d2jsp
Log InRegister
d2jsp Forums > Off-Topic > General Chat > Car Audio > How Do Ohms Affect The Output Of An Amplifier
12Next
Add Reply New Topic New Poll
Views: 2359Replies: 13Track Topic
Member
Posts: 25,108
Joined: Jun 9 2009
Gold: 1.64
#1
Aug 27 2012 08:45am
im trying to understand this but maybe i am too tired...

do ohms divide the wattage? :huh:
is it the speaker load + ohms that change the wattage?


say i got a two sub 8 ohm setup and a 2kw amp @ 800W each.




:huh:
Member
Posts: 32,985
Joined: Mar 17 2005
Gold: 6.00
#2
Aug 27 2012 08:53am
what exactly do you mean by 2 sub 8 ohm?

as in two 8 ohm single voice coil or two 4 ohm single voice coil or two 2 ohm dual voice coil?

ohms is basically electrical resistance. the higher the ohm load the more resistant it is.
Member
Posts: 25,108
Joined: Jun 9 2009
Gold: 1.64
#3
Aug 27 2012 09:33am
Quote (Subwoofer @ Aug 27 2012 07:53am)
what exactly do you mean by 2 sub 8 ohm?

as in two 8 ohm single voice coil or two 4 ohm single voice coil or two 2 ohm dual voice coil?

ohms is basically electrical resistance. the higher the ohm load the more resistant it is.




lets say that they are both 4 ohm subs
wired in series to make 8 ohms (or am i wrong about that)


Member
Posts: 20,816
Joined: Dec 23 2008
Gold: 4,250.69
#4
Aug 27 2012 09:50am
Ohmsare the measurement of resistancein an electrical circuit.
Less resistance = more power! (power is measured in watts)
Wiring different sub woofers differently allows you to drop the resistance in the circuit. Fewer ohms = more wattage from the amp.
Too little resistance and there will be too much power going through your amplifier, that's when you start seeing smoke haha!

Here, this might help you understand a little better..
http://www.rockfordfosgate.com/rftech/woofer_wizard.asp?AspxAutoDetectCookieSupport=1

This post was edited by dr_deranged on Aug 27 2012 09:57am
Member
Posts: 25,108
Joined: Jun 9 2009
Gold: 1.64
#5
Aug 27 2012 10:29am
Quote (dr_deranged @ Aug 27 2012 08:50am)
Ohmsare the measurement of resistancein an electrical circuit.
Less resistance = more power! (power is measured in watts)
Wiring different sub woofers differently allows you to drop the resistance in the circuit. Fewer ohms = more wattage from the amp.
Too little resistance and there will be too much power going through your amplifier, that's when you start seeing smoke haha!

Here, this might help you understand a little better..
http://www.rockfordfosgate.com/rftech/wooferwizard.asp?AspxAutoDetectCookieSupport=1


>< isnt there a simple formula u can do to make it all make sense?

ill try the link but i am looking for real number output with the circumstances provided.

thanks




e/ i know about wiring in series and parallel... ._.;;

This post was edited by TJI_KS on Aug 27 2012 10:31am
Member
Posts: 20,816
Joined: Dec 23 2008
Gold: 4,250.69
#6
Aug 27 2012 11:08am
Quote (TJI_KS @ Aug 27 2012 11:29am)
>< isnt there a simple formula u can do to make it all make sense?

ill try the link but i am looking for real number output with the circumstances provided.

thanks




e/ i know about wiring in series and parallel... ._.;;


Sure. Parallel divides the resistance, series multiplies the resistance.

For example, three speakers that are each 4 ohm in parallel (red to red, black to black) is 4 ohm / 3 speakers = 1.3 ohm load.

Two speakers that are each 4 ohm in series (red to black to red to black) is 4 ohm x 2 speakers = 8 ohm load.
Member
Posts: 25,108
Joined: Jun 9 2009
Gold: 1.64
#7
Aug 27 2012 11:18am
Quote (dr_deranged @ Aug 27 2012 10:08am)
Sure. Parallel divides the resistance, series multiplies the resistance.

For example, three speakers that are each 4 ohm in parallel (red to red, black to black) is 4 ohm / 3 speakers = 1.3 ohm load.

Two speakers that are each 4 ohm in series (red to black to red to black) is 4 ohm x 2 speakers = 8 ohm load.




ok but what does that do to the numbers on the amp? and the speakers?? :huh:

this stuff isnt my fortay... but im kinda interested in getting a new hobby...
Member
Posts: 20,816
Joined: Dec 23 2008
Gold: 4,250.69
#8
Aug 27 2012 11:48am
Quote (TJI_KS @ Aug 27 2012 12:18pm)
ok but what does that do to the numbers on the amp? and the speakers?? :huh:

this stuff isnt my fortay... but im kinda interested in getting a new hobby...


1.3 ohm load and 8 ohm load would be the load on the amp. Like I said, less resistance = more power.
If you amp can't handle a low load (such as 1 or 1.3 ohms) and you put it on there anyway, you fry the amp.
Member
Posts: 25,108
Joined: Jun 9 2009
Gold: 1.64
#9
Aug 27 2012 12:26pm
Quote (dr_deranged @ Aug 27 2012 10:48am)
1.3 ohm load and 8 ohm load would be the load on the amp. Like I said, less resistance = more power.
If you amp can't handle a low load (such as 1 or 1.3 ohms) and you put it on there anyway, you fry the amp.




so 2x 800W speakers @ 4ohmes each connected in a series making it 8 ohms would still put 800 to each if connected to a properly configured 2000W amp?
the ohms dont affect the power going thru the speaker?

This post was edited by TJI_KS on Aug 27 2012 12:26pm
Member
Posts: 20,816
Joined: Dec 23 2008
Gold: 4,250.69
#10
Aug 27 2012 03:57pm
Quote (TJI_KS @ Aug 27 2012 01:26pm)
so 2x 800W speakers @ 4ohmes each connected in a series  making it 8 ohms would still put  800 to each if connected to a properly configured 2000W amp?
the ohms dont affect the power going thru the speaker?


Quote (dr_deranged @ Aug 27 2012 12:48pm)
1.3 ohm load and 8 ohm load would be the load on the amp. Like I said, less resistance = more power.
If you amp can't handle a low load (such as 1 or 1.3 ohms) and you put it on there anyway, you fry the amp.


Inherently, more resistance = less power.
If you have two speakers that are single voice coil 4 ohm speakers just hook them up pos to pos to pos and neg to neg to neg.
If it's a 2-channel amp then one channel for each speaker.
if it's a mono block (1 channel amp) then the pos from both speakers goes to pos on the amp and the neg from both speakers goes to neg on the amp.
Go Back To Car Audio Topic List
12Next
Add Reply New Topic New Poll

© 2003-2026 d2jsp  Contact