Mesa 4x12: Standard (oversized) vs Traditional

[stephen sawall]

Anyone using a Mesa OS straight cab ??

 

[metalmm785]

Both trad and OS mesa cabs are great. I have a 2003 Straight/slant OS still that might be my favorite of the ones I have owned. The straight trad I had was awesome as well. I did have a straight OS from 99 that came stock with greenbacks that I absolutely hated though.

I totally agree. My traditional cab came loaded with greenbacks, and I couldn't replace the speakers fast enough (this was mid 2000s). Once I put V30s in, it sounded really good. And I do like greenbacks. I have a Legacy Cab with them, and it sounds great.

I just don't think they work with the way Mesa cabs are built.

 

[Scumback Speakers]

Yeah that looks to be the same method Bogner uses—except they move the doubled connection at the jack down to the speakers to keep it cleaner, but same thing electrically.

They call it series/parallel. But on your website, you call it parallel/series...

Celestion changed their site. I did my drawings 20 plus years ago, and I have them correctly labeled for 2002. 4 wires at the jack is Series/Parallel. Two wires at the jack are parallel/series. I've seen 60/70's Marshall cabs wired both ways.

 

[jchrisf]

Celestion changed their site. I did my drawings 20 plus years ago, and I have them correctly labeled for 2002. 4 wires at the jack is Series/Parallel. Two wires at the jack are parallel/series. I've seen 60/70's Marshall cabs wired both ways.

Great explanation.. that's easy to understand. Would the Marshall Stereo jacks always be Series/Parallel in every switch position/jack since there is 4 wires going to it?

 

[FourT6and2]

4 wires at the jack is Series/Parallel. Two wires at the jack are parallel/series.

I'm not sure I agree with this. Are you saying that scenario A is electrically different from scenario B? Are "Series/Parallel" and "Parallel/Series" simply terms for how to wire the jack and not actually related to whether each speaker in a pair is in series or parallel or whether that pair is in series or parallel with the other?

In Scenario B, the wires were simply moved off the jack, to the speaker solder tab instead. But both scenarios are two paralleled pairs (at the jack), whose speakers are wired in series. Speakers 1 and 2 are in series. Speakers 3 and 4 are in series. And both sets are paralleled "at the jack". But in B, the jack connection is being made at the speaker terminal. Electrically, they are identical. So I'm not sure why one would be Series/Parallell and the other Parallel/Series when nothing has changed electrically...

Scenario B simply uses slightly less wire, it's quicker to install, and it doesn't crowd the jack as much. I'm not too concerned with what Marshall did or didn't do.