Bedienungsanleitung JL Audio MHD900 (Seite 10 von 24) (Englisch)

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10 | JL Audio - MHD900/5-24V Owner’s Manual

The output of the amplifier decreases for a

given input voltage when the “Input Range”

switch is placed in the “High” position. The

output increases with the switch in the “Low”

position. While this may sound counter-

intuitive, it is correct as described.

CHANNEL CONTROL SECTIONS

To the left of the “General Setup” section on

the Control Panel of the amplifer are three sets of

controls: one for the “Rear Channel Controls”

one for the “Front Channel Controls” and

one for the “Subwoofer Channel Controls”.

In each of these sections you will find a

rotary control labeled “Input Sens.” (Input

Sensitivity). These controls are designed to match

the input sensitivity of each channel section of

the MDH900/5-24V to the specific signal source

that is feeding the amplifier. These controls must

be adjusted, with care, following the procedures

outlined in this manual. Failure to make correct

adjustments can result in weak output, excessive

distortion and/or undesirable noise in the audio

output of the amplifier!

Note: The Channel Control sections also house

“High-Filter” or “Low-Pass Filter” and “Filter

Freq.” controls. These are crossover filter controls

and will be discussed in the next section of this

manual. This section will explain the Input

Controls only.

“Input Sens.” Controls

Once the appropriate “Input Voltage” range

has been selected in the “General Setup” section

of the amplifier, the “Input Sens.” controls are

used to match the source unit’s output voltage to

the input stage of each pair of amplifier channels

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 each pair of amplifier channels for maximum

clean output, please refer to Appendix C (pages

18, 19) in this manual.

After using this procedure, you can then adjust

the relative level of each channel pair by adjusting

the input sensitivity downward on any of the

channel sections, if they require attenuation to

achieve the desired system balance.

Do not increase the “Input Sens.” setting for

any amplifier or channel section in the system

beyond the maximum level established during

the procedure outlined in Appendix C (pages 18,

19). Doing so will result in audible distortion and

possible speaker damage.

Be aware that all three “Input Sens.”

adjustments will need to be made, regardless

of how many input cables are feeding the

amplifier. These controls will allow you to set

the appropriate relative levels for the “Front”

channels relative to the “Rear” channels and the

“Sub” channel (and any other amplifier channels

in the system).

CROSSOVER CONTROLS

Crossovers are groups of electronic filters

designed to control the frequency ranges

that each speaker in a system will be tasked

with reproducing. Proper crossover setup is

critical to sound quality and reliability.

The MDH900/5-24V has three individually

adjustable filter controls, one for the “Front”

channels, one for the “Rear” channels and

another for the “Sub” channel. The “Front”

and “Rear” filters are high-pass filters (they

attenuate low frequencies), while the “Sub”

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