Bedienungsanleitung JL Audio 250 (Seite 8 von 11) (Englisch)

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out of the preamp outputs of the amplifier are

compatible with the “Low” setting on the

“Input Range” control.

The “Signal Sensing” turn-on feature will not

work on “slave” amplifiers, but “slave” amplifiers

can be turned on and off by a “master” amplifier

operating in signal sensing turn-on mode.

Simply connect the “master” amplifier’s

“Remote” connection, to the “slave” amplifier(s)

“Remote” connection(s).

Do not increase the “Input Sens.” setting for any

amplifier in the system beyond the maximum level

established during the procedure outlined in

Appendix B (page 13). Doing so will result in

audible distortion and possible speaker damage.

4) If you would like to run a third amplifier in

“Slave” configuration, select the “Full-Range”

position on the “Output Mode” switch of the first

“Slave” amplifier.Then, connect an RCA cable

from the first “Slave” amplifier’s preamp outputs to

the second “Slave” amplifier. As you did with the

first “Slave” amplifier, set the second “Slave”

amplifier’s “Amp LP Filter” to the “Off” position.

Then, calibrate the third amplifier’s “Input Range”

and “Input Sens.” controls in the same manner as

you did for the second amplifier.

Additional amplifiers may be added to this

“Master/Slave” configuration following the same

procedure as in step 4.

Once you match the input sensitivities of all the

amplifiers, you can use the “Master” amplifier’s

“Amp LP Filter”,“Infrasonic Filter” and “Bass

Boost” features to control the “Slave” amplifier(s).

Below is a diagram showing a Master/Slave

configuration with one “Master” (top amplifier)

and two “Slave” amplifiers. Switches and controls

that are defeated in the “Slave” amplifiers are

printed in gray.

JL AUDIO 250/1 15

Connect Master 250/1 Preamp Output

to Slave A 250/1 Input

Connect Slave A 250/1 Preamp Output to Slave B 250/1 Input

Connect Master 250/1 Input to Signal Source

APPENDIX C:

Master/Slave Configurations

With the flexible on-board crossovers and

processing incorporated into the 250/1, it is

possible to connect multiple 250/1’s in a

“Master/Slave” configuration, with each amplifier

driving its own speaker system but controlled by

the processing and filtering of only one amplifier.

This is very useful when driving multiple

subwoofers with multiple amplifiers.

To create a Master/Slave configuration, first

determine which amplifier will be the “Master”

amplifier and connect the main input signal to that

amplifier (from the source unit or from an

outboard processor).This amplifier’s “Amp LP

Filter” section “Infrasonic Filter” and “Bass

Boost” features will process the signal for the

“Slave” amplifier or amplifiers.

Here is the procedure for implementing a

“Master/Slave” configuration:

1) Set the “Master” amplifier’s “Output Mode”

switch to the center “Low-Pass” position.This will

send a parallel, mono-summed signal from the

“Master” amplifier’s “Amp LP Filter” section to its

preamp outputs.

2) Connect an RCA cable from the “Master”

amplifier’s preamp outputs to the main input of the

first “Slave” amplifier. Set the “Slave” amplifier’s

“Amp LP Filter” to the “Off” position.This will

defeat the LP filter and the bass processing of this

“Slave Amplifier”.

3) The input sensitivity of the two amplifiers

needs to be adjusted independently.To properly

calibrate the amplifiers for maximum, identical, clean

output, please refer to Appendix B (page 13).

After using this procedure, you can then adjust the

level of the amplifiers by adjusting the input

sensitivities downward, if the amplifiers require

attenuation to achieve the desired system balance.

If the input sensitivities are adjusted, the amplifiers

must be recalibrated to ensure identical power

output levels.

Please note that the “Input Range” switch on

all “slave” amplifiers needs to be set to “Low”,

even if the “master” amplifier is high voltage and

its switch is set to “High”. All signals passed

14 JL AUDIO 250/1

MASTER:

The Master amplifier’s

“Bass Control” section is

active and affects

all three amplifiers equally.

The last Slave amplifier’s

“Bass Control” section,

AMP LP Filter and “Preamp

Output” are inactive.

This Slave amplifier’s

“Bass Control”section and

AMP LP Filter are inactive,

but the Full-Range (pass-through)

feature of its “Preamp Output”

feeds the input of the

next Slave amplifier.

SLAVE (A):

SLAVE (B):

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