Amplifier/Sub Issue

[smms25 10+ year member]

Okay , so I installed my amplifier and sub into my mazda3 today.

List of Equipment:

Alpine MRD-301 Mono amp

12" MTX 4500 SVC sub

Navone Engineering Line out converter

- I installed the amp, no problem. Powers up fine, 12.1 volts to it, no error codes nothing

Issue: the sub has barely ANY output, I put my ear right on it and it makes some strange noise, hard to explain but it is responding to bass, but its very very quiet.

Any ideas?

- my thought: bad speaker wire connectors (i had to use some old terminals to the amp (not high quality either) and the speaker terminal on my box sucks,

so should I start there?

I also have a crap load of extra rca, so I just coiled it up under the seat, could this cause any issues??

Click to read more...

 

[project f-150 10+ year member]

Did you double check to make sure line out converter is not wired out of phase? Or are subs possibly out of phase? Is there a level adjustment on L.O.C.?

 

[SicAudio 5,000+ posts]

could be alot of reasons try just 1 sub that amp doesnt really have enough juice for even 1 of those subs. and recheck all the wiring ect...

 

[project f-150 10+ year member]

Also are the subs wired series or parallel?

 

[smms25 10+ year member]

**edited** sorry guys, only one subwoofer

I made sure all my positives were to positives and all that

The LOC does have adjustments but they set to maximum from the factory, I was told to leave those alone

 

[project f-150 10+ year member]

Check the input sensitivity switch. Then check to make sure the subsonic filter is set lower than your low pass filter and that they arent close to the same freq.

 

[smms25 10+ year member]

http://cartoys.com/cartoy/pdfs/mrdm300_manual.pdf

okay, the different tuning options are listed at page 10, I understand atleast which buttons to press for the subsonic filter and low pass filter... not sure what you mean by input sensitivity? can you explain that

 

[project f-150 10+ year member]

Which amp do you have? In your first post you said it was the 301 but you posted a manual for the 300? The 301 has a switch the adjust the input sensitivity (input level). Did you check what freq's your LPF and Subsonic filters were set at?

 

[smms25 10+ year member]

Okay, its the MRD-300, sorry about the confusion,

I havent checked the frequencies yet, I definately will, just wanted to clear up what this input sensitivity was.... so yeah MRD-300, is the amp, powering MTX 4512-04 12" sub...