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FDP Forum / Fender Amps: 1985 - Current / PRRI speaker polarity

Stratrocker
Contributing Member
****

USA

good welder, crappy guitar player
May 21st, 2017 07:27 PM   Edit   Profile   Print Topic   Search Topic

The twin-lead wire that goes from the back of the amp to the speaker has one of the wires marked with a red stripe. Should this go to the positive (+) or negative (-) connection on the speaker? Thanks.

Hammond101
Contributing Member
**********

So. Cal. USA

May 22nd, 2017 04:45 PM   Edit   Profile   Print Topic   Search Topic

I would assume the PRRI has a 1/4" plug/jack set up at the chassis like an original, yes?

If so you could unplug it from the amp and insure if the red stripe wire is in fact connected to the positive terminal of the speaker it is connected to the tip of the 1/4 plug.

A VOM set in continuity mode would be the best tool for this purpose.

Stratrocker
Contributing Member
****

USA

good welder, crappy guitar player
May 22nd, 2017 05:13 PM   Edit   Profile   Print Topic   Search Topic

"I would assume the PRRI has a 1/4" plug/jack set up at the chassis like an original, yes?"

Well, to be honest, I've never owned an original, but I'm going to say yes. :)

carsten

on the rhine

May 23rd, 2017 04:25 AM   Edit   Profile   Print Topic   Search Topic

Hi Stratrocker!

Yes, the "marked" wire should go to "+"!

cheers - C.

Hammond101
Contributing Member
**********

So. Cal. USA

May 23rd, 2017 09:44 AM   Edit   Profile   Print Topic   Search Topic

Trust but verify! I've seen this bass ackwards!

amphead4

Cincinnati, USA

May 24th, 2017 07:26 AM   Edit   Profile   Print Topic   Search Topic

I've seen lots of arguments here in the past over which way sounds better.

Hammond101
Contributing Member
**********

So. Cal. USA

May 24th, 2017 09:39 AM   Edit   Profile   Print Topic   Search Topic

IMO, it is only an issue when adding extension cabs. Polarity must be correct.

Peegoo
Contributing Member
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I've got my own

double-cross to bear
May 25th, 2017 11:46 AM   Edit   Profile   Print Topic   Search Topic

Yeah, if using the internal speaker only, speaker polarity does not matter because the speaker receives an AC signal.

Stratrocker
Contributing Member
****

USA

good welder, crappy guitar player
May 28th, 2017 07:45 AM   Edit   Profile   Print Topic   Search Topic

Just out of curiosity, what would happen if you did add an extension cab and had the polarity reversed on it?

Peegoo
Contributing Member
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I've got my own

double-cross to bear
May 28th, 2017 08:28 AM   Edit   Profile   Print Topic   Search Topic

Your speakers would be out of phase and there would be a noticeable loss of (usually) low mids.

The reason is because as one speaker is pushing forward, the other speaker would be pulling backward.

This causes attenuation of certain frequencies; the frequencies that are cut are those wavelengths closest to the distance between the speakers.

Stratrocker
Contributing Member
****

USA

good welder, crappy guitar player
May 28th, 2017 04:38 PM   Edit   Profile   Print Topic   Search Topic

I love this place. :)

Peegoo
Contributing Member
**********
**********
******

I've got my own

double-cross to bear
May 28th, 2017 08:38 PM   Edit   Profile   Print Topic   Search Topic

It's how I learned this stuff, brother: asking lots of questions :o)

FDP Forum / Fender Amps: 1985 - Current / PRRI speaker polarity




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