JBL 10 inch Powered Subwoofer E150P - E250P and PB10 - PB12 Northridge E-Series
Circuit diagram
Amplifier Power (RMS): 150 Watts
Peak Dynamic Power *: 250 Watts
Driver: 10" (254mm) PolyPlas
Peak Dynamic Power *: 250 Watts
Driver: 10" (254mm) PolyPlas
Dimensions (H x W x D): 17-3/4" x 12-1/4" x 14-1/2"
(451mm x 311mm x 368mm)
Weight: 33.5 lb/15.2kg.
Weight: 33.5 lb/15.2kg.
Circuit diagram and PWB
For models: E150P - E250P and PB10 - PB12
Replacing MOSFETS Q18, Q22
> In the event you need to replace MOSFET transistors Q18 or Q22 as part of a repair, it is important to use ONLY the JBL part FE106401110 or only the brands: International Rectifier, or Fairchild.
> Replace both Q18 and Q22 MOSFET’s in the circuit, even if only one seems to be damaged.
> Do NOT mix & match these components from different manufacturers, or batches. They should be identical.
> In the event you need to replace MOSFET transistors Q18 or Q22 as part of a repair, it is important to use ONLY the JBL part FE106401110 or only the brands: International Rectifier, or Fairchild.
> Replace both Q18 and Q22 MOSFET’s in the circuit, even if only one seems to be damaged.
> Do NOT mix & match these components from different manufacturers, or batches. They should be identical.
Unit Under Test
1) Connect one line level input cable (RCA) from signal generator to either Right or Left Level input on UUT. LEVEL control should be full counterclockwise (MIN). Make sure the LFE/Normal switch is in the NORMAL position.
2) Turn on generator, adjust to 100mV, 50Hz.
3) Plug in UUT; Turn Main Power switch ON. LED’s on the top panel may be either Red or Green. Turn LEVEL control full clockwise (MAX). Low Pass control should be set fully clockwise (150Hz).
4) LED should turn Green; immediately bass response should be heard and felt from port tube opening.
5) Turn off generator, turn LEVEL control fully counterclockwise (MIN), disconnect RCA cables.
6) Connect one pair of speaker cables to either high level input terminal on UUT. Cables should be connected to an integrated amplifier fed by the signal generator.
7) Turn on generator and adjust so that speaker level output is 1.0V, 50Hz. Turn LEVEL control full clockwise (MAX).
8) Green LED should light, immediate bass response should be heard and felt from the port tube opening.
1) Connect one line level input cable (RCA) from signal generator to either Right or Left Level input on UUT. LEVEL control should be full counterclockwise (MIN). Make sure the LFE/Normal switch is in the NORMAL position.
2) Turn on generator, adjust to 100mV, 50Hz.
3) Plug in UUT; Turn Main Power switch ON. LED’s on the top panel may be either Red or Green. Turn LEVEL control full clockwise (MAX). Low Pass control should be set fully clockwise (150Hz).
4) LED should turn Green; immediately bass response should be heard and felt from port tube opening.
5) Turn off generator, turn LEVEL control fully counterclockwise (MIN), disconnect RCA cables.
6) Connect one pair of speaker cables to either high level input terminal on UUT. Cables should be connected to an integrated amplifier fed by the signal generator.
7) Turn on generator and adjust so that speaker level output is 1.0V, 50Hz. Turn LEVEL control full clockwise (MAX).
8) Green LED should light, immediate bass response should be heard and felt from the port tube opening.
Sweep Function
1. Follow steps 1-4 above, using a sweep generator as a
signal source.
2) Sweep generator from 20Hz to 300Hz. Listen to the cabinet and drivers for any rattles, clicks, buzzes or any other noises. If any unusual noises are heard, remove driver and test.
2) Sweep generator from 20Hz to 300Hz. Listen to the cabinet and drivers for any rattles, clicks, buzzes or any other noises. If any unusual noises are heard, remove driver and test.
Driver Function
1) Remove driver from cabinet; detach + and - wire clips.
2) Check DC resistance of driver; it should be 5.8 ohms.
3) Connect a pair of speaker cables to driver terminals. Cables should be connected to an integrated amplifier fed by a signal generator and adjust so that speaker level output is 5.0V.
4) Sweep generator from 20Hz to 1kHz. Listen to driver for any rubbing, buzzing, or other unusual noises.
2) Check DC resistance of driver; it should be 5.8 ohms.
3) Connect a pair of speaker cables to driver terminals. Cables should be connected to an integrated amplifier fed by a signal generator and adjust so that speaker level output is 5.0V.
4) Sweep generator from 20Hz to 1kHz. Listen to driver for any rubbing, buzzing, or other unusual noises.
Phase
The Phase Control determines whether the sub-woofer's piston-like action moves in and out in phase with the main speakers or opposite the main speakers. There is no correct or incorrect setting. Proper phase adjustment depends on several variables such as sub-woofer placement and listener position. Adjust the phase switch to maximize bass output at the listening position. Remember, every system, room and listener is different. There is no right or wrong settings; this switch offers the added flexibility to adjust your sub-woofer for optimum performance for your specific listening conditions without having to move your speakers. If at some time in the future you happen to rearrange your listening room and move your speakers, you should experiment with the phase switch in both positions, and leave it in the position that maximizes bass performance.
Crossover Adjustments
The Crossover Frequency Control determines the highest
frequency at which the sub-woofer reproduces sounds. If your main speakers can
comfortably reproduce some low frequency sounds, set this control to a lower
frequency setting, between 50Hz and 100Hz. This will concentrate the sub-woofer's efforts on the ultra deep bass sounds required by today’s films and music. If you are using smaller bookshelf speakers that do not extend to the
lower bass frequencies, set the low-pass crossover control to a higher setting,
between 120Hz and 150Hz. This control is not used when the LFE switch is in the
“LFE” position.
