Speaker Outputs - JL Audio MHD600/4-24V Owner's Manual

When connected to the amplifier, the HD-RLC
operates as follows. At full counter-clockwise
rotation, the audio will mute completely. At full
clockwise rotation the level will be the same as if
the HD-RLC was not connected at all. In other
words, it operates strictly as a level attenuator.
Depending on the application, you may want
the HD-RLC to only affect one channel pair or
both channel pairs. A switch labeled "Remote
Level Control" in the "General Setup" Section
of the Control Panel allows you to determine
whether the HD-RLC affects the level of all
channels "All Ch." or only the rear channels
"Rear Ch."
For example, if you are using the MHD600/4-
24V in a stand-alone bi-amplified mode, you
may want the HD-RLC to only affect the level
of the subwoofer channels. Setting the "Remote
Level Control" switch to the "Rear Ch." position
accomplishes this (provided the subwoofer system
is connected to the rear channels).
In other cases, you may want control of all
four channels at the same time, so you would
set the "Remote Level Control" switch to the
"All Ch." position.
The RBC-1 Remote Bass Control used with
JL Audio Slash, Slash v2, e-Series, A-Series and
G-Series amplifiers is NOT compatible with the
MHD Series amplifiers. If you attempt to
connect an RBC-1 to an MHD amplifer, the
control will not work. You must use the
HD-RLC controller.
14 | JL Audio - MHD600/4-24V Owner's Manual

sPeaker outPuts

The MHD600/4-24V employs JL Audio's
exclusive Regulated, Intelligent Power Supply
(R.I.P.S.) design. The operation of the R.I.P.S.
system is independent for each pair of channels.
This sophisticated power supply allows the
amplifier to produce its optimum power (150
watts x 4) over a wide range of speaker
impedances.
Unlike conventional amplifiers that require
a specific impedance to produce optimum
power, the R.I.P.S.-equipped MHD600/4-24V
gives you the freedom to use a variety of speaker
configurations that achieve final nominal
impedances between 1.5 – 4Ω per channel in
stereo (without sacrificing power output or sound
quality). When bridged, each channel pair will
optimize output at 300 watts between 3 – 8Ω.
The operation of the R.I.P.S. circuitry is
entirely automatic and adjusts itself every time the
amplifier is turned on. There are no user controls
to configure. The system operates through
multiple stages of impedance optimization,
choosing the stage most appropriate to the actual
impedance of the speakers you connect to it.
If you connect a load higher than 4Ω nominal
per channel in stereo mode (or 8Ω in bridged
mode), power will drop by half with every
doubling of impedance above 4Ω stereo / 8Ω
mono. If you connect a load lower than 1.5Ω
nominal per channel in stereo mode (or 3Ω in
bridged mode, the amplifier protection
circuitry activates a "safe" mode which reduces
amplifier power to protect the circuitry from
failure (the LED status indicator on the control
panel will light up amber to indicate that this
has happened). See page 16 for details.