amp/sub combo

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=82404
Printed Date: April 28, 2024 at 3:54 PM

Topic: amp/sub combo

Posted By: nothingface9
Subject: amp/sub combo
Date Posted: September 02, 2006 at 7:19 PM

I plan on using this amp:

https://www.rockfordfosgate.com/products/product_details.asp?cat_id=2&series_id=7&family_id=22&item_id=95251&locale=en_US

with 2 of the following subs:

https://www.rockfordfosgate.com/products/product_details.asp?cat_id=4&series_id=32&family_id=12&item_id=91833&locale=en_US
https://www.rockfordfosgate.com/products/product_details.asp?cat_id=4&series_id=32&family_id=12&item_id=91835&locale=en_US

Im looking for the best way to wire this combo up and which impendance subs to buy, the 2 ohm or the 4 ohm. I want these subs to be loud tight and puncy for my metal i listen to.

Thanks for any advice :D

Replies:

Posted By: nothingface9
Date Posted: September 02, 2006 at 7:33 PM

And one more thing, is it recomended to get a capacitor for this set up as well or should i have enough power?

Posted By: Flakman
Date Posted: September 02, 2006 at 8:09 PM

A capacitor will not give you more power. A capacitor at best will simply be band aid for your electrical system if it is having problems. If you upgrade the "Big 3", that will take care of most issues you may have. If you still have problems, then an upgraded alternator would be the next step.

I have 2 of the T112D4 subs. Your 10s will be a very nice selection. Personally, I would choose another amp. My personal preference would be to keep the load at 2 ohm and not drop it down to 1 ohm. That amp does have cooling fans, I'm just not a fan of 1 ohm loads due to the heat.

To run the subs at 1 ohm for that amp, you'll need to get the 2 - 4 ohm DVC subs and connect them like this:

Option 1 (parallel/parallel) = 1 ohm load
Voice coils wired in parallel, speakers wired in parallel
Recommended Amplifier: Stable at 1 ohm mono

If you upgrade your amp, or get one that can supply 1000+ Watts @ 4 ohms you can wire it like this:

Option 2 (series/parallel) = 4 ohm load
Voice coils wired in series, speakers wired in parallel
Recommended Amplifier: Stable at 4

Look at the manual for the subs. They have good information regarding the recommended box size and port configurations. Make your box SOLID and AIRTIGHT. Trust me, they will find any air leak you may have. They will pump hard!

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

John | Manteca, CA

Posted By: nothingface9
Date Posted: September 02, 2006 at 8:33 PM

Awesome, thats a huge help.

Can you recomend an amp for me? Im open to anything, cost shouldnt be a problem.

My vehicle is a 2003 GMC Sierra. If i notice flickering lights and such, that means i should probobly try uping the big 3 or grabbing a cap in your opinion?

Posted By: Flakman
Date Posted: September 02, 2006 at 8:47 PM

You will find that the general concensus here will be that a Cap is not the way to go. If you are battery cannot handle the current load, the cap will only buy you a little more time before the battery gets depleted. If you are running 1000-1200 watts in a Sierra, upgrading the Big 3 should be all you need.

I wish I could say that "cost shouldn't be a problem". If this is really the case, my recommendation would be the Eclipse DA7232, and then get the T110D2 subs (2 ohm DVC) and wire each sub like this to each channel:

Option 2 (series) = 4 ohm load
Voice coils wired in series
Recommended Amplifier: Stable at 4

That shoud hit like a Tyson uppercut! Of course...stating that the cost shouldn't be an issue...others may chime in with a change in subs, but I don't have any problem with your sub choice.

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

John | Manteca, CA

Posted By: nothingface9
Date Posted: September 02, 2006 at 9:03 PM

Hmm well to be honest, that amp might be a bit over my price range im looking to spend.

The price on the rockford amp was about where i want to be. Also, the dimensions on that rockford amp are almost exactt for the amp area ont he box im using. 18 x 13-15 inches.

Any other suggestions?

Posted By: Flakman
Date Posted: September 02, 2006 at 9:12 PM

Don't worry about it. I would love to have the amp myself...but can't quite swing that kind of change.

The Rockford amp will push those subs fine. You will just need to wire the subs like

Option 1 (parallel/parallel) = 1 ohm load
Voice coils wired in parallel, speakers wired in parallel
Recommended Amplifier: Stable at 1 ohm mono

As I said, that amp will do the job, and it is fan cooled (which is what will be needed running at 1 ohm). The amp will need to be mounted somewhere that allows for plenty of ventilation.

Anyone else have some amp suggestions around the $700 mark?

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

John | Manteca, CA

Posted By: nothingface9
Date Posted: September 02, 2006 at 9:24 PM

https://www.subthump.com/images/silverado/03dual10-2.jpg

Thats my box. So it should have plenty of ventilation. Ill probobly hold off a few days before buying the amp and see if i get any more suggestions.

thanks

Posted By: Flakman
Date Posted: September 02, 2006 at 9:46 PM

Just make sure that you have at least .8 cubic feet of airspace per side. Make very sure that the enclosure is sealed, and if possible, mounted to the vehicle. Hopefully someone will show up with some other amp suggestions. The guys that work shops will have a good idea of what is available.

Happy thumping!

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

John | Manteca, CA

Posted By: kfr01
Date Posted: September 02, 2006 at 10:01 PM

nothingface9 wrote:

I want these subs to be loud tight and puncy for my metal i listen to.

You're focusing on the wrong things.

Wiring will not change the sound of the subwoofers.

You must focus first on the subs and the enclosure.

The enclosure will determine, to a large extent, the character of your sub bass.

For metal, I think I would probably choose a ported enclosure.

Also, I don't know what I think about those subwoofers. Is the efficiency located somewhere?

Also, for metal I'd go for FAST woofers. Try these:

https://www.adireaudio.com/Mobile/BrahmaSeries.htm

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New Project: 2003 Pathfinder

Posted By: nothingface9
Date Posted: September 02, 2006 at 10:01 PM

Hmm each side is .7 cubic feet. Will that be a huge problem?

Posted By: Flakman
Date Posted: September 02, 2006 at 11:37 PM

You definitely want to match the sub and enclosure. You need to make sure how much airspace your sub needs. The T110s need about .85 cubic feet. You really don't want to skimp on the specs. I know that Alpine Type R subs are good in .65 cubic feet. I don't know if anything else can go that small. You want to make sure these match...otherwise you can have your subs sounding like doodie regardless of what you use.

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

John | Manteca, CA

Posted By: kfr01
Date Posted: September 03, 2006 at 12:06 AM

Image Dynamics IDQ drivers work in these small box sizes too. That's why I own one. What's more? Good SQ.

I've been very pleased. Highly recommended.

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New Project: 2003 Pathfinder

Posted By: vinspo
Date Posted: September 03, 2006 at 6:21 PM

Diamond Audio TDX Subwoofers work very well in small sealed enclosures too, a much better value than RF. Their D6 line of amplifiers are of high quality and the monoblocks run pretty cool temps. Just another brand to consider.

Posted By: nothingface9
Date Posted: September 03, 2006 at 10:01 PM

So, i looked around and found a pair of subs that fit my box in air space needed and mountin depth.

https://mobile.jlaudio.com/products_subs.php?series_id=6

Now, i just need help in picking an amp that will drive these things. Im not sure how to decide how much power i need to supply 2 of these things with at 4 ohms or 1 ohm.

The amp needs to be within 13x18 inches in dimensions to fit its spot. Any suggestions would be appreciated.

Posted By: kfr01
Date Posted: September 03, 2006 at 10:16 PM

83.something efficient? Are you sure you want those subs?

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New Project: 2003 Pathfinder