Bedienungsanleitung JL Audio M700 (Seite 13 von 20) (Englisch)

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“Filter Freq.” setting. The “24dB” setting engages

a sharper filter slope that more aggressively

attenuates frequencies above the selected “Filter

Freq.” setting. Neither setting is inherently

“better”, but in general, the shallower “12dB”

setting is more desirable for a subwoofer having to

interface with smaller main speakers (6.5-inch or

smaller). The sharper “24dB” setting is typically

better when interfacing with larger main speakers,

like our 7.7-inch components and coaxials.

Experiment to find the slope setting that results in

the smoothest subwoofer to midbass transition.

Next, turn your attention to the “CH 3 &

4” Controls and select “BP” (bandpass) on

the “Filter Mode” switch. A bandpass filter is

actually composed of two filters (one high-pass

and one low-pass), which in combination allow a

defined “band” of frequencies to pass through the

amplifier channels and onto the speakers. These

are ideal for actively filtered mid-bass or mid-

range speakers in automotive sound systems.

Now that you have engaged Bandpass Mode

for Channels 3 & 4, select an appropriate “Filter

Freq.” (again, 80 Hz is a good starting point).

The Filter Frequency you are adjusting with this

control is the high-pass portion of the bandpass

filter. The low-pass portion is automatically set by

the tweeter channel’s “Filter Freq.” adjustment

(CH 1 & 2). The low-pass portion of the bandpass

filter will always track with the CH 1 & 2 “Filter

Freq.” setting.

Finally, turn your attention to the “CH 1

& 2” Controls and select “x10” (high-pass)

on the “HP Filter Mode” switch. This switch

position multiplies the indicated “Filter

Freq.” value by a factor of 10, so that an

indicated frequency of 500 Hz is actually a

filter frequency of 5000 Hz (5 kHz). The filter

slope for this section is fixed at 12dB/octave.

Now, select an appropriate “Filter Freq.” for

your tweeters (5000 Hz is a good starting point).

Before attempting any lower frequency settings,

consult the documentation for the tweeters you

are using and make sure you will not be driving

the tweeters with frequencies lower than they are

designed to handle. JL Audio mobile component

tweeters should not be operated with Filter

Frequencies lower than 3 kHz.

After proper adjustment of the “Input

Sens.” controls for both main channel

pairs and the subwoofer channel using the

method shown in Appendix A (page 14),

you can fine tune filter frequencies and

attenuate either pair of channels to achieve

proper balance. For precise filter frequency

information refer to Appendix B (page 15)

To operate two M700/5’s in Tri-Amplified

mode (one for left channel and the other for right

channel), set the “Input Mode” switches of both

amplifiers in “2 Ch.” mode, and apply the left

channel signal to both the left and right inputs of

the first amplifier’s Channel 1 & 2 Inputs, using

an RCA y-adaptor with one female and two male

ends. Then apply the right channel signal to both

the left and right inputs of the second amplifier’s

Channel 1 & 2 inputs, using a second RCA

y-adaptor with one female and two male ends.

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