JBL 1500 Array schematic - 1000Watts Subwoofer - 230 Volt

Output 1000W
Low-Frequency Transducer W1500H 15" Pulp-cone driver
Frequency Response (-3dB) 25Hz – 400Hz, variable
Crossover Frequencies 40Hz-140Hz HP
Port 4" Flared
Dimensions (H x W x D) 23" x 19-1/2" x 19" (584mm x 495mm x 483mm)
21" (533mm) Deep with grille
Weight 125 lb (57kg)

If you have a Dolby Digital or DTS receiver/processor with a low-frequency effects (LFE) output, set LFE/LP switch to LFE. If you prefer to use the crossover built into the 1500 Array, set the LFE/LP Switch  to LP.

Exploded view [Click on the pictures to magnify]

Circuit diagram

Test procedure

General Unit Function (UUT = Unit Under Test)

Switch/Controls:

GAIN control full Counterclockwise (Min)

CROSSOVER (Hz) Full Clockwise (140)

PHASE switch - either position

LFE/LP – LP position

1) From the signal generator, connect one line level (RCA) cable to the Line In jack on the UUT.

2) Turn on generator; adjust to 200mV, 50 Hz.

3) Plug AC power cord in UUT, turn power switch ON.

4) LED should be ON (faceplate). Turn up LEVEL control to full Clockwise (Max).

5) LED should be Green; Bass response should be heard and felt vigorously from woofer and port tube.

6) Turn LEVEL control full Counterclockwise (Min). Turn power switch OFF.

Sweep Function

1) Follow steps 1-5 above, using a sweep generator as a signal source – adjust the generator to 75mV, 50 Hz.

2) Sweep generator from 20Hz to 300Hz. Listen for any rattles, clicks, buzzes or any other noises. 

If any unusual noises are heard, test woofer according to the instructions below.

Driver Function

1) Remove woofer from the enclosure.

2) Check DC resistance of woofer; it should be 5.9 Ω ±10%,

3) Connect a pair of speaker cables to woofer terminals. Cables should be connected to an integrated amplifier fed by a signal generator. Turn on generator and adjust so that speaker level output is 6.0V.

4) Sweep generator from 20Hz to 1kHz. 

Listen to driver for any rubbing, buzzing, or other unusual noises.