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FDP Forum / Fender Amps: Vintage (before 1985) / Can a BF bandmaster run 2 4 ohm cabinets?

Guitar Fool
Contributing Member
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Sunshine State

Just a pawn in someone else's game
Apr 26th, 2016 10:40 AM   Edit   Profile   Print Topic   Search Topic

I have a 66 BM..and I'm curious if I can run 2 4 ohm cabs...one in the speaker jack and the other in the Ext. Speaker jack..

if the jacks are in parallel then I got a 2ohm load, I they are in series its an 8ohm load....and I know the BM wants to see 4..

which is worse?..or is there no real solution to this?

carsten

on the rhine

Apr 26th, 2016 11:11 AM   Edit   Profile   Print Topic   Search Topic

Hi Guitar Fool!

Yes, there´s no "real" solution to this - it´s an impedance-mismatch any way you look at it.
Some say it´s worse to run into a higher load, some say it´s worse to run into a lower load...
I´d like to know this myself ;-)

cheers - C.

Steve Dallman
Contributing Member
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Merrill, Wisconsin

Age is just a number...mine is big
Apr 26th, 2016 11:39 AM   Edit   Profile   Print Topic   Search Topic

Yes...a 100% mismatch is fine. You'll lose a couple watts due to the mismatch, but you'll make it up with the extra speaker coverage.

Lower is actually safer than higher. The amp will run a bit hotter.

2-8 ohms...it's all good.

Steve Dallman
Contributing Member
*********

Merrill, Wisconsin

Age is just a number...mine is big
Apr 26th, 2016 11:42 AM   Edit   Profile   Print Topic   Search Topic

Note...we're talking old Fenders here. Some amps are much more sensitive to impedance mismatches...Marshalls for instance. Mesa even encourages mismatches.

Guitar Fool
Contributing Member
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Sunshine State

Just a pawn in someone else's game
Apr 26th, 2016 12:13 PM   Edit   Profile   Print Topic   Search Topic

"Yes, there´s no "real" solution to this - it´s an impedance-mismatch any way you look at it"

Hey Carsten.... I did a search on this topic and got all sorts of different viewpoints on it...

Steve... thanks for nailing it down so to speak..

actually the amp cabinet has 4 8ohm speakers... and a 4 ohm jack for running 2 speakers in parallel and a 2 ohm jack if you want to run all 4 in parallel

I was thinking that if I rewired the 2 ohm jack to run the other 2 speakers in parallel at 4ohms, I could run 2 cables into the head...

2 speakers on the main jack at 4 ohms and the other 2 speakers at 4 ohms on the extension jack..

Given the choice, is it better to use the 2 ohm jack on the cabinet into the main speaker jack on the head or the other way that I was thinking of...is one way any better than the other?


kinda confusing for sure....

(This message was last edited by Guitar Fool at 02:43 PM, Apr 26th, 2016)

Hammond101
Contributing Member
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So. Cal. USA

Apr 26th, 2016 12:58 PM   Edit   Profile   Print Topic   Search Topic

It would make no difference. In using two speaker cables to two 4 ohm loads all you would be doing is moving the parallel point to the speaker jacks on the amp. I'd run one cable to the cab and call it good.

Guitar Fool
Contributing Member
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Sunshine State

Just a pawn in someone else's game
Apr 26th, 2016 01:48 PM   Edit   Profile   Print Topic   Search Topic

"It would make no difference"

Thanks for the help..

I didn't figure it did..

as I said initially i checked many different other forums and got a mixed bag of info..

this place has tons of amp savvy people

Why I didn't post this here first I don't know......geezer moment...;-0

6G6

Texas

Fender power to the people!
Apr 28th, 2016 07:44 AM   Edit   Profile   Print Topic   Search Topic

Old Fenders just don't seem to much care.
I don't know if this was by design or chance,
but they seem to be quiet happy with a 100% mismatch.
My guess is that Fender was hoping to encourage people to buy a second speaker cabinet.
A BM on a stack of two 212 cabinets should be a
very serious guitar rig and show them Marshall guys that Fenders can rock 4 twelves as well as they can. ;^D

carsten

on the rhine

Apr 28th, 2016 08:59 AM   Edit   Profile   Print Topic   Search Topic

Hi &g&!

Ha, funny you should mention this - like, the "size wars" of the late 60´s ;-)

I used to own a ´73 Bandmaster Reverb with the big 2x12" cabinet - it looked HUGE and it sounded HUGE, too. Not quite as LOUD as a 4x12", but quite amazing nonetheless ;-)

cheers - C.

Guitar Fool
Contributing Member
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*******

Sunshine State

Just a pawn in someone else's game
Apr 29th, 2016 06:14 AM   Edit   Profile   Print Topic   Search Topic

ok... so yesterday, I was playing through both jacks.....in the 4 ohm mode, Im getting just the 2 Jensen's...

in the 2 ohm mode, the jensens and the 2 8" speakers... have to check #'s to see what brand speaker they are...they came out of an old organ.

the Jensens are RI ceramics, while the 8's are alnico..

the difference between the 2 jacks is slight but noticeable...a bit more volume in the 4 ohm mode through the Jensens, in the 2 ohm mode with all 4 speakers, a bit more warmth, midrange and a slightly softer attack...

man the thing sounds glorious either way... actually im quite impressed with the RI Jensen's...they sound better than I expected

I'll post some pictures in a different thread when I get the new head cabinet....

(This message was last edited by Guitar Fool at 08:15 AM, Apr 29th, 2016)

FDP Forum / Fender Amps: Vintage (before 1985) / Can a BF bandmaster run 2 4 ohm cabinets?




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