4 ohm dual voice coil 12"

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=82186
Printed Date: April 20, 2024 at 3:52 AM

Topic: 4 ohm dual voice coil 12"

Posted By: beatjunkie1
Subject: 4 ohm dual voice coil 12"
Date Posted: August 28, 2006 at 5:00 PM

ok stereo guys, i got one for you. I built a sealed box with a 4 om dual voice coil 12" subwoofer. I have a 2 channel amp that im going to bridge.But i have no clue on how to wire it for my application. I drew a diagram and included the specs for each componet. If some one could draw a way and different ways to wire this for optimum performance it would be great.

speaker specs

posted_image

amp specs

• 2 Channel Mosfet Power Amplifier
• 2 OHM Stable (2 Channel Mode)
• Max Power: 500W x 2
• RMS Paower: 200W x 2
• Bridgeable (4 Ohm)
• Tri-Mode Capable
• Built-in Variable Low Pass Filter: 40Hz - 150Hz
• Built-in High Pass Filter
• Built-in Variable Bass Boost: 0 - 18dB
• Gold Plated RCA Input/Output
• Channel Serparation Better than 90dB
• 0.01% THD (4 OHM)
• Signal to Noise Ratio: 103dB
• Speaker & Thermal Protection Circuit
• Frequency Response: 9 Hz - 50 KHz
• Power On/Protection LED Indicator
• Gain & Crossover Control
• Dimensions: 11"W x 2 1/2"H x 7 3/4"D

drawing

posted_image

Replies:

Posted By: DYohn
Date Posted: August 28, 2006 at 6:04 PM

Your amp is only bridgeable into a 4-ohm load or higher. You say you have one DVC speaker, so your best option is to operate at 8-ohms.

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Posted By: cloak559
Date Posted: August 28, 2006 at 6:28 PM

You need to invest in a new amp...with an 8ohm load yur only going to have about 100w running to that sub, wich is way underpowring it. Try to find yourself a 2ohm stable amp that puts out about 700-900w @ 2ohms....I have a kenwood amp for sale that would be perfect for you...

https://www.the12volt.com/installbay/forum_posts.asp?tid=82135&PN=1

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'89 Mercedes-Benz 300E
Pioneer DEH-5900UB
(2)RE Audio SX 10"s
(1)US Amps MD3D
3ft^3 @ 37Hz

Blowing up in a car accident doesnt worry me, as long as I'm putting out some major dB's when I die...

Posted By: beatjunkie1
Date Posted: August 28, 2006 at 7:33 PM

the speaker has 4 inputs/outputs so how would that work?

Posted By: cloak559
Date Posted: August 28, 2006 at 8:12 PM

Wire it parallel to show the amp a 2ohm load...

posted_image

Posted By: furflier
Date Posted: August 28, 2006 at 8:20 PM

You could just run the amp stereo.

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Posted By: cloak559
Date Posted: August 28, 2006 at 8:26 PM

furflier wrote:

You could just run the amp stereo.

If I am correct....You dont want to run a stereo signal to one sub....

Posted By: aznboi3644
Date Posted: August 28, 2006 at 9:24 PM

Why is that??? not saying your wrong...I just haven't had a problem with doing that

Posted By: furflier
Date Posted: August 28, 2006 at 9:37 PM

If there is a problem with running subs this way someone please chime in. I have done this on several setups without a problem.

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Posted By: cloak559
Date Posted: August 28, 2006 at 9:55 PM

Im not possitive on that at all, I was just figuring that a left and right signal going to the same driver would conflict...

Posted By: Flakman
Date Posted: August 28, 2006 at 10:34 PM

I have never heard that running stereo to a DVC sub is bad. I, too have run this many times without issue.

...and actually, running @ 2 ohms would not be recommended. Running bridged, the amp is only rated @ 4 ohms.

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The Flakman
I feel strange. I have deja vu and amnesia at the same time.

John | Manteca, CA

Posted By: cloak559
Date Posted: August 28, 2006 at 11:24 PM

Flakman wrote:

I have never heard that running stereo to a DVC sub is bad. I, too have run this many times without issue.
...and actually, running @ 2 ohms would not be recommended. Running bridged, the amp is only rated @ 4 ohms.

I recommended that he buy a new amp and run it at 2ohm, not the one he allready has. The only way he can wire his current setup is at 8ohms, which will be severely underpowering the subwoofer...

Posted By: DYohn
Date Posted: August 29, 2006 at 8:31 AM

cloak559 wrote:

Wire it parallel to show the amp a 2ohm load...

NO, can't do that with the amp he has. It is only stable into a 4-ohm or higher load when bridged.

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Posted By: DYohn
Date Posted: August 29, 2006 at 8:33 AM

cloak559 wrote:

furflier wrote:

You could just run the amp stereo.

If I am correct....You dont want to run a stereo signal to one sub....

There is absolutely nothing wrong with doing that. However, operating in 4-ohm stereo is exactly the same amount of power to the sub as wiring for 8-ohm mono but bridged.

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Posted By: cloak559
Date Posted: August 29, 2006 at 10:18 AM

DYohn] wrote:

QUOTE=cloak559]
Wire it parallel to show the amp a 2ohm load...

NO, can't do that with the amp he has. It is only stable into a 4-ohm or higher load when bridged.

[/QUOTE]

If you read the last post i made there...I was stating that i suggested he buy a NEW 2ohm stable amplifier and wire it that way...Im aware that he cannot wire his existing amp at 2ohms...But his existing amp does not have enough juice for that sub.....

As for running a stereo amp to one sub, i've always used monoblocks so i was just making an assumption. I guess I was wrong...

Posted By: Flakman
Date Posted: August 29, 2006 at 11:17 AM

Sorry bout that Cloak, must have skipped over the new amp thing. I don't care for Kenwood, that would be my recommendation anyway.

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The Flakman
I feel strange. I have deja vu and amnesia at the same time.

John | Manteca, CA

Posted By: stevdart
Date Posted: August 29, 2006 at 10:20 PM

If the amp is rated at 2 X 100 watts at 4 ohms, then the output into a 8 ohm bridged load would be 200 watts. That may work just fine in your application and is worth a try.

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Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.