JBL 1500 ARRAY, Service Manual

1500 Array 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

 Asia 100VAC/50Hz

YES

90-110

100

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)

8

Ohms

n/a

Nominal

Rated Output Power

650

Watts

593

1 input driven

Test frequency 100 Hz

THD @ Rated Power

0.5

%

1

22K filter

THD @ 1 Watt

0.1

%

0.2

22K filter

Dynamic Power

700

Watts

690

Power is the average measurement 
of the first four consecutive peaks of 
the burst signal

3/20 Cycles @ 50 Hz, burst test into 8 Ohms, input 
driven with  800mV RMS

DC Offset

20

mV-DC

100

@ Speaker Outputs

Damping factor

>20

DF

15

Measured at amplifier board 

Measured at the speaker cable.  500 Watts, 
measured at speaker output terminals located at the
amp board.

Input Sensitivity

Input Frequency

100

Hz

100

Nominal Freq.

Line level input 

11.69

mVrms

±2dB

To 1 Watt

Single input driven, Ap Zo=600 Ohms, LFE mode,   
Volume ctrl. at max.

Signal to Noise

SNR-A-Weighted

100

dBA

95

Relative to rated power (650 Watts) A-Weighting filter

SNR-unweighted

95

dBr

90

Relative to rated power (650 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, LFE Mode, using 
RMS reading DMM/VOM (or A/P)

Residual Noise Floor

0.5 mVrms(max)

1

Volume @max, LFE Mode, w/ A/P 
Swept Bandpass Measurement 
(Line freq.+ harmonics)

Input Impedance

Line Input 

10K

ohms

n/a

Nominal

Filters

LP  4th order variable 

40-140 Hz

± 10

Subsonic filter (HPF) 3rd Orde

Fixed Hz

± 10

LFE Mode

Fixed Hz

± 10

LP Mode switch at LFE

Features

Line Level output

YES

functional 

RCA Line buffered line level output

Volume pot Taper (lin/log)

LOG

--

functional 

A Taper

Variable crossover 40-140 Hz

YES

functional 

4th Order LP Filter,  2nd order fix and 2nd order 
variable.

LP Selector switch  LFE-
Normal

YES

functional 

Pass through from the speaker input section

Phase switch

YES

--

functional 

Disables LP filter, intended for LFE 

Auto- On-Off  selector

YES

functional 

Switch located at the back panel

Input Configuration

Single Line input 

YES

--

functional 

Single RCA jack (BLK Color)

Line output configuration

Single Line level output

YES

Functional

Gain=0dB respect to line level input, 
Zo=600 Ohms 

Single RCA jack (BLK Color)

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, Line Input

2.5

mV

functional 

"

ATO Turn-on time

2

seconds

functional 

Amp connected and AC on, then 
input signal applied

Auto Mute/ Turn-OFF Time

15

minutes

17

(T) Time  before muting, after input 
signal is removed

Auto turn of time (T)   must be  10 > T < 17 Minutes

Power on Delay time

ATO mode

4

sec.

5

After applying the minimum ATO voltage (2mVRMS)

ON mode

2

sec.

2

After turning the stand-by knob to ON position

3

1500 

Array 

Subwoofer