Read JBL ES 250P (serv.man2) Service Manual online
JBL ES250P 250W Powered Sub Amp
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 required
Parameter
Specification
Unit
QA Test
Limits
Conditions
Notes
Amp Section
Type (Class AB, D, other)
Type (Class AB, D, other)
D
n/a
n/a
Load Impedance (speaker)
4
Ohms
n/a
Nominal
AVG System impedance
7
Ohms
n/a
AP Computed BW from 20 to
500Hz
Rated Output Power (120VAC)
250
Watts
250
Domestic version only 120 VAC-60 Hz
AVG RMS Dynamic Power
509
Watts
200
217mV driven into a single input
Average RMS power, 3/20 Cycles 50 Hz, Driven
6dB above its input sensitivity , average of the
first 4 consecutive peaks
THD @ Rated Power
0.5
%
1
22k filter
THD @ 1 Watt
0.2
%
0.3
22k filter
DC Offset
10
mV-DC
30
@ Speaker Outputs
Damping factor
>50
DF
20
Measured at amplifier board 90%
of full power
Measured at the speaker cable. 225 Watts @
THD < 0.1 % @ 50 Hz
Input Sensitivity
Input Frequency
Input Frequency
50
Hz
50
Nominal Freq.
L&R
7
mVrms
±1dB
To 1 Watt
Single input driven
LFE input
7
mVrms
±1dB
To 1 Watt
Single input driven, LFE switch ON
System Gain
49
dB
Reference
Single input driven Normal or LFE mode
Signal to Noise
SNR-A-Weighted
SNR-A-Weighted
90
dBA
85
relative to 1W
A-Weighting filter
SNR-unweighted
80
dBr
75
relative to 1W
22K filter
Residual Noise Floor
<2.0
mVrms(max)
2.5
Volume @max, w/ A/P Swept
Bandpass Measurement (Line
freq.+ harmonics) (BW=20 KHz)
Line level inputs must be terminated using
1KOHM
Input Impedance
Line Input (L, R,LFE)
Line Input (L, R,LFE)
10K
ohms
n/a
Nominal
Filters
LP filter Variable
LP filter Variable
50-150
Hz
± 10
4th Order variable-24 db/Octave
Subsonic filter (HPF) 2nd Order
Fixed
Friend circuit
Fixed
LFE Low pass
200>LP<500 Hz
LFE input driven only
Limiter
THD at Max. Output Power
13
%
functional
Drive unit 6dB above the required
level to obtain full power
Approximately 208mV
Maximum THD as a result of limiting.
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 LFE
Input Configuration
Line In (L,R) & LFE
Line In (L,R) & LFE
YES
--
functional
Dual RCA jack
Signal Sensing (ATO)
Auto-Turn-On (yes/no)
Auto-Turn-On (yes/no)
YES
functional
ATO Input test frequency
50
Hz
functional
ATO Level LFE Input
2
mV
functional
Maximum acceptable level.
ATO Turn-on time
5
ms
functional
Amp connected and AC on, then
input signal applied
Auto Mute/ Turn-OFF Time
5-15
minutes
5-15
T before muting, after signal is
removed
Auto turn of time (T) must be 5 > T < 15
Minutes
Power on Delay time
3
sec.
4
AC Power Applied
Transients/Pops
ATO Transient
0.5
V-peak
0.5V
@ Speaker Output
Amplifier activated by signal presence at the
Line input
Turn-on Transient
0.5
V-peak
0.8V
@ Speaker Output
AC Line cycled from OFF to ON
ES250P
JBL ES 250P
Service Manual
Page 12 of 30
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