Fostex Speaker PM SUBN User Manual

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
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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.  
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