
and Full for lows.

• Turn the effect on by depressing

the footswitch and play a note or
chord and let it ring out.

SPECIFICATIONS

Input Impedance 1 MΩ
Output Impedance 1 kΩ

Maximum Input Level +7dBV
Maximum Output Level +7dBV

Noise Floor*
Gate Closed -105 dBV
Gate Open

HISS -100 dBV
MID -100 dBV
FULL -96 dBV

Frequency Response

Gate Open +0/-1 dB, 20 Hz to 20 kHz
Gate Closed
HISS -3 dB at 1 kHz

-22 dB at 20 kHz
MID -3 dB at 500 Hz

-23 dB at 20 kHz
FULL -36 dB at 60 Hz

-22 dB at 500 Hz

Which NOISE BAND CUT setting should I use?

Each of the Smart Gate’s noise reduction settings is optimized for specific
input sources. In general, the Hiss setting works well with instruments and
input sources that boost the high frequency range, such as vocal mics,
wind instruments, keyboards, and electric bass. The Hiss setting and the
Mid setting are both effective on instruments with high gain midrange

-23 dB at 20 kHz

Bypass Hardwire

Current Draw 15 mA

Power Supply 9 volts DC

*A-weighted

boosting, such as distorted electric guitars and amplified harmonicas.
The Full setting is most effective when used to quiet input sources with
low-end hum and buzz problems, such as AC line noise, display noise, or
light dimmer noise. To quiet a rack of noisy effects, place the Smart Gate
last in the signal chain, just before the amplifier.

DUNLOP MANUFACTURING, INC.

P.O. BOX 846 BENICIA, CA 94510 U.S.A.

TEL: [phone] FAX: [phone]