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Old 16th August 2006, 03:30 PM   #1
inrank is offline inrank  United Kingdom
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Default OB Sub, which amp?

thinking of making an OB speaker (on my fullrage thread) and was wondering if there was a sub amp that would drive say 2 Dayton RS225's each side, or would i have to use one sub amp per channel, if i can, i would like to use the high pass filter on the sub for the FullRanger on top.
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Old 16th August 2006, 03:32 PM   #2
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Well what is the impedance of the Dayton's? If they are 8 ohms each, you just need to find a sub amp that can handle 4 ohms, which should be easy enough.
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Old 16th August 2006, 03:34 PM   #3
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you can get either a 4 or 8 ohm version, i have a sub at the moment, a Tannoy TS8, i guess its a 4ohm amp (200w), could i use that if it is?
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Old 16th August 2006, 04:15 PM   #4
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Best stop guessing and take the Tannoy apart It might have some other fixed EQ that you need to deal with though.
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Old 16th August 2006, 04:23 PM   #5
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Click the image to open in full size.

no idea if it has a fixed EQ.....

the drive unit measures 3.1 Ohms so i guess its 200w at 4Ohms
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Old 17th August 2006, 09:53 AM   #6
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Good stuff. Is the Tannoy a vented box? Might be less likely to have some EQ then.
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Old 17th August 2006, 04:27 PM   #7
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no, its sealed.
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Old 17th August 2006, 06:06 PM   #8
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I'd go with 8 ohm versions, wire them parallel to get a 4 ohm load for each amp channel. Behringer A500 is a good choice. 230w into 4 ohms per channel. I doubt you would need more than this for OB use. If this were a box sub, then I'd suggest Behringer EP2500 with 650w into 4 ohms per channel or 1200 into 2 ohms. The latter amp has a fan and so would have to go in another room, or in floor/ceiling.
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