(MRV-1507) Need Help Please - diyAudio
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Old 26th September 2011, 11:20 PM   #1
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Default (MRV-1507) Need Help Please

Hi i have an Alpine mrv-1507 i have it hooked up to
2 ohms after changing it from 4 ohms I a have a battery capacitor and hooked up
to 2 10" Alpine type R and my Head unit is an Alpine cda-117.

So the problem I'm having has me stumped.
i have it hooked up to 2 ohm
The sub seems fine
the subs work and there's bass but not very much bass at all.
I was getting more out of a 400 watt rms mtx amp
all the light are solid green
I set all the gains up right
wiring is all set up correctly and to spec
the subs work and there's bass but not very much bass at all.
i have no idea what to do
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Old 26th September 2011, 11:37 PM   #2
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If you have more bass with only one woofer connected, you may have one speaker wired out of phase (wires connected with reverse polarity).

I'm assuming that you have the speakers connected 2 ohm stereo. The amp isn't rated for 2 ohm mono.
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Old 27th September 2011, 12:19 AM   #3
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it's hooked up normal polarity.
so which ohms should it be set to?
1 sub isn't louder than 2
also what should my gain be set to?
right now it's set to half way.
i have the eq set up all the way
and subs on max still not as much power as it should be
i got more out of a 400 watt rms mtx amp
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Old 27th September 2011, 12:37 AM   #4
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Are the speakers dual voice coil?

What is the impedance of each individual voice coil?

The amp doesn't have an impedance switch (as far as I can remember) so I don't understand the question 'which ohms should it be set to'.

The gain setting is determined by the signal feeding the amp from the head unit.
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Old 27th September 2011, 05:02 AM   #5
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I mean I have both sub woofers wired to negative on one side and positive on the other sides positive.
I don't know the impedance of the coils
and yes it's a dual coil.

I know that a friend looked at the amp and subs and he said
all the readings are normal but it's not running how it should.
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Old 27th September 2011, 05:37 AM   #6
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If he put a meter on the speakers, ask him what the load resistance is.
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Old 27th September 2011, 09:55 PM   #7
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impedance of the coils are 4 ohms i believe.
he couldn't remember the load resistence.
if i can't fix this i was going to get a cheap LANZAR HTG257 on Ebay.
i don't know if that aamp will fry the subs so here' all the specs for both.

LANZAR HTG257 2000 WATT 2 CHANNEL CAR AMPLIFIER AMP NEW | eBay

and the sub woofer specs are here.
Alpine SWR-1042D (SWR1042D) 10" Dual 4 ohm Type-R Car Subwoofer
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Old 28th September 2011, 02:02 AM   #8
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well kind of sounds like you have the subs wired to 8ohms, then at the amp, i'm assuming you have it one sub per side? or do you have it bridged? either way that would be 8ohmsx2 stereo (equal to 16ohms bridged), or 4ohms bridged. sounds more like 8ohms stereo, which would put you at under 75watts per. doubble check the resistance and wiring on the subs, and put them at 2ohms stereo. you should be getting 600rms @12v, and 900rms@14.4v this way.
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Old 28th September 2011, 02:04 AM   #9
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so, the subs would have 2 jumpers, so the wires connect both positives on the coils together, and both negatives together. if you only have one jumper from the one negative to the other positive, and then the speaker wires on the other 2 unused terminals, then that is series 8ohms.
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Old 28th September 2011, 02:22 AM   #10
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This is how i have it wired right now so it is bridged know the subs are fine they're brand new, But as for the resistance I'd have to go get that checked out tomorrow here. the subs aren't even close to what I've seen on other MRV-1507. could it possibly be something with the car like I've noticed a squeaking sound from my alternator but people say that shouldn't be the problem. All lights stay green Music light blinks when it's receiving music like it should...

This is the diagram I have it wired to.

http://m.seimg.net/product/img/subwo...ch_bridged.jpg
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