JBL STUDIO L8400P, Service Manual

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L8400P 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) 4 Ohms
n/a Nominal
Rated Output Power 450 Watts
380 1 input driven Measuring 425 Watts Cold
THD @ Rated Power 0.5 %
1 22K filter
THD @ 1 Watt 0.1 % 0.2 22K filter
Dynamic Power 460 Watts 450
Power is the average measurement
of the first four consecutive peaks
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.
DC Offset 80 mV-DC 100 @ Speaker Outputs
Damping factor >20 DF 15 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 30 Nominal Freq.
Left or Right inputs 16.6 mVrms
±2dB To 1 Watt
Single input driven, Ap Zo=600 Ohms, LP
ON, Volume ctrl & crossover at max
Left & Right with LFE or LP
filter OFF Mode selected
16.6 mVrms
±2dB To 1 Watt
Single input driven , Ap Zo=600 Ohms, LP
OFF, Volume ctrl & crossover at max
Speaker/Hi Level Input 165 mVrms ±2dB To 1 Watt
Single input driven, Ap Zo=25 Ohms,
Normal, Volume ctrl & crossover at max
Signal to Noise
SNR-A-Weighted 100 dBA 90 Relative to rated power (400 Watts) A-Weighting filter
SNR-unweighted 95 dBr 85 Relative to rated power (400 Watts) 22K filter
SNR rel. 1W-unweighted 70 dBr 65 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)
Speaker input rejection
1.0V + RMS applied to + & - inputs
CMRR Speaker in >37 dB Reference
50 Hz, Generator GND to system
GND
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) 3rd Orde Fixed Hz ± 10
Low pass filter OFF Fixed Hz ± 20 L or R input driven, LP Filter OFF
HP Speaker output 4 Ohms 200 Hz ± 10 Speaker output loaded with 4 Ohms
HP Speaker output 8 Ohms 100 Hz
± 10 Speaker output loaded with 8 Ohms
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
L
8400P L series
3