Frequency Response: 35Hz – 150Hz (±3dB)
Maximum Amplifier Output: 100 watts RMS (20Hz – 150Hz with no more than 0.1% THD)
Crossover Frequencies: 50Hz – 150Hz, 24dB/octave, continuously variable
Driver: 8" (203mm) MMD™ DCR = 4.3Ω
Dimensions 17-1/2" x 10-5/8" x 16-3/4" (H x W x D)
(445mm x 270mm x 426mm)
Weight: 33 lb (15kg)
Infinit y cont inually stri ves to update and improve existing products, as well as create new ones. The specificati ons and
construction detail s i n this and related Infini t y publ ications are therefore subject to change without notice.
Page 3
r
s
r
PS-8
2
INFINITY PRIMUS PS-8 100W Powered Sub/ Plate Amp
LINE VOLTAGEYes/NoHi/Lo LineUnitNotes
Europe 220-240VAC, 50-60HzYes220-240VrmsNormal Operation
SNR-A-Weighted100 dBA85rel. to rated powerA-Weighting filter
SNR-unweighted80 dBr80rel. to rated power22K filter
SNR @ 1W-unweighted60 dBr60rel. to 1W Output22K filter
Residual Noise Floor1.5 mVrms2.5Volume @max, using RMS reading
Residual Noise Floor1
Input Impedance
Filters
Low Pass (fixed or variable)Variable--±2dB
Subsonic filter (HPF)Hz±2dB
Limite
Features
LFE Input, Phase Switch, ATOYESfunctional
Volume pot Taper (lin/log)LOG--functional
Input Configuration
Line In (L,R)L ,R--functionalRCA inputs: L , R Summed to Mono
Line level in LFELFEfunctional
Spkr/Hi Level In
Spkr Out: Level out (L,R)Hi Pass Filter
120 VAC VersionNO
230 VAC VersionYESfunctionalThis feature exists in 230VAC ModelDirect by pass from Speaker in
Signal Sensing (ATO)
Auto-Turn-On (yes/no)YES--functional
ATO Input Frequency50 Hzfunctional
ATO Level2 mVfunctional2mV@50Hz into Line Input w/ 1 ch. driven
ATO Level Speaker in35 mVfunctional35mV @ 50 Hz into the speaker input, single input driven.
ATO Turn-on time5 msfunctionalAmp connected and AC on, then input signal applied
Auto Mute/ Turn-OFF Time10 minutesfunctionalT before muting, after signal removedAuto turn of time (T) must be 5 > T <15
Power on Delay time3 sec.functionalAC Power Applied
Transients/Pops
ATO Transient5 mV-peak10@ Speaker Outputs
Turn-on Transient50 mV-peak100@ Speaker OutputsAC Line cycled from OFF to ON
Turn-off Transient50 mV-peak100@ Speaker OutputsAC Line cycled from ON to OFF
Efficiency
Stand-by Input Power12 Watts15@ nom. line voltage
Power Cons.@rated power195 Watts210@ nom. line voltage100 Watts @ 4 Ohms
Protection
Short Circuit Protection YES--functionalDirect short at output
Thermal Protection 65 deg. C--functional@1/8 max unclipped Power
DC Offset ProtectionYES--functionalDC present at Speaker Out leadsRelay or crowbar (for driver/fire protection)
120VAC version is not provided with
Spkr. Output connectors
ConditionsNotes
Maximum allowable input power under
nominal Input voltage and frequency,
HOT or COLD operation.
Temperature rise should not exceed 35K
rise
External fuse with UL/SEMKO rated
holder
Page 4
PS-8
Rear Panel
CONTROLS AND CONNECTIONS
¡
Subwoofer-Level Control
™
Crossover Adjustment
£
Phase Switch
¢
LFE Input
∞
Line-Level Inputs
§
High-Level Inputs
¶
Power Switch
PS-8
3
£
¡
™
¢
HIGH LEVEL INPUT
+
–
L R
∞
§
¶
AC
FUSE
T 2.5A L 250V
TYPE
~
120V
60HZ
200 Watts
Page 5
If your receiver/processor does
not have subwoofer outputs for
the left and right channels or an
LFE output,connect speaker
wire from your receiver/amplifier
to your speakers and subwoofer
using two sets of speaker wire:
PS-8
If you have a Dolby* Digital or DTS®receiver/processor with a
low-frequency-effects (LFE) or subwoofer output:
SUBWOOFER OR
LFE OUTPUT
+ +
OUT IN
If your receiver/processor does not contain a Dolby Digital or DTS
processor but has a subwoofer output:
NOTE:
Some receivers have one subwoofer output.
In that case,it is recommended that you use a Y connector
(not included) to maximize performance.
+ +
OUT IN
RECEIVER/PROCESSOR
L R
SUBWOOFER CONNECTIONS
CHOOSE THE SUBWOOFER CONNECTION THAT IS MOST SUITABLE FOR YOUR RECEIVER/PROCESSOR
LOOSEN TERMINALS
INSERT BARE END;
TIGHTEN TERMINALS
1.
2.
BLACK =
–
NO STRIPE = –STRIPE =
+
RED =
+
This figure shows how to connect bare wires
to the terminals.
RECEIVER/AMPLIFIER
Front Speaker Output
+
–
HIGH LEVEL INPUT
L R
PS-8
4
Page 6
PS-8
OPERATION
Power On
Plug your subwoofer’sAC cord into a wall outlet.Do not use
the outlets on the back of the receiver.
Initially set the Subwoofer-Level Control
¡
to the
“min”position.
Turn on your sub by pressing the Power Switch
¶
on
the rear panel.
Turn on your entire audio system and start a CD or movie
sound-track at a moderate level.
Auto On/Standby
With the Power Switch ¶in the ON position,the LED on the
front panel will remain lit in red or green to indicate the
On/Standby mode of the subwoofer.
RED = STANDBY (No signal detected,Amp Off)
GREEN = ON (Signal detected,Amp On)
The subwoofer will automatically enter the Standby mode after
approximately 10 minutes when no signal is detected from your
system. The subwoofer will then power ON instantly when a
signal is detected.During periods of normal use,the Power
Switch
¶
can be left on.You may turn off the Power Switch
¶
for extended periods of nonoperation,e.g.,when you are
away on vacation.
Adjust Level
Turn your Subwoofer-Level Control ¡up to the “5”position
(halfway).If no sound emanates from the subwoofer,check the ACline cord and input cables.Are the connectors on the cables
making proper contact? Is the AC plug connected to a “live”
receptacle? Has the Power Switch
¶
been pressed to the “On”
position? Once you have confirmed that the subwoofer is active,
proceed by playing a CD,record or cassette.Use a selection that
has ample bass information.
Set the overall volume control of the preamplifier or stereo to a
comfortable level.Adjust the Subwoofer-Level Control
¡
until
you obtain a pleasing blend of bass.Bass response should not
overpower the room but rather be adjusted so there is a
harmonious blend across the entire musical range.Many
users have a tendency to set the subwoofer volume too loud,
adhering to the belief that a subwoofer is there to produce lots
of bass.This is not entirely true.A subwoofer is there to enhance
bass,e xtending the response of the entire system so the bass
can be felt as well as heard.However,overall balance must
be maintained or the music will not sound natural.An
experienced listener will set the volume of the subwoofer so its
impact on bass response is always there but never obtrusive.
Phase Control
The Phase Switch £ determines whether the subwoofer
speaker’s piston-like action moves in and out with the main
speakers,0,˚or opposite the main speakers,180.˚Proper phase
adjustment depends on several variables such as room size,
subwoofer placement and listener position.Adjust the phase
switch to maximize bass output at the listening position.
Crossover Adjustments
The Crossover Adjustment control ™ determines the highest
frequency at which the subwoofer reproduces sounds.If your main
speakers can comfortably reproduce some low-frequency sounds,
set this control to a lower frequency setting,between 50Hz
and 100Hz. This will concentrate the subwoofer’s efforts on the
ultradeep bass sounds required by today’s films and music.If you
are using smaller bookshelf speakers that do not extend to the
lower bass frequencies,set the Crossover Adjustment control to
a higher setting,between 120Hz and 150Hz.
NOTE:This control will have no effect if the LFE Input
¢ is used.
If you have a Dolby Digital or DTS processor/receiver,the Low-Pass
Frequency is set by the processor/receiver. Consult your owner’s
manual to learn how to view or change this setting.
6 PS-8 Cabinet Not for sale 1
7 PS-8 Amplifier Not for sale 1
8 Screw (Amplifier) 352-AM04020D210 10
9 Port Tube 249-HIPS-01003 2
10 Foot Pad 320-RUB-00199 4
11 Screw (Foot) 352-CM04025D604 4
12 Feet (Main) 320-ABS-00195 4
13 Logo 316-ABS-00532 1
Page 8
PS-8
7
PS-8 AMPLIFIER EXPLODED VIEW
Page 9
PS-8
8
Page 10
PS-8
9
PS-8 Test Set Up and Procedure
SYSTEM AURAL SWEEP TEST
Equipment needed:
• Function/signal generator/sweep generator
• Integrated Amplifier
• Multimeter
• Speaker cables
General Unit Function (UUT = Unit Under Test)
Switches/knobs on the amplifier faceplate:
Low Pass Frequency Adjust full CW (150Hz)
Phase switch – either position
1. From the signal generator, Connect both right and left line level inputs (RCA) – not the LFE jack - to signal
generator and UUT. Use Y-cable if necessary from mono source.
2. On the amplifier, turn the LEVEL control full Counterclockwise (Min).
3. Turn on generator, adjust to 75mV, 50 Hz.
4. Plug in UUT; turn the power switch ON. Turn LEVEL control full Clockwise (Max).
5. LED should now be Green; immediate bass response should be heard and felt from rear port tube opening.
6. Turn off generator, turn LEVEL control fully Counterclockwise (Min), disconnect RCA cable.
7. Connect one pair of speaker cables to one set of High Level input terminals on UUT. Cables should be
connected to an integrated amplifier fed by the signal generator.
8. Turn on generator and adjust so that speaker level input at the amplifier is 1.5V, 50 Hz. Turn LEVEL control
full Clockwise (Max).
9. Green LED should light; immediate bass response should be heard and felt from the port tube opening.
Sweep Function
1. Follow steps 7-10 above, using a sweep generator as a signal source.
2. Sweep generator from 20Hz to 1kHz. Listen to the cabinet and drivers for any rattles, clicks, buzzes or
any other noises. If any unusual noises are heard, remove woofer and test.
Driver Function (Woofer)
1. Remove woofer from cabinet; detach + and - wire clips.
2. Check DC resistance of woofer; it should be
3. Connect a pair of speaker cables to driver terminals. Cables should be connected to an integrated
amplifier fed by a signal generator. Turn on generator and adjust so that speaker level output is 5.0V.
4. Sweep generator from 20Hz to 1kHz. Listen to driver for any rubbing, buzzing, or other unusual noises.
4.5 ohms±10%.
Page 11
2
PS-8 (serial # ME0683-16316 and below)
10
PS-8 Electrical Parts List (See addendum for serial # ME0683-16317 and above)