Outer Limits 4x4 Board

hey guys, dunno if anyone can help me out here but ill ask anyway. I have a sierra with some average range jvc head unit and its just plugged into 2 front speakers (i.e no speakers in the back so the rear speaker wires are just taped up). My mate just gave me his old 300 W pioneer amp and his old 6 x 9s for my car. So yesterday i hooked it all up to see if it all worked in my car (it did in my best mates car last week before he took them out). BUT, for some reason when i turn the volume up about like 8 or somethin, the 6 x 9s cut out! i can then turn it right down, and theyll turn back on, but they just cut out as soon as i turn it back up. the amp had an excelent earth. Does anyone have any idea what it could be??? thanks all

luke

G'day Luke, it sounds like there may be a short in the 6 x 9 speaker wiring. Have you run the speaker wiring from the amp to the 6 x 9's without any joins in it? Is there a chance the speaker terminals may be touching metal? Maybe when screwing some of the plastic trim back on it has pinched the speaker wiring? Try disconnecting 1 speaker at a time & see if it still happens.

Cheers,
Matt.

no worries ill go have a look

in my car the same happens with my subs. i have a jvc head.

i have 2 1000w amps and when i turn them up it cuts out. i think it might be a low battery cut out or something.

are the gains on the amp set too high? try dropping them to nothing and make sure the bass etc on the head unit is set to 0 before you start.

Usually amps cut in and out for 2 main reasons.

Overheating / powering

or

Low battery

If when you turn the vol up the amp is getting to hot it will shut off to cool

or

it is not getting enough battery power to run at that duty. Maybe wiring is to small or you battery/alt are not up to the job but usually I would suggest the wire size first.

Mkae sure the polarity is correct on the speakers, positive with positive and neg with neg. Try disconecting one input RCA plug to see if only one side is at fault. Turn the gains down to start with. Make sure the ground wire to the amp is grounding properly, scratch off some paint where the terminal touches the body and use same size wire for ground as you do for the positive. Also make sure the ground from the battery to the body is sufficient, most factory ones are just good enough for the basics.

In all the headunit and amp install manuals i have looked at (i know, who reads those things anyway) it suggests also earthing the amp back to the headunit (doesnt have to be a big wire, similar size to the trigger wire for amp turn on) and is sometimes included in the amp wiring packs i have seen.

This probably wont solve your problem, but check all your wiring for a short, and make sure the gain isnt cranked to 100% which may be sending the amp into clip protection mode.

+dj_hansen+ wrote:In all the headunit and amp install manuals i have looked at (i know, who reads those things anyway) it suggests also earthing the amp back to the headunit (doesnt have to be a big wire, similar size to the trigger wire for amp turn on) and is sometimes included in the amp wiring packs i have seen.

This is abig no no. Your earth cable should be the same size as your power cable and should either be earthed back to the battery or on raw metal such as the body. Most people earth them the floor of the vehicle just make sure to sandpaper the paint so it is in contact with beare metal.

You have one of 2 problems;
1) your amp is going into protection because it can't keep up with the power draw (could be the gains on the amp or too small a wiring or badly wired or earthed badly)
2) you have a loose wire or voice call in the speakers and when you turn it up the bass is causing the speakers cone to move more hence the wire to the speaker or the speakers voice coils are shorting out on something.

Hope that helps.

tropey wrote:

+dj_hansen+ wrote:In all the headunit and amp install manuals i have looked at (i know, who reads those things anyway) it suggests also earthing the amp back to the headunit (doesnt have to be a big wire, similar size to the trigger wire for amp turn on) and is sometimes included in the amp wiring packs i have seen.

This is abig no no. Your earth cable should be the same size as your power cable and should either be earthed back to the battery or on raw metal such as the body. Most people earth them the floor of the vehicle just make sure to sandpaper the paint so it is in contact with beare metal.

You have one of 2 problems;
1) your amp is going into protection because it can't keep up with the power draw (could be the gains on the amp or too small a wiring or badly wired or earthed badly)
2) you have a loose wire or voice call in the speakers and when you turn it up the bass is causing the speakers cone to move more hence the wire to the speaker or the speakers voice coils are shorting out on something.

Hope that helps.

I meant in conjunction to the earth of equal size to the power cable back to chassis/battery. Sorry didnt explain further.

i agree with the guy that said the cone in the speaker could have a faulty connection, even the tweeter speakers could have faulty connections and this will couse the whole speakers to jump or play up when turned up. my suggestion is try another pair, if that fails just run them straight from the head unit, it will be loud enough.

if uv fixed the prob, what was it?