Another ? on bridging...
Thread Starter
6th Gear Member
Joined: May 2005
Posts: 5,736
From: MD/WV
Another ? on bridging...
I'm alittle confused on this so hopefully you guys can clear it up. Ok, if you bridge then you cut your Ohm in half right? 2 8's bridged equal 4Ohm and 2 4's equal 2Ohm, or even 2 2's equal 1Ohm...It seems that most speakers are 4 ohm...
First off, what is an Ohm? That may help alittle...
But the main question is that it seems most amps can only handle a total of 4 ohms...So you would need to bridge 2 8's...But then why do they make so many 4's? I had a Pioneer 760 and it said if I wanted bridged, to use 8's. I now have a Phoenix Gold 800(4ch) and although there is little said in the instruction packet thing, I think it says do not bridge to create lower than 4. These arent top of the line amps but they arent cheap either. Shouldn't they be able to handle 2 4's bridged or am I reading this wrong. I recently bought 2 10" subs and they a 4 ohm, so I dont want to break my amp but it would save some channel space if I could bridge it. Help!
First off, what is an Ohm? That may help alittle...
But the main question is that it seems most amps can only handle a total of 4 ohms...So you would need to bridge 2 8's...But then why do they make so many 4's? I had a Pioneer 760 and it said if I wanted bridged, to use 8's. I now have a Phoenix Gold 800(4ch) and although there is little said in the instruction packet thing, I think it says do not bridge to create lower than 4. These arent top of the line amps but they arent cheap either. Shouldn't they be able to handle 2 4's bridged or am I reading this wrong. I recently bought 2 10" subs and they a 4 ohm, so I dont want to break my amp but it would save some channel space if I could bridge it. Help!
Gentleman's Relish
Joined: Feb 2005
Posts: 13,188
From: AZ
RE: Another ? on bridging...
ORIGINAL: baddog671
I'm alittle confused on this so hopefully you guys can clear it up. Ok, if you bridge then you cut your Ohm in half right? 2 8's bridged equal 4Ohm and 2 4's equal 2Ohm, or even 2 2's equal 1Ohm...It seems that most speakers are 4 ohm...
First off, what is an Ohm? That may help alittle...
But the main question is that it seems most amps can only handle a total of 4 ohms...So you would need to bridge 2 8's...But then why do they make so many 4's? I had a Pioneer 760 and it said if I wanted bridged, to use 8's. I now have a Phoenix Gold 800(4ch) and although there is little said in the instruction packet thing, I think it says do not bridge to create lower than 4. These arent top of the line amps but they arent cheap either. Shouldn't they be able to handle 2 4's bridged or am I reading this wrong. I recently bought 2 10" subs and they a 4 ohm, so I dont want to break my amp but it would save some channel space if I could bridge it. Help!
I'm alittle confused on this so hopefully you guys can clear it up. Ok, if you bridge then you cut your Ohm in half right? 2 8's bridged equal 4Ohm and 2 4's equal 2Ohm, or even 2 2's equal 1Ohm...It seems that most speakers are 4 ohm...
First off, what is an Ohm? That may help alittle...
But the main question is that it seems most amps can only handle a total of 4 ohms...So you would need to bridge 2 8's...But then why do they make so many 4's? I had a Pioneer 760 and it said if I wanted bridged, to use 8's. I now have a Phoenix Gold 800(4ch) and although there is little said in the instruction packet thing, I think it says do not bridge to create lower than 4. These arent top of the line amps but they arent cheap either. Shouldn't they be able to handle 2 4's bridged or am I reading this wrong. I recently bought 2 10" subs and they a 4 ohm, so I dont want to break my amp but it would save some channel space if I could bridge it. Help!
As far as your main qusestion, when you say bridging an amp, you're talking about taking the (+) from one channel on the amp and using the (-) from the other channel of the amp and using them to power your speakers. Usually these are marked on the amp which Channels (+) and (-) are used for bridging.
This link will make your head spin, but just remember this. Depending on how the speakers are connected (+) to (+) and (-) to (-) also known as Parallel, or Series (-) of first speaker to (+) of second, (-) of Second to (+) of third etc, it wil affect the impedence or OHM load. Also to take into account is how many voice coils are in the speaker.
There are lots of diagrams so it will be easier to understand.
http://www.bcae1.com/spkrmlti.htm
1st Gear Member
Joined: Apr 2005
Posts: 86
From:
RE: Another ? on bridging...
First off, what is an Ohm? That may help alittle...
For your application you need to set them up so you dont exceed the rated # of watts for your speakers
Power in WATTS = (Current in WATTS)^2 x Speaker Resistance in OHMS
Speaker Resistance in OHMS if the speakers are in series = Speaker 1 Resistance in Ohms + Speaker 2 Resistance in Ohms + Speaker 3 ... etc
Speaker Resistance in OHMS if speakers are in Parallel = ( Speaker 1 x Speaker 2 / Speaker 1 x Speaker 2 )
Gentleman's Relish
Joined: Feb 2005
Posts: 13,188
From: AZ
RE: Another ? on bridging...
ORIGINAL: Ebein
An Ohm is the Messure of Electrical Resistance.
For your application you need to set them up so you dont exceed the rated # of watts for your speakers
Power in WATTS = (Current in WATTS)^2 x Speaker Resistance in OHMS
Speaker Resistance in OHMS if the speakers are in series = Speaker 1 Resistance in Ohms + Speaker 2 Resistance in Ohms + Speaker 3 ... etc
Speaker Resistance in OHMS if speakers are in Parallel = ( Speaker 1 x Speaker 2 / Speaker 1 x Speaker 2 )
First off, what is an Ohm? That may help alittle...
For your application you need to set them up so you dont exceed the rated # of watts for your speakers
Power in WATTS = (Current in WATTS)^2 x Speaker Resistance in OHMS
Speaker Resistance in OHMS if the speakers are in series = Speaker 1 Resistance in Ohms + Speaker 2 Resistance in Ohms + Speaker 3 ... etc
Speaker Resistance in OHMS if speakers are in Parallel = ( Speaker 1 x Speaker 2 / Speaker 1 x Speaker 2 )
How about.."For your application you need to set them up so you don't drop the Ohms lower than the rated tolerance on your amp or you may fry your amp."
Thread Starter
6th Gear Member
Joined: May 2005
Posts: 5,736
From: MD/WV
RE: Another ? on bridging...
Lol, thanks, that helped. Umm, I used to have these really (really) ****ty subs that I didnt care about and I had them wired differently than anything I say on there. Or perhaps it was parralel I dont know. I had a wire running from the positive on the amp to the positive on a sub. Then, another wire running from the negative on the amp to the negative on the sub. Then I took another wire from the positive of the sub to the positive of the other sub, and the same for negative. MAybe you undertsood that....
3rd Gear Member
Joined: Aug 2005
Posts: 984
From:
RE: Another ? on bridging...
ORIGINAL: Derf00
Mmm...nope, you can get any amp to run any speaker if you use Watts as a determinent.
How about.."For your application you need to set them up so you don't drop the Ohms lower than the rated tolerance on your amp or you may fry your amp."
ORIGINAL: Ebein
An Ohm is the Messure of Electrical Resistance.
For your application you need to set them up so you dont exceed the rated # of watts for your speakers
Power in WATTS = (Current in WATTS)^2 x Speaker Resistance in OHMS
Speaker Resistance in OHMS if the speakers are in series = Speaker 1 Resistance in Ohms + Speaker 2 Resistance in Ohms + Speaker 3 ... etc
Speaker Resistance in OHMS if speakers are in Parallel = ( Speaker 1 x Speaker 2 / Speaker 1 x Speaker 2 )
First off, what is an Ohm? That may help alittle...
For your application you need to set them up so you dont exceed the rated # of watts for your speakers
Power in WATTS = (Current in WATTS)^2 x Speaker Resistance in OHMS
Speaker Resistance in OHMS if the speakers are in series = Speaker 1 Resistance in Ohms + Speaker 2 Resistance in Ohms + Speaker 3 ... etc
Speaker Resistance in OHMS if speakers are in Parallel = ( Speaker 1 x Speaker 2 / Speaker 1 x Speaker 2 )
How about.."For your application you need to set them up so you don't drop the Ohms lower than the rated tolerance on your amp or you may fry your amp."
Furthermore, it should be noted that the equation listed for resistors in parallel only works for 2 resistors. Where do you feel that "Power in watts=...." comes into play? I would like to hear your explanation for this, Ebein.