Noob Bridge Question |
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mitchiemasha
Registered User Joined: 27 August 2009 Status: Offline Points: 466 |
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Posted: 23 December 2017 at 5:09pm |
I'm far from a noob but I've totally confused myself.
i, When putting 2 8 ohm speakers on an amp the resistance/load is 4 ohms. ii, When putting 2 8 ohm speakers on a bridged amp it's 2 ohms. That is what i was taught. Now is that 4 ohms total, 2 ohms each side of the amp, or 2 ohms total? My main question is. When bridging, with 2 8 ohms, when we look at the amp spec sheet, do we take this into account or do we simply look at the 4 ohm?
The amp can run fine 2 ohms each side and 4 ohms bridged. Have they already taken into account as many people don't know to reduce the ohmage again or is 'ii' wrong anyway? |
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markie
Old Croc Joined: 31 October 2005 Location: Sunny Liskeard. Status: Offline Points: 4570 |
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2 x 8 ohm speakers in parallel gives a total impedence of 4 ohms whatever it's connected to. I think your confusing the amp specs with the speaker impedence.But when you're running is stereo/parallel mono each side of the amp is seeing an 8 ohm load.... the speakers are not in parallel, they are connected one to each side of the amp.
If your amp is quoted as 4 ohms per side then the speaker load should be min 8 ohms when in bridge mode. You say your amp is fine @ 2 ohms per side, then bridge impedence should not be less than 4 ohms. Your 2 x 8 ohm speakers should be fine. When you are in bridge mode each side of the amp sees 1/2 the total impedence load so as above 2 8 ohm speakers in parallel is 4 ohms total load, but each side of the amp sees 1/2 of that load so each side is running with a 2 ohm load. I probably haven't explained that very well, but doubtless there will be an adult along soon who will correct me. Edited by markie - 23 December 2017 at 8:36pm |
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JonB67
Young Croc Joined: 22 April 2016 Location: UK Status: Offline Points: 1376 |
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Wow. Quite a pickle. Markie is spot on.
2x 8r speakers in parrallel are 4 ohms regardless of if they are on a single channel or bridged. If on a single channel then that channel has a 4r load. If in bridge then the two channels share the load and see 2r each. So in answer to your question, just look at the 4ohm bridged spec on the amps manual. Edited by JonB67 - 23 December 2017 at 11:50pm |
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mitchiemasha
Registered User Joined: 27 August 2009 Status: Offline Points: 466 |
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Yes... Thank you. That clears it up for me.
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