Bass issues

[ferenza]

Today i just put my sub back in my car because i had previously thought it was blown.it wasnt , just a faulty ground wire. I had hooked it back up and now it doesnt thump anymore like it used to before i took it out. I turned the gain all the way up just to see if it would thump and it barely flexes.Here are my spec to the amp and sub:

(AMPLIFIER)
Alpine MRv-f545
V12 High Power Amplifier
RMS Power Rating:
125 watts x 4 chan. @ 4 ohms
250 watts x 2 chan. (Ch 3-4 Only) @ 2 ohms
500 watts x 1 chan. (Ch 3-4 Only) @ 4 ohms Bridged

(SUBWOOFER)
Pioneer TS-W309S4
12" Single 4 ohm Champion Series Subwoofer
Power Handling:
Peak: 1,400 watts
RMS: 400 watts
Impedance: Single 4 ohm

I have the amp bridged on channel 3-4 and i can barely feel or hear any bass.Most of my bass is from my speakers.Im running infinity Kappa speakers all around(6x9 in the deck , 6.5 in the front) and 6 independent tweeters.2 on the a,b, and c pillars.

[illinois_erik]

maybe it accidentally set the filter on 3/4 to high pass or off

http://vault.alpine-usa.com/products...M_MRV-F545.pdf

[Ravens_CB7]

It could be how you conected the cable to the sub, try fliping them cuz mine do that if its not conected right they sound like s*** or they don't sound at all -___-

[dj_ender]

Whats the crossover set at for the sub?

[nine_deuce]

When you're running 1 sub, you can't hook the polarity up wrong. And did you hook up the positive on the sub to like the positive on channel 3 and the negative on the sub to the negative on channel 4?

[dj_ender]

When you're running 1 sub, you can't hook the polarity up wrong. And did you hook up the positive on the sub to like the positive on channel 3 and the negative on the sub to the negative on channel 4?

Not true. You can have the sub out of "phase" with the rest of the system. In fact, many amps have a 0-180 phase switch on them.

[SPLCB7]

I would check your high low pass filter switch at the amp and in the deck..... make shure your subs arnt blown two run a volt meter two them and see what ohm load you get if its off you could have a loose tencel lead or blown coil....or bad connection's power ground extra there's a billion things it could be you just have two go through it with a volt meter and find the problem could be your amp or even your rca's.....good luck

[ferenza]

maybe it accidentally set the filter on 3/4 to high pass or off

http://vault.alpine-usa.com/products...M_MRV-F545.pdf

Its set on 3/4 low pass filter

It could be how you conected the cable to the sub, try fliping them cuz mine do that if its not conected right they sound like s*** or they don't sound at all -___-

I remember hooking them up correctly and put tape around the negative wire so i wouldnt mess up but i will try switching them around

Whats the crossover set at for the sub?

Its set at low pass filter

When you're running 1 sub, you can't hook the polarity up wrong. And did you hook up the positive on the sub to like the positive on channel 3 and the negative on the sub to the negative on channel 4?

yes, exactly what i did

Not true. You can have the sub out of "phase" with the rest of the system. In fact, many amps have a 0-180 phase switch on them.

I dont see one on this amp.

I would check your high low pass filter switch at the amp and in the deck..... make shure your subs arnt blown two run a volt meter two them and see what ohm load you get if its off you could have a loose tencel lead or blown coil....or bad connection's power ground extra there's a billion things it could be you just have two go through it with a volt meter and find the problem could be your amp or even your rca's.....good luck

I checked the ohms on the sub and its at 4.4 Ohms.its a single voice coil speaker . its still brand new and so is the radio(2 months old) .i changed the ground wire to a 0 gauge.i changed the power wire from 8 to 4 gauge.The rca's - it plays just as low with 1 as it does 2 hooked up. no change in bass at all.


I also have my rockford fosgate p.325.2 amp collecting dust. when i had it hooked up before it smelled like burning ham when i turned it on. it was set up low pass, 160Hz, 75% gain and the deck was set at 0 bass.i opened it a few minutes ago and i didnt smell anything or see any burn spots/marks on the board.

[dj_ender]

I mean what frequency is the crossover set at?

[ferenza]

I mean what frequency is the crossover set at?

I set the frequency in the middle but im gonna go check it out

Edit: I have it on x20 and the knob is a little past half there are no numbers

[dj_ender]

I set the frequency in the middle but im gonna go check it out

Take a pic of the end if the amp with all of the switches on it? Maybe we can get an idea

And do you have sub control on the deck?

[ferenza]

OK i went and took pics, they may be a bit blurry did them with my phone hope i did good/ there is no sub control on my deck which is a Pioneer DEH-1300MP:
(Frequency)

(Gain 0.2v)

([COLOR="rgb(255, 140, 0)"]Bass Boost[/COLOR])

([COLOR="rgb(255, 140, 0)"]Ground wire to strut bar[/COLOR])

([COLOR="rgb(255, 140, 0)"]Connections[/COLOR])

([COLOR="rgb(255, 140, 0)"]Knobs[/COLOR])

the 3/4 setting is on Low pass

[dj_ender]

Is the first pic saying the crossover on 3/4 is 2khz? Do you have sub control on the deck?

[SPLCB7]

Its set on 3/4 low pass filter

I remember hooking them up correctly and put tape around the negative wire so i wouldnt mess up but i will try switching them around


Its set at low pass filter

yes, exactly what i did


I dont see one on this amp.



I checked the ohms on the sub and its at 4.4 Ohms.its a single voice coil speaker . its still brand new and so is the radio(2 months old) .i changed the ground wire to a 0 gauge.i changed the power wire from 8 to 4 gauge.The rca's - it plays just as low with 1 as it does 2 hooked up. no change in bass at all.


I also have my rockford fosgate p.325.2 amp collecting dust. when i had it hooked up before it smelled like burning ham when i turned it on. it was set up low pass, 160Hz, 75% gain and the deck was set at 0 bass.i opened it a few minutes ago and i didnt smell anything or see any burn spots/marks on the board.

Mabe turn up your bass on your deck above 0?
OK it sounds like your subs coil is burnt pull it out and look at it with a flash light and see if your coils burnt. If its not copper in color it's dark then you have burnt your coils ie. They're blown omost just a little more play and no more sub. I could be wrong so I would check. If you have tryed 2 different amps and got the same results its deff your subs or your RCA output on your deck. There's not many other reasons you wouldn't get sound.

[SPLCB7]

Wait this is a 4 channel amp and your rca's look like there on channel 3-4 try channel 1-2 and switch off channel 3-4 insted of having it on lowpass....