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Loosing sound / distortion

My Legacy Series II amp, model LA 1020 has two problems. 1)The subwoofer is bridged and now won't play unless I play with the crossover switch. It will operate for a minute or so, then shut off. Ive checked connections, reversed channels to eliminate the head unit (JVC digifine) 2) The unbridged side is giving me some distortion intermittently in just the right channel. Again I have reversed the channels, etc. as above and the problem remains in the right channel. The speakers can handle well above the stated RMS and peak levels. I removed the cover plate and used contact cleaner to try on the switches suspecting possible oxidation. The only thing I have not done yet is try to use a home audio/video amp to make double sure it is not my head unit. Any ides or is my amp (or switches) just going?

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  • mcmusic1st Mar 17, 2008

    Thanks Dan. Your response confirms what I was suspecting.



    Thanks, Mike

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If the sub channel is shutting down, there is a problem with that channel. The unit will shutdown to prevent further damage. This unit will need to see a service bench to determine the defective part(s).
Dan

Posted on Mar 17, 2008

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I have 2 solo baric l7 duel 4ohm subs and a legacy la-2499 amp.What is the best way to wire it up?


Unfortunately, the amp is only 2 ohm stable, so the best option is to connect each subs voice coils in parallel (2 ohms) and connect the subs in series (4 ohms).

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CAN THE AMERICAN LEGACY SERIES 2 LA490 AMP HANDLE A 2 COILS 12'' KICKER SUBWOOFER??


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I need to know the size of external fuses for a american legacy amp 2000 watt 2 channel 1990


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1 Answer

Problem with legacy amp


I would check the RCA preamp wires connecting the stereo to the amp. If these are loose or broken, it could cause you to lose your sound.

Does the amp show signs of life, such as clicking on, an LED turns on, or anything like that?

Has anything else changed between the time it worked and didn't work?

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1 Answer

4ohm subwoofer and 2ohm amp


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1 Answer

Dual voice coil speakers


best way to do this to preserve your amp and speaker is to wire the speaker Voice coils in series.

VC1 = Voice coil 1

AMP + to VC1 +
VC1 - to VC2 +
VC2 - to Amp -

Set you amps bass gain down very low. Crank up the volume with a bass test audio track. Turn the switch to LPF or Low pass filter. Adjust a LPF to about 60 hz Adjust the bass gain up until your Sub begins to sound sitorted or choppy. Then tune the bass gain just below where it distorts. Then you are set.

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1 Answer

Optimum sound performance needed


1) legacy products are highly overrated and i have never seen one put out the power it claims
2) if you are running the amp bridged, you need to match the impedance of the speakers to the amps highest output impedance, otherwise your system will not sound all that great...

what size fuse or fuses does your amp use? what size wire did you install with (power and ground)? did you connect direct to battery or did you connect to a fuse block or similar? did you use a stiffening capacitor? does it sound like it is clipping when you turn it up or is it just distorted? what kind of box are you using for the speakers (ported, vented, sealed, bandpass)?

if you give me the model number of your speakers and your amplifier i can probably help you more, but with the information you have provided, this is all i can offer..

hope it helps,
trin

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1 Answer

Constant thumping


Theres most likly an open ground printed circuit trace on the Printed circuit board on the bottom. first clue is You said your girlfriend disconncted and blew the fuse. You gonna have to ytake the amp apart and totally disassemble the PCB off the rails and everything unless theres a bottom cover. It may be an obvious burn or could be hidding under the green paint of a trace?? Goos luck

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