JBL Studio S120PII, Service Manual

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S120PII 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 Spec 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
220 Watts.
THD @ Rated Power 0.1 % 1 22k filter
THD @ 1 Watt 0.1 % 0.5 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 50 Hz 50 Nominal Freq.
L&R 425 mVrms ±2dB To 200 Watts Single input driven
LFE Mode selected 425 mVrms ±2dB To 200 Watts LFE Mode selected, single input driven
Bass Q Input 0.9 Vrms ±2dB To 200 Watts Single input driven
Speaker/Hi Level Input 5.5 Vrms ±2dB To 200 Watts Single input driven
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 65 dBr 60 relative to 1W Output 22k filter
Residual Noise Floor 1 mVrms 2
Volume @max, using RMS reading
DMM/VOM (or A/P)
Residual Noise Floor 1 mVrms(max) 2
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 fixed 50-150 Hz ± 10 2nd order variable and 2nd order fixed
Subsonic filter (HPF) 3rd Order Fixed
LFE Low pass 2nd order Fixed Hz ± 10 LFE input driven only
Limiter
THD at Max. Output Power YES n/a functional Maximum Output Power
Features --
Auto - On -Off switch YES -- functional 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
HP Speaker out functional
HP single order filter 180 Hz @ 8 Ohms, 90 Hz
@ 4 Ohms load
LFE -Normal Select switch YES -- functional Disables LP filter, intended for LFE
BassQ Input YES functional 6.3mm Phono Jack
BassQ Output YES functional Bypass, loop-through - Designed for daisy chain
Input Configuration
Line In (L,R) & LFE YES
-- functional
Dual RCA jack
Bass Q in YES
functional
6.3m phono mono 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 "
ATO Level Bass Q input 2 mV functional "
ATO Turn-on time 1 seconds functional
Amp connected and AC on, then
input signal applied
Auto Mute/ Turn-OFF Time 15 minutes 17
T before muting, after signal is
removed Auto turn of time (T) must be 10 > T < 17
Minutes
Power on Delay time 3 sec. 4 AC Power Applied
S120PII Studio Series
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