Question about Legacy Audio LA770 Car Audio Amplifier

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Legacy amp 1200 watts

I have 2 amps conected and some times when a heavy bass line drops it puts 1 of my amps into protect mode while the other amp is ok and still running my speakers can any 1 help me solve this problem?

Posted by taff hussain on

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Anonymous

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I have had the exact same problem with the exact same lagacy amp that you have posted, put your ground in a different spot or try double grounds in two different spots this should solve your problem here. good luck

Posted on Oct 06, 2006

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Xtc 7500w amp


The amp might be on protection mode when both subs are driven...sign of an overloading problem. Does it work fine at lower volume levels? Check also the amp's supply voltage if it fluctuates out of tolerance level...might also be a loose connection in the wiring or terminals in the supply rails.

Jan 05, 2014 | Motorcycles

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So i have installed my amp, epicenter, all wiring is done, hace great ground.. But once i turn my car on to sound check everything starts fine but after turning up the volume a bit.. My amo goes into...


It sounds like you have your gain to high. best way to solve this is by turning the gain way down to - or lowest number , then turn everything on and upto the volume you desire, then slowly up the gain. also avoid using bass boost, I agree it sounds great but it puts strain on the amp and shortens life in the amp. with the bass boost off, you can adjust others (not the gain) to get bass.

Hope this helps

Jan 26, 2013 | Car Audio & Video

1 Answer

My brand new Kappa One amp is powering 2 brand new Kappa 100.9w subs at a 2 ohm load. The Ground an Power are both 4 gauge wire. The problem is my amp is just getting so hot that I can only touch it for a...


Sometimes these amps have been known to get hot very easily. That said, I would first confirm the resistance on your speakers at rest is 4 ohms each, so that your amp is seeing a 2 ohm load. Be sure that the smart switch on each sub is flipped to the 4 ohm mode, and measure each separately.
Be sure that you've properly set the filters, gain, and bass boost so that your amp is not being over driven. Your HP filter should be set no lower than 20Hz--most music is never going to go that low so there is no point. A narrower frequency band is always going to be healthier for your subwoofer. The LP filter should be set no higher than 90 to 100 Hz at the most, depending on how much midbass your speakers can handle, so that you don't have too much of a sonic gap between the subs and mids. As for the gain, a good place to start is with your radio set at it's highest comfortable, distortion free setting, minus 25%, then start with the amp's bass boost all the way down, and the gain set to the minimum level at which you can just begin to hear music. Choose a bass heavy track if you ever listen to bass heavy music, so we can prepare for the most stress that the amp will experience. Slowly turn up the gain until you start to hear distortion during heavy bass hits, and back off 20% - 25%. This should be the highest volume you ever push your amp to, and from here, you can ever so slightly turn up the bass boost if you absolutely must, but not to the point of any distortion, if you hear any, back it off a bit.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/reginald_bec291de192ca44f

Jun 22, 2017 | Infinity kappa one Car Amp

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I cant get my jl audio w6 10s to give off much bass with the jl audio 500/1 amp


here is a manual for your subwoofers: http://mobile.jlaudio.com/pdfs/8-12W6_BDS.pdf

use the wiring diagram for 1.5? (1.5ohm) with 2 speakers. the diagram for 3 speakers will not work, because it would bring the load down to 1 ohm, and the amp cannot go below 1.5 ohm.

to set up the amp:

under "preamp output section", on the "output mode" switch, select "amp filter"

to set up the levels: start with the amp gain pretty far down- with the input voltage on low for line level outputs from the deck, and on high for speaker outputs from the deck. now turn your cd deck as far up as it will go until it distorts, then turn the cd deck down to just where it stops distorting. now, you can start to turn up the gain on the amp.

on the filters, youll prolly want the cutoff filter around 100hz @ 24db slope. start with the infrasonic filters off, but, if you do get into them, try centering between 30 and 60hz on either, and, possibly dropping the cutoff filter to 80hz.

Jan 31, 2011 | Jl Audio 500/1 Car Audio Amplifier

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My kicker solo baric is moving to the bass but is not putting out any sound. I've swapped the subs to see if it was the sub but it wasn't. I believe it is the amp but im not sure. The amp is in protection...


YOU HAVE A SHORT CIRCUIT WITH THE RCA CABLES THAT ARE GOING THO THE SUB WOOFER AMP CHANGE THE RCA CABLES FOR A NEW ONES!! AND IF YOU CAN BUT IT HEAVY DUTY

Feb 10, 2010 | Kicker Car Audio & Video

1 Answer

My infinity reference 7540a amp cuts in and out with heavy bass when the ''loud'' feature is on. I redid my ground, remote wire, shortened my power cable, and double checked all speaker connections. I dont...


sounds like ur gains are set to high and is going into protect mode

also what ive seen happen before is the speakers (if mounted in metal shelf or door and arnt bolted down correctly can flex under bass notes and flex the speaker that much the termanls short onto the metal and amp hits protect mode
(rare but worth a look if you think u have elimanted most other things Had a dude come to me when i was working in sydney with this problem )

also could be things like clipping protection , overheat protection ,amp drawing to much current from the alternator

do your lights dim when you hit the bass notes ?

get back to me and im sure we could solve this problem

Jan 22, 2010 | Infinity Reference 7541a Car Audio...

1 Answer

Kenwood amp kac-x401m


How long will the bass play before the amp kicks into protection mode and how loud are you listening to it? I've noticed with my amps that if they don't have enough air flow they will get hot and kick into protection mode. They will also kick into protection mode if you are running it at more than it can handle. Check your adjustments on both your amp and the head unit. Make sure you are not running more bass than the amp can handle.

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Crunch GP 3000 D Pro


It's very likely that the output transistors have failed in the amp. They will need to be replaced.

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Does it shut off for a couple of minutes or a couple of seconds? Is the amp hot when it shuts off? Are you sure you have the speakers wired to an acceptable ohm load for the amp? Have you measured the voltage at the amp (across the B+ and ground terminals) to make sure it's not dropping too low on hard bass notes?

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