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12 not thumping why?

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=95938
Printed Date: May 27, 2022 at 4:56 PM


Topic: 12 not thumping why?

Posted By: 96gtp
Subject: 12 not thumping why?
Date Posted: July 26, 2007 at 5:39 PM

Ok finally got it all wired and installed today. The amps come on fine, well they light up. The speakers sound amazing being pushed through the amps. I am loving it. But my SUB is not thumping. The amp light is on. No fuses are being blown. I have the gain set to normal. I opened up the sub box and rewired the subs the same way they were only cleaned it up a bit. When the stereo is going you can hear and feel (with my hand) a very small amount of thumping, but I mean really little.

Here are the specs of my system
SPECS:
ALPINE CDA-9885 HeadUnit
CEA-2006 Power Rating (4Ohm@14.4 V =1% THD+N), S/N 80dBA (Ref: 1W into 4Ohm): 16W x 4
Max Power Output: 45W x 4

Alpine Type R 6x9 SPR69C
RMS Power Output: 100W
Peak Power Output: 300W

Alpine Type R 5.25 SPR13C
Max RMS Power Output: 90W
Peak Power Output: 270W

Alpine Type R 12" Dual Voice Coil SUB
Power Handling Capacity (RMS): 500W
Power Handling Capacity (Peak): 1500W

Alpine V-Power Mono Power Amplifier (for Subwoofer) MRP-M350
700W x 1 (Max)
• 350W x 1 RMS [2 Ω @14.4V (1%THD)]
• 200W x 1 RMS [4 Ω @14.4V (1%THD)]
• Bass Engine (Variable LP Crossover, Bass EQ)

Alpine V-Power 4/3/2 Channel Power Amplifier MRP-F240
- 4/3/2 Channel power amplifier
- Built-in Crossover
- Blue Power Status LED
- 75Wx4 (MAX)
- RMS 14.4V Power
- 100W x 2 [4Bridged (0.3%THD)]
- 50W x 4 RMS [2(0.3%THD)]
- 40W x 4 RMS [4(0.08%THD)]



Replies:

Posted By: installerman23
Date Posted: July 26, 2007 at 5:51 PM
Checked the RCA's? Worth a try, sometimes its easy to get the polarity wrong.

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installing, one day at a time..




Posted By: 96gtp
Date Posted: July 26, 2007 at 6:33 PM
installerman23 wrote:

Checked the RCA's? Worth a try, sometimes its easy to get the polarity wrong.
Ok I went out and switched them around. I now have some sound and movement. But the sub is giving off alot of cracking. And it shuts down as if it turns off at about level 15 on the Volumn. But the light is still on the AMP and no blown fuses.

Does this sound like the sub is shot?




Posted By: Alpine Guy
Date Posted: July 26, 2007 at 7:35 PM
Is your sub output on the head unit turned to on?

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2003 Chevy Avalanche,Eclipse CD7000,Morel Elate 5,Adire Extremis,Alpine PDX-4.150, 15" TC-3000, 2 Alpine PDX-1.1000, 470Amp HO Alt.




Posted By: 96gtp
Date Posted: July 26, 2007 at 10:34 PM
Alpine Guy wrote:

Is your sub output on the head unit turned to on?
Yup that was the first thing I did with the HU. I also turned off the internal AMP




Posted By: aznboi3644
Date Posted: July 27, 2007 at 2:20 PM
how is the sub wired?? What impedance??? How is your gain set?? Boost??




Posted By: willdkartunes
Date Posted: July 27, 2007 at 10:22 PM

aznboi3644 wrote:

how is the sub wired?? What impedance??? How is your gain set?? Boost??

The answer to these questions would really help us narrow in on the problem... I too am curious to hear what you consider setting the gain to "normal" is.



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Do whatever makes you happy in life without diminishing the happiness of others




Posted By: 96gtp
Date Posted: July 27, 2007 at 11:15 PM
aznboi3644 wrote:

how is the sub wired?? What impedance??? How is your gain set?? Boost??
I can answer some of these questions.

The sub is wired like this: there are 4 terminals on the sub. the black terminals are individually wired to one red terminal then they are wired to a box connector then on the outside of the connector to the AMP.

Since it is wired this way I would suspect 2 ohms impedance? I dont know about it though as I am just getting into car stereos. The gain is set on the NORMAL setting. There is a min 4v setting then a normal setting and then one more higher. Everything else I have set to just above the MIN settings on the dials.




Posted By: dwarren
Date Posted: July 27, 2007 at 11:29 PM

My money is on the deck, the sub setting isn't right. Change it to sub system two. I think every time I've had to install an Alpine deck with a sub, I check everything, and it's always that stupid setting.



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Posted By: 96gtp
Date Posted: July 27, 2007 at 11:47 PM
dwarren wrote:

My money is on the deck, the sub setting isn't right. Change it to sub system two. I think every time I've had to install an Alpine deck with a sub, I check everything, and it's always that stupid setting.


Like I said I turned the subs output to on and turned it all the way to 10 out of 15. If you have the sub output turned off you can not adjust the sub setting cause it does not show up.

But I dont know what you mean by sub system two.




Posted By: audiomaninc
Date Posted: July 28, 2007 at 10:34 AM

96gtp] wrote:

QUOTE=aznboi3644] how is the sub wired?? What impedance??? How is your gain set?? Boost??
I can answer some of these questions.

The sub is wired like this: there are 4 terminals on the sub. the black terminals are individually wired to one red terminal then they are wired to a box connector then on the outside of the connector to the AMP.

Since it is wired this way I would suspect 2 ohms impedance? I dont know about it though as I am just getting into car stereos. The gain is set on the NORMAL setting. There is a min 4v setting then a normal setting and then one more higher. Everything else I have set to just above the MIN settings on the dials.[/QUOTE]

WHOA WHOA WHOA!  Take the sub out of the box.  Connect both black (-) terminals together, and connect both red(+) terminals together.  Then connect the two reds to the red terminal on your box connector, and the two blacks to the black terminal on your box connector.  This will result in a 2 ohm load to your amplifier and you will be fine.  Hope it helps!  posted_image



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2003 Dodge Neon R/T
Alpine CDA9813, RF T2000.1bd, RF T162S, RFT142C, RF T600.4, RF T215D4
140.7 @ 28Hz




Posted By: aznboi3644
Date Posted: July 28, 2007 at 3:22 PM
you still haven't answered what impedance the coils are

Use this calculator and wire the subs correctly

Woofer wiring calculator




Posted By: 96gtp
Date Posted: July 28, 2007 at 5:59 PM
aznboi3644 wrote:

you still haven't answered what impedance the coils are

Use this calculator and wire the subs correctly

Woofer wiring calculator
it says on the back of the sub 4ohm+4ohm so does that mean it is an 8ohm Sub?

here are the pics of the sub when I took it out today.
posted_image
posted_image
posted_image
posted_image




Posted By: 96gtp
Date Posted: July 28, 2007 at 6:02 PM
here is the link to the sub information
https://www.crutchfield.com/S-ZPOet0mqPcI/cgi-bin/ProdView.asp?i=500SWR1241




Posted By: 96gtp
Date Posted: July 28, 2007 at 6:09 PM
here is how the dials are set on the AMP. Kind of hard to see but that is the best my camera can do.

posted_image

The gain is set to the very MIN now.




Posted By: aznboi3644
Date Posted: July 29, 2007 at 3:05 AM
How did you set your gain??

What level was the head unit on???

What level was the sub level set at??

Where is your crossover set at??

Check to see if the rcas are loose behind the head unit

Those pics are blurry and hurt my eyes lol




Posted By: DYohn
Date Posted: July 29, 2007 at 10:09 AM
Looks like your woofer is wired correctly.  Take a look at the crossover settings.  Set the LP on the amplifier all the way to its max setting, or bypass the crossover on the amp.  Check the subwoofer crossover setting in the head unit and set it to, oh, 80 or 100 Hz.  Then set your amplifier input gain properly.

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Support the12volt.com




Posted By: 96gtp
Date Posted: August 17, 2007 at 5:42 PM
SWR1241D Sub.
Tested the connections on the sub
C1- 1.1 ohms
C2- 3.8 ohms

Hooked it back up to the amp. The Amp is working. The Light is on.
Turned on the stereo andset up the subwoofer settings on the HU
at the connectors on the box I get with no music
C3- 11.0 ohms

Settings on the Amp
Gain- set to min
Bass EQ- 0db
Lp filter 50Hz

HU Settings
Sub output- ON
Sub output level 0-15 Set to- 10

Turned on the tunes.......
Once again with the music low and all the settings set where they are, pretty much nothing coming through.

Turned the gain up to Avg, the sub started to come to life. But it sounds like crap.

Adjusted the Bass EQ around and
Adjusted the LP Filter around.

The sub started to make more sub sounds but it sounds like crap. Kind of if you put your lips together and made a fart pipe sound from a dirt bike.

I turned the volume up to 25. The system sounded like doodie and the sub stopped working all together.

I think this sub is FU@#ed Up.




Posted By: KarTuneMan
Date Posted: August 17, 2007 at 7:29 PM

SWR1241D Sub.
Tested the connections on the sub
C1- 1.1 ohms
C2- 3.8 ohms

Am I reading this correctly?

1 coil is 1.1ohm   and the other is 3.8?

Thats not quite right.



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Posted By: aznboi3644
Date Posted: August 18, 2007 at 12:56 AM
KarTuneMan wrote:

SWR1241D Sub.
Tested the connections on the sub
C1- 1.1 ohms
C2- 3.8 ohms

Am I reading this correctly?

1 coil is 1.1ohm   and the other is 3.8?

Thats not quite right.




yeah something isn't right at all

try using only the coil that reads 3.8 ohms




Posted By: 96gtp
Date Posted: August 18, 2007 at 10:42 AM
Will give that a try.




Posted By: 96gtp
Date Posted: August 20, 2007 at 12:57 AM
Was talking to someone today and they told me that since one of my voic coils is at 1 Ohms and the other is at 3.8 Ohms that that would dontate that I have a Blown SUb. IS this true?




Posted By: aznboi3644
Date Posted: August 20, 2007 at 12:22 PM
means you may have one messed up coil...the other coil should be fine to use...I wired my friends sub(same as yours) using one coil and its been fine for a couple years...not problems




Posted By: jvillefinest
Date Posted: August 22, 2007 at 3:17 PM

push on it! in and out...if you get any resistance or any "crunchy" it toast. thats what it sounds like...if its still good there....try the drill battery trick...hook the speaker wires to the + and - of  a drill battery and see if you cant get it to move. Try it both ways and see if it will move in and out...if it does then its still good...i will be suprized if it does.



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2007 Acura TSX
SQ setup in the works




Posted By: 96gtp
Date Posted: August 23, 2007 at 5:42 PM
jvillefinest wrote:

push on it! in and out...if you get any resistance or any "crunchy" it toast. thats what it sounds like...if its still good there....try the drill battery trick...hook the speaker wires to the + and - of a drill battery and see if you cant get it to move. Try it both ways and see if it will move in and out...if it does then its still good...i will be suprized if it does.


yeah it is crunchy when I push in and out on the speaker. I guess it is done. :-(





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