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Old August 31st, 2012, 08:58 PM   #1 (permalink)
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How To Wire 3-10" to 8 Ohms

Hey everyone...........
just bought a Weber 3-10 Bandmaster cabinet from a friend on another forum for a really great price.I actually bought it for my '56 Pro Amp (5E5-A) chassis,because the cab is tanked.He builds amps and said it is a perfect fit.
My question (obviously)---the Pro is 8 ohms....how do I wire 3-10" for 8 ohms?
Thanks in advance!

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Old August 31st, 2012, 09:08 PM   #2 (permalink)
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Well, if you need exactly 8 ohm, you'll have to get creative. If you get one 16-ohm 10" speaker and two 8-ohm ones, you could put the two 8s in series, and the 16 in parallel with that.

But you won't get equal power sharing between the three. Half the power will go to one speaker, and the other half will be divided between two.

If you just put three 16-ohm speakers in parallel, you'll get about 5.33 ohms, which is probably close enough for a Fender transformer.
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Old August 31st, 2012, 09:19 PM   #3 (permalink)
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Can't really be done while still dividing the signal equally between all three speakers. If you have three 16-ohm drivers in parallel the overall impedance will be 5.33 ohms. Three 4-ohm speakers in series will present a 12-ohm load. Your amp may or may not tolerate one mismatch or the other.

Best way, possibly, is to use just two 16-ohm speakers of appropriate power handling, wired in parallel for an 8-ohm load, and blank off the third cutout to avoid phase cancellation and consequent loss of bottom end.

Edit: David (above) posted while I was typing this. Everything he says is true.
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Old August 31st, 2012, 09:31 PM   #4 (permalink)
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Thanks guys.....that's pretty much what the seller said too.
I would love to have a 1-15,the Pro sounded so good with that.Might have to go 2-10s and suggested.
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Old August 31st, 2012, 09:35 PM   #5 (permalink)
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Get a new baffle cut for a 15.
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Old August 31st, 2012, 09:36 PM   #6 (permalink)
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Thinking out loud here, is there an extension speaker jack on your Pro?
In looking at the schematic it shows one as extra 8 ohm speaker.
What about 2 16 ohm speakers wired in parallel to the main speaker jack and the other speaker at 8 ohms plugged into the extension speaker jack.
It would place the amp at 4 ohms total then.
I'm not sure how the volume would vary between the 2 speaker arrays, I'm thinking one set or the single speaker may get more power or be louder unless they were same db efficiency.

Like I said, thinking out loud and sometimes that may be dangerous.

Maybe Wally or muchxs will chime in and help you out.
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Old August 31st, 2012, 09:40 PM   #7 (permalink)
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Get a new baffle cut for a 15.
While I was writing my novel there, Fezz came up with the obvious solution.
I salute you my good man.
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Old August 31st, 2012, 09:57 PM   #8 (permalink)
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Get a new baffle cut for a 15.
I have SERIOUSLY entertained that...........
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Old August 31st, 2012, 10:01 PM   #9 (permalink)
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It's what I'd do.

5e7, 5f4, 5e5a are all pretty much the same except for the OT and speaker compliment.
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Old August 31st, 2012, 10:05 PM   #10 (permalink)
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I have a '59 Bassman,have always loved 4-10s.....a friend had an original 310 Bandmaster that sounded great,so I got curious...........
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Old September 1st, 2012, 12:50 PM   #11 (permalink)
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What output transformer did Fender use in the 5E7? Did they bother to match it to the 2.6 ohm load, or just get "close enough?
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Old September 1st, 2012, 01:30 PM   #12 (permalink)
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According to Greg Gagliano the brownface 3x10 Bandmaster had an 8-ohm output transformer but with the 3 8-ohm speakers the actual load was 2.7 ohms!

It is interesting to note that the original 6G7 Bandmaster used three 8-ohm speakers for a total impedance of 2.7 ohms which is a 3-fold mismatch for the 8-ohm output transformer. Post-tweed era Fender transformers (mainly Schumacher units) were very tolerant of up to a 2-fold mismatch in output impedance. This is why most of the brown, blonde and blackface amps have and extension speaker jack. You can run your Deluxe Reverb with an 8-ohm extension cab (yielding a total impedance of 4-ohms) without a hitch. Perhaps the 3-fold mismatch on the 3x10 Bandmaster is part of the secret to its great sound.
http://www.ggjaguar.com/projbmaster.htm

I would probably go with a 4-ohm transformer and call it close enough.
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Old September 1st, 2012, 02:07 PM   #13 (permalink)
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Well, if you need exactly 8 ohm, you'll have to get creative. If you get one 16-ohm 10" speaker and two 8-ohm ones, you could put the two 8s in series, and the 16 in parallel with that.

But you won't get equal power sharing between the three. Half the power will go to one speaker, and the other half will be divided between two.
That's perfect.

Go for a 16 ohm Eminence 10516 which handles 75 watts all by itself. Then throw a couple funky old 8 ohm alnicos in series.

The Emi will see around 20 watts cranked while your two alinicos will see the other 20.

You'll get definition and punch from the ceramic and a vintage feel (less definition and punch but the ceramic takes care of that) You'll get a vintage feel from the alnicos.
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Old September 2nd, 2012, 12:51 AM   #14 (permalink)
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Hey everyone...........
just bought a Weber 3-10 Bandmaster cabinet from a friend on another forum for a really great price.I actually bought it for my '56 Pro Amp (5E5-A) chassis,because the cab is tanked.He builds amps and said it is a perfect fit.
My question (obviously)---the Pro is 8 ohms....how do I wire 3-10" for 8 ohms?
Thanks in advance!
You don't.
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Old September 2nd, 2012, 02:29 AM   #15 (permalink)
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You don't.
Unless of course you can get hold of three 24-ohm speakers...
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Old September 2nd, 2012, 12:07 PM   #16 (permalink)
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Unless of course you can get hold of three 24-ohm speakers...
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Old September 2nd, 2012, 01:30 PM   #17 (permalink)
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What were the original speakers in a Tweed Bandmaster?
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Old September 2nd, 2012, 04:07 PM   #18 (permalink)
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5e7's used a Triad 1848. 4 ohm OT, just like the Super.
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Old September 2nd, 2012, 05:13 PM   #19 (permalink)
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5e7's used a Triad 1848. 4 ohm OT, just like the Super.
Yup. That's the way to go. Just like Leo done it.
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Old September 2nd, 2012, 07:27 PM   #20 (permalink)
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You could always try a weber z-matcher

http://taweber.powweb.com/store/zmatch.htm
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