Rane MH 4 User Manual

OPERATORS MANUAL

HEADPHONE AMPLIFIER

MH 4

QUICK START

Conect the output from any stereo source such as a mixer or tape deck, and plug the left and right inputs into the
respective INPUT jacks. The Inputs accept balanced or unbalanced sources. Just plug them in. This source is now routed to
each of the four Outputs.

For a single mono source feeding all headphones, connect it to either one of the INPUT jacks and engage the STEREO/
MONO switch. Set the CHANNEL LEVEL controls for individual headphone levels.

Never connect anything except a Rane power supply to the thing that looks like a telephone jack on the rear of the
unit. This is an AC input and requires special attention if you do not have a power supply exactly like the one originally

packed with your unit. See the full explanation of the power supply requirements elsewhere in this manual.

WEAR PARTS: This product contains no wear parts.

Manual-1

STEREO/MONO switch

OVERLOAD indicators

Remote POWER supply input

The unit is supplied from the factory with a
Model RS 1 remote power supply suitable for
connection to this input jack. The power
requirements of the unit call for an 18 volt
AC center-tapped transformer only. This is

Converts the INPUTS from stereo to mono so
that a single input cable drives both sides of
the headphones. In some instances a
STEREO program may be confusing for live
monitoring purposes, and switching to MONO
improves intelligibility by summing the Left
and Right signals.

Chassis ground point

A screw is supplied for chassis grounding
purposes. This unit comes with an outboard
power supply which does not ground the

The red LEDs light when the input signal
exceeds the MH 4’s output capability (3 dB
below maximum). Occasional flickering is
acceptable.The overload point automatically
varies with the headphones used.

not a telephone jack. Never use a

power supply with your unit other than

the one supplied or a replacement

approved by Rane Corporation. Using any

other type of supply may damage the unit
and void the warranty.

Manual-2

chassis through the line cord. The MH 4 can
be grounded either to another chassis which
is earth grounded, or directly to the
grounding screw on an AC outlet cover by
means of a wire connected to this chassis
grounding screw.

PHONE Output jacks

Individual LEVEL controls

POWER switch and LED

These stereo ¼" TRS jacks accept standard
¼" TRS stereo headphone plugs.

INPUT jacks

These are automatic balanced/unbalanced
Inputs, which accept either a ¼" TRS (Tip­Ring-Sleeve) plug for balanced operation, or
a ¼" TS (Tip-Sleeve) plug for unbalanced
operation. A balanced line is best when
connecting a cable over 10 feet in length.
You do nothing different when hooking up
balanced or unbalanced lines. The MH 4 is
one smart animal.

These control the volume for each set of
headphones as they are driven from the
INPUTS. It’s always a good idea to keep this
control turned down before plugging in a
pair of phones, then turn it up slowly.

MH 4 CONNECTION

With the power switch in the off (out) position, plug the
power cord into the appropriate AC power source indicated
on the rear panel. Locate the power supply case away from
the MH 4 and other hum sensitive equipment.

Begin with all LEVEL controls counterclockwise at “0”.
Plug the outputs from a mono or stereo source into the
INPUTS.

See Sound System Interconnection on page 8 for more
information on proper cable wiring between devices.

Your basic, straightforward power switch.
When the yellow LED is lit, the MH 4 is
ready to go.

Manual-3