Subs & Ohms question
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=48541
Printed Date: May 08, 2024 at 8:32 AM
Topic: Subs & Ohms question
Posted By: Jondamage
Subject: Subs & Ohms question
Date Posted: January 25, 2005 at 3:59 AM
Hiya's
I'm gonna be doing an install in a 2004 Dakota.
The system I have is all Alpine..
CDA-9827 Head Unit
4 SPS-170A 6-1/2" Coaxials (already installed)
2 SWS-1041 10" 4 Ohm subs
1 MRV-F450 5/channel amp
The 5th channel on the amp is for the subs and has an output of 4 ohms.
My Question is. How should I wire the subs?
I'm thinking to wire them in series, but I'm finding this ohm stuff a bit confusing just want some opinions.
Thanx in advance,
Jon
Replies:
Posted By: wheelerdr
Date Posted: January 25, 2005 at 4:30 AM
I think those are single voice coils right that gives you 3 choices run both in parallel which will give you 2 ohms, that is wiring both + to the + ont that ch, and both - to the - on that ch. or wire them in series which will give you 8 ohms it seems you know how to wire this one or to get your 4 ohm only run one sub.
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Posted By: Jondamage
Date Posted: January 25, 2005 at 4:51 AM
Thnx for the reply Wheelerdr, most sites just want too sell me the things. can't find out if they are SVC's atm. Single sub is not an option, I payed for em both LOL
will a 4 ohm output sustain a 8 ohm load on a series configuration? hehehe
Posted By: Jondamage
Date Posted: January 25, 2005 at 5:24 AM
if I wire the subs in series that will add up to 8 ohms.
when I connect my amp output of 4 ohms will that drop the dual subs to 4 ohms as well and hold what wattage per sub?
Posted By: stevdart
Date Posted: January 25, 2005 at 5:41 AM
Subs model 1041 are single voice coil, 4 ohm impedance each. The amp has these specs: RMS Power (at 14.4V,20Hz-200Hz) Bridged 4 ohms : 120W x 2 + 200W x 1
Per channel into 2 ohms : 60W x 4 + 200W x 1
Per channel into 4 ohms : 50W x 4 + 200W x 1 This type of amp outputs the same power into either 4 or 2 ohm on the 5th channel. You see that the subs can be connected together to create a 2 ohm load, and connected to the 5th channel for an output of 200 watts with engine running full throttle. Look at the "into 4 ohms" rating for the coaxials, but look at the "into 2 ohms" rating for the subs. Wire like this 
Each channel will output power at ohm loads down to and including 2 ohms. You will have one speaker on each of the first four channels, and 2 subs sharing the 5th channel......and you see that more power is outputted through the 5th channel. You won't rock the foundations of your neighbor's houses, but you should get up to 200 watts split between the two subs. (The sub wiring is "parallel").
Posted By: Jondamage
Date Posted: January 25, 2005 at 5:55 AM
thnx stevdart for your reply,
I don't want to rock the foundations of my neighbor's, just want a full sound in my truck. hehe
So you are saying I should run the subs in Parellel? to get the 2ohm load?
Posted By: Jondamage
Date Posted: January 25, 2005 at 6:26 AM
I just want to know if running dual 4 ohm subs which is equal to 8 ohms in series will give me the 4 ohms out of the amp that I require. ([:)
Posted By: DYohn
Date Posted: January 25, 2005 at 8:30 AM
Your Alpine needs at least a 4-ohm load on the fifth channel. So in your case, the wiring given above is not the best solution, You should wire the SVC 4-ohm subs at 8-ohms (in series) for the fifth channel. You will get 100 watts out of the amp into 8-ohms. Or use one sub at 4-ohms, which will give you 200 watts. Either way is fine and these are your only options with this gear. ------------- Support the12volt.com
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