Please help. 20 hour install, now one sub louder than other. 2 momo amps.

[funkyab 10+ year member]

I just completed a very exhaustive install on my boat where i added three (2 for subwoofers) new profile amplifiers.

I have 1 420rms profile mono amplifier (1 for each sub) going to each DVC subwoofer wired at 2 ohms in seperate enclosures.

for some reason, one speaker has much higher output and is louder than the other and i can not figure out why. Also the one that is louder seems to sound more dirty especially when it hits hard on an extreme note (is this clipping?) sounds a bit like if you were to touch a vibrating device such as a cordless trimmer against a wooden door on deep notes.

all of the level settings are set the same on both amplifiers although i havent had a chance to tweak yet but seems like they should sound the same if leveled the same.

I seriously doubt that it is possible that i would have done this but, if for some reason i indeed do this, would this be happening if i accidently wired one of the DVC subwoofers incorrectly? as i mentioned they should both be at 2 ohms bit isf one was at 2 and another at a different ohm such as 4 or 8 could this be a cause?

is one speaker blown?

also, is it possible for a subwoofer to be out of phase if it is connected by itself to a mono amp?

Please give any help possible as i am a bit stressed out from this result after a 15+ hour install!!

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[DBfan187 5,000+ posts]

What kind of box is it? Sealed(sealed up tight inside)? Ported?

 

[funkyab 10+ year member]

oh yea, left that out.... they are sealed enclusures not leaking air (correct size)

thanks again

Adam

 

[blackgeltabs 5,000+ posts]

I just completed a very exhaustive install on my boat where i added three (2 for subwoofers) new profile amplifiers.I have 1 420rms profile mono amplifier (1 for each sub) going to each DVC subwoofer wired at 2 ohms in seperate enclosures.

for some reason, one speaker has much higher output and is louder than the other and i can not figure out why. Also the one that is louder seems to sound more dirty especially when it hits hard on an extreme note (is this clipping?) sounds a bit like if you were to touch a vibrating device such as a cordless trimmer against a wooden door on deep notes.

all of the level settings are set the same on both amplifiers although i havent had a chance to tweak yet but seems like they should sound the same if leveled the same.

I seriously doubt that it is possible that i would have done this but, if for some reason i indeed do this, would this be happening if i accidently wired one of the DVC subwoofers incorrectly? as i mentioned they should both be at 2 ohms bit isf one was at 2 and another at a different ohm such as 4 or 8 could this be a cause?

is one speaker blown?

also, is it possible for a subwoofer to be out of phase if it is connected by itself to a mono amp?

Please give any help possible as i am a bit stressed out from this result after a 15+ hour install!!

No 2 amps are the same, levels may need to be adjusted on the one that is weaker. Also wiring would also be a very large posibility. Easy way to do this is to disconnect the amp from the box and put a ohm meter on the box terminals, see if they match up. If one is out of phase then it should be moving heavily and making next to nothing for noise, I highly doubt one is out of phase though.

 

[funkyab 10+ year member]

thanks for the advice, just to be clear, i will use an ohm meter to make sure that the speakers are wired the same.?.

i will adjust the levels but is it common that with 2 subs/2amps that are identical will sometimes require different level settings?

I was wondering about the momo/out of phase issue because regardless the polarity of the wires into each sub, there is no change in sound. with my pervious stereo amps, i could definately hear a difference in sound when i switched the polarity.

Errrrr... sucks to be so puzzled and have problems after sooo much work

A

 

[blackgeltabs 5,000+ posts]

thanks for the advice, just to be clear, i will use an ohm meter to make sure that the speakers are wired the same.?.
i will adjust the levels but is it common that with 2 subs/2amps that are identical will sometimes require different level settings?

I was wondering about the momo/out of phase issue because regardless the polarity of the wires into each sub, there is no change in sound. with my pervious stereo amps, i could definately hear a difference in sound when i switched the polarity.

Errrrr... sucks to be so puzzled and have problems after sooo much work

A

I told you I doubt its phase because you usually only run into that running amps in stereo mode. As for 2 amps 2 subs, I used to have 2 12w3's and 2 500a2's. One 500 was ratted at 782 the other was 736 so obviously they had to be adjusted differently. IM about 95% sure that this is whats wrong. Other than that you would be looking at a bad wire/fuse/rca cable thats not putting the proper voltage to amp causing it to run weaker, but i highly doubt its this either.

 

[Norcalracer283 10+ year member]

if they were wired in at differnt ohm loads.... you would know. There is a huge difference in power between a 2 ohm load and an 8 ohm load.

 

[helotaxi 5,000+ posts]

I would have to guess that wiring is the problem. And, yes, the distortion that you are hearing from the loud one is probably clipping. I would guess that one is wired to 2 ohms and the other is wired to 8. Is the quiet one making much sound by itself? It is possible that you could have gotten the coils of that sub wired out of phase with each other and they are cancelling eachother out magnetically and all but eliminating the sound from the sub. Is is not a phasing problem between the two subs as that would cancel the sound from both subs not just one. Differences in amps is not the problem either. A difference of a few watts is not audible. You would have to have a difference of around 25% befire the difference would be audible. Check your wiring.

 

[volume_lvl_n9ne]

dude for the price if you got the amp to power it Diamond TDX... lookin at about 6-7hundred per sub but if you want the best you got to shell out the green man

 

[saywhat? 5,000+ posts]

ummmmm not really....equipment is a small part of how something sounds......yes it makes a HUGE Diffuerence but the install makes more of a difference....my 8's will hit harder than some 12 inch installs when they are done.