Questions about Subs
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=29923
Printed Date: July 17, 2025 at 2:37 PM
Topic: Questions about Subs
Posted By: TheMadScientist
Subject: Questions about Subs
Date Posted: April 07, 2004 at 8:29 PM
Hey,
I know that the brands that I am about to mention are not very good,but I am doing what I can with what I got. I have a Legacy LA2080 and (3) Jensen XS1212 12inch subs. I was needing info on the best way to wire these subs to this amp to get the right watts. Thanks ahead of time for your help.
Replies:
Posted By: Alpine Guy
Date Posted: April 07, 2004 at 9:15 PM
What impedance are the voice coils 2ohm or 4 ohm, , and are they dual voice coils, or single. Plus, is your Amp a mono amp, 2 channel, or 4 channel. What impendance loads does it say it can handle? We need all that info first please. ------------- 2003 Chevy Avalanche,Eclipse CD7000,Morel Elate 5,Adire Extremis,Alpine PDX-4.150, 15" TC-3000, 2 Alpine PDX-1.1000, 470Amp HO Alt.
Posted By: stevdart
Date Posted: April 07, 2004 at 9:34 PM
The subs are rated at 125 wrms each. The amp is 2 channel with a bridged rating of 1200 watts X 1. All ratings aside, the only way I can see wiring those subs is to series them to each other. They are SVC, 4 ohms (by what I could find out.) Connect the 3 subs in series for a 12 ohm total load. Then bridge (yes, the amp is bridgeable) the box to the amp for a 6 ohm load. You should get all the power needed for the subs.
Posted By: TheMadScientist
Date Posted: April 07, 2004 at 10:44 PM
How do I wire them exactly? I'm new at this stuff and I really don't know alot about wiring diagrams and stuff like that.
Posted By: TheMadScientist
Date Posted: April 07, 2004 at 10:51 PM
The amp is rated at 2x200W RMS at 4ohms or 2x320W RMS at 2 ohms. That is about all I know about the amp. The subs are 4 ohm. They say that they can handle 175 RMS.
Posted By: stevdart
Date Posted: April 07, 2004 at 11:01 PM
Posted By: TheMadScientist
Date Posted: April 07, 2004 at 11:07 PM
Yeah, that is my amp.
Posted By: TheMadScientist
Date Posted: April 07, 2004 at 11:27 PM
So how do I hook the subs up in series? I'm already gathering stuff to make the box. How many speaker terminals do I need for the outside of the box? one or three?
Posted By: stevdart
Date Posted: April 07, 2004 at 11:29 PM
To use the three subs, they have to be wired together first before connecting to the amp. There are some good diagrams on the web of series wiring, but in essence it's like this: the three speakers are arranged in a proper enclosure (the manufacturer will supply you with this info. They are wired together in series. The first speaker + goes to the box terminal +. The - of that speaker connects to speaker 2, on the +. The - of that speaker connects to speaker 3 on the +. The - of speaker 3 connects to the box terminal marked -. Here is some good info to read: https://www.bcae1.com/srsparll.htm The box of three speakers is now rated at 12 ohms ( 4+4+4). Bridge it to the amp. The manual should show a diagram for that, but it is the + wire to left channel +, and the - wire to the right channel -. This becomes a 6 ohm mono load. You can also use separate boxes. The wiring remains the same as described here. There is some excellent info in the site I referred. Check it out for some good basic knowledge.
Posted By: stevdart
Date Posted: April 07, 2004 at 11:35 PM
I got that mono load rating wrong. It is a 12 ohm mono load which is equivalent to a 6 ohm stereo load. The reason you wire it like this is because the amp won't be able to handle the current demands of three woofers wired in any other way.
Posted By: TheMadScientist
Date Posted: April 07, 2004 at 11:36 PM
Alright thanks man, in this wiring diagram that you described how much watts will each sub be getting?
Posted By: stevdart
Date Posted: April 07, 2004 at 11:45 PM
I have seen three different ratings for this amp so I don't know what it really outputs. But by your info, each sub would get enough power to produce 100 watts.
Posted By: TheMadScientist
Date Posted: April 07, 2004 at 11:49 PM
Well would it be easier for me to get another sub and just put 2 subs on each channel? because the amp can run 2x350 RMS at 2ohms is there anyway that I can wire two subs together to make it two ohms so I can get 350 going to two subs which that would equal out to 175 a piece which is perfect for the subs? is there anyway to do that though?
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