20 Most Recent Legacy Audio LA770 Car Audio Amplifier Questions & Answers


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

sorry

Legacy Audio... | Answered on Jun 25, 2010


stop turning it on, until you change the transistors. you will burn the entire system.

change all the transistor, not only the smoking ones.
check all other components.

Legacy Audio... | Answered on Jun 02, 2010


LETS SEE IF YOU HAVE A PROBLEM WITH THE AMPLIFIER ITSELF OR IF SOMETHING IN THE INSTALL REMOVE THE RCA INPUTS AND DISCONNECT THE SPEAKERS, THEN POWER THE AMPLIFIER UP WITH THIS NO INPUT, NO SPEAKER LOAD CONDITION. IF IT STILL GOES INTO PROTECTION OR FAILS TO POWER UP AND YOU HAVE VERIFIED THAT THE POSITIVE AND ESPECIALLY THE GROUND CONNECTIONS, ALONG WITH THE REMOTE CONNECTIONS ARE 100%, THEN THE AMPLIFIER WILL NEED TO BE SERVICED. SOMETIMES THE RADIO CAN HAVE A DEFECTIVE SAGGING BELOW 11 VOLTS REMOTE OUTPUT WHICH WILL CAUSE THE AMPLIFIER TO NOT POWER UP. IF YOU DISCONNECT THE RADIOS REMOTE LEAD AT THE AMPLIFIER AND TEMPORARILY INSTALL A JUMPER FROM THE POSITIVE POWER TERMINAL AND THE REMOTE TERMINAL OF THE AMPLIFIER, THIS WILL NORMALLY FORCE THE AMPLIFIER ON. AT THIS POINT,YOU HAVE TOTALLY BENCHED THE AMPLIFIER AS IT WILL NOT HAVE ANYTHING TO DO WITH THE ACTUAL INSTALLATION AND IF STILL FAULTY IT SIMPLY WILL HAVE TO BE SERVICED. LET ME KNOW IF YOU NEED FURTHER ASSISTANCE.....V

Legacy Audio... | Answered on Jan 06, 2010


do u have an crossover

Legacy Audio... | Answered on Feb 05, 2009


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

Legacy Audio... | Answered on Feb 01, 2009


buy a new amp!

Legacy Audio... | Answered on Sep 04, 2008


If the amp is bridgeable then u should see lettering where the speaker outputs or the channels are and you will a symbol saying bridged and then u can see a + and - symbol with lines going to the other channels. In other words they call it bridged because you are jumping from one speaker output to the other, usually bridging an amp consists of Left - to Right + or vice versa.

Legacy Audio... | Answered on Jan 28, 2008


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

Legacy Audio... | Answered on Oct 06, 2006


First thing to look for would be pinched speaker wires,or a bad ground, or a loose b+ wire. The next would be to have the amp bench tested and the tech should bang and tap on the unit to see if there are bad or cold solder connections inside on the printed circuit board assy.

Legacy Audio... | Answered on Sep 09, 2006


Hi,

Would need some more info my friend, as when was the last time that it worked.. & what changes have we made on it since it was bought ... post the same to me & in the mean while try these ...

1.) Look for an option DVD menu to turn this safety feature off for ... Go to Setup menu and perform Position

2.) Try checking the connection from your car battery to the audio device...

By the way how old is the player ..

Thanks !!




Legacy Audio Car... | Answered on Mar 28, 2009


There are lots of suggestions, specs and plans for loudspeaker enclosures available online with accompanying formulas for calculating sizes of boxes, ports, etc., but successful results tend to be achieved by experience as much as following plans and tuned port reflex enclosures are akin to the black arts - hifi purists would change the port size after a "bedding in" time for the enclosure and drive unit.

Your subs are rated at 300 rms so clearly you are overloading them at 350/400 and you should be aiming to max them at around 250 in a reflex cabinet. If you really must drive them so hard you really need to consider an infinite baffle as an alternative enclosure.

Car Audio &... | Answered 2 days ago


ASK GOOGLE OR THE MFG WE DO NOT HAVE IT HERE

Car Audio &... | Answered on Jan 12, 2020


take help from online websites that have this service like helping in repair some like reliable-store have instant help.. others are a bit slow which I don't prefer... rest is up to u.. U can also get free manuals

Car Audio &... | Answered on Jan 11, 2020

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amp goes in protect whne bridged cuts

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