Bedienungsanleitung JL Audio RD400 (Seite 8 von 20) (Englisch)

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8 | JL Audio - RD400/4 Owner’s Manual

INPUT SENSITIVITY CONTROLS

The control labeled “Input Sensitivity” and

“Clipping” LED are used to match the source

unit’s output voltage to the input stage of the

RD400/4 for maximum clean output. Rotating the

control clockwise will result in higher sensitivity

(louder for a given input voltage). Rotating the

control counter-clockwise will result in lower

sensitivity (quieter for a given input voltage).

To properly set the amplifier for maximum

clean output, please refer to Appendix A (page

14) in this manual. After using this procedure,

you can then adjust the “Input Sensitivity”

levels downward if this is required to achieve the

desired system balance.

Do not increase any “Input Sensitivity”

setting for any channel(s) of any amplifier in the

system beyond the maximum level established

during the procedure outlined in Appendix

A (page 14). Doing so will result in audible

distortion and possible speaker damage.

Left

Mono

Right

Only

+12 VDC Ground Remote

Input Mode

2 Ch.

4 Ch.

Input Voltage

Low

High

Rem.

Oset

Signal

CH. 1

CH. 2

CH. 3

CH. 4

(

)

(

)

INPUT SECTION

Turn On Mode

PRE-OUTS

CH. 3

(

)

CH. 4

(

)

CH. 1

(

)

CHANNELS 1 & 2

CH. 2

(

)

Filter Mode

Filter Freq. (Hz)

O

Filter Mode

O

Input Type Input Sensitivity Input Sensitivity

Stereo

Mono

Input Type

Stereo

Mono

4 Channel Amplifier

CHANNELS 3 & 4

Clipping

FILTER CONTROLS

Most speakers are not designed to reproduce

the full range of frequencies audible by the human

ear. For this reason, most speaker systems are

comprised of multiple speakers, each dedicated

to reproducing a specific frequency range. Filters

are used to select which frequency range is sent

to each section of a speaker system. The division

of frequency ranges to different speakers can be

done with passive filters (coils and/or capacitors

between the amplifier outputs and the speakers),

which are acceptable and commonly used

for filtering between mid-range speakers and

tweeters. Filtering between subwoofer systems

and satellite speaker systems is best done with

active filters, which cut off frequency content at

the input to the amplifier. Active filters are more

stable than passive filters and do not introduce

extraneous resistance, which can degrade

subwoofer performance.

The active filter built into each channel

section of the RD400/4 can be used to eliminate

potentially harmful and/or undesired frequencies

from making their way through the amplifier

sections to the speaker(s). This serves to improve

tonal balance and to avoid distortion and possible

speaker failure. Correct use of these filters can

substantially increase the longevity and fidelity of

your audio system.

1) “Filter Mode” Controls: The RD400/4

employs 12 dB per octave filters for each

pair of channels. Each of these filters can be

controlled or defeated completely by way of the

three-position “Filter Mode” switches in each

Channel Section:

“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 from this

channel pair.

“LP” (Low-Pass): Configures the filter to

attenuate frequencies above the indicated filter

frequency, at a rate of 12 dB per octave. This

is useful for connection of subwoofers to one

or more of the RD400/4’s channel pairs in a

bi-amplified system.

“HP” (High-Pass): Configures the filter to

attenuate frequencies below the indicated filter

frequency at a rate of 12 dB per octave. This is

useful for connection of component speakers

or coaxials to one or more of the RD400/4’s

channel pairs in a bi-amplified system.

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.

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