Detailed Specifications - Infinity Alpha 1200s Service Manual

Alpha 1200s
Alpha 1200s Powered Sub/ Plate Amp
LINE VOLTAGE
US 120vac/60Hz
EU 230vac/50-60Hz
Parameter Specification
Amp Section
Type (Class AB, D, other)
Load Impedance (speaker)
Rated Output Power
THD @ Rated Power
THD @ 1 Watt
DC Offset
Damping factor
Input Sensitivity
Input Frequency
L&R
LP Off Mode selected
Speaker/Hi Level Input
Signal to Noise
SNR-A-Weighted
SNR-unweighted
SNR rel. 1W-unweighted
Residual Noise Floor
Residual Noise Floor
Input Impedance
Line Input (L, R,LFE)
Speaker/Hi Level Input
Filters
LP 4th order variable
Subsonic filter (HPF) 3rd Orde
Low pass filter OFF
BOS
Frequency Control
Range
Level Control
Range
Width(Q) Control
Range
Limiter
THD at Max. Output Power
Features
Auto - On -Off
Phase switch
Volume pot Taper (lin/log)
Variable crossover 50-150 Hz
HP Speaker out
LP On- Off Select switch
Input Configuration
Line In (L,R) & LFE
Spkr/Hi Level In
Signal Sensing (ATO)
Auto-Turn-On (yes/no)
ATO Input test frequency
ATO Level LFE Input
ATO Level Speaker in
Yes/No Hi/Lo Line Nom.
Yes 108-132 120
Yes 207-264 230
QA Test
Unit
Limits
D n/a n/a
6 Ohms n/a
275 Watts 220
0.1 % 1
0.1 % 0.2
10 mV-DC 60
>50 DF 23
30 Hz 30
446 mVrms ±2dB
446 mVrms ±2dB
6.225 Vrms ±2dB
100 dBA 85
90 dBr 85
55 dBr 50
0.5 mVrms 1
0.5 mVrms(max) 1
10K ohms
10K ohms
50-150 Hz ± 10
Fixed Hz ± 10
Fixed Hz ± 10
--
20-80 Hz functional 21 detent pot (0.1 oct. steps)
-- --
-14.1 to 0 dB functional 21 detent pot (0.5dB steps)
-- --
4.5% to 49.5% octave functional 21 detent pot (5steps/0.1 octave)
YES functional Maximum Output Power
--
YES -- functional
0-180 deg functional
LOG -- functional
YES functional
YES functional
YES -- functional
YES -- functional
YES -- functional
YES functional Auto - on selection switch in Auto
50 Hz functional
2 mV functional
50 mV functional
Unit
Vrms
Vrms
Conditions
Nominal
1 input driven
22k filter
22k filter
@ Speaker Outputs
Measured at amplifier board
Nominal Freq.
To 200 Watts
To 200 Watts
To 200 Watts
relative to rated power
relative to rated power
relative to 1W Output
Volume @max, using RMS reading
DMM/VOM (or A/P)
Volume @max, w/ A/P Swept
Bandpass Measurement (Line
freq.+ harmonics)
Nominal
Nominal
L or R input driven, LP Filter OFF
"
"
"
2
Notes
Normal Operation
Normal operation, MOMS required
Notes
Bridge type amplifier, None of the speaker
terminals must be connected to system GND at
any time.
Limiter prevents continuous power to exceed 240
Watts.
Measured at the speaker cable. 200 Watts,
measured at speaker output terminals located at
the amp board.
Single input driven, Ap Zo=600 Ohms, LP ON
Single input driven , Ap Zo=600 Ohms, LP OFF
Single input driven, Ap Zo=600 Ohms, LP ON
A-Weighting filter
22k filter
22k filter
No switch provided, Refer to ATO section
A Taper
4th Order LP Variable crossover
Pass Through from the speaker input section
Disables LP filter, intended for LFE
Dual RCA jack
Binding post connector L&R