2 ohms ok?

[olivesman]

well guys, you talked me into it. i'm not gettin the pyramids. i'm going to go w/ a kenwood 728s. the diagnostics say it will go 300rms bridged at 4ohms and that it is stable at 2ohms. so, i was wondering if i pushed two 4 ohm speakers parallel while bridging and therefor knocking it down to 2 ohms if i will be ok. i would assume yes, b/c of the stable 2 ohms. thanks again for the help.

 

[mrsteve]

Usually that means 2 ohms stereo but my Rockford Fosgate amp says it is stable at 2ohms stereo but I've had it bridged at 2 ohms since October with no heating problems. You could be alright, but I'm not 100% sure. You may want to use a fan to keep the amp cool.

Steve

 

[JTang]

This one guy told me he accidentally had his RF at one ohm for like 6 months, and it kept on working. I think the RFs could handle that kind of abuse pretty easily, but the Kenwoods I'd keep at the recommended ratings.

When the Kenwood says 2 ohms, they mean in stereo. So, best to not bridge the amp, unless you get 2 or 8 ohm subs to pull more power. Either that or just get one 4 ohm sub that can handle 300 rms and then you can bridge it.

 

[olivesman]

then i don't really understand. the kac728s sais it's 2 ohms stable and it's only 2 channels. how would i then run it safely on 2 ohms? if it's just a sub amp, then i would have to run like 4 4ohm 10's(2 from each channel) for it to run on 2 ohms b/c it sais, (100x2 at 4ohms) i don't get it? how then, could i not run 2 subs while bridging it?

 

[mrsteve]

This is how you could run your amp safely:

Use 2 4 ohm speakers, wired in stereo, 1 to each channel.
Use 4 4 ohm speaerks, bridge a pair of speaerks to each channel. This way you would get a 2 ohm load on each channel.
You could bridge the amp and run it to 1 4ohm sub or to 2 8 or 2 ohm subs, bridging the subs and the amp.

Basically when you bridge the amp you are causing it to run hotter. When an amp is run at 2 ohms stereo you are causing about the same amount of stress on the amp. When you combine these two methods the amp is going to create alot of power and run much hotter.

Steve

 

[olivesman]

Originally posted by mrsteve
Use 4 4 ohm speaerks, bridge a pair of speaerks to each channel. This way you would get a 2 ohm load on each channel.
You could bridge the amp and run it to 1 4ohm sub or to 2 8 or 2 ohm subs, bridging the subs and the amp. Steve

by "bridging" the speaker, do you mean running them in parrallel? and, why would i be able to run 2 2ohm speakers while bridging the amp? wouldn't that be running it on 1 ohm?
where can i get the fans that i would need when i build my audio system?
thanks again-russel

 

[Byrd91]

olivesman,
what mrsteve meant was:

1)2 4ohm speakers, one wired to each channel

2)4 4ohm speakers, two wired parallel to each channel, this
will give you 2ohms per channel load.

3)Bridge the amp to:
a) 1 4ohm speaker
b) 2 8ohm speakers wired in parallel
c) 2 2ohm speakers wired in series

 

[olivesman]

that explains, thanks a lot-russel

 

[mrsteve]

Yeah sorry now that I re-read my post it was a little confusing.

Steve