Infinity HTS-20, Service Manual

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DETAILED SPECIFICATIONS
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
Asia 100vac/50Hz No 90-110 100 Vrms Normal Operation
Parameter Specific
ation
Unit QA Test
Limits
Conditions Notes
Amp Section
Type (Class AB, D,
other)
D n/a n/a Class D Preferred...Sink
required for Class AB
Load Impedance
(speaker)
4 Ohms n/a Nominal Z-curve required
Rated Output Power 150 Watts 150 1 input driven
THD 0.3 % 1 22k filter 75w (Power Bandwidth
30-100Hz)
THD @ 1 Watt 0.5 % 0.8 22k filter
DC Offset 10 mV-DC 20 @ Speaker Outputs
Damping factor 100 DF 50
Input Sensitivity
Input Frequency 40 Hz Nominal Freq. 1 input driven
Line Input 63 mVrms ±2dB To Rated Power/ Vol @
Max
1 input driven: AP source
Z = 600 ohms
Speaker/Hi Level Input 4.8 Vrms ±2dB To Rated Power/ Vol @
Max
1 input driven: AP source
Z = 25 ohms
Signal to Noise
SNR-A-Weighted 100 dBA 90 Relative to rated output A-Weighting filter
SNR-unweighted 75 dBr 70 Relative to rated output 22k filter
SNR rel. 1W-unweighted 65 dBr 55 relative to 1W Output 22k filter
Residual Noise Floor 3 mVrms 4 Volume @max, using
RMS reading on A/P
22k filter required due to
100kHz switching noise
present at speaker output
Input Impedance
Line Input 10k ohms n/a Nominal
Speaker/Hi Level Input 200 ohms n/a Nominal
Filters 0dBr = 1w @ 50Hz
Low Pass (fixed or
variable)
Variable
Low Pass filter (point or
range)
50-150 Hz ±2dB -3dB Point
Slope 18-24 dB/Octav
e
n/a
Subsonic filter (HPF) 34 Hz ±2dB -3dB Point
Slope 24 dB/Octav
e
n/a
4
Amplifier/Subwoofer
BU-120/HTS-20