JBL Northridge E250P - User Manual

JBL Northridge E250P

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Northridge

™

E-Series

E250P

Powered Subwoofer

Service Manual

JBL Consumer Products

250 Crossways Park Dr.

Woodbury, New York 11797 Rev2 2/2004

Table of Contents

Other manuals for JBL Northridge E250P

Preliminary Service Manual23 pages

Questions and Answers

G
Gregory RussellAug 1, 2025
What to do if there is no sound from my JBL Subwoofer when using line-level inputs?
- S
  Samuel SmithAug 1, 2025
  If there is no sound from your JBL Subwoofer when using the line-level inputs, check that the receiver/amplifier is on and a source is playing. Also, ensure that the powered subwoofer is plugged into an active electrical outlet and is switched on. Check all wires and connections between the receiver/amplifier and the subwoofer. Review the proper operation of your receiver/amplifier. Slowly turn the Level Control clockwise until you begin to hear the desired amount of bass. Finally, make sure that you have configured your receiver/processor so that the subwoofer/LFE output is on.
P
petersenkaylaAug 9, 2025
What to do if there is no sound from any speakers when using high-level inputs on my JBL Subwoofer?
- S
  Stacie ColeAug 9, 2025
  If you're not getting any sound from your speakers when using the high-level inputs on your JBL Subwoofer, check that the receiver/amplifier is on and a source is playing. Also, make sure the powered subwoofer is plugged into an active electrical outlet and is switched on. Check all wires and connections between the receiver/amplifier and the speakers. Review proper operation of your receiver/amplifier.
R
Rebekah AdamsAug 20, 2025
What to do if my JBL Northridge E250P Subwoofer has low bass output?
- N
  Nicholas SpencerAug 20, 2025
  If your JBL Subwoofer has low or no bass output, ensure that the connections to the left and right 'Speaker Inputs' have the correct polarity (+ and –). Also, make sure that the subwoofer is plugged into an active electrical outlet and switched on. You may also need to adjust the crossover point, flip the Phase Control switch to the opposite position, or slowly turn the Level Control clockwise until you begin to hear the desired amount of bass. If you are using a Dolby Digital/DTS receiver or processor, ensure that the subwoofer adjustments on the receiver/processor are set up correctly.

Summary

Safety Information

Leakage Resistance Check

Procedures for testing leakage current and resistance before returning the unit for service.

Critical Components

Identifies critical components requiring specific replacement parts for safety and proper function.

Operation

Troubleshooting

Test Set-up and Procedure

General Function

Schematics

Tech Tips

Replacing MOSFETS Q18 Q22

Detailed Troubleshooting

Power Amp Section

Detailed diagnostic procedures and checks for the power amplifier section.

Pre Amp Section

Flow Chart

Summary

Safety Information

Leakage Resistance Check

Procedures for testing leakage current and resistance before returning the unit for service.

Critical Components

Identifies critical components requiring specific replacement parts for safety and proper function.

Operation

Troubleshooting

Test Set-up and Procedure

General Function

Schematics

Tech Tips

Replacing MOSFETS Q18 Q22

Detailed Troubleshooting

Power Amp Section

Detailed diagnostic procedures and checks for the power amplifier section.

Pre Amp Section

Flow Chart

JBL Northridge E250P Specifications

General

Power Output	250 Watts
Frequency Response	25Hz – 150Hz
Type	Powered Subwoofer
Amplifier Power (RMS)	250 Watts
Peak Power Handling	500 Watts
Low-Frequency Transducer	12" PolyPlas
Crossover Frequency	50Hz - 150Hz
Enclosure Type	Bass Reflex
Inputs	Line-level
Driver Size	12 inches

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