Manual-4
햿
PHONES LEVEL
control adjusts the loudness of the Headphone output signal. Always start with the
LEVEL
at minimum
(CCW) and increase to a comfortable level with signal present and your headphones on. This prevents tossing them across
the room after you put them on and plug in with the level set too high. The
TTM 54
Headphone Amplifier delivers very
high sound pressure levels (SPL) into most headphone loads. Because of the high current and low output impedance,
never
short one side to ground
or
short left and right together as is possible with mono cup headphones. Note: Low power head-
phone stages typically use large resistors on their outputs, which allow shorting, but prevent high power. The TTM 54 gives
you high power but does not allow shorting.
헀
MASTER / CUE
switch is used to select the
HEADPHONES
monitor source:
• Use
MASTER
to rehearse your performance. This signal is the same as that at the
MASTER OUT
, but is not
affected by the
MASTER LEVEL
control.
` Use
CUE
to monitor the Program Input signal, so you can “Cue” a signal before fading in. This signal is not
affected by the
Program Faders
or
Crossfader
.
헁
PHONES PAN
control is only active when
CUE
is selected. This control allows you to
PAN
between
Program 1
or
Program 2
.
헂
HEADPHONES
jack provides a high current output, capable of driving headphones between 8 ohms and 600 ohms.
Because the amplifier is capable of high current drive, it is important that the outputs are not shorted together or to ground.
Do NOT use single cup phones that short tip and ring.
헃
MASTER LEVEL
adjusts the
MASTER OUTPUT
level for both the balanced and unbalanced outputs.
Important Note
CHASSIS GROUNDING
If your system exhibits excessive hum or buzzing, there is an incompatibility in the grounding configuration between
units somewhere. Here are some things to try:
1. Check that the turntable grounding wires are connected to the PHONO GND posts (see
).
2. Try combinations of lifting grounds on units that are supplied with ground lift switches or links.
3. If your equipment is in a rack, verify that all chassis are tied to a good earth ground, either through the line cord ground-
ing pin or the rack screws to another grounded chassis, or tied to the ground screw located just above the POWER jack.
4. This unit’s outboard power supply does not ground the chassis through the line cord. Make sure that this unit is
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 a screw on the chassis with a star washer to guarantee proper contact.
Please refer to RaneNote 110 “Sound System Interconnection” (supplied with this manual and available on request or at
our web site) for further information on system grounding.
