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Old 2nd November 2007, 01:09 PM   #1
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Default Subs for my PA system (an ohm question)

I am putting new 15" raw speakers in existing cabinets to run as subs for my band's PA system. The issue I am having is I can only find 8 ohm speakers, and I want 4 ohm speakers.

I am no expert at ohm loads, but I have always been told there is no way to lower the ohm load, only increase it correct? So if I buy two 8 ohm speakers and run them bridged out of a QSC 2450, I will be at an 8 ohm load and restricted to 8 ohm wattage output correct?

Is there any way around this other than find (and pay for) 4 ohm speakers?

The second question is with the 8 ohm speakers be effective with the QSC 2450?
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Old 2nd November 2007, 02:53 PM   #2
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Two 8 ohm speakers connected in parallell will result in a 4 ohm load.
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Old 2nd November 2007, 09:13 PM   #3
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Hi KP,

Not sure where you picked up that little tidbit but Lord H is correct. Two 8 ohm in parallel results in a 4 ohm load. Two 8 ohm in series is a 16 ohm load.
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Old 3rd November 2007, 06:38 AM   #4
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Maybe consider running them in parallel as the others have suggested, so make the subs a mono channel and run them from the bridged output of the amp.

Also, take into consideration that the new speakers might not behave as the old ones did in that cabinet, given that it may have been tuned to work well with the old drivers.
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