Wireing up a DVC sub
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=76266
Printed Date: May 15, 2024 at 7:40 PM
Topic: Wireing up a DVC sub
Posted By: homerb
Subject: Wireing up a DVC sub
Date Posted: April 15, 2006 at 9:59 AM
Hay guys I wuld like to know the correct way 2 wire up a sub with 4 ohm dual voice coils. The sub is a MA Audio MA100XE 10" 300W RMS @ 4 ohms sub with 4 ohms DVC. It is 2 b connected to a Earthquake Powerhouse 2.3 2 channel amp that puts out 300 W RMS @ 4 ohms mono. I want 2 connect the sub to the amp in series/parallel so its impidence stays 4 ohms. I'm a little confused with the wireing diagram. I connect 1 of the 2 +ive/-ive terminals to the +ve and -ive in the amp but what about the other set of terminals?? should they be connected +ve to -ive ot each other or to the 1st terminal that is connected to the amp? Could you please tell me which of the 2 diagrams below is correct. Thanx 4 the help.
Replies:
Posted By: DYohn
Date Posted: April 15, 2006 at 10:34 AM
No, you cannot wire both voice coils and keep the system at 4-ohms. Your options are 2-ohms (voice coils in parallel) or 8-ohms (voice coils in series.) You can operate using only one voice coil to place a 4-ohm load on the amp, but be aware doing this will cut the speaker's power handling capability in half (in your case to 150 watts.) ------------- Support the12volt.com
Posted By: homerb
Date Posted: April 15, 2006 at 10:44 AM
so nither of the above diagrams are correct?? do you mean i hav 2 just connect 1 +ve -ve terminal 2 the amp and leave the other 1 as it is? if i run it in 2 ohms on the amp which is putting out 300W @ 4 ohms mono will that damage the sub??? can i run 2 of the above subs connected in 2 ohms on the amp?? it puts out 130W x 2 channels @ 2 ohms how exactly do i connect it to keep the impedence 2 ohms?
Posted By: homerb
Date Posted: April 15, 2006 at 11:08 AM
ok i think i'm getting it now i wire both subs like diagram '2' and connect each to 1 channel of the amp that is putting out 130W per channel at 2 ohms. if as u say the RMS rating on the sub goes down to 150W @ 2 ohms then they should both run fine on the 2 channel amp. hav i got it right???
Posted By: DYohn
Date Posted: April 15, 2006 at 11:29 AM
You have 2 subs? Why didn't you say so. Look to the left, there is an excellent woofer wiring link under "Car Audio." It tells you to wire like this and connect it in mono to the bridged outputs of your amp: 
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Posted By: homerb
Date Posted: April 15, 2006 at 11:43 AM
But if i wire it in this way wont my amp need to put out around 600W RMS @ 4 ohms to run both the subs??? i thought the power rating had 2 be added up if i wired them in combination series/parallel i.e. 2 x 300W = 600W @ 4 ohms
Posted By: geepherder
Date Posted: April 15, 2006 at 2:37 PM
I don't understand your question. You say your amp puts out 300 watts mono at 4 ohms, right? That means each sub will get 150 watts for a total of 300 watts.
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Posted By: homerb
Date Posted: April 15, 2006 at 9:52 PM
Yup ur exactly right geepherder. thats what i'm sayin too. i dont see how i can wire 2 300W @ 4 ohm subs in series/parallel like DYohn suggested when my amp only puts out 300W. as i understand things i'll need an amp that puts out close to 600W for the 2 subs. but if i wire each sub individuly in parallel (my diagram 2) then the impedence cums down to 2 ohms for each sub so as far as i can understand the RMS power requirement should half too to around 150 watts. so i should then be able to hook up both subs each to 1 channel of the 2 channel amp as it puts out 130W per channel @ 2 ohms. is that ok??
Posted By: stevdart
Date Posted: April 15, 2006 at 10:37 PM
Before more responses here, see the other open thread on this subject " How is subs RMS rating calculated? " ------------- Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.
Posted By: mr.audiophile
Date Posted: April 15, 2006 at 10:40 PM
fisrt things first. If your running a 4 ohm dvc sub. It will not operate at 4 ohms. Only 2 or 8. Yes you can wire each sub to each at 2 ohms. But if your only running 130 watts rms out of each channel and your subs are 300 watts rms, you'll wreck your subs. That will cause clipping. If your amp will run at 2 ohms bridged, you should just run 1 sub. Its better to over power your sub then under power it.
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Posted By: forbidden
Date Posted: April 15, 2006 at 11:48 PM
Yo, rook, no offence but way wrong info there dude. Go back to start, do not pass go, don't collect the prize money or the girl (I get her  ). Do some reading of the collection of stickies that we are accumulating, there is much to learn there. ------------- Top Secret, I can tell you but then my wife will kill me.
Posted By: DYohn
Date Posted: April 16, 2006 at 10:49 AM
Yes, please follow forbidden's and stevdart's advice and read the stickies, both of you. There is NOTHING wrong with using less than the RMS power rating of a sub. It will not cause clipping. Improper amplifier setup (usually too high gain setting) causes clipping. Set up your amplifier gain properly and there will be no problems. ------------- Support the12volt.com
Posted By: homerb
Date Posted: April 16, 2006 at 10:34 PM
Thanks guys. I've hooked them up the way ual suggested and theyre running fine. You ppl r da bomb. Cheers 
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