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Post subject: 8ohms to 4 ohms
Posted: Sat Dec 25, 2010 1:21 pm
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Dont always need to bring my 8/10 cab with my SVT. I have a 15 in. Ampeg cab also but it is rated at 8 ohms. Will replacing the speaker with a 4 ohm speaker do the trick? Any help is apreciated.


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Post subject: Re: 8ohms to 4 ohms
Posted: Wed Jan 12, 2011 3:44 pm
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You can play a 8 0hm speaker but will lose some power. I have a Peavey mark 4 that on the back say's 400 watts @ 2 ohms, 250 watts @ 4 ohms. Doesn't say anything about about 8 ohms but been useing it since 93 & over a 1000hrs play time on that head alone. No problems doing it. I use a single 15". Another thing is you can use 2 12's or two 10's in a smaller cabinet wired in series to give 4 ohm's. Be carefull with that head on power though. I also have smaller heads & cab's for smaller gig's or practice which you might want to think of. Back in the early 80's I used to lug around a Fender PS 400 head with two 15" reflex cab's & two twelves on top. Needless to say a soundmans nightmare if they ever tried to mic me,,,lol. The drummer would have more help then me also!!! lol That tube amp was rated two ohm's also. Hope that gives you a idea.


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Post subject: Re: 8ohms to 4 ohms
Posted: Mon Jan 17, 2011 12:15 pm
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I told you something wrong,,You wanna put the two 8 ohm speakers in parrel to give you 4 ohms. What I told you works for Caps not resistance. To put the two speakers in parrell your wires out, from amp, would be center cord wirer (positve) would go to both Pos(+) on the speakers. The outer part of the cord (ground) would go to both negs(-). R1+R2 divided by 2 = 4. Series would have given you 16 ohms. I messed up because I was working on something else dealing with capacitance earlier & that is the opposite of resistance & ohms law (E= IxR). When I put things away today I relized what I had told you. I would just use the 8 ohm the way it is though. Sorry about that, Jim


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Post subject: Re: 8ohms to 4 ohms
Posted: Sun Jan 23, 2011 1:04 pm
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You didn't say which SVT so I'm guessing Classic. If it is the Classic it likes 4 ohms or 2 ohms. Certainly you could replace the speaker with a 4 ohm speaker, but it should be rated 300 watts or better. Or you could use the 15 inch 8 ohm cab as is if it is rated high enough with another adequately rated 8 ohm cab and stack them. You didn't say what your 15 inch cab is rated either. Many 15 inch cabs, especially the older ones, won't take 150 watts for long. Each cab should be capable of 150 watts.

If you have one of the solid state SVT heads like the 350 or 450 they will work fine with an 8 ohm cab so long as the cab's watt rating is adequate.


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