Dual Voice Coil Rockford Fosgate 10" HE2 is the subwoofer 400rms 800peak watts.

 

i don't get what your question is here...

 

Well, you can't get 2 ohm stereo or 2 ohm mono out of one sub. If the VC's are 4 ohm, you'll get 4 ohm stereo or 2 or 8 ohm mono. If the VC's are 2 ohm, you'll get 2 ohm mono or 1 or 4 ohm mono. No other options.

What amp are you running?

 

If you are putting the same amount of watts through a sub in 2ohm stereo will it sound just as loud and clean as it would sound in 2ohm mono. As for a DVC 4ohm sub. The sub san be wired into 2ohms if it is run in parallel and can also be run in 8ohms if it is run in series. I am asking because I recently bought a Dual 4ohm voice coil sub. I was planning on wiring it into parallel into 2ohms and am wondering if wiring into two ohms mono is better than running it at 2ohm stereo.

 

If you have a dual 4 ohm sub it will be impossible to run it at 2 ohms in stereo. I.E....If you have a 2 channel amp...to run it in stereo you will hook up the left channel to one V.C. and the right channel to the other V.C. You have not changed the impedence that the amplifier sees, so you would be running a 4 ohm stereo config.

To run them in parallel...you connect both of the positive leads and both of the negatives together on the V.C.'s, this is what changes the amplifier load to 2 ohms. Now if you have a 2 channel amp that can run a 2 ohm mono load, you'll take the + of one channel and the - of the other channel and connect them to the speaker leads. The wiring of the speakers is what makes it 2 ohms and the mono has to do with what the amp is capable of, as not all amps can run a 2 ohm mono load.

As far a which sounds better, well that depends if your amp can handle a 2 ohm mono load. If not then there is no debate and you'll run it in stereo. But, if your amp can, then a 2 ohm mono load will produce more power than a the 4 ohm stereo load. As for which sounds better, that's up to you. Try both ways and see what you like...it only take a second to switch it.

Personally, I run the amp for my sub in mono...hop ethis helps.

 

*nods*


well, you cannot run a 4 ohm DVC sub in 2 ohm stereo mode. based on what i'm understanding of what you want to do, it just cannot be done.

you would either have to wire it as a 4 ohm stereo load (each coil going to 1 channel of the amp) or as a 2 ohm or 8 ohm mono load.
using the same amp, if you run it at a 4 ohm stereo load, you'll get the equivalent output power wise from the amp and volume wise from the sub, as if you had it running in an 8 ohm series configuration w/ the amp bridged mono. if you run it in a 2 ohm mono bridged configuration, assuming the amp is not current limited, you'll get roughly 4 times the power and an audible increase in the volume.

there was some info about this on those pages i linked you to... it was deep in there, but it was there.

essentially, here's how it works. these are very general rules and make some assumptions about the amps not being current limited and about the amps not having efficiency losses... and it assumes that the amps are stable at these impedences.

• if you cut the speaker impedence in half, the power doubles. (an amp producing 50 Wrms @ 4ohms will produce 100 Wrms @ 2ohms)
  
• likewise, if you double the speaker impedence, the power deliverd is cut in half.
  
• if you bridge a stereo amp from 2 channels to 1 the output voltage supplied doubles, and according to P=(V^2)/R, the power increases by 4. (50 Wrms x 2 @ 4 ohms = 200 Wrms x 1 @ 4 ohms)
  
• a amp will be mono stable at 2 times the impedence it is stereo stable. (a 2 ohm stereo stable amp will be 4 ohm mono stable. a 1 ohm stereo stable amp will be 2 ohm mono stable.)

now, to list out combinations of possible wiring options for subs (single voice coil = SVC, dual voice coil = DVC, and a 4 ohm DVC sub has 2 4 ohm coils.):

• 4 ohm SVC = 4 ohm total load.
  
• 2 ohm SVC = 2 ohm total load.
  
• 4 ohm DVC = can be wired in parallel for a 2 ohm total load. can be wired in series for a 8 ohm total load.
  
• 2 ohm DVC = can be wired in parallel for a 1 ohm total load. can be wired in series for a 4 ohm total load.
  
• 3 ohm DVC = can be wired in parallel for a 1.5 ohm total load. can be wired in series for a 6 ohm total load.
  
• 6 ohm DVC = can be wired in parallel for a 3 ohm total load. can be wired in series for a 12 ohm total load.

hope this helps.

 

Why does it seem as though Pjk always come to save the day with me? You are the man. So patient and a great guy so here comes some Karma at ya!
Pj I read the posts you linked me to. They get very technical. I am not a very technical guy, but I am trying! I guess I will be running my RFP4210 in a 2ohm mono load depending on which amp I decide on. (You know which ones) I think that they are all 2ohm stable in mono.

 

yeah, i know those pages get really technical. it probably scares people away a bit... but even if you just skim the higher level technical stuff, his points are pretty basic. i guessed you probably had a bit of confusion from his presentation. either or... let me see if i can find some sub wiring guides that aren't so complex.

try this:

http://www.jlaudio.com/tutorials/wiring/index.html
and
http://www.jlaudio.com/tutorials/dvc/index.html

and i agree -- i do think all of them are 2 ohm stable in mono, but i'm not sure if they all double power (or even increase at all) when going from 4 ohm mono to 2 ohm mono.


edit:
in all honesty, a real problem for me sometimes is that w/ my math and engineering degrees -- for me, math forumlas and calculations often read more clearly than written words. so, i struggle in remembering that for some people - the moment they see a formula, they get lost...