Mr. Foxen Posted March 15, 2009 Posted March 15, 2009 I'm sure there was a thread with a chart, but didn't spot it in the wiki or from searches. Question is, what impedance should the speakers in my 8x10 be? Didn't spot a number when I whipped one of them out, but I saw it was a Celestion BG10T-150, google came up with 16 ohm, but I'm not sure you can make a 4 ohm 8x10 out of that. Now leaning towards it actually being 8, and its at the practice space to I can't whip it out and meter it. Quote
bass_ferret Posted March 15, 2009 Posted March 15, 2009 Meters dont usually read impedence cos it varies by frequency. Its a nominal value. As for whether you can make an 8x10 from 8 ohm speakers I cant be arsed to do the maths (or math as Bill would say) so you will have to do it yourself. There is a link to an impedence calculator somewhere on here. Quote
Mr. Foxen Posted March 15, 2009 Author Posted March 15, 2009 The meter would give me close enough to figure if its 8 or 16, dc resistance is around 30% different, unless it is more complicated that my experience of metering all the speakers about the house to practice told me. The calculator linked int the wiki does 2 3 and 4 speakers, and I don't have excel on this pc. Thinking of it as 2 4 speaker cabs, I don't think they can be 16s, but I might not be being creative enough with my wiring. Quote
bass_ferret Posted March 15, 2009 Posted March 15, 2009 The only thing I can suggest for wiring creativity is to draw it out on the old mk 1 pen and paper Quote
Hamster Posted March 15, 2009 Posted March 15, 2009 It looks like if you want a 4 ohm 8x10 cab, they have to be 32 ohm wired in parallel, or 4 ohm wired in series/parallel Quote
Mr. Foxen Posted March 15, 2009 Author Posted March 15, 2009 It is 4 ohm, and its 8s or 16s, my current thinking is they are 8s in parallell pairs of series pairs, then connected in paralell. Really, I want an 8 ohm cab anyway, since my valve head doesn't go down to 4 ohm, what I needed to know was what speakers are in it. Quote
alexclaber Posted March 16, 2009 Posted March 16, 2009 16 ohm drivers can't get you 4 ohms. 8 ohm can. I gather lower impedance is better than higher (assuming you don't have the right tap) with a valve amp. Alex Quote
bumnote Posted March 16, 2009 Posted March 16, 2009 (edited) If my maths is correct a normal 4x10 with a total impedance of 8ohms has two pairs of 8 ohm speaker wired in series giving 16 ohms each pair If these two pairs are then wired in PARALLEL the total impedance is back to 8 ohms and 2 8 ohm cabs gives you a 4 o ohm load if wired in parrallel. Edited March 17, 2009 by bumnote Quote
Mr. Foxen Posted March 16, 2009 Author Posted March 16, 2009 This was a shared cab, looks like I'm buying the other half so I can do with it what I want, so will probably wire it to 16 ohm to match my head. Totally not comfortable mismatching either way, with vast amounts of contrary opinions from supposedly reliable sources. Quote
goingdownslow Posted March 16, 2009 Posted March 16, 2009 [quote name='bumnote' post='436416' date='Mar 16 2009, 06:27 PM']If my maths is correct a normal 4x10 with a total impedance of 8ohms has two pairs of 8 ohm speaker wired in series giving 16 ohms each pair If these two pairs are wired in series the total impedance is back to 8 ohms. [size=5]X[/size] and 2 8 ohm cabs gives you a 4 o ohm load if wired in parrallel.[/quote] Write out 100 times If these two pairs are wired in PARALLEL the total impedance is back to 8 ohms Quote
bumnote Posted March 17, 2009 Posted March 17, 2009 [quote name='goingdownslow' post='436705' date='Mar 16 2009, 10:09 PM']Write out 100 times If these two pairs are wired in PARALLEL the total impedance is back to 8 ohms [/quote] I am a pillock I am a pillock I am a pillock I am a pillock I am a pillock I am a pillock I am a pillock I am a pillock I am a pillock I am a pillock I am a pillock Quote
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