OB Sub, which amp?

inrank · 16th August 2006, 02:30 PM

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.

richie00boy · 16th August 2006, 02:32 PM

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.

inrank · 16th August 2006, 02:34 PM

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?

richie00boy · 16th August 2006, 03:15 PM

Best stop guessing and take the Tannoy apart

It might have some other fixed EQ that you need to deal with though.

inrank · 16th August 2006, 03:23 PM

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

the drive unit measures 3.1 Ohms so i guess its 200w at 4Ohms

richie00boy · 17th August 2006, 08:53 AM

Good stuff. Is the Tannoy a vented box? Might be less likely to have some EQ then.

inrank · 17th August 2006, 03:27 PM

no, its sealed.

paulspencer · 17th August 2006, 05:06 PM

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.

16th August 2006, 02:30 PM	#1
inrank diyAudio Member Join Date: Oct 2005	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.

16th August 2006, 02:32 PM	#2
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	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. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

16th August 2006, 03:15 PM	#4
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	Best stop guessing and take the Tannoy apart It might have some other fixed EQ that you need to deal with though. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

17th August 2006, 08:53 AM	#6
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	Good stuff. Is the Tannoy a vented box? Might be less likely to have some EQ then. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

17th August 2006, 05:06 PM	#8
paulspencer diyAudio Member Join Date: Sep 2003 Location: Melbourne, Australia	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. __________________ AUDIO BLOG \| Bass integration guide My work: www.redspade.com.au web design studio


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16th August 2006, 02:34 PM	#3
inrank diyAudio Member Join Date: Oct 2005	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?

16th August 2006, 03:23 PM	#5
inrank diyAudio Member Join Date: Oct 2005	no idea if it has a fixed EQ..... the drive unit measures 3.1 Ohms so i guess its 200w at 4Ohms

17th August 2006, 03:27 PM	#7
inrank diyAudio Member Join Date: Oct 2005	no, its sealed.

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