JBL LS Series, Руководство по обслуживанию

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JBL LS Sub 250W Powered Sub 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 207-253 230 Vrms Normal operation, MOMS
Parameter Specification Unit QA Test Limits Conditions Notes
Amp Section
Type (Class AB, D, other) D n/a n/a
Load Impedance (Driver min)
4 Ohms n/a Nominal
System average impedance from
20 to 500 Hz
8.65 Ohms n/a Reference
Driver size 12 inches n/a Reference
Rated Output Power (120VAC) 250 Watts 240 Domestic version only 120
Rated Output Power (230VAC) 269 Watts 250
EU Version only 230
VAC-50-60 Hz
AVG RMS Dynamic Power 210 Watts 270
Average RMS power, 3/20
Cycles 50 Hz, Driven 6dB
above its input sensitivity
sensitivity, average of the first
THD @ Rated Power 0.5 % 1 22k filter
THD @ 1 Watt 0.2 % 0.5 22k filter
DC Offset 50 mV-DC 50 @ Speaker Outputs
Damping factor >50 DF 20
Measured at
amplifier board Measured at the speaker
cable. 150 Watts @ THD <
Input Sensitivity
Input Frequency 50 Hz 50 Nominal Freq.
L&R 22 mVrms ±1dB To 1 Watt Single input driven
LFE input 22 mVrms ±1dB To 1 Watt Single input driven, LFE switch
System Gain 90.9 n/a Reference Single input driven Normal
System Gain in dB 39.17 dB Reference Single input driven Normal
Signal to Noise
SNR-A-Weighted 100 dBA 95 relative to rated A-Weighting filter
SNR-unweighted 90 dBr 85 relative to rated 22K filter
SNR rel. 1W-unweighted 65 dBr 60 relative to 1W 22K filter
Residual Noise Floor 1.5 mVrms(max) 2
Volume @max, w/
A/P Swept
Bandpass
Line level inputs must be
terminated using 1KOHM
Input Impedance
Line Input (L, R,LFE) 10K ohms n/a Nominal
Filters
LP filter Variable 50-150 Hz ± 10 4th order variable (24dB/oct)
Subsonic filter (HPF) 2rd Order
Fixed
Friend circuit Fixed
LFE Low pass 200>LP<500 Hz LFE input driven
Limiter
THD at Max. Output Power N/A N/A functional Maximum Output Maximum THD as a result of
Features --
Volume pot Taper (lin/log) LOG -- functional A Taper
Phase switch
0-180 deg functional
LP Filter defeat switch YES functional Disables LP filter, intended for
Input Configuration
Line In (L,R)
YES -- functional
LFE use either L or
R inputs, LFE
switch must be
Dual RCA jack
Signal Sensing (ATO)
Auto-Turn-On (yes/no)
YES functional
ATO Input test frequency 50 Hz functional
ATO Level L, R or LFE Mode 1.5 mV functional Maximum acceptable level.
ATO Turn-on time 5 ms functional
Amp connected and
AC on, then input
Auto Mute/ Turn-OFF Time 5-15 minutes 5-15
T before muting,
after signal is Auto turn of time (T) must be
5 > T < 15 Minutes
2
LS120P