Bedienungsanleitung JL Audio RD400 (Seite 9 von 20) (Englisch)

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Tuning Hint: If you are using the RD400/4

to drive a subwoofer system (“LP” mode), a

component satellite speaker system (“HP” mode)

or both, 80 Hz is a good baseline “Filter Freq.

(Hz)” setting. After properly adjusting the “Input

Sensitivity”, as outlined in Appendix A (page 14),

you can fine tune the “Filter Freq. (Hz)” control

to achieve the desired system frequency response.

PREOUTS

The RD400/4 incorporates a buffered, pass-

through preamp output section, so that additional

amplifiers can be easily added to the system. This

pass-through preamp output delivers a summed

stereo signal (CH. 1&3 / CH. 2&4) to a subwoofer

amplifier, while permitting fading of the front and

rear speaker systems from the source unit. This

method prevents a loss of signal to the subwoofer

amplifier when the system is faded to the front or

the rear by the head unit. Note: The level of the

preamp output is an average, taken from both left

and both right inputs. If only two inputs channels

are used, the preamp output level will be reduced

by –6 dB (or half).

Note: Any signal delay between the front and rear

channels can result in a cancellation of signals

within certain frequency ranges. If you experience

a loss of bass output, you are likely dealing with a

delayed signal in either the front or rear outputs

of the source unit. If the front to rear delay cannot

be defeated at the source unit, we recommend that

you use the FiX™ 82 or FiX™ 86 OEM Integration

DSP to correct any delayed signals. If the delay is

desirable for other reasons, we recommend using

Y-adaptors to split the input signal to feed other

amplifiers, rather than using the preouts.

Note: The preamp output delivers the same

signal that is connected to the RD400/4’s inputs.

The preamp output signal is not affected by the

amplifier’s filter controls. If the input signal is

full-range, the preamp output will be full-range.

Note: When the “Input Voltage” switch is in its

“Low” position, the level of the “Preouts” signals

matches the input signal levels (unity gain). When

the “Input Level” switch is in the “High”

position, the level of the input signal is attenuated

–12 dB to produce a line level signal at the

“Preouts”. This ensures a proper line level signal

output under both conditions.

If you plan to use the “Preouts” to feed a stereo

amplifier, you must connect a stereo signal to

the input of the amplifier. A mono signal into

the amplifier will result in a mono signal out of

the preamp output.

SPEAKER OUTPUTS

The RD400/4’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 RD400/4’s channels is

designed to deliver power into speaker loads

equal to or greater than 2 ohms per channel

when using a “stereo” configuration and speaker

loads equal to or greater than 4 ohms per bridged

pair when using a “bridged” configuration.

INPUT SECTION

(

)

(

)

Left

Mono

Right

Only

CH. 1&2 CH. 3&4

CH. 3

(

)

CH. 4

(

)

CH. 1

(

)

CH. 2

(

)

BridgedBridged

Speaker OutputsSpeaker Outputs

PREOUTS

+12 VDC Ground Remote

Speaker loads below 2 ohms nominal per

channel (or 4 ohms bridged) are not

recommended and may cause the amplifier

to enter a protection mode.

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