Speaker Outputs; Bridging Considerations - JL Audio iM700/5 Owner's Manual

Channel 1 & 2 Filter: 12dB/octave High-Pass
only, with x10 multiplier switch
"Off": Defeats the filter completely, allowing
the full range of frequencies present at the inputs
to feed these channels. This is useful for systems
utilizing outboard active crossovers or requiring
full-range reproduction this channel pair.
"x1" (High-Pass): Configures the filter
to attenuate frequencies below the indicated
filter frequency at a rate of 12dB per octave.
This is useful for connection of component
speakers or coaxials to this channel pair in a
bi-amplified system.
"x10" (High-Pass): Configures the filter to
attenuate frequencies below a frequency TEN
TIMES HIGHER than the indicated filter
frequency at a rate of 12dB per octave. This is
useful for connection of tweeters to this channel
pair in a tri-amplified system.
Channel 3 & 4 Filter: 12dB/octave High-Pass
or Bandpass Filter
"Off": Defeats the filter completely, allowing
the full range of frequencies present at the inputs
to feed these channels. This is useful for systems
utilizing outboard active crossovers or requiring
full-range reproduction this channel pair.
"BP" (High-Pass): Configures the filter to
attenuate frequencies below the indicated filter
frequency AND above the Channel 1 & 2 Filter
Frequency, at a rate of 12dB per octave. This is
useful for connection of mid-bass or mid-range
speakers in a tri-amplified system.
"HP" (High-Pass): Configures the filter
to attenuate frequencies below the indicated
filter frequency at a rate of 12dB per octave.
This is useful for connection of component
speakers or coaxials to this channel pair in a
bi-amplified system.
Subwoofer Channel Filter: 12dB/octave
or 24dB / octave, Low-Pass only
"Off": Defeats the filter completely, allowing
the full range of frequencies present at the inputs
to feed this channel. This is useful for systems
utilizing outboard active crossovers.
8 | JL Audio - M700/5 Owner's Manual
"12dB" (Low-Pass): Configures the filter
to attenuate frequencies above the indicated
filter frequency at a rate of 12dB per octave.
This is useful for connection of subwoofers
in a bi-amplified system. This shallower slope
gently attenuates high-frequencies from your
subwoofer signal and is often well-suited for
systems with smaller main speakers.
"24dB" (Low-Pass): Configures the filter
to attenuate frequencies above the indicated
filter frequency at a rate of 24dB per octave.
This is useful for connection of subwoofers in
a bi-amplified system. This sharper slope more
aggressively removes high-frequencies from
your subwoofer signal and is often well-suited
for systems with larger main speakers, like our
7.7-inch component and coaxial systems.
2) "Filter Freq. (Hz)" The filter frequency
markings surrounding these rotary controls
(one in each Channel Section) are for
reference purposes and are generally accurate
to within 1/3 octave or better. If you would
like to select the filter cutoff frequency with a
higher level of precision, consult the chart in
Appendix B (page 15).
Tuning Hint: If you are using the M700/5
to drive a subwoofer system ("LP" mode),
and component satellite speaker systems
("HP" mode), 80 Hz is a good baseline
"Filter Freq. (Hz)" setting. After properly
adjusting the "Input Sens.", as outlined in
Appendix A (page 14), you can fine tune
the "Filter Freq. (Hz)" control to achieve
the desired system frequency response.
remote leVel Control (oPtional)
With the addition of the optional Remote
Level Control (HD-RLC), you can control the
volume of the subwoofer channel (Subwoofer
Level) or of the entire M700/5 from the front of
the vessel (Master Volume).
The HD-RLC connects to the jack labeled
"Remote Level Control" on the Connection Panel
of the amplifier using a standard telephone cable
(supplied with the HD-RLC). If desired, multiple
M (and HD) amplifiers can be controlled from a
single HD-RLC controller using a simple phone
line "splitter" and multiple phone cables.
When connected to the amplifier, the
HD-RLC operates as follows. At full counter-
clockwise rotation, the audio of the selected
channels 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.
"Remote Level Mode" Switch: This switch
allows you to assign the operation of the
HD-RLC to the entire amplifier or only the
subwoofer channel. In the "All" position, the
HD-RLC knob will affect all channels equally.
In the "Sub Ch." position, only the level of
the subwoofer channel will be affected by the
HD-RLC knob.

sPeaker outPuts

The M700/5's speaker outputs are designed
to accept 16 AWG - 8 AWG wire. To connect the
speaker wires to the amplifier, first back out the
set screws on the top of the terminal block, using
the supplied 2.5 mm hex wrench. Strip 1/2 inch
(12 mm) of insulation from the end of each wire
and insert the bare wire into the terminal block,
seating it firmly so that no bare wire is exposed.
While holding the wire in place, tighten the set
screw firmly, taking care not to strip the head of
the screw.
Each pair of the M700/5's main channels are
designed to deliver power into speaker loads equal
to or greater than 2 ohms when using a "stereo"
configuration and speaker loads equal to or greater
than 4 ohms when using a "bridged" configuration.
The subwoofer channel is designed to deliver power
into subwoofer loads equal to or greater than 2 ohms.
Speaker loads below 2 ohms nominal per
channel (or 4 ohms bridged) are not
recommended and may cause the amplifier
to initiate a protection mode which reduces
power output.

bridging Considerations

Bridging is the practice of combining the
output of two amplifier channels to drive a single
load. When bridged, each channel produces
signals of equal magnitude, but opposite polarity.
The combined output of the two channels
provides twice the output voltage available from
a single channel. The M700/5 has been designed
for bridging of its main channel pairs without the
need for input inversion adaptors.
To bridge a pair of main channels, use the
"Left +" and "Right –" speaker connectors only
(the "Left –" and "Right +" remain unused). Each
bridged channel pair will deliver optimum power
into a 4 ohm load.
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