7
GAIN MATCHING
In any audio system, the goal is to reach maximum input and output levels without distortion or clipping.
The engineers at KICKER have taken the guesswork, and hassle, out of matching the output voltage of
your source unit to the amplifi er with the Gain Matching feature. To begin, you’ll need to download the
KICKER test tones from www.kicker.com/test-tones. The following fi les are available in MP3 and WAV
formats:
1kHz @ 0dBFS, 50Hz @ 0dBFS, 1kHz @ -10dBFS, 50Hz @ -10dBFS, 1kHz @ -5dBFS, 50Hz @ -5dBFS
These test tones are sine waves meant to provide a consistent signal for the KXMA amplifi er to reference.
The different recording levels are designed to give you the perfect gain match for your application.
0dBFS:
Designed for audiophile applications to give you distortion free audio output with the most
dynamic range.
-5dBFS:
Designed for normal/daily applications, there will be less dynamic range but higher potential
audio output levels. With this set up you can get some occasional clipping from the amplifi er.
-10dBFS:
Designed only for Subwoofer applications, there will be less dynamic range but higher potential
audio output levels. With this set up you can get some clipping from the amplifi er.
Afterwards, use the following procedure to accurately Gain Match your amplifi er(s):
1. Disconnect the speakers from the KXMA amplifi er.
2. Set all EQ and crossover settings to fl at on your source unit.
3. Play the downloadable fi le from KICKER.com
4. Turn the source unit up to 3/4 volume.
5. Increase the gain of the amplifi er until the Gain LED turns on.
6. Decrease the gain of the amplifi er until the Gain LED turns off.
All level matching circuitry in the KXMA amplifi ers is at the beginning of the signal chain. If you are going to
use features like bass boost, it may be necessary to readjust the gain to a lower setting to compensate
for increased output at those frequencies.
Once the amp and source unit are gain matched, you will want to make certain you are not overdriving
your speakers. Use the following procedure:
1. Set the source until volume to 0.
2. Reconnect the speakers to the KXMA amplifi er.
3. Slowly increase the volume level of the source unit as you listen for audible distortion.
4. If you can hear clipping, decrease the gain of the amplifi er until it is gone.
GAIN
MATCH
Set the
1X/10X
frequency multiplier switch to the setting that is appropriate for your application. A setting
of
10X
will set the range of the
AMP 1
crossover to 100–5,000Hz, and the low pass crossover of
AMP 2
to 100–5,000Hz. For KXMA stereo amplifi ers, the frequency multiplier switch will only affect the low pass
crossover.
KICK EQ Bass Boost Control:
The variable bass boost control on the side of the amplifi er is designed
to give you increased output, 0–6dB, at 40Hz. The setting for this control is subjective. If you turn it up,
you must readjust the input gain control to avoid clipping the amplifi er.
2021 KXM Stereo Amps Rev D.indd 7
6/28/2021 8:33:49 AM
Содержание KXMA Series
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