Please can someone answer this?

[themainjam 10+ year member]

i have asked this question numerous times and no one has answered me..... at least not clearly.

say you have a kicker amp 2ch (50RMSX2 @4ohms) (100RMSX2 @ 2ohms)(bridgeable 400RMSX1@4ohms stable at 4 ohms)

now if you bridge a speaker thats 4 ohms does the resistance get split between the two speaker terminals making it a 2 ohm speaker load? i read this in the jlaudio gain tutorial......

or do only some amps have this problem(or feature?)

Please someone just tell me.....

Click to read more...

 

[Norcalracer283 10+ year member]

What speaker? Is it a sub? Is it dual voice coil? When u bridge an amp, you just take the two outer outputs. say its +-+- you would take the first possitive and the last negative. Then it simply becomes a mono amp. Just look up mono wiring diagrams.

 

[themainjam 10+ year member]

ok i know how to wire the speakers and they have a final impedance of 4 ohms (2 8 ohms SVC wired in paralel) but i read in that tutorial though that when you bridge the amp the impedance is split between the two channels making a 4 ohms wired speaker to 2 ohms....

 

[themainjam 10+ year member]

i am sorry if i sound like a newbie but i have a amp thats supposed to be stable at 4 ohm bridged but when i hook it up it take like 5 minutes for it to go into safe mode even with the gains all the way down.......

 

[supa_c 5,000+ posts]

Something is wired wrong.

 

[Norcalracer283 10+ year member]

u still havent said what amp and subs

 

[supa_c 5,000+ posts]

u still havent said what amp and subs

yes, that would help out alot

 

[Tirefryr 10+ year member]

The amp spilts the load and it recognizes the 4 ohm mono load as 2 separate 2ohm loads, as if it were running two 2 ohm drivers in stereo. Hence the supposed quadruple in power.

 

[JoseMCeee 10+ year member]

Im planning on gettin a 1 L7 and a audiobahn that handles 800 x 1 at 4 ohm. If the sub im getting says it is a dual vc, how do i wire it so it works witht he 4 ohm in mono?

 

[Black_Jesus 10+ year member]

im not familiar with the L7's ohm ratings.. nonetheless this should cover u

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http://jlaudio.com/tutorials/wiring/index.html

 

[supa_c 5,000+ posts]

X2 on that link.

 

[themainjam 10+ year member]

The amp spilts the load and it recognizes the 4 ohm mono load as 2 separate 2ohm loads, as if it were running two 2 ohm drivers in stereo. Hence the supposed quadruple in power.

OK YOU HIT THE NAIL ON THE HEAD. i misunderstood what i read. i thought it meant that the 4 ohm gets split to a single 2 ohm load(not 2ohm per channel stereo)

BTW the speakers are in my sig.. but thanks a ton i was so confused....

 

[johnecon2001 5,000+ posts]

OK YOU HIT THE NAIL ON THE HEAD. i misunderstood what i read. i thought it meant that the 4 ohm gets split to a single 2 ohm load(not 2ohm per channel stereo)
BTW the speakers are in my sig.. but thanks a ton i was so confused....

Actually all of that was mostly wrong. Impedence/resistance is NOT set by the amp. The speaker sets the resistance or OHM load going to the amp, depending on how the speaker was made to run (2 ohms, 4, 6, 8, 16 etc..). By bridging your amp, no resistance or OHM load is set until you hook up a speaker. In your case you'll get a 4 ohm load. No amp splits resistance... thats just silly. Bridging means you're combining two channels into one hence the term MONO.

Your amp going into protection mode is probably because of a bad ground, or your wiring in parallel.. not in series. Making the final load less than 4 ohms.

 

[Tirefryr 10+ year member]

Actually all of that was mostly wrong. Impedence/resistance is NOT set by the amp. The speaker sets the resistance or OHM load going to the amp, depending on how the speaker was made to run (2 ohms, 4, 6, 8, 16 etc..). By bridging your amp, no resistance or OHM load is set until you hook up a speaker. In your case you'll get a 4 ohm load. No amp splits resistance... thats just silly. Bridging means you're combining two channels into one hence the term MONO.
Your amp going into protection mode is probably because of a bad ground, or your wiring in parallel.. not in series. Making the final load less than 4 ohms.

And when in mono mode each channel is still being driven as if it were seeing a 2 ohm load. Thank you very much. Now if it were a final load of 8 ohms in mono, the amp would in effect be seeing 4 ohms per channel. I am NOT wrong.

 

[squeak9798 5,000+ posts]

Actually all of that was mostly wrong. Impedence/resistance is NOT set by the amp. The speaker sets the resistance or OHM load going to the amp, depending on how the speaker was made to run (2 ohms, 4, 6, 8, 16 etc..).

Correct

By bridging your amp, no resistance or OHM load is set until you hook up a speaker.

Still correct

In your case you'll get a 4 ohm load. No amp splits resistance... thats just silly. Bridging means you're combining two channels into one hence the term MONO.

Right...it's still a 4ohm final load. But each channel on the amp will carry ("see") half of that load....so each channel would "see" a 2ohm load. Did ya ever notice it was kinda odd how the 4ohm mono rating was the sum of the power output per channel at 2ohm?? Think there is a reason for that?? Yes, there is a reason for that.....and it's because each channel essentially has a 2ohm load on it.