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