Question about Legacy Audio LA770 Car Audio Amplifier

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My legacy red series 2 la770

I have a legacy amp for my subs in my car. it is a la770 500w x 2ch. it just started randomly and what it does is when i turn it on, the protect light comes on VERY dimly and it puts out a very loud rumble constantly till i turn it off? what is the problem and how do i fix it????

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Re: my legacy red series 2 la770

You probibly have a bad RCA cable that happend to my on my brand new MTX thunder amp, try that or else move your ground to a dif. spot in the car or add another ground, also make shur your RCA cables are on the opp side of the power because they magnetic power ran through the power cables can distort and some time dammape your subs.

Posted on Sep 04, 2008

Re: my legacy red series 2 la770 - Legacy Audio LA770 Car Audio Amplifier Car Amplifiers

Buy a new amp!

Posted on Sep 06, 2007

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1 Answer

Protect light is on ,no sound?

Make sure you have a good ground connection. The ground wire should be solidly connected to the vehicle chassis in a paint-free location. If the ground is connected badly, the protect light will come on.

Mar 08, 2011 | Legacy Audio Legacy - Red Series: 2...

1 Answer

I have a boss rt645 2ch 1400 watt amp would this amp properly push a pair of 12 inch mtx terminators.

That all depends on the wattage of the subs. also the independance of the subs. If your amp is 1400 watt, maximum you want is 2 600watt subs. if your subs are higher you will blow your amp eventually as your amp isnt powerful enough to pump out to that level.You should never have your amp fully turned up to max, 80% is perfect and will not make your amp blow. Hense why you want your subs less than the max output of your amp.

Mar 04, 2011 | Boss AUDIO RT-645 2-Channel Riot Series...

1 Answer

Legacy LA770 worked for 2 10" subs but not for 1 12" sub

if the protect light is still on with all speakers disconected then you have overloaded the internal ic and blown it beyound its ability to reset


Jun 25, 2010 | Legacy Audio LA770 Car Audio Amplifier

1 Answer

How much does this amp run

Well here is the stats

2000watts 2-channel
Output Powers
• 500W (RMS) x 2CH (2 Ohm) 500rms each channel
• 600 (RMS) x 2CH (4 Ohm) 300rms each channel
• 1000W (RMS) x 1CH (4 Ohm)

If your talking about price it runs about...


Jan 12, 2010 | Solid Audio Formula Series F2000 2-Channel...

2 Answers

Hooking up DVC subs

The amp is rated to run a 2 ohm load on each channel. To do this, connect the voice coils of one sub in parallel (tie both "+" on the sub to each other and both "-" on the sub to each other), then connect that sub to one channel of the amp. Repeat this process for the other sub and connect it to the other channel on the amp. The subs will be in stereo and the amp will be outputting it's maximum power.

Mar 09, 2008 | Legacy 2CH 1000W AMP Car Audio Amplifier

1 Answer


never attemp to bridge your amps specially this type of amps. this are too very complicated. you may blow your amp if you will attempt it again.

Jan 22, 2008 | Legacy BLUE 4 X 250W CAR AMP Car Audio...

1 Answer


u use the first live out put and the last out put wich should b a negative whick will make the amp run all its power into the sub

Jan 21, 2008 | Legacy Audio LA770 Car Audio Amplifier

1 Answer

Half my amp works

Im sorry to tell you, that if only one side is working, you most likly have an open driver transistor or input device. If the one side had a shorted output then the whole unit would go into shutdown. The fact that the unit still works is a good sign. The correct way to test an amp is with some equipment most folks do not have, and that means a trip to your local good audio repair facility. They will need to doi a bench check on the amp with load resistors and a tone generator. If the amp preforms good on the bench, then you should start looking for bad speakers and or pinched wiring,loose connections or bad speakers. Let us know what happens? Good Luck

Oct 05, 2006 | Legacy Audio Legacy - Red Series: 2...

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