Owner’s Manual
Active Sub Woofer
Thank you for purchasing the Fostex PM-SUBn. The PM-SUBn is an active sub woofer
which widens and strengthens the shortage of low frequency region and volume level
reproduced by a small speaker system. It can be used for various applications such as
DTM and home theater.
FOSTEX CO.
3-2-35 Musashino, Akishima-shi, Tokyo, Japan, 196-0021
© PRINTED IN CHINA JUN. 2011 532956
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Characteristics Chart
Output sound pressure level measured in the anechoic room
The LOW-PASS FREQ. control knob adjusts the frequency curve as shown in the graph below. The
characteristics are measured with PM-SUBn in sole use.
Main Features
Active sub woofer with a closed cabinet optimized for PM0.4n
The enclosure volume is downsized by 25% comparing to PM0.5SUB (MK2). This allows PM-SUBn to install
more flexibly. With the closed cabinet, you do not have to pay attention to the bass-reflex enclosure duct direction.
•PM-SUBn Output sound pressure level characteristics
•PM-SUBn setting
A long-stroke 20-cm speaker unit exclusively designed as a sub woofer
A light BKP (Bleached Kraft Pulp) and strong Kevlar fiber mixed material is used for the cone paper of the
speaker. Also a highly durable, light and high internal-loss SBR system foamed rubber is used for the speaker
surrounding.
Characteristic
A closed wooden cabinet with a shining front baffle painted in glossy-black and optimized stiffness establishes
a high-quality sound reproduction.
Characteristic
Characteristic
Driving a sub woofer with 68W high-power amplifier
The RCA pin and phone are employed for the INPUT/THRU OUT jacks. The stereo RCA pin cable (1.5 m),
stereo mini - RCA pin cable (1.5 m) and 2 x phone - phone cables (2 m) are provided as standard accessories.
Without purchasing extra cables, you can connect PM0.4n/PM0.5n and PC with PM-SUBn. The volume,
cross-over frequency (50 ~ 150 Hz) and the phase (0º or 180º) can be adjusted for your usage environment.
10 20
50 100 200
500 1k 2k
5k 10k 20kHz
The graphs below show the characteristics when PM-SUBn is connected to PM0.4n and PM0.5n. Setting the
PM-SUBn SUBWOOFER VOLUME and LOW-PASS FREQ. at the position below achieves the best sound
performance indicated by the thick line in the graph. The output sound pressure varies depending on room
acoustic characteristics and the PM-SUBn/main speaker system installation position. Referring to the setting
example, set the best volume position so that the low frequency output from both PM-SUBn and the main speaker
system is coordinated.
PM-SUBn can be used for various applications such as DTM and home theater.
Specifications
•PM0.4n + PM-SUBn characteristics
•PM0.5n + PM-SUBn characteristics
●Type
: Sub woofer with built-in power amplifier
PM0.4n
●Amplifier Section
•Rated Output
PM0.5n
: 68 W
•Input Sensitivity
•Input Impedance
•Output Terminal (THRU OUT)
•Functions
: 100 mV
: 20 kΩ or more (No signal is connected to THRU OUT.)
: ø6 mm TS phone jack, RCA pin jack
: Phase switch (0°/180°), cross-over frequency adjustment (50 ~ 150 Hz),
volume
PM-SUBn
PM-SUBn
●Speaker Section
•Type
•Speaker Unit
•Impedance
●Power
10 20
50 100 200
500 1k 2k
5k 10k 20kHz
10 20
50 100 200
500 1k 2k
5k 10k 20 kHz
: Closed type acoustic suspension
: 20 cm cone type (simplified magnetic shield)
: 8 Ω
: AC120 V / 60 Hz, AC230 V / 50/60 Hz, 60 W
: 300 (W) x 301.2 (H) x 364 (D) mm
: About 11.6 kg
•PM0.4n volume setting: Max
•PM-SUBn setting
•PM0.5n volume setting: Half
•PM-SUBn setting
●Dimensions
●Weight
●Standard Accessories
: Stereo RCA pin cable (1.5 m), stereo mini - RCA pin cable (1.5 m),
white phone - phone cables (2 m), red phone - phone cables (2 m)
Product improvement may warrant a change of specifications, newer materials or cosmetics. Changes in specifications and
features may be made without notice or obligations.
About switching PHASE
Dimensions
The sound pressure level varies between the 0º and 180º PHASE SW position. In a normal environment, setting
the PHASE SW at 0º rather achieves a flat characteristic. However, depending on an installation position and a
distance between PM-SUBn and the main speaker system, there is a case that setting the PHASE SW at 180º
realizes a smoother reproduction from low to high frequency region.
•PM0.4n + PM-SUBn phase characteristics
•PM0.5n + PM-SUBn phase characteristics
0°
0°
180°
180°
333
364
31
300
10 20
50 100 200
500 1k 2k
5k 10k 20kHz
10 20
50 100 200
500 1k 2k
5k 10k 20kHz
6
3
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Connection Method
Names & Functions
Connecting PM-SUBn to PM0.4n (x 2 units)
1. Power indicator
Connect a stereo signal source from PC/portable music player to the PM-SUBn INPUT terminals (L, R). Next,
connect the PM-SUBn THRU terminal (L, R) to a pair of PM0.4n INPUT terminals. The connection is the same
when PM0.5n is used as a main speaker system.
It indicates the built-in power amplifier power on/off
condition. It is lit when turning on the [POWER] switch.
It is unlit when turning off the [POWER] switch.
PM0.4n
(R channel)
2. [INPUT] terminals
Provided phone-phone
cable (white)
Provided phone-phone
cable (red)
A signal source output from PC/portable music player or
a line level signal output from an amplifier is connected
to the [INPUT] terminals. If the signal source is
connected to the PHONE jack, the signal source fed to
the RCA terminal is cut.
PM0.4n
(L channel)
3. [THRU OUT] terminal
When a volume controller is used;
1. Connect a signal source to PC-1
using a stereo mini cable.
A signal fed to the [INPUT] terminal is output from the
[THRU OUT] terminal regardless of the power switch
on/off condition. If the signal is taken out from the
PHONE terminal, the signal source output from the RCA
terminal is cut.
THRU OUT terminals
1
The THRU OUT terminals output signals
fed to the INPUT terminals regardless of
the PM-SUBn power switch on/off
condition. If the phone plug is connected to
the THRU OUT PHONE jack, the signal
fed to the THRU OUT RCA jack is cut.
2. Connect the PC-1’s RCA OUT
(L, R) to the PM-SUBn RCA
INPUT (L, R) using the RCA pin
cable provided with PC-1.
3. Referring to the explanation
mentioned in the page 7 of this
manual, adjust the PM-SUBn
SUB WOOFER volume and the
PM0.4n volume. PC-1 can adjust
b o t h t h e P M - S U B n a n d t h e
PM0.4n volume level.
Connect one of the
music source.
2
3
4 5 6
4. [PHASE 0º, 180º ] switch
This switch changes the sub woofer phase between 0º
and 180º.
Provided stereo mini
-RCA cable
Provided RCA
pin cable
PC
Provided stereo mini
-RCA cable
5. [SUB WOOFER VOLUME] adjusting knob
It adjusts the output level of PM-SUBn.
Amplifier /
Recording mixer, etc.
6. [LOW-PASS FREQ.] adjusting knob
It adjusts the cross-over frequency of the low-pass filter
from 50 to 150 Hz.
Portable music player
PC-1 volume controller
7
8
9
Make sure to power off
the amplifier and then
connect the cables.
Connecting PM-SUBn (x 2 units) to PM0.4n (x 2 units)
Using 2 units of PM-SUBn improves the low sound massiveness. Also L and
R independent signals allow more realistic sound reproduction.
7. Heat sink
<CAUTION>
When this unit is used for a long time, the heat sink
heats up. Do not touch it with a bare hand. You
might suffer a burn. Please place the unit in order
not to bother the heat sink radiation.
PM0.4n placed on the L side
PM0.4n placed on the R side
Connect a signal source L channel
output to the PM-SUBn INPUT
(L) terminal. Then, Connect the
PM-SUBn THRU OUT (L) to the
input terminal of PM0.4n placed
on the L channel side.
Connect a signal source R channel
output to the PM-SUBn INPUT
(R) terminal. Then, Connect the
PM-SUBn THRU OUT (R) to the
input terminal of PM0.4n placed
on the R channel side.
8. [POWER] switch
Power off and on the built-in power amplifier. When
powering off/on, fully turn down both the PM-SUBn
[SUB WOOFER VOLUME] and the connected powered
speaker output volume.
Provided phone-phone
cable (red)
Provided phone-phone
cable (white)
9. AC cable
Caution When Cleaning
Cleaning the front baffle/enclosure with caution.
• If there are marks attached on the enclosure surface, squeeze a soft cloth steeped into a watered-down neutral
detergent and wipe the surface with the cloth.
• If dust is attached on the speaker unit surface, sweep it lightly using a duster. Do not touch the unit surface
directly with your hand or clean it with a wet wiping cloth.
4
5
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