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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
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 "3-1" (ON/OFF).
• Toggle to
"ON" setting and push "ENT".
• Push "ENT" to enter "3-2" (FREQUENCY).
• 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.
STEP 4. (4) PARAMETRIC EQ (Frequency, Width (Q), and Level)
Using the Parametric EQ is a good way to fine tune your
subwoofer or adjust for personal taste. Unlike traditional bass
boost or graphic EQ's, both the center frequency and width of
the EQ band is user selectable, allowing it to be custom tailored
for the desired effect. As you can see in example [3], with the
subsonic and low pass filters engaged, you can enhance your
sound by focusing on a high energy bass response in the
vehicle. When set to its widest setting, this can also function as
an overall gain adjustment.
SETTING THE PARAMETRIC EQ
• You should be in mode "4" (PARAMETRIC EQ) now
from the previous step.
• Push "ENT" to enter the adjustment menu.
• Push "ENT" to enter "4-1" (ON/OFF).
• Toggle
to "ON" and push "ENT"
• Push "ENT" to enter "4-2". (FREQUENCY)
• Toggle
to desired freq. and push "ENT".
• Push "ENT" to enter "4-3". (WIDTH)
• Toggle
to attain the desired width
(note: a lower Q Value= Wider,
a higher Q value = more narrow)
• Push "ENT" to enter "4-4". (LEVEL
• Toggle
to desired level (boost or cut)
• 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
TM
MediaXpander
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.
SETTING BASS COMPENSATION
• You should be in mode "5" (BASS COMP.) now
from the previous step.
• Push "ENT" and push "ENT" again to select "5-1" (ON/OFF).
• Toggle
to "ON".
• Press "MODE" to advance to step 6 or "DISP" to exit.
2
Lower Frequency (LPF)
0dB
10Hz
START HERE
ENT
3
Lower Frequency (LP)
2
Lower Frequency (LP)
0dB
10Hz
NOTE: When adjusting the selected frequency's
0dB
width setting, "0.5 or 1" will represent a "WIDE"
band width and "5" will represent a "NARROW"
bandwidth.
START HERE
ENT
ENT
ENT
20Hz
Toggle
ENT
ENT
START HERE
ENT
To find out more, visit www.alpinetechcenter.com
Higher Frequency
30Hz Sample Adjustment
20
30
40
60
100K
Toggle
Toggle
ENT
ENT
Hz
MODE
For Sealed
OR
ENT
For Ported
Hz
Higher Frequency
50Hz Sample Adjustment
20
30
40
60
100K
Level
Toggle
ENT
ENT
For MRD-M300
OR
5
10
50
For MRD-M500
Hz
MODE
ENT
Toggle
ENT
Mode
1000K
T
O
S
T
E
P
4
1000K
50Hz Sampl
Variable Width
Adjustment
Toggle
dB
T
T
O
O
100
500 1K
E
S
DISP
T
X
I
E
P
OR
T
5
T
T
O
O
E
S
DISP
X
T
I
E
OR
T
P
6
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