SW-12 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 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 250 Watts
225
1 input driven
Limiter prevents continuous power to exceed
240 Watts, amplifier delivering power in excess
of 300 Watts at 4 Ohms of load impedance.
THD @ Rated Power 0.1 %
1
22K filter
THD @ 1 Watt 0.1 %
0.2
22K filter
Dynamic Power 400 Watts
380
Power is the average measurement
of the first consecutive cycles of the
burst signal
3/20 Cycles @ 50 Hz, burst test into 4 Ohms,
input driven 6dB above its maximum sensitivity,
volume level at Maximum, RABOS Section OFF
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 14.7 mVrms
±2dB
To 1 Watt
Single input driven, Ap Zo=600 Ohms, LP ON,
RABOS OFF, Volume ctrl & crossover at max
LP Off Mode selected 14.7 mVrms
±2dB
To 1 Watt
Single input driven , Ap Zo=600 Ohms, LP OFF,
RABOS OFF, Volume ctrl & crossover at max
Speaker/Hi Level Input 0.206 Vrms
±2dB
To 1 Watt
Single input driven, Ap Zo=25 Ohms, LP ON,
RABOS OFF, Volume ctrl & crossover at max
Signal to Noise
SNR-A-Weighted 100 dBA
90
Relative to rated power A-Weighting filter
SNR-unweighted 90 dBr
85
Relative to rated power 22K filter
SNR rel. 1W-unweighted 60 dBr
55
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
n/a
Nominal
Speaker/Hi Level Input 10K ohms
n/a
Nominal
Filters
LP 4th order variable 50-150 Hz
± 10
Subsonic filter (HPF) 2nd 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 n/a functional
Features --
Auto - On -Off YES --
functional
No switch to select the ATO mode is 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
SW-12
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