Amp installation problem

[mike98789 10+ year member]

I am installing Alpine 4 channel F300 amp in my 04 miata. I connected the amp with 2 RCA cables to the head unit. connected the speakers to the output of the amp. Sound just from one set of speakers and not all 4. What can be the problem? How do I set tune the amp to play normally. I have Pioneer Head Unit. Alpine F300 amp. Infinity Kappa component speakers and Polk audio 3.5 speakers for the rear.

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[AATorres28 10+ year member]

When running a 4ch amp, you generally need to use 2 sets of RCAs(4 jacks 2 red 2 wht) unless there is some sort of pass through switch. I read up on what I think is your amp and I didn't see one. If this is the case, you will need to run another set of RCAs. As far as tuning, Im not the best person to explain that

 

[mike98789 10+ year member]

i do have 2 sets of rca cables running.

 

[OmegaBunny 10+ year member]

Do you have them connected correctly? Did you try switching them? On the HU is there a setting for output that you need to switch from internal to outputs?

 

[Crapalier 10+ year member]

You ran two separate rca cables correct? The sound is only comming out of the front or just the back, right?

try switching the rca cables around on the amp, if you now get sound out of speakers that you didnt before but the others are quiet its either an rca or headuint issue. If your headunit only has 2 sets of preouts, one of them might be a sub/fullrange switchable and its set to sub right now.

 

[OmegaBunny 10+ year member]

Whats the model of your HU

 

[AATorres28 10+ year member]

You ran two separate rca cables correct? The sound is only comming out of the front or just the back, right?
try switching the rca cables around on the amp, if you now get sound out of speakers that you didnt before but the others are quiet its either an rca or headuint issue. If your headunit only has 2 sets of preouts, one of them might be a sub/fullrange switchable and its set to sub right now.

^^this^^

 

[mike98789 10+ year member]

model # of the head unit is DEH-7300BT. I did not cnange any settings on the unit.

 

[mike98789 10+ year member]

yea it has two outs. R/sw and F. I should look in the settings of the radio?

 

[Crapalier 10+ year member]

Yes, there should be a setting to change that rear preout to full instead of s/w.

I'm not sure how it is on newer pioneer units but on my older one, you hold down function when its off and cycle through the options.

 

[mike98789 10+ year member]

I will look at it tomorrow. Thank you.

 

[ColterDC 10+ year member]

I'm not sure how it is on newer pioneer units but on my older one, you hold down function when its off and cycle through the options.

Yep, if his HU is like my newer Pioneer decks then it will need to be off to change that setting.

And I believe the default setting has that output "Off".

 

[mike98789 10+ year member]

i think i got it //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[mike98789 10+ year member]

It worked. Thank you for the help.