
M300 REVERB
M300 REVERB
DESCRIPTION
• Six meticulously crafted reverbs 
in one pedal
• Audiophile quality analog and 
digital audio paths
• Dry path is 100% analog
• Studio-grade low noise oor
• Trails Bypass mode lets eect 
ring out after turning the pedal o
• Expression pedal jack for foot 
control of all knob settings
• Stereo In/Out capability when 
using TRS cables
CONTROLS
EXP output allows blending 
1
of two setting congurations 
with an expression pedal 
(not included)
FOOTSWITCH toggles eect on/
2
bypass (blue LED indicates on)
LED column indicates selected 
3
reverb style
DECAY knob sets length of 
4
reverb decay
TONE knob shapes EQ of eect 
5
(or octave blend for PAD setting) 
and selects reverb style
MIX knob sets reverb signal level
6
POWER 
The MXR Reverb requires 9 volts 
(240mA) and can be powered 
by the included Dunlop 
ECB003/ECB003EU adapter 
or the Iso-Brick™ Power Supply. 
This pedal cannot be powered 
by a battery.
DIRECTIONS
• Run a standard instrument cable 
from your guitar to the M300’s 
INPUT jack and another cable 
from the M300’s OUTPUT jack to 
your amplier. If using an expression pedal, run a TRS cable from 
the M300’s EXP jack to your 
expression pedal. 
• Start with all controls at 
12 o’clock. 
• Turn the eect on by depressing 
the footswitch.
• Push in the TONE control to 
6
cycle through reverb styles, 
indicated by red or green LEDs 
in the LED column. See REVERB 
STYLES section for a description 
of each style.
SAMPLE SETTINGS 
MEMPHIS GRITS TRANCE SYLVANIABIG KAHUNA
• Rotate DECAY control clockwise to increase length of reverb 
decay or counterclockwise to 
decrease it.
• Rotate TONE control clockwise 
for a brighter reverb sound or 
counterclockwise for a warmer 
reverb sound.
• Rotate the MIX control clockwise 
to increase reverb signal level 
or counterclockwise to decrease 
it. Fully clockwise results in an 
equal 50/50 mix of reverb and 
dry signals.
NOTE : 
You may notice that the M300’s 
housing warms up while on. This is 
completely normal. Take care when 
operating in extremely high ambient 
temperatures or direct sunlight.
REVERB STYLES
• PLATE: Classic studio plate  
reverb. Indicated by green LED.
• SPRING: Classic guitar amp 
reverb. Indicated by red LED. 
• EPIC: Multiple interconnected 
modulated delays. Indicated by 
green LED.
• MOD: Modulated studio plate  
reverb. Indicated by red LED.
• ROOM: Simulates small room, 
early reection slap-back sound. 
Indicated by green LED.
• PAD: Blend of octave down 
and octave up synth sounds 
with reverb eect. Indicated by 
red LED. Use TONE control to 
blend—fully counterclockwise 
provides one octave down and 
fully clockwise provides one 
octave up. The 12 o’clock 
position provides both an octave 
up and an octave down. Use 
DECAY control to set synth pad 
and reverb decay.
DIAGRAM A
MONOSTEREO
USING AN EXPRESSION PEDAL
An expression pedal such as the 
DVP4 Volume (XL) 
the DVP3 Volume (X)™ Pedal can be 
used to toggle and sweep between 
two dierent setting congurations:
• Connect an expression pedal to 
M300’s EXP jack using a TRS 
cable, and set rocker to its heeldown position. Adjust 
knobs as desired. Note:  
Expression pedal cannot be 
used to change reverb style.
• Move rocker to its toe-down 
position. Adjust knobs 
as desired to a dierent 
setting conguration.
• Moving rocker back and forth 
will move eect sound smoothly 
between those two settings.
STEREO MODE 
The M300 can be run in either 
Mono (default) or Stereo modes, 
selectable via internal switch, 
which determines tip/ring input 
connection. For a stereo setup, 
run a TRS splitter cable to the 
M300’s INPUT jack and another 
from the M300’s OUTPUT jack to 
your amplier. Next, set internal 
STEREO/MONO switch to its LEFT 
position (see Diagram A). Note:  
When M300 is bypassed, output 
ring connection will only receive 
™
 Mini Pedal or 
signal if M300 is set to Trails 
Bypass mode (see below).
ADVANCED FUNCTIONS – 
STARTUP MODE
Additional functions can be 
accessed by entering Startup 
Mode. Advanced function settings 
will remain in selected state, even 
after pedal is powered o. Re-enter 
Startup Mode and follow relevant 
steps to change settings again.
1. Disconnect M300 from power 
supply and set DECAY and MIX 
controls to 12 o’clock.
2. Enter Startup Mode by pushing 
down and holding TONE knob 
while connecting M300 to its 
power source.
TRAILS BYPASS MODE
The M300 uses a “true bypass” 
relay by default, shutting o eect 
and hardwire bypassing the tip 
connection signal as soon as you 
turn the pedal o (ring connection uses buered bypass). The 
M300 can also be operated using 
Trails Bypass mode, which uses 
a buered bypass and allows the 
reverb eect to ring out even after 
you turn the pedal o.
1. After entering Startup Mode, 
release TONE knob. LED column 
will now reect bypass mode 
status. Green LEDs indicate 
factory-set True Relay Bypass 
mode, while red LEDs indicate 
Trails Bypass mode.
2. Press TONE knob to toggle 
between modes.
3. Depress footswitch to exit 
Startup Mode and resume 
normal operation.
WET MODE
The M300 can be set so that 
only the wet signal is sent to 
your amplier.
1. After entering Startup Mode, 
observe LED column for mode 
status. Green LEDs indicate 
factory-set Dry mode. Red LEDs 
indicate Wet mode.
2. While still pushing down on  
TONE knob, rotate DECAY or 
MIX knob clockwise past 12 
o’clock to select Wet mode, 
indicated by red LEDs. To return 
to Dry mode, rotate DECAY or 
MIX knob counterclockwise past 
12 o’clock. Green LEDs will light 
up and red LEDs will turn o.
3. Release TONE knob to save your 
selection and depress footswitch 
to exit Startup Mode and resume 
normal operation.

END-USER LICENSE  
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SPECIFICATIONS 
Input Impedance  1 MΩ 
Output Impedance  100 Ω  
Max Input  +5 dBV 
Max Output Level  +5 dBV 
Noise Floor  -107 dBV  
Sampling Rate  96 kHz
Current Draw  240 mA 
Power Supply  9 volts DC 
Note: This equipment has been 
tested and found to comply with 
the limits for a Class B digital 
device, pursuant to Part 15 of the 
FCC Rules. These limits are 
designed to provide reasonable 
protection against harmful interference in a residential installation. 
This equipment generates, uses 
and can radiate radio frequency 
energy and, if not installed and 
used in accordance with the 
instructions, may cause harmful 
interference to radio communications. However, there is no 
guarantee that interference will not 
occur in a particular installation. If 
this equipment does cause harmful 
interference to radio or television 
reception, which can be determined 
by turning the equipment o and 
on, the user is encouraged to try to 
correct the interference by one or 
more of the following measures:
• Reorient or relocate the 
receiving antenna.
• Increase the separation between 
the equipment and receiver.
• Connect the equipment into 
an outlet on a circuit dierent 
from that to which the receiver 
is connected.
• Consult the dealer or an experi-
enced radio/TV technician 
for help.
This device complies with Part 15 
of the FCC Rules. Operation is 
subject to the following two conditions: (1) This device may not cause 
harmful interference, and (2) this 
device must accept any interference received, including interference that may cause undesired 
operation.
Unauthorized changes or modications to this product could void 
the user’s authority to operate the 
equipment.
DUNLOP MANUFACTURING, INC. 
P.O. BOX 846 BENICIA, CA 94510 U.S.A. 
TEL: 1-707-745-2722 FAX: 1-707-745-2658
92503016638REVD