sub wiring

[ollyc98]

If all 3 subs are 4 ohms and my amplifier was set to bridged and speakers were wired as below what would the resistance be as far as the amplifier is concerned?

Thanks

 

[mikey]

Try this mate, easier than me tryin' to explain...or understand lol

http://www.the12volt.com/caraudio/woofer_configurations.asp?Q=3&I=41

 

[ollyc98]

I know about those wiring diagrams, I just can't work out this one. I guess I'll have to wire it up and see if the amp cuts out.

 

[capnmchl]

It would be much easier with 4 speakers. Wire 2 parallel loops of 2 speakers in series. With 3 though, it starts getting complicated. Considering speakers work on AC, it gets even more confusing when you're not using the same power rails.

Taking a stab in the dark, I would like to say 3ohm's, but I dunno if that's right.

 

[mike]

Short answer is you will either fry the subs, blow the amp or both.

Long answer
You are not balancing the load on the positive and negative channels, as such you will be showing 4 ohms and 2 ohms. If the protection circuit doesn't kick in and this mysteriously works then over time you will fry the amp.

As two of the subs (left and right ones) will see uneven load you will most properly burn out the coil, as one side will be receiving more power than the other side of the coil. The other sub will be fed a 2 ohm load to both sides of the coil and will most properly fry as well if it cannot take it.

Mike

 

[ollyc98]

Alright fair enough, I'll just get one more sub and balance it out

 

[Alexx117]

12 ohms in series, 1.3 ohms in parallel i think.

 

[superls]

id assume that both -'s are connected, so the left channel (as viewed from the pic) would see 2 ohms, and the right channel would see 4 ohms.

 

[superls]

if you had 4 subs that could work,

 

[ollyc98]

I think a 1 ohm stable monoblock amp is in order.... then I can wire them all in parallel.

The only reason I thought 3 subs would work is the amp has a bridged mode (where the middle sub is connnected to) then the other 2 subs are connected in the usual stereo way

 

[superls]

usually an amp is either brigdes or stereo, not both. like you say get a dedicated mono amp and wire them in parallel or as the link above suggests wire them in series and use the bridged output.

 

[ollyc98]

When in bridged mode it puts the left channel out of phase to effectively double the output. It's technically still in stereo just with one channel 'pulling' whilst the right channel 'pushes' as normal.


I think....

 

[Retepetsir]

When in bridged mode it puts the left channel out of phase to effectively double the output. It's technically still in stereo just with one channel 'pulling' whilst the right channel 'pushes' as normal.


I think....

No, just don't do it.

Stick to 2 subs, you won't need 4 and you wouldn't have enough boot space for the correct box volume anyway.

I assume its a 2-channel amp, stable down to 2ohms stereo or 4ohms bridged?

Just wire one sub to each channel, although you won't be maximising its capability.

 

[ollyc98]

They were gunna be 8 inch subs so plenty of boot space, never mind, I've decided to go a different way with my car anyway