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Speakers wiring - Out of phase?

 
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rufes
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Joined: 16 Jan 2014
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PostPosted: Thu Jan 16, 2014 2:44 am    Post subject: Speakers wiring - Out of phase? Reply with quote
I have read that Dumble used to wire the speakers in some of his cabs out of phase (polarity inverted). Is that the case with Robben's cab?

Thanks Smile
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tboulette
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Joined: 13 Aug 2011
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Location: Maine, USA
PostPosted: Thu Jan 16, 2014 9:12 am    Post subject: Reply with quote
Never heard that. It would be very odd -- having speakers out of phase with each other is not something you'd ever want.
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rufes
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PostPosted: Thu Jan 16, 2014 9:27 am    Post subject: Reply with quote
By Out of phase, I mean that the global polarity is inverted.

Once you've got both speakers wired, there is one + and one -. If you connect the current from the amp the opposite way, the speakers will vibrate the opposite way too. You can google a lot of literature about this.

It is presumed that the sound will not be altered but some people says it does. Dumble used to wire his cabs this way. (that's what I have read....)

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tboulette
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PostPosted: Thu Jan 16, 2014 9:45 am    Post subject: Reply with quote
Oh, I see. Personally, I can't imaging it makes a difference (provided you're not also using another amp that's in phase). But, some people swear that these things really do matter. Makes me glad I don't have "golden ears".... Smile
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rufes
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PostPosted: Thu Jan 16, 2014 3:34 pm    Post subject: Reply with quote
yes Laughing

I was going to wire a 2x12 cab and I was just trying to get some ideas but I finally wired it the standard and "correct" way.
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tboulette
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PostPosted: Thu Jan 16, 2014 6:00 pm    Post subject: Reply with quote
You might try installing a phase switch, and then you can try it either way (being sure to switch off the amp before changing it, of course).
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PierreL
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PostPosted: Fri Jan 17, 2014 6:53 am    Post subject: Reply with quote
On some Dumble inspired amps, the ones with reverb (Fuchs, Two Rock etc.) , the polarity of the cab has to be reversed .
From Two Rock's website :
Quote:
Speaker Cabinet and Combo Wiring:

Care needs to be taken when installing new speakers or adding other manufactures cabinets to our amps. All of our amps that have reverb have a reverse phased output section. What this means is that the signal is in the negative swing as it leaves the amplifier. Traditional wiring of speakers takes the “+” positive terminal and connects it to the tip of the speaker jack, and the “-“ negative terminal and connects it to the sleeve of the speaker jack. When the speaker gets the signal in this configuration the speaker will push first and the pull. If the wiring of the cabinet is “Out of Phase” with the amp then the speaker will pull first and then push. We wire all our cabinets and combos that pair with our reverb amps with the “-“ speaker terminal going to the tip of the speaker jack and the “+” positive going to the sleeve. This way the signal that is in the negative swing as it leaves the amp see a negative polarity at the speaker. Causing it to push first and then pull. Making sure that the amplifier matches the cabinet will result in the amp/speakers working together. This will increase the dynamic range and tone of the system. It will not hurt the amp to have the speaker running in an opposite polarity then the amp. It will just sound slightly muffled and not have the headroom. Amplifiers that have no reverb will want to be wired in the traditional manner.


And it does indeed make a very noticeable difference.
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Linville
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PostPosted: Thu Jan 23, 2014 11:44 am    Post subject: Reply with quote
OK, Im a bit of a idiot, but I have a '65 Twin RI, it has a reverb tank, should I change the way my speakers are connected?
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PierreL
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PostPosted: Thu Jan 23, 2014 2:44 pm    Post subject: Reply with quote
Actually I don't think so, I think this applies to Dumble type amps (but I am not 100% sure).
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