saw a good deal on a single 10" Sony XS-L1035D4 sub and ordered it; brain finally engaged and now i wonder if it is inappropriate for my application, using a 75x4 +180x1 alpine amp. for that 180 watts single channel, have i made a mistake in buying a dual 4-ohm voice coil?

i'm not into huge pounding in my sounds and bought the sub for $59. will the dual coils be a problem, or what should i consider. it will go in a .75 sealed enclosure.

thanks in advance,

neil

 

With the dual 4ohm coils, you can wire the sub to be either 8ohms or 2ohms. You need to find out whether or not your sub channel will handle 2ohms. If it does, wire the sub to be a 2ohm load. 8ohms is going to yield less output from your amp.

If you have questions on how to wire the sub to be different ohms, go out to www.jlaudio.com and look through the tutorials.

 

Can't you set that amp to be 150X2? Then you hook up one channel to one 8 ohm coil and one to the other. The point of dual voice coils isn't to offer alternative ohms (although it does) the point is to allow one to run a stereo signal that normally would require two separate speakers to only one speaker. For the low notes this is a good way to achive rich bass while only giving up space for one speaker and therefor only one enclousure.

 

Not really. The dual coils originally were for that purpose. That was when amps were hard to mono. Now they are used to change ohm levels so the amp can be mono'ed. For best sound and output on bass you really do want to mono the amp. For example I am running 2 12" Cerwin Vega HED's dual voice coil. Each sub is set to 8ohm then wired in paralell to create a single 4ohm channel which my fosgate 500.2 the drives. With todays subs using 'common air' boxes especially if you are using a dual voice coil the only way to go is mono.

 

but fellas, i want to keep my four channels and was just wondering if, since i got a very good deal on the sub, i can still use it to good effect employing the 180w single channel.

neil

 

First see if the amp will hold a 2ohm load. If so you are golden. If not then just use a single coil, ie only use one set of terminals. What is the model number on that alpine

 

Alpine MRP-F320. Good deal on it right now @ onlinecarstereo.com--$189.

neil

 

This is only heresay from several car audio boards, but it has been stated that running only one coil on a dvc sub is bad for the sub. I do not remeber why, but I thought that I'd bring it up. As stated though, if your sub channel is stable at 2 ohms, you're set.

 

yes--the literature backs you up on not wiring just one half of it up.

i wish i could figure out if the alpine is stable @ 2ohms. the literature doesn't say. in fact, the alpine literature that came with the amp is minimal.

 

Give Alpine a call/email. They can answer your question. Or, you could call a local shop that sells Alpine and ask them. Good luck

 

First off, it is a bad idea to run just one set of coils, you will more than likely hurt the sub and or amp. Second, most amps worth their salt can be driven at 2 ohms, they may not claim it, but they will do it. If they say that it is "2 Ohms Stable" then somebody will say..."oh, it must be able to handle a 1 Ohm load", therefore causing more spent amps and or subs. Wire it at 2 and if you do not over drive it, it should be fine. Besides, thatis what is a warranty for. And finally, if you measure the impedence of a voice coil just sitting there , it will read totally different than it will when you hook juice to it. So 2 ohms is not always 2 ohms. Isn't car audio fun!!!

 

12V is right. The speaker may read a given ohm when not playing music, but will read different ohm loads with music. For example, your sub may be wired as a 2ohm load, but that load may not be presented to the amp while playing music. It will usually, with music, be higher.
I agree with 12V. Wire it up to be 2ohms and give it a go.