12
CROSSOVER ADJUSTMENTS
In most car audio installations, there is a tendency for a “midbass boom.” Because of their interior dimensions,
most cars will resonate or ring at these midbass frequencies. If we design the system so there is less musical
information in this region, the final response is very smooth and natural sounding. The Reference705
incorporates a continuously variable staggered asymmetrical electronic crossover. The high and low pass
portions of the crossover can be adjusted independent of one another. Follow the procedure below to adjust the
crossover.
Staggered Asymmetrical
Crossover
24 dB/octave low pass,
12 dB/octave high pass
Low Pass
High Pass
NOTE: You may find it necessary to readjust the
crossover after listening to the system. The correct
settings are a combination of the capabilities of the
equipment and your listening preferences.
INSTALLATION STEP 7
LEVEL SETTING
The input levels are adjusted by means of the input level controls located on the front of the amplifier. This is a
unique dual-stage circuit that adjusts both level and gain. This topology maintains better Signal to Noise ratios
even with low output sources.
In the ideal situation, all components in the audio system reach maximum undistorted output at the same time.
The reason is because an amplifier will only make what comes into it bigger. So, if you send it a distorted
signal from the head unit, it is going to amplify distorted information. The same thing holds true if an outboard
processor or crossover begins to distort before you have maximum output from the amplifier. By setting all
components to reach clipping at the same time, you can maximize the output of your system. For the
Reference705, follow the below procedure for the quickest, easiest means of setting the levels.
1. Turn the amplifier's input levels to minimum position (fully counter-clockwise).
2. Set source unit volume to approximately 3/4 of full volume.
3. While playing dynamic source material, slowly increase the amplifier’s input level until a near maximum
undistorted level is heard in the system.
INSTALLATION STEP 8
NOTE: Your best combination of output and Signal to Noise ratio will
be achieved when the input levels are set between 500 mV and 2.5
1. With the crossover activated, set the frequency adjustments to the 12
o’clock position.
2. While listening to music, adjust the high pass frequency control.
Select a frequency high enough to prevent damage to the speakers,
yet low enough that you are able to retain midbass in the front
speakers.
3. Adjust the low pass frequency control in the same way as the high
pass. This time, listen to the bass. You should find a setting that will
give you a solid sound with minimum “boom” from resonating
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