Alpine MRD-M300, MRD-M500 owner manual Subsonic Subsonic Filter

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

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 "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.

START HERE

ENT

	Toggle			Toggle
ENT			ENT
				Hz		T
						O
						S
					MODE
		For Sealed				T
						E
			OR			P
ENT
		For Ported				4
				Hz

STEP 4. (4) PARAMETRIC EQ (Frequency, Width (Q), and Level)

3 Lower Frequency

(LP)

Higher Frequency

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

50Hz

Sample Adjustment

the EQ band is user selectable, allowing it to be custom tailored

0dB

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

10Hz 20 30

40 60

100K

1000K

vehicle. When set to its widest setting, this can also function as

an overall gain adjustment.

Level

Variable

Width

NOTE: When adjusting the selected frequency's

Adjustment

width setting, "0.5 or 1" will represent a "WIDE"

SETTING THE PARAMETRIC EQ

band width and "5" will represent a "NARROW"

• You should be in mode "4" (PARAMETRIC EQ) now

bandwidth.

Toggle

Toggle

from the previous step.

START HERE

• Push "ENT" to enter the adjustment menu.

ENT

ENT

ENT

• Push "ENT" to enter "4-1" (ON/OFF).

• Toggle

to "ON" and push "ENT"

dB

• Push "ENT" to enter "4-2". (FREQUENCY)

For MRD-M300

• Toggle

to desired freq. and push "ENT".

ENT

ENT

For MRD-M500

O

O

OR

T

T

• Push "ENT" to enter "4-3". (WIDTH)

Hz

S

DISP

E

• Toggle

to attain the desired width

MODE

T

X

P

OR

T

E

I

(note: a lower

Q Value= Wider,

Toggle

5

a higher Q value = more narrow)

ENT

ENT

ENT

• 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 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.

			START HERE
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".		ENT
• Press	"MODE"	to advance to step 6 or "DISP" to exit.

ENT

Toggle

Mode

T
O
S
		DISP
T
E	OR
P
6

T

O

E X I T

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