dvc help

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=18238
Printed Date: May 10, 2024 at 2:03 AM

Topic: dvc help

Posted By: saitho
Subject: dvc help
Date Posted: August 29, 2003 at 1:48 PM

hi im a newbie in car audio y buy this system and im planing to install it in a ford pick up 79 single cab the thing is im not sure how to connect the subwoofer because is a DVC

the amp has 4 cahnnels i want to use two in stereo for the 6x9 and the other two in mono bringed for the sub
what you think i need something more?
what size of enclosure you recomend?
any suggestions are well apreciated

Replies:

Posted By: DYohn
Date Posted: August 30, 2003 at 12:07 PM

The amp you want to use is 2-ohm stable in stereo, and your sub has dual 4-ohm VCs. Without adding a seperate sub amp, you should wire this system with amp channels 1 and 2 driving your 6X9's, and bridge channels 3 and 4 to ONE voice coil on your Audiobahn sub. Do not connect the second voice coil at all. This will give you 25 WPC into 4 ohms to the 6X9's and 50 watts into 4 ohms to the sub, which is pretty much the safe limit with the setup you have illustrated above.

Try using about a 0.9 cu ft sealed enclosure for the woofer. I believe that is what Audiobahn recomends... but check the info that came with the driver or the Audiobahn web site first.

Posted By: saitho
Date Posted: August 31, 2003 at 3:00 AM

connecting only one voice coil will not damage the sub? posted_image

Posted By: DYohn
Date Posted: August 31, 2003 at 8:58 AM

saitho wrote:

connecting only one voice coil will not damage the sub?

Nope.

Posted By: italnpimp59
Date Posted: August 31, 2003 at 8:01 PM

oh yeah it will, do not connect it to just one coil.....i have heard from several pros that it is bad for the subs...and i recently saw a blown sub come in the shop i install at for replacement...it was because he only had one coil wired up. if channels 3and4 can be bridged to 2ohms...then do it. wire the two voice coils in paralell and that will give u a 2ohm load.

-------------

Posted By: DYohn
Date Posted: September 01, 2003 at 7:53 AM

Powering only one coil of a DVC sub will not by itself damage a speaker. It will change the output capability by about -3db and some of the T/S parameters so that enclosure calculations are not 100% accurate, but in the situation given for this question, that will not matter as the amplifier is far below the rated power capability of the sub.

The amp listed in the original question CANNOT be bridged into 2 ohms.

The only other option would be to wire both voice coils in series and present an 8 ohm load to the bridged amplifier.

Posted By: bberman1
Date Posted: September 01, 2003 at 10:09 AM

https://www.jlaudio.com/tutorials/dvc/howWired.html

Posted By: Lebult
Date Posted: September 01, 2003 at 5:38 PM

(This is from the link bberman1 just posted, for those lazy ppl ;) )

With only one coil hooked up, a dual voice coil speaker will suffer a loss in reference efficiency of about 3dB (only half the coil windings are being energized) as well as a significant shift in its Thiele/Small parameters. This renders any enclosure calculations inaccurate unless you remeasure the speakers parameters with only one coil hooked up. Failure to account for the different parameters of a dual voice coil speaker with only one coil powered can result in very poor performance.
posted_image

I guess its possible to hook one up, but you lose a lot of performance.
Just like, you're not gonna keep putting expensive synthetic oil in your car, if it burns/leaks oil.