Question about Car Audio & Video
The crossover "Q", frequency, and boost knobs seem to not be working now. I faintly smelled something while I was driving and I can hear a difference. any idea what it may be
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Posted on Jan 02, 2017
SOURCE: JL 500/1 power problem.
There should be a small switch someware on the amp marked VOX or normal. I bet its on vox. if there is no switch then theres a jumper inside the unit to put it into a vox state. Vox Is when audio is at the input the amp goes on and when theres no voltage at the input the amp switches off.
Posted on Sep 22, 2006
SOURCE: jl audio 500-5
Assuming that you've confirmed that the speaker is in good working order and that the wiring isn't shorted in any way...
There are separate power supplies for the high and low amplifiers. It's possible that the one for the sub output has failed. If that's the case, the output transistors probably failed and that's what damaged the supply.
Generally, I'm willing to help people repair their amps but this is a large, complex amplifier and it should be repaired by a qualified technician.
Posted on Apr 19, 2008
Bass boost simply adds DB or gain to the bass signal. Some like it, some dont.
The frequency knob is the Low Pass Filter (LPF) that cuts off the amp output above
the set frequency. A bass system usually cuts off below 400 HZ and more often 200HZ.
A good, rattle your car bass note is in the 25-80HZ range or lower but most amps and audio
input devices cant attain a good low note with clarity.
"Low-pass filter allows only frequencies below the crossover point to be amplified. A high-pass filter allows only frequencies above the crossover point to be amplified - useful for keeping low bass away from small speakers, so they can play more efficiently."
Checkout Crutchfields Glossary of Car Amps.
Posted on Mar 15, 2011
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