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 |  JL Audio - MHD900/5 Owner’s Manual  

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serViCing Your Jl audio amPliFier

If your amplifier fails or malfunctions, please 

return it to your authorized JL Audio dealer so 
that it may be sent in to JL Audio for service. 
There are no user serviceable parts or fuses inside 
the amplifier. The unique nature of the circuitry 
in the JL Audio amplifiers requires specifically 
trained service personnel. Do not attempt 
to service the amplifier yourself or through 
unauthorized repair facilities. This will not only 
void the warranty, but may result in the creation 
of more problems within the amplifier. 

 

If you have any questions about the installation or 

setup of the amplifier not covered in this manual, 

please contact your dealer or technical support. 

 

Jl audio technical support

:  

(954) 443-1100  

9:00 AM – 5:30 PM (Eastern Time Zone)

 

Monday - Friday

aPPendix a:
mHd900/5 specifications

Amplifier Topology:  

Class D, switching type with 

patented Single-Cycle Control™ technology.

Power Supply: 

Pulse width modulation-regulated 

switching power supply

Recommended Fuse Value / Type:

  60A (AFS, AGU or 

MaxiFuse™)

Rated Power (Main Channels / Stereo):  

100W RMS x 4 @ 4Ω (11V - 14.5V)
75W RMS x 4 @ 1.5-3Ω (11V - 14.5V)

Rated Power (Main Channels / Bridged):  

200W RMS x 2 @ 8Ω (11V - 14.5V)
150W RMS x 2 @ 3-6Ω (11V - 14.5V)

Rated Power (Subwoofer Channel):  

500W RMS x 1 @ 1.5-4Ω (11V - 14.5V) 

THD at Rated Power:

 

Main Channels: <0.03% @ 4Ω per channel 
Subwoofer Channel: <0.05% @ 4Ω 
(Average at 1 kHz)

Signal to Noise Ratio (20 kHz Bandwidth):

  

Referred to Rated Power: 108 dBA
Referred to 1 Watt: 88 dBA

Frequency Response (Main Channels):

  

12 Hz - 28 kHz (+0, -1dB)

Frequency Response (Subwoofer Channel):

  

12 Hz - 10 kHz (+0, -1dB)

Damping Factor (Main Channels):

 

>400 @ 4Ω per ch. / 50 Hz
>200 @ 2Ω per ch. / 50 Hz

Damping Factor (Subwoofer Channel):

 

>800 @ 4Ω  / 50 Hz
>400 @ 2Ω  / 50 Hz

Crossover Filters:

High-Pass Filters: 

Front Channels and Rear Channels

Low-Pass Filter: 

Subwoofer Channel

Filter Type (all channels):

 12 dB/octave Butterworth or  

24 dB/octave Linkwitz-Riley

Cutoff Freq. Range:

 Continuously variable, 50 - 500 Hz

input sections:

No. of Inputs: 

 Three Stereo Pairs (Front, Rear and Sub)

Input Type:  

Differential-balanced with RCA jack inputs

Input Range:  

Switchable from 200mV - 2V RMS (Low) 

to 800mV - 8V RMS (High)

Chassis dimensions (lxwxH): 

10.74 in. x 7.85 in. x 1.93 in. (273 mm x 199.5 mm x 49 mm)
Dimensions do not include connectors.

Due to ongoing product development, all specifications are subject to 
change without notice.

Summary of Contents for MHD900/5

Page 1: ...ed dealer has the training expertise and installation equipment to ensure optimum performance from this product Should you decide to install the amplifier yourself please take the time to read this ma...

Page 2: ...ertified or approved for use in aircraft Do not attempt to bridge the outputs of this amplifier with the outputs of a second amplifier including an identical one Planning Your Installation It is impor...

Page 3: ...make sure that they are set according to the needs of the system 12 Install power wire fuse 60A for a single MHD900 5 and reconnect the negative battery post terminal 13 Turn on the source unit at a...

Page 4: ...ropriately for safety Any positive power wires run through metal barriers must be protected with a high quality insulating grommet to prevent damage to the insulation of the wire Failure to do so may...

Page 5: ...channels This means that the Input Sens rotary controls will operate within that voltage window If you are using an aftermarket source unit with preamp level outputs this is most likely the position t...

Page 6: ...of the amplifier decreases for a given input voltage when the Input Range switch is placed in the High position The output increases with the switch in the Low position While this may sound counter i...

Page 7: ...high frequency HF speakers and are separately filtered to send appropriate frequency ranges to each speaker system The most common application of bi amplification in mobile audio is to drive a subwoo...

Page 8: ...f this is happening in your system have your charging system inspected to make sure it is working properly If no problem is found with the supply voltage to the amplifier and you are still seeing alte...

Page 9: ...Power Main Channels Stereo 100W RMS x 4 4 11V 14 5V 75W RMS x 4 1 5 3 11V 14 5V Rated Power Main Channels Bridged 200W RMS x 2 8 11V 14 5V 150W RMS x 2 3 6 11V 14 5V Rated Power Subwoofer Channel 500W...

Page 10: ...6 20 0 V 32 0 V 44 7 V 4 20 0 V 24 6 V 44 7 V 3 16 0 V 21 2 V 38 7 V 2 12 3 V not recommended 31 6 V 1 5 10 6 V not recommended 27 4 V Appendix B Precise Frequency Selection Chart Filter FREQ Detent P...

Page 11: ...r Connector Plugs The speaker wire connectors are designed to accept up to 12 AWG wire Make sure to strip the wire to allow for a sufficient connection with the metal inside each terminal How do I pro...

Page 12: ...22 JL Audio MHD900 5 Owner s Manual 23 INSTALLATION NOTES Use this diagram to document your amplifier s switch and control positions...

Page 13: ...s on implied warranties therefore these exclusions may not apply to you This warranty gives you specific legal rights and you may also have other rights which vary from state to state If you need serv...

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