Members JBrig Posted May 27, 2008 Members Share Posted May 27, 2008 If I am looking at output on an amp and I am running 2 subs at 8 ohms each do I look at the 8 ohm output or 4? The amp will be bridged mono mode. Link to comment Share on other sites More sharing options...
Members congaron Posted May 27, 2008 Members Share Posted May 27, 2008 Double the 2 ohm output/channel for bridged mode into 4 ohms. Link to comment Share on other sites More sharing options...
Members JBrig Posted May 27, 2008 Author Members Share Posted May 27, 2008 Double the 2 ohm output/channel for bridged mode into 4 ohms. So I understand this Ohm thing, if I had only 1 sub at 8 ohms then I would read the 8 ohm output, correct? What if you had 4 subs at 8 ohms each and 1 amp to run them? Would this be the 2 ohm output on the amp? Link to comment Share on other sites More sharing options...
Members congaron Posted May 27, 2008 Members Share Posted May 27, 2008 Bridged changes things. 1- 8 ohm sub gets twice the 4 ohm rating. Two 8 ohm subs (or one 4 ohm sub) get twice the 2 ohm rating. Some amps can't do the latter BTW. Example: If a QSC rmx850 delivers 200@8 ohms, 300 @ 4 ohms, 430@ 2 ohms (close enough for an example, since I don't remember) Bridged output is: 600 @ 8 ohms (4 ohm ratingx2) 860@4 ohms (your two subs@ 8ohms each) Hope that helps. Link to comment Share on other sites More sharing options...
Members congaron Posted May 27, 2008 Members Share Posted May 27, 2008 So I understand this Ohm thing, if I had only 1 sub at 8 ohms then I would read the 8 ohm output, correct? What if you had 4 subs at 8 ohms each and 1 amp to run them? Would this be the 2 ohm output on the amp? In stereo, you could run two on each side, or four on one side if the amp is 2 ohm stable. Bridged is different...only two of those subs can be run in bridged mode IF the amp IS 2 ohm stable in bridged mode...some are only 2ohm stable in stereo mode. Some are neither. Link to comment Share on other sites More sharing options...
Members JBrig Posted May 27, 2008 Author Members Share Posted May 27, 2008 Thanks! Link to comment Share on other sites More sharing options...
Members congaron Posted May 27, 2008 Members Share Posted May 27, 2008 I suggest you try them in stereo mode, two per side...you may just get a pleasant surprize on the power...and avoid an unpleasant one from bridging. Link to comment Share on other sites More sharing options...
Members congaron Posted May 27, 2008 Members Share Posted May 27, 2008 Thanks! You're welcome. Link to comment Share on other sites More sharing options...
Members Mogwix Posted May 27, 2008 Members Share Posted May 27, 2008 So I understand this Ohm thing, if I had only 1 sub at 8 ohms then I would read the 8 ohm output, correct? What if you had 4 subs at 8 ohms each and 1 amp to run them? Would this be the 2 ohm output on the amp? Yep. 8 + 8 = 4 ohms nominal 8 + 8 + 8 = 2.6667 ohms nominal 8 + 8 + 8 + 8 = 2 ohms nominal IMO if you're running 4 subs you're better off driving a pair of subs per side of the amp. Bridged at 2 ohms is really hard on amps, and most aren't even rated to drive a 2 ohm load bridged. At 2 ohms you're creating a lot of stress on the amplifier (which equals heat) and as well at 2 ohms there's much more signal loss over longer cable runs. Try to stay away from bridging your amps, it's just one more thing that can go wrong. That few extra watts gets you maybe another decibel or two of output, if that. Save your amps and save your drivers. Link to comment Share on other sites More sharing options...
Members agedhorse Posted May 27, 2008 Members Share Posted May 27, 2008 What amps and speakers exactly? Bridging into 2 ohms is a sure path to amplifier destruction with only one or two exceptions. If you don't understand how bridging works, and why it should be used, and how ratings work, you shouldn't be doing it IMO. Link to comment Share on other sites More sharing options...
Members congaron Posted May 27, 2008 Members Share Posted May 27, 2008 I think all four of those 8 ohm subs in bridged mode would create lots of smoke and little else. Link to comment Share on other sites More sharing options...
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