Question about Car Amplifiers

1 Answer

Alpine ok i have a problem when my headunit is turned on my subs go at full thump at full excursion nonstop even when the head unit volume is all the way down like if both rca's were making contact i bought a different pair of rca's but same results, this happens without my eq connected,but when i connect and turn the eq volume almost 1/4 of the way and it goes off goes crazy nonstop, when eq connected i can hear a thump when i change songs or a bass note from the cd thats playing from the HU not music but the noise inside the HU..please help my setup: alpine iva d310 earthquake eq audiocontrol "epicenter" MA Audio HK802sx 4400 watt amp tsunami 2 farad cap 4 jl audio 12w6v2 wired at 2 ohms

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: alpine

If this occurs with the head unit plugged directly into the amp (no signal processors inline, you probably have open shields on the head unit.

To check the shield ground, disconnect all RCA cables from the head unit and measure the resistance between the RCA shield on the head unit and the case of the head unit. It should read ~0 ohms.

Posted on Dec 04, 2007

Add Your Answer

0 characters

Uploading: 0%


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


3 Points

Related Questions:

1 Answer

JL Amp isn't powering subs and speakers

silly as it sounds, you may want to check your EQ settings on your headunit. Things like sub volume, SLA, loudness and balance. When they replaced your battery, those old settings were lost.

Mar 26, 2010 | Jl Audio 500/1 Car Audio Amplifier

2 Answers

Only powers subwoofers when at high volume

Well, make sure that the output level on your head unit is up, and also try adjusting the gain NEVER EVER PUT IT ON FULL GAIN BECAUSE THAT WILL CLIP THE AMP AND MAY BLOW AMP AND/OR SUB!!!

Oct 08, 2009 | Alpine MRP-M1000 Car Audio Amplifier

1 Answer

I got a pyle 1800w amp and a 1500w kenwood subs but as i increase the volume in the headunit it goes on protect mode why the other problem i got is as increase the volume in the headunit the bass of the...

The protection modes in these units ****. Most new units have them. What I do is turn down settings on deck and turn up amp as much as possible. Then the protection won't turn on because you won't have to turn it up as high.

Sep 30, 2009 | Pyle PLA1200 Car Audio Amplifier

1 Answer

Subs have almost no sound coming from them

Hello meow_mix_666,

If you have tried different amps and different subs with the same result, I'd definitely suspect that you are not getting enough of an output signal from the head unit. Checking the RCA's and perhaps using a different set of preamp outs would be a good idea.

One other possibility that you may not have considered is to check the phasing. I've run into speakers that had the markings reversed and running the subs out-of-phase on a 4-channel bridged would make a huge difference in the bass.

Hope this helps.

May 10, 2009 | Alpine MRP-F300 Car Audio Amplifier

1 Answer

Poor sound/ Unable to play anything load without distortion.

i can tell you right now base on the vehicle you have a bad system hook wosrt if you are using factory head unit

Mar 25, 2009 | Kenwood KAC-8151D Car Audio Amplifier

1 Answer

No light on Alpine MRP-M1000

Ok. Have you check the Ground and the Power connection.

Jan 25, 2009 | Alpine MRP-M1000 Car Audio Amplifier

2 Answers

Amp light flickering

do you have a capacitor its like an extra battery, if you turn the volume way up with cvr's pullin big power, it cuts out because theres not a steady flow of power.... hope this helps

Jun 30, 2008 | Alpine MRP-M450 Car Audio Amplifier

1 Answer

Cant figure out my car audio problems!!!!!

There are a couple of tests you can perform. I'd first recommend checking the shield ground. You'll need an ohm meter. The details can be found on the following page.

RCA shield ground test

You can also test the output with the multimeter. Set the multimeter to AC volts. If it's not an auto-ranging meter, set it to a voltage range of ~2v AC. Disconnect the RCA cables from the head unit. Touch one meter probe to the outer ring of the head unit's RCA jack. Touch the other probe to the metal contact in the center of the RCA jack. With the head unit near full volume and a clean signal source, you should read at least one volt on musical peaks. If you have a bass disc or a test tone disc (~60hz sine wave), use those.

May 04, 2008 | MTX Thunder 8302 Car Audio Amplifier

1 Answer

Annoying thump from two 15" kicker comps powered by a lanzar vibe 266 amp

It sounds like it may be oscillating. This can be caused by a broken ground in the signal line. You need to check the RCA shield on the head unit.You'll need an ohm meter. The following page has more details. If the head unit isn't damaged, the shield ground could be open in the amplifier.

Temporary Shield Repair

Apr 05, 2008 | Lanzar VIBE266 Car Audio Amplifier

2 Answers

Feedback/maxing out speakers.....

starting from amp,what is the rca connected directly to. headunit or adoption?

May 05, 2007 | MTX RT202 Car Audio Amplifier

Not finding what you are looking for?
Car Amplifiers Logo

Related Topics:

245 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