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FDP Forum / Fender Amps: Vintage (before 1985) / Speaker impedance question again


USA / Sesame St.

Mar 17th, 2017 09:54 AM   Edit   Profile  

We all know about being able to mismatch speaker impedance on these old Fender amps by as much as 100% and its ok for the OT because the subject has come up a lot over the years.
The jack from the Deluxe Reverb OT to the speaker is wired in 8 ohm parallel and so is the ext. speaker jack. If you have a 8 ohm speaker in the amp and an 8 ohm speaker in the ext. jack at the same time, does it equal 4 ohm and create a mismatch. Is this the same senario as running two 8 ohm speakers wired in parallel in a cab because this woud be 4 ohm load. Not sure if i'm encountering a brain fart right now or what but something doesnt seem right about this.

(This message was last edited by roadhog96 at 12:27 PM, Mar 17th, 2017)


on the rhine

Mar 17th, 2017 11:21 AM   Edit   Profile  

Hi roadhog!

Yes, you have that right - it´s a 4-ohm-load either way.

cheers - C.


USA / Sesame St.

Mar 19th, 2017 09:04 PM   Edit   Profile  

So if you had a 8 ohm speaker in the amp and two 16 ohm speakers in a cab wired in parallel for 8 ohms than you could run all three at the same time because you would have a 4 ohm load total right? It would still be a safe mismatch.

Te 52

Laws of Physics

strictly enforced
Mar 19th, 2017 09:20 PM   Edit   Profile  


Contributing Member

American Patriot

About as ordinary as you can get.
Mar 19th, 2017 09:21 PM   Edit   Profile  

You are correct. One 8 ohm speaker and two 16 ohm wired in parallel, with get you a total of 4 ohms.



Mar 20th, 2017 01:27 PM   Edit   Profile  

I like the idea of having an amp wired so that when you plug in a second speaker, the 4 ohm tap comes into play.

FDP Forum / Fender Amps: Vintage (before 1985) / Speaker impedance question again

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