Page 1
CONTENTS
BASIC SPECIFICATIONS . . . . . . . . . -¦-¦-¦-¦-¦-¦.-¦-¦-¦-¦-¦.... .. . .\
. . . 1
DETAILED SPECIFICATIONS . . . . . . . . . . . . . . . . . -¦-¦.-¦. . .. .. .. . . . . . 2
CONTROLS & CONNECTIONS . . . . . . . . . . . -¦-¦-¦-¦-¦.-¦-¦-¦-¦-¦. . . .\
3
OPERATION-¦-¦. . . . . .. . . . . . . . .. .. . . -¦-¦-¦-¦-¦-¦-¦-¦-¦\
-¦... . . . . . . . 5
UNIT EXPLODED VIEW . . . . -¦-¦-¦-¦-¦-¦-¦-¦-¦-¦-¦-¦-¦.-¦-¦-¦-¦.... . -¦ . 6
AMPLIFIER EXPLODED VIEW . . . . -¦-¦-¦-¦-¦-¦-¦-¦-¦-¦-¦.-¦-¦-¦.... . -¦ . 7
BLOCK DIAGRAM .. . . . . . . . . . . . . . .. . . . . -¦-¦-¦-¦.-¦-¦-¦-¦-¦-¦.. . . . \
. . 8
PS-8 TEST SET UP AND PROCEDURE . . . . . . -¦-¦-¦.-¦-¦-¦-¦-¦-¦-¦. . 9
ELECTRICAL PARTS LIST -¦-¦-¦-¦. .... . .. . . -¦-¦-¦-¦-¦-¦-¦-¦-¦-¦. . \
. . 10
PCB DRAW INGS (serial # ME0683-16316 and below) -¦-¦-¦-¦-¦-¦.. . . . . . 13
PCB DRAW INGS (serial # ME0683-16317 and above) .. .. -¦-¦-¦-¦.. . . . . . 15
IC -“ TRANSISTOR PINOUTS -¦-¦-¦-¦-¦-¦-¦-¦-¦-¦-¦-¦-¦-¦-¦-¦-¦-¦\
... . 17
SCHEMATIC DIAGRAMS (serial # ME0683-16316 and below) -¦-¦-¦.-¦. . . .18
SCHEMATIC DIAGRAMS (serial # ME0683-16317 and above). . . .. -¦.-¦. . .20
SCHEMATIC DIAGRAMS (Rev 2) . . . . . . -¦-¦-¦.-¦-¦-¦-¦-¦-¦-¦.-¦-¦-¦. . 2\
2
PACKAGE-¦-¦-¦... -¦-¦-¦-¦-¦-¦-¦-¦-¦-¦-¦-¦-¦-¦\
-¦-¦-¦-¦-¦-¦-¦-¦.-¦. .25
PS-8 SPECIFICATIONS
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 = 4.3 Ω
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)
Infinity continually strives to update and improve existing products, as well as create new ones. The specifications and
construction details in this and related Infinity publications are therefore subject to change without notice.
PS- 8
1
Page 2
INFINITY PRIMUS PS-8 100W Powered Sub/ Plate Amp
LINE VOLTAGEYes/No Hi/Lo Line Unit Notes
US 120VAC/60Hz Yes 108-132 Vrms Normal Operation
Europe 220-240VAC, 50-60Hz Yes 220-240 Vrms Normal Operation
Paramete
r Specification Unit QA Test Limit s Conditions Notes
Amp Section
Type (Class AB, D, other) AB ABn/a
Load Impedance (speaker) 4 Ohmsn/a Nominal
Rated Output Power 100 Watts95 Single input driven
THD@ Rated Power 0.5 %1 22K filter
THD @ 1 Watt 0.1 %0.5 22K filter
DC Offset 10 mV-DC50 @ Speaker Output
Damping factor >100 DF50 Measured at speaker terminals Output power 90 Watts THD 0.1 %
Input Sensitivity Input Frequency 50 Hz50 Nominal Freq.
Line Input (L&R) 171 mVrms±2dB To Rated Power Single input driven, AP Zo=600 Ohms
LFE Input 117 mVrms±2dB To Rated Power LFE input driven only, AP Zo=600 Ohms
Speaker/Hi Level Inpu 2.4 Vrms±2dB To Rated Power Single input driven
Signal to Noise
SNR-A-Weighted 100 dBA85 rel. to rated power A-Weighting filter
SNR-unweighted 80 dBr 80 rel. to rated power 22K filter
SNR @ 1W-unweighted 60 dBr 60 rel. to 1W Output 22K filter
Residual Noise Floor 1.5 mVrms 2.5 Volume @max, using RMS reading
Residual Noise Floor 1
mVrms(max) 2 Volume @max, w/ A/P Swept Bandpass
Measurement (Line freq.+ harmonics)
Input Impedance Line input L&R , LFE >10 K ohmsn/a Nominal
Speaker/Hi Level Inpu 4.7 K ohmsn/a Nominal
Filters
Low Pass (fixed or variable) Variable --±2dB
Subsonic filter (HPF) Hz±2dB
Limite
r (yes/no) NO --n/a
Features
LFE Input, Phase Switch, ATO YESfunctional
Volume pot Taper (lin/log) LOG -- functional
Input Configuration
Line In (L,R) L ,R -- functional RCA inputs: L , R Summed to Mono
Line level in LFE LFEfunctional
Spkr/Hi Level In
(L,R) L,R -- functional L R Summed to Mono
Spkr Out: Level out (L,R)Hi Pass Filter
120 VAC Version NO 120VAC version is not provided with
Spkr. Output connectors
230 VAC Version YES functional This feature exists in 230VAC Model Direct by pass from Speaker in
Signal Sensing (ATO)
Auto-Turn-On (yes/no) YES -- functional
ATO Input Frequency 50 Hz functional
ATO Level 2 mV functional 2mV@50Hz into Line Input w/ 1 ch. driven
ATO Level Speaker in 35 mV functional 35mV @ 50 Hz into the speaker input, single input driven.
ATO Turn-on time 5 ms functional Amp connected and AC on, then input signal applied
Auto Mute/ Turn-OFF Time 10 minutes functional T before muting, after signal removed Auto turn of time (T) must be 5 > T <15
Power on Delay time 3 sec. functional AC Power Applied
Transients/Pops
ATO Transient 5 mV-peak 10 @ Speaker Outputs
Turn-on Transient 50 mV-peak 100 @ Speaker Outputs AC Line cycled from OFF to ON
Turn-off Transient 50 mV-peak 100 @ Speaker Outputs AC Line cycled from ON to OFF
Efficiency
Stand-by Input Power 12 Watts 15 @ nom. line voltage Maximum allowable input power under
nominal Input voltage and frequency,
HOT or COLD operation.
Power Cons.@rated power 195 Watts 210 @ nom. line voltage 100 Watts @ 4 Ohms
Protection
Short Circuit Protection YES -- functional Direct short at output
Thermal Protection 65 deg. C -- functional @1/8 max unclipped Power Temperature rise should not exceed 35K
rise
DC Offset Protection YES -- functional DC present at Speaker Out leads Relay or crowbar (for driver/fire protection)
Line Fuse Rating External fuse with UL/SEMKO rated
holder
120 VAC 2.5 Amps Type-T or Slo Blo
230 VAC 1.25 Amps Type-T, Low breaking capacity
ALL SPECS SHOULD BE MEASURED AT NOMINAL LINE VOLTAGE.
PS- 8
2
