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Tables related to MODE and FUNCTION
MODE
FUNCTION
Contents
No.
Contents
No.
INPUT MODE
1-1
SELECT
1
1-2
LEVEL
1-3
GAIN FACTOR
2
LPF
2-1
ON/OFF
2-2
FREQUENCY
3
SUBSONIC
3-1
ON/OFF
3-2
FREQUENCY
4
PARAMETRIC EQ
4-1
ON/OFF
4-2
FREQUENCY
4-3
WIDTH
4-4
LEVEL
5
BASS COMP.
5-1
ON/OFF
5-2
MODE *Only MRD-M1000.
6
TIME CORR.
6-1
ON/OFF
6-2
DELAY TIME
PHASE
7-1
0/180
7
AMP SET
8-1
ID No.
8
8-2
TURN ON DELAY
9
OUTPUT DISABLE
9-1
ON/OFF
MEMORY
0-1
WRITE
0
0-2
READ
STEP 1. (1) INPUT
Proper configuration of the input setup menu is critical for source signal matching with minimal distortion, while also
optimizing the output level relative to other amplifiers in the system. INPUT SELECT (mode 1-1) should be set
according to the physical input signal connection being made, either "2ch" for stereo or "1ch" for single/mono
channel. INPUT LEVEL (mode 1-2) allows the A/D converter's input to be optimized for the best possible signal
clarity and volume range. Setting this overly sensitive or severely clipping the input can result in very high distortion,
so it is best to use the clipping indicator as general guide. GAIN FACTOR (mode 1-3) is provided for special cases
where additional gain is still required after all other adjustments have been made. While this signal shaping
algorithm allows a higher average output level to be reached at lower source volumes, signal alteration may not be
desirable in some applications. Therefore, it is recommended to return to this adjustment again later after continuing
through the remaining setup steps.
SETTING THE INPUT
• Push "MODE" to access "1" (INPUT).
• Push "ENT" enter "1". Push "ENT" to enter "1-1" (SELECT).
• Toggle
to select "1ch" or "2ch". Push "ENT".
• Push "ENT" to enter "1-2" (INPUT LEVEL).
• Toggle
to the input level that will properly match the
source unit output to the amplifier input. Severely clipping the
input will result in high distortion, so use the clipping indicator
as a guide to set this level.
• Push "ENT" to enter "1-3" (GAIN FACTOR). Push "ENT".
• Toggle
to select "0", "6" or "9".
• Press "MODE" to advance to step 2 below.
STEP 2. (2) LPF (Low Pass filter)
Eliminating unwanted higher frequencies is essential for optimizing
subwoofer performance and integration with the rest of the system.
Selecting the appropriate cut off frequency of the low pass filter will
depend upon the application, so a wide frequency range (30Hz-
200Hz) is provided to choose from. Please note however, that if the
selected frequency is very close to or overlaps with the subsonic filter,
it will result in little or no output. Also, if an external crossover is
used, the internal filter can be turned off.
ADJUSTING THE CROSSOVER
• You should be in mode "2" (LPF) now from the
previous step.
• Push "ENT" to enter "2".
• Push "ENT" to enter "2-1" (ON/OFF).
• Toggle
to "ON". Push "ENT".
• Push "ENT" to enter "2-2" (FREQUENCY).
• Toggle
to desired frequency.
• Push "MODE" to advance to step 3 below.
Copyright 2002 © Alpine Electronics of America, Inc.
MODE SELECT
FUNCTION SELECT
1
1–1
1–2
1–3
BUTTON
MODE
ENT
FLOW
2
2–1
2–2
3
3–1
3–2
4
4–1
4–2
4–3
5–1
5
5–2
5–2
is for only MRD-M1000.
*
6
6–1
6–2
7
7–1
8
8–1
8–2
9
9–1
0–1
0–2
0
1
START HERE
ENT
ENT
ENT
MODE
Toggle
Toggle
Toggle
ENT
ENT
ENT
dB
dB
1
Lower Frequency (LP)
Higher Frequency
80Hz Sample Adjustment
0dB
10Hz
20
30
40
60
100K
80
START HERE
Toggle
Toggle
ENT
ENT
T
Hz
O
S
MODE
T
E
P
ENT
ENT
3
REV. A-101502
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
(DOWN)
(UP)
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
4–4
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).
T
O
• Toggle
to "ON" and push "ENT"
S
MODE
• Push "ENT" to enter "4-2". (FREQUENCY)
T
E
• Toggle
to desired freq. and push "ENT".
P
2
• 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
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. Selection is simply
1000K
on/off except for the MRD-M1000, which has three effect levels
available for more precise tuning or personal taste.
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". Push "ENT".
• Push "ENT" to enter "5-2" (BASS COMPENSATION LEVEL).
• Toggle
to select "COMP.1", "COMP.2" or "COMP.3".
• Press "MODE" to advance to step 6 or "DISP" to exit.
2
Lower Frequency (LPF)
Higher Frequency
30Hz Sample Adjustment
0dB
10Hz
20
30
40
60
100K
START HERE
Toggle
Toggle
ENT
ENT
Hz
MODE
For Sealed
OR
ENT
ENT
For Ported
Hz
3
Lower Frequency (LP)
Higher Frequency
50Hz Sample Adjustment
0dB
10Hz
20
30
40
60
100K
Variable Width
Level
Adjustment
NOTE: When adjusting the selected frequency's
width setting, "0.5 or 1" will represent a "WIDE"
band width and "5" will represent a "NARROW"
bandwidth.
START HERE
Toggle
Toggle
ENT
ENT
ENT
For MRD-M300
OR
ENT
ENT
For MRD-M500
Hz
MODE
Toggle
ENT
ENT
ENT
START HERE
Toggle
Toggle
ENT
ENT
Mode
ENT
ENT
To find out more, visit www.alpinetechcenter.com
1000K
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1000K
dB
T
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DISP
T
X
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OR
T
P
5
T
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O
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DISP
X
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