Infinity MSW-II, Service Manual

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Modulus subwoofer MSW- II 300W Powered Sub/ Plate Amp
LINE VOLTAGE Yes/No Hi/Lo Line Nom. Unit Notes
US 120vac/60Hz Yes 108-132 120 Vrms Normal Operation
EU 230vac/50-60Hz Yes 207-264 230 Vrms Normal operation, MOMS required
Parameter Specification Unit
QA Test
Limits Conditions Notes
Amp Section
Type (Class AB, D, other) D ---
Load Impedance (speaker) 4 Ohms Nominal Z-curve required
Rated Output Power 300 Watts Regulated 120 V line
THD@ Rated Power 1 % 22k filter, 50Hz 300W
THD @ 1 Watt 0.2 % 22k filter, 50Hz
DC Offset undefined mV-DC < 20 @ Speaker Outputs
Damping factor 20 N/A > 15 measured at 50 Hz
Input Sensitivity
Line/Hi Level Input Phase N/A
Line Input 400 mVrms 300 W @ 50Hz 1 input driven
Signal to Noise
SNR-A-Weighted 100 dBA relative to rated power A-Weighting filter
SNR-unweighted 70 dBr relative to rated power 22k filter
SNR rel. 1W-unweighted 60 dBr relative to 1W Output 22k filter
Residual Noise Floor 2 mVrms Volume @max, using RMS reading DMM/VOM (or A/P)
Residual Noise Floor 1
mVrms(max)
Volume @max, w/ A/P Swept Bandpass Measurement (Line freq.+ harmonics)
Input Impedance
Line Input 5 k ohms Nominal
Active Filters
Low Pass (fixed or variable)
FIXED --
Frequency 100 Hz
Slope 24 dB/Octave
Q Butterworth Damping
Subsonic filter (HPF) fixed --
Frequency 20 - 35 Hz
Slope 12 dB/Octave
Q 0.5 - 2.5 Damping
Friend Circuit FIXED --
Frequency 62.7 Hz Hz notch filter
Slope 12 dB/Octave
Q 2.5 Damping
Special filter RABOS --
Switches
Main Power On/Off Switch YES --
Type push-button -- Located on amp plate
RABOS on/off YES --
Type mini toggle --
Polarity Switch YES -- "Off": 0°; "On": 180°
Type mini toggle -- Locate at amp plate
Low Pass on/off YES
Type mini toggle -- Locate at amp plate
Limiter (yes/no) YES compressor and limiter
THD at Max. Output Power less than 2 % Maximum Output Power Maximum THD as a result of limiting.
Output Volume Control
Volume Control Pot YES -- harness for pot and LED to be remotely mounted
Taper (lin/log) log A taoer --
@ minimum setting no output
Input/Output Configuration
Line In (L,C,R,AC3,Mono) Stereo -- RCA phono jack, gold plated
LFE In YES -- Shared with "R" Line In jack
Hi Level Out YES --
Signal Sensing (ATO)
Auto-Turn-On (yes/no) YES --
ATO Input Test Frequency 100 Hz
ATO Input Threshold 2 mV typ. LPF "On", BOS "Off"
ATO Low Pass cutoff 400 Hz 450 ATO-LPF for noise immunity LPF "On", BOS "Off"
ATO Turn-on time 1 ms 10 Amp connected and AC on, then input signal applied ( 1 W output )
Auto Mute / Turn-OFF Time 10 minutes 5 < t < 15 Time before muting, after signal is removed
MSW-II
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