2 ohm or 4 ohm please help!!??!?!

[954pilot 10+ year member]

hahaha... yah im getting 2 subs, and they are going to be d4's... the 1 ohm, 4 ohm sounds better for sure... now with that could i make the 2 subs run off a 2 ohm amp briged??

and for those amps you showed me how would i want to wire these up?

like since the MTX is 125x2 @ 4 ohm, so would it be 250x2 @ 2ohm?

 

[squeak9798 5,000+ posts]

hahaha... yah im getting 2 subs, and they are going to be d4's... the 1 ohm, 4 ohm sounds better for sure... now with that could i make the 2 subs run off a 2 ohm amp briged??

What do you mean by a 2ohm amp? With 2 D4's, you can run them at either 1ohm or 4ohm....so find an amp that makes the power you need into either of those loads. Or, you can wire each individual sub into a single 2ohm load to run off a 2-channel amp at 2ohms per channel, if that's what you were asking.

and for those amps you showed me how would i want to wire these up?

http://www.rockfordfosgate.com/rftech/wiringwizard.asp?WoofQty=2+woofers&WoofImp=Dual+Voice+Coil+-+4+ohms+x+2&image.x=12&image.y=8&image=Submit

http://www.rockfordfosgate.com/rftech/wiringwizard.asp?WoofQty=1+woofer&WoofImp=Dual+Voice+Coil+-+4+ohms+x+2&image.x=12&image.y=13&image=Submit

Either way depending on which impedence you want.

like since the MTX is 125x2 @ 4 ohm, so would it be 250x2 @ 2ohm?

Should be around there.

 

[JoseMCeee 10+ year member]

yea i think thats what he means. Lets say that MTX amp, u can wire each one independantly to 2 ohms and connect to each channel which will be 250 x 2 @ 2 ohm stereo. OR you can wire them up together for a final of 4 ohms and connect it to the amp bridged for 500 x 1 @ 4 ohm mono. Im still not sure of the difference between mono and stereo in this situation tho. Same power output.

 

[954pilot 10+ year member]

ok cool.. now let me see if im getting this 100%.

if i bridge a 2 ohm 2 channel amp it makes it 4 ohm mono, right?

would it being stereo make it sound better?

ok... would it be beneficial to run a amp thats bridged to 500x1 @ 4 ohms, or just get a 250x2 @ 4 ohms??

either or, dual 2s you could wire at 1 or 4, dual 4's at 2 or 8...the dual 2's would be more versatile, but i would do dual 4's and wire it at 2

What he said was correct; A dual 2ohm/coil sub can be wired at 1ohm or 4ohm, and a dual 4ohm/coil sub can be wired to 2ohm or 8ohm. The D2 version would be a little more "versatile", since wiring a sub to 8ohm is pretty worthless most of the time.

so if you have 2 subs that are DVC 4 ohm it can be 1 or 4 ohm, and if you only run 1 dvc 4 ohm sub it can be run at 2 or 8 ohm... correct? so the amount fo sbs changes the resistance.

**** this is complicated

 

[JoseMCeee 10+ year member]

ok cool.. now let me see if im getting this 100%.
if i bridge a 2 ohm 2 channel amp it makes it 4 ohm mono, right?

would it being stereo make it sound better?

ok... would it be beneficial to run a amp thats bridged to 500x1 @ 4 ohms, or just get a 250x2 @ 4 ohms??

so if you have 2 subs that are DVC 4 ohm it can be 1 or 4 ohm, and if you only run 1 dvc 4 ohm sub it can be run at 2 or 8 ohm... correct? so the amount fo sbs changes the resistance.

**** this is complicated

correction its 500 X 1 @ 4 ohms and 250 x 2 @ 2 ohms. Im not sure what the difference is between stereo and mono but I doubt you will hear it with the subs. I think if they were some regular speakers you could hear the difference. For shts and giggles just wire it at 250 x 2 @ 2 ohms for stereo and less complications.

 

[squeak9798 5,000+ posts]

if i bridge a 2 ohm 2 channel amp it makes it 4 ohm mono, right?

Just some technicalities that may sound stupid, but really change the whole meaning.......

The amp doesn't have an impedance (for our purposes). There is no 2ohm amp. Using that term is really just, well, wrong. The amp is stable to a 2ohm load per channel. It's the speakers (or subs) that determine what impedance the amplifier is actually driving. And an amp that is stable into a 2ohm load per channel is only only stable into a 4ohm load bridged (think of it as each channel essentially "seeing" half the load when bridged, so a 4ohm load on a bridged amp makes each channel "see" a 2ohm load). Anything lower than those impedances (2ohm per channel, or 4ohm bridged) and you risk damaging the amp.

So, bridging an amp that is stable down to 2ohm per channel doesn't automatically make it 4ohms. But an amp that is only stable to 2ohm per channel will only be stable into a 4ohm load bridged. You can wire a 2ohm load to the amplifier bridged......but you run a very high risk of damaging the amp, and hence it is not recommended //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

would it being stereo make it sound better?

Can't hear subbass in stereo, which is why mono amps work and why many people get away with only have a single sub.

ok... would it be beneficial to run a amp thats bridged to 500x1 @ 4 ohms, or just get a 250x2 @ 4 ohms??

Essentially the same thing. And it would be 250w x 2 @ 2ohm

so if you have 2 subs that are DVC 4 ohm it can be 1 or 4 ohm, and if you only run 1 dvc 4 ohm sub it can be run at 2 or 8 ohm... correct? so the amount fo sbs changes the resistance.

Yes, that is correct. But no, the subs aren't really "changing" impedances. The only subs that can be wired into different impedances are dual voice coil or quad coil subs. With dual voice coils, you can wire the coils in series or in parallel to arrive at different impedances. This can only be done with speakers that have more than one voice coil. So, they aren't really "changing", it just gives you more wiring options for flexibility (opens up your amplifier options by being able to wire the sub(s) to different impedances)

 

[JoseMCeee 10+ year member]

^dam Squeak served you up wit some knowledge right there.