STEP 3. (3) SUBSONIC (Subsonic Filter)
Subsonic filters are commonly used to minimize over excursion at very low frequencies, or to optimize output power by only amplifying frequencies that can be effectively reproduced. This feature is essentially a high pass filter with a very low frequency range, and is selectable from 15Hz to 50Hz in 5Hz increments. Please make sure that the frequency selected is significantly lower than that of the low pass filter, unless you have a very specific performance goal in mind. To the right is example [2], which illustrates the effect of a subsonic
2 Lower Frequency | (LPF) | Higher Frequency | |||
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30Hz Sample Adjustment
0dB
10Hz | 20 | 30 | 40 | 60 | 100K | 1000K |
ADJUSTING THE SUBSONIC FILTER
•You should be in mode "3" (SUBSONIC) now from the previous step.
•Push "ENT" to enter "3". Push "ENT" to enter
•Toggle to "ON" setting and push "ENT".
•Push "ENT" to enter
•Toggle to desired frequency.
•Typical settings include 25Hz for sealed box, and 30Hz
or higher for ported box. (depending on tuning freq.)
• Press "MODE" to advance to step 4 below.
START HERE
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STEP 4. (4) PARAMETRIC EQ (Frequency, Width (Q), and Level) | 3 Lower Frequency | (LP) |
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Using the Parametric EQ is a good way to fine tune your |
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subwoofer or adjust for personal taste. Unlike traditional bass |
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boost or graphic EQ's, both the center frequency and width of |
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| 50Hz | Sample Adjustment |
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the EQ band is user selectable, allowing it to be custom tailored | 0dB |
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for the desired effect. As you can see in example [3], with the |
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subsonic and low pass filters engaged, you can enhance your |
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sound by focusing on a high energy bass response in the | 10Hz 20 30 | 40 60 | 100K | 1000K |
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vehicle. When set to its widest setting, this can also function as |
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an overall gain adjustment. |
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| Level |
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| Adjustment |
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| width setting, "0.5 or 1" will represent a "WIDE" |
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SETTING THE PARAMETRIC EQ | band width and "5" will represent a "NARROW" |
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• You should be in mode "4" (PARAMETRIC EQ) now | bandwidth. |
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from the previous step. | START HERE |
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• Push "ENT" to enter the adjustment menu. |
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• Push "ENT" to enter |
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• Toggle | to "ON" and push "ENT" |
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• Push "ENT" to enter |
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• Toggle | to desired freq. and push "ENT". |
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• Push "ENT" to enter |
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| MODE | T |
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(note: a lower | Q Value= Wider, |
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a higher Q value = more narrow) |
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• Push "ENT" to enter |
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• Toggle | to desired level (boost or cut) |
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• Press "MODE" to advance to step 5 or "DISP" to exit.
STEP 5. (5) BASS COMP. (Bass Compensation)
Digital Bass Compensation utilizes Alpine's exclusive MediaXpanderTM processing technology to enhance bass definition and output. This is an especially useful feature in restoring bass quality lost with compressed media such as MP3's.
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| START HERE | |||||
SETTING BASS COMPENSATION |
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• You should be in mode "5" (BASS COMP.) now |
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from the previous step. |
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• Push "ENT" and push "ENT" again to select |
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• Toggle |
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• Press |
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ENT
Toggle
Mode
T |
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6 |
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T
O
E X I T
To find out more, visit www.alpinetechcenter.com