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Amp cut i have an alpine head unit and changer being pumped by a infinity ra 6006, this in turn is driving two qb69s and a 1200w sony sub, the problem is it cuts out when i turn it up almost as if the cd is skipping. it returns to normal when i turn it down.its done this on two different head units. please help bledger ov crammy

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Re: amp cut

Use an ohm meter to check the impedance. impedance is resistance (ohm). and check wether you are having a voltage drop from your supply.

Posted on Jan 20, 2008

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Re: amp cut

Make sure that you have the right speaker load on your amp and also be sure that you are not starving your amp for current by having too small a wire for either the B+ or ground connections. Of course check all your connections to be sure they are in good shape.

Posted on Jan 18, 2008

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I have 2 amps instalkled in my car one is sony 1200w 2 channel amp for speakers and one is solid audio f2500d for 3 subs my sound and every thing was good but suddenly from yesterday im having trouble when...

First disconnect the CD head unit from the sub amp and see if the other amp works. If yes, the problem is the wires to the amp, the amp itself, or the subs/sub wiring. If no, the problem is the head unit--probably an internal short.
If the other amp works with the sub amp disconnected, reconnect the sub amp to the head unit, but disconnect the sub wires from the amp. Try the CD player. If the amp goes to protect with no speaker wires attached, the amp is bad. If the amp is OK, the problem is the subs or sub wires. Hook the wires up to the amp again, but disconnect them from the speakers. Try the player again. If the amp goes to protect, the problem is the amp wiring. If not, the problem is the subs. Check the impedance of each sub using an ohmmeter to determine which amp is out of spec.
Please let me know if you have questions, and thanks for using Fixya.

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1 Answer

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Make sure rca cables are tight at the amp and head unit, if you didn't put the sub in the box yourself or buy a retailer.. check the connections yourself. if it's an old amp it may be burnt up. some head units these days require you to turn the sub on (especialy alpine) really need more info on what you got and how old it is.

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Sony is not a bad brand if you use it correctly... This is what is happening my friend. You are what is called "clipping" your amplifier. What you need to do is make sure you are running your subs at the correct impedance or also known as resistance. Then make sure you are running them at the correct frequency, there is a turn tab on the amp to match the sub to the amp. Then never never turn the gain all the way up. This over works the amp and will wear it out much faster. This also does not actually give more power to the subs it just gains the power sooner then later. Never turn the gain more then half way up.. Hope this can step you in the correct direction my friend.

By the way plaztiksr4me kenwood is junk too :O

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Have you set the gains properly?

Are you sure the amplifier is receiving a strong signal from the head unit?

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is the remote lead properly connected to the head unit? if the power led is on then the power cable and earth must be good, check the remote lead 2 your head unit first, if thats all good try looking at the amp to see whether theres a small switch to adjust the output going to the subs, if its very low or right off then nothing will be going through to the subs. if its on high and fine it only realy leaves the neg and pos inputs from the amp 2 the subs.

cheers, adam

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