Level Setting; Crossover Adjustments - Soundstream Reference Series 604 Installation Manual

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
sources with minimal output.
In the ideal situation, all components in the audio system reach maximum
undistorted output at the same time. The reason for this is because an amplifier
will only make what comes into 1 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
follow
the below procedure for the quickest, easiest means of
setting the levels.
1. Turn the amp's input levels to minimum position (fully counterclockwise).
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 mtimum undistorted level is heard in the system.
best combination of output level and Signa/ to Noise ratio
NOTE: Your
There is an additional level control on the REFERENCE604 for subwoofer level
adjustment. The purpose of this control is to provide additional range for the
controls the level of any channels or outputs in the low pass mode.
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INSTALLATION STEP 8 b

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
information in this region. the final response is very smooth and natural
sounding.
red Asvmmetr~cal Cros
The REFERENCE604 incorporates a continuously variable staggered
asymmetrical electronic crossover. The high and low pass portions of the
crossover can be adjusted independent of one another.
below to adjust the crossover.
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 dial for the high
pass. 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 frequencies.
Follow the procedure
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