Amps and Ohms
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From: Rocky Mount, N.C.
Amps and Ohms
I have an Infinity 7541 amp that is rated for 111 watts/channel @ 4 ohms. Is that 4 ohms for each channel? It is a 4 channel amp and right now I have my 4 door speakers hooked up one to each channel. So that makes a 4 ohm load on each channel. (they are 4 ohm speakers. Kicker coaxials) I plan on bridging the rear channel and hooking up an 8" sub to that. Big question is can I safely run all four door speakers on the front two channels. I know if they are in parallel, then it will be a 2 ohm load per channel. A note in the instructions for the amp said that minimum impedance load for stereo operation is 2 ohms. Now if I series the speakers, than that makes an 8 ohm load, right? Is there an advantage to having them hooked up either way?
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From: Wichita KS
Originally Posted by AFjetmech
I have an Infinity 7541 amp that is rated for 111 watts/channel @ 4 ohms. Is that 4 ohms for each channel? It is a 4 channel amp and right now I have my 4 door speakers hooked up one to each channel. So that makes a 4 ohm load on each channel. (they are 4 ohm speakers. Kicker coaxials) I plan on bridging the rear channel and hooking up an 8" sub to that. Big question is can I safely run all four door speakers on the front two channels. I know if they are in parallel, then it will be a 2 ohm load per channel. A note in the instructions for the amp said that minimum impedance load for stereo operation is 2 ohms. Now if I series the speakers, than that makes an 8 ohm load, right? Is there an advantage to having them hooked up either way?
yes that's 111w PER channel at 4 ohm PER channel. Yes you can run the 4 door speakers on the front 2 channels. I wouldn't since power to each speaker is going to be cut to around 70w per channel since that amp puts out 139w at 2 ohms per channel. If you hook the speakers up in series your going to cut the power put out by that amp and have about 25w going to each speaker. Again I wouldn't do it.
Your best bet would to be either 1: Don't run the rear speakers. Or 2: Get a amp for the subs.
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From: Wichita KS
There's no "real" disadvantage here. Your amp claims it will handle a 2 ohm load so it will play 4 speakers on the front channels. So go ahead and do it. It won't be as loud but it should work. Just hook it up and let your ears be the judge.
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From: Rocky Mount, N.C.
I hooked the 4 door speakers to the front channels today in parallel. Still waiting for my sub and box to arrive. The speakers sounded just fine and after cranking them to the point of distortion for awhile, nothing seemed wrong with the amp. I may set the front channels to high pass once I have the sub hooked up and I assume that will draw even less from them. Appreciate the advice from Impact9. Thanks!