Help on wiring

[biiqdanz 10+ year member]

Ok... i have a rockford 700's with two 12 inch mtx thunder 8000's dual 4 ohm subs. Now both subs came with a paper on how to wire the subs. But as of now im not using the other 2 coils. Im just using two on each sub so im doing a single voice coil wiring.

Theres an option to wire 2 subs.

It says

With speakers wired in parallel:

Two 4 ohm speakers will present a 2 ohm load----- thats what i did but it isnt working i dont know why any help?

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[qtipextra 5,000+ posts]

First off, u absoulutley need to use both voice coils on the sub, no exceptions! And then wire one sub's voice coil in parallel to get a 2 ohm load, wire your other sub the same way to get a 2 ohm load, then wire the subs either in parallel to = 1 ohm, or in series to = 4 ohms,

OR

Wire one subs coils in series to be an 8 ohm load, wire the other sub the same way, and wire the 2 subs in parallel to = 4 ohms, or wire the 2 subs in series and get 16 ohms.

Those are all possibe outcomes with two dual 4 ohm voice coil subs.

I hope that helps !

 

[qtipextra 5,000+ posts]

The subs will work with one coil, but it is not good for them as far as i know, unless it says specifically that it is ok,

And another suggestion, the way you have it, single parallel to single will = 2 ohm, so check and make sure your amp is stable at that low of an ohm load.

 

[biiqdanz 10+ year member]

Ok... i have a rockford 700's with two 12 inch mtx thunder 8000's dual 4 ohm subs. Now both subs came with a paper on how to wire the subs. But as of now im not using the other 2 coils. Im just using two on each sub so im doing a single voice coil wiring.
Theres an option to wire 2 subs.

It says

With speakers wired in parallel:

Two 4 ohm speakers will present a 2 ohm load----- thats what i did but it isnt working i dont know why any help?

Well wut i did was ok im gonna be specific lol. My connection was normal from the amp to the back of the box. then i took the subs out i cut 4 wires that were in my garage and i turned one sub around and i put a wire that went from positive to the other positive on the other side of the sub and i did the same thing with negative and i did that exactly to the other sub. So that presents a 2 ohm load with the rockford 700's //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

 

[biiqdanz 10+ year member]

The subs will work with one coil, but it is not good for them as far as i know, unless it says specifically that it is ok,
And another suggestion, the way you have it, single parallel to single will = 2 ohm, so check and make sure your amp is stable at that low of an ohm load.

Well the paper that came with them, has single voice coil wirings and on the back of the sheet it has dvc wiring so i assume it works. I just didnt wanna push it that hard. because this setup i have now makes my radio skip but ill deal with it lol because its the stock one so i have to deal with the skip of the cd due to the bass. Thats why i wanted to keep it parrellel 4 ohm load presents a 2 ohm load but on the paper it showed it differently then how someone showed me it here. I guess its because the amp didnt recognize it i dunno. But the amps specs are 175 with 4 ohm load 350 on a 2 ohm load- thats the one i have and 700x1 on 4ohm Load bridged (mono). So if that helps did i do it right? I checked it and it worked good but i wanna make sure the amp doesnt blow in time?

 

[req 5,000+ posts]

Ok... i have a rockford 700's with two 12 inch mtx thunder 8000's dual 4 ohm subs.

for future refrence-

http://www.rockfordfosgate.com/rftech/wiringwizard.asp

your amp specs;

Rockford Fosgate 700S

* Amplifier Type: 2-channel

* RMS Power: 175W x 2 @ 4ohms per channel

* RMS Power: 350W x 2 @ 2ohms per channel

***Bridged RMS Power: 700W x 1 @4ohm bridged MINIMUM***

* THD at Rated RMS Power:

* Speaker Level Inputs: Yes

* Preamp Outputs: No

* Built-In Crossovers: HP/LP

* Bass Boost: 0 - 18 dB

* Frequency Response: 20-20,000 Hz

* Channel Separation: 65 dB

* Signal to Noise Ratio: >100 dB

* Fuse Rating: 60 amps

your user manual *print this out for future refrence if you dont have it*;

http://www.rockfordfosgate.com/scripts/rightnow.cfg/php.exe/enduser/fattach_get.php?p_sid=J2yKfsth&p_tbl=9&p_id=278&p_created=1083252061

so here is how you hook it up if you bridge @4ohms;

but you can also wire the DVC4 coils each to 2 ohm like so and hook them to each channel - both ways *should* get 700w, but who knows how much that amp is overrated - this is how I would do it... just incase one woofer decides to break, the other will be wired by itself and there will be zero problems if one goes;

good luck //content.invisioncic.com/y282845/emoticons/thumbsupwink.gif.129404938effda6ad9cca39e7f4b58a3.gif

 

[qtipextra 5,000+ posts]

your amp specs;

Rockford Fosgate 700S

* Amplifier Type: 2-channel

* RMS Power: 175W x 2 @ 4ohms per channel

* RMS Power: 350W x 2 @ 2ohms per channel

***Bridged RMS Power: 700W x 1 @4ohm bridged MINIMUM***

* THD at Rated RMS Power:

* Speaker Level Inputs: Yes

* Preamp Outputs: No

* Built-In Crossovers: HP/LP

* Bass Boost: 0 - 18 dB

* Frequency Response: 20-20,000 Hz

* Channel Separation: 65 dB

* Signal to Noise Ratio: >100 dB

* Fuse Rating: 60 amps

So your amp bridged will only take a 4 ohm load or higher. So that is your problem, too low impedence. use both coils, get it to equal 4 ohms total, and then run bridge your amp, no problem.

 

[biiqdanz 10+ year member]

for future refrence-
http://www.rockfordfosgate.com/rftech/wiringwizard.asp

your amp specs;

Rockford Fosgate 700S

* Amplifier Type: 2-channel

* RMS Power: 175W x 2 @ 4ohms per channel

* RMS Power: 350W x 2 @ 2ohms per channel

***Bridged RMS Power: 700W x 1 @4ohm bridged MINIMUM***

* THD at Rated RMS Power:

* Speaker Level Inputs: Yes

* Preamp Outputs: No

* Built-In Crossovers: HP/LP

* Bass Boost: 0 - 18 dB

* Frequency Response: 20-20,000 Hz

* Channel Separation: 65 dB

* Signal to Noise Ratio: >100 dB

* Fuse Rating: 60 amps

your user manual *print this out for future refrence if you dont have it*;

http://www.rockfordfosgate.com/scripts/rightnow.cfg/php.exe/enduser/fattach_get.php?p_sid=J2yKfsth&p_tbl=9&p_id=278&p_created=1083252061

so here is how you hook it up if you bridge @4ohms;

but you can also wire the DVC4 coils each to 2 ohm like so and hook them to each channel - both ways *should* get 700w, but who knows how much that amp is overrated - this is how I would do it... just incase one woofer decides to break, the other will be wired by itself and there will be zero problems if one goes;

good luck //content.invisioncic.com/y282845/emoticons/thumbsupwink.gif.129404938effda6ad9cca39e7f4b58a3.gif

So the way i set it up was wrong or can cause the amp to blow?

 

[biiqdanz 10+ year member]

So your amp bridged will only take a 4 ohm load or higher. So that is your problem, too low impedence. use both coils, get it to equal 4 ohms total, and then run bridge your amp, no problem.

Originally Posted by bonesninja

http://www.jlaudio.com/tutorials/wiring/ scroll down to the second diagram the one that says 1 dvc driver with voice coils in parallel. do each sub like that then connect one sub per channel.

Go there.. thats how i wired the 2