Question about Car Amplifiers

1 Answer

Mac-505 amp my amp seems to run , all the gauges light up but no power goes to my subs, on the back there are 2 lites that light up- one red and says protect and another that says power and is green. the protect light is on but the power light is not. help me please, hud

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 631 Answers
Re: mac-505 amp

Disconnect all speaker wires and signal cables from the amp. If it powers up normally (no protect light), the wiring needs to be checked. If it still goes into protect, the amp likely has blown output transistors.

Posted on Dec 21, 2007

Add Your Answer

0 characters

Uploading: 0%


Complete. Click "Add" to insert your video. Add


3 Points

Related Questions:

2 Answers

Everything did work but kept blowin fuses by the battery. Now a red light stays on, on the amp & the blue/green power lights dont *** on. What should i do?

Check all of your power connections, your speaker connections and battery connections. if all are good and clean (no shorts/wires touching) then try unhooking your speakers and see if the lights come back, if that helps then you have problems with your speakers, if not then amp is bad. I hope this helps ya.


Feb 17, 2011 | Phoenix Gold Titanium 800.1 Car Audio...

2 Answers

2 12" subs + 600W amp. Turn on, goes boom once, then red light

Is your gain all the way up? If it done this before, sounds like your over working the amp. Make sure your subs ohm load is capable with the amp load to. If they are 1 ohm and your amp is only 2 ohm stable, it would beat for a lil bit then go into protection mode to. Check your wires too.

May 13, 2010 | Insignia 600W Bridgeable Amplifier with...

1 Answer

Amp is not operating at full potential also red portectant lite comes on kenwood kac-8104d

make sure all your wires you are using to connect the amp are 4 gauge check your ground make sure its drilled threw thick metal scuff off the paint that its grounded too and check how you have your subs wired see what ohm there wired in the you can get more power out the amp in 2 ohm then 4 ohm

Mar 31, 2010 | Kenwood KAC-8104D Car Audio Amplifier

1 Answer

KAC9103d been running great for a year, factory refurb. for a month been losing sub output. checked all connections again, everything good. Turned on went driving 15 minutes later lost bass ckd again red...

Could be that you have a partially roasted(blown) coil on one of your subs which will function- but will keep tripping your amp.You can check that out just by using a different set of subs to listen to and by the process of elimination if the problem goes away then you know where the problem is at.Also check your gains you might be riding the gain a little high which causes distortion which causes heat(FAST) which will cause the amp to shut down completely or some amps will decrease output in a programmed attempt to save itself.turn the bass boost down to half if you even use it at all- that too can cause massive distortion in the amp itself,meaning only that if you have the bass boost on your deck turned up and then you turn the boost up on your amp the sound signal is then WAYYY distorted which will cause a thermal shutdown too. Last thing is to make sure that your subs arent running below 2 ohms because i believe that particular amp is designed to put out about 900 watts at 2 ohms.good luck

Jan 22, 2010 | Kenwood KAC-9103D Car Audio Amplifier

3 Answers

Red thermal light on

well id say you have cooked your amp and or subs they can only take beatings for so long. show it no mercy it gives it back,does amp smell do subs smell borrow amp see if subs are ok if so it will be your one .keep the gain down??

Jun 11, 2009 | Rockford Fosgate Punch P550.2 2-Channel...

1 Answer

RED Port light on AMP?

are you sure its not PROT?
the amplifier is protecting itself from fire because of something.
Disconnect the subs. and turn on.
if it comes on normally, the subs are at fault and will need attention. If the light still stays on, you hafe probably blown an output on the amplifier and it will need repair.

Dec 24, 2008 | Sony XM-2200GTX Car Audio Amplifier

2 Answers

Bass sounds flat when volume is increased

probably your power is too short, increase your gauge wire, and your ground wire of the amplifier has to be shortly as possible, and the positive has to be enough to support peak power, you can also put a big capacitor on the positive wire to give some more power while the bass peak.

Apr 26, 2008 | Earthquake Sound PH-D2 Car Audio Amplifier

2 Answers

Kenwood kac 859 amp

hi, note that if you are not using the proper gauge b+ and gnd cable with this amp then the current available at the amp wont be sufficint to keep amp on. also try using this amp while vehicle is idling. if this doesnt work then disconnect all spks from amp and check if red lite stops flashing. if it doesnt stop flashing then amp has internal fault. if lite stays on brite then proceed to check each spk load impedance, then reconnect each spk individually. the minute red lite starts flashing it will give you a clue that the channel or spk load is faulty. cheers

Jul 27, 2007 | Kenwood KAC-859 Car Audio Amplifier

1 Answer

Driving in first gear

Your Amp is in protect. Disconnect your subs and turn it back on. IF the led goes back to green the you have a blown Sub and it will need to be replaced. If the amp stays in protect even with the subs removed the the amp is toast.

May 29, 2007 | MA Audio HK2000D Car Audio Amplifier

2 Answers

Took out my amp and sub put it back in and now it wont work

you masht seting all parameter too the midel befour selected oan by oan,step by step equalayzer

Mar 30, 2007 | Sony Xplod XM-1652Z Car Audio Amplifier

Not finding what you are looking for?
Car Amplifiers Logo

Related Topics:

388 people viewed this question

Ask a Question

Usually answered in minutes!

Top Car Amplifiers Experts

Tygh Duval
Tygh Duval

Level 2 Expert

290 Answers

Pablo Gonzalez

Level 3 Expert

733 Answers

Donald DCruz
Donald DCruz

Level 3 Expert

17129 Answers

Are you a Car Amplifier Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides