L100 Century polarity

[boputnam]

According to your sheet the 123A-1 would be a negative driver...

You are mis-reading the info.

I have four of them here and they are positive.

It is amongst a very few (2, to be exact) vintage woofers with positive cone motion.

Test the drivers themselves with a 1.5V battery.

+1, er, +1.5!!

Inside the boxes the red connector goes to the red wire that goes to the green wire that goes to the red connector on the 123A

I have four of them, they're all wired this way

Perfect! That is the way JBL designed and built them. You are good to go!

btw, 1 MILLION points to "Eaulive" for doing extensive searches before posting! He resurrected a 2003 thread. Yeah - the system is cumbersome but it is working!

[Eaulive]

btw, 1 MILLION points to "Eaulive" for doing extensive searches before posting! He resurrected a 2003 thread. Yeah - the system is cumbersome but it is working!

Maybe it's because I'm a moderator on another heavy traffic forum, so I know how irritating it may be when somebody opens a thread on a subject treated some days before .

[Eaulive]

You are mis-reading the info.

Misreading no, misunderstanding maybe
According to the cheat sheet:
L-100 / 123A-1 / + to - / LF cones moves out.

Mine are wired + to + and LF cones moves out.
It's expected, but then I don't understand the cheat sheet

[boputnam]

Mine are wired + to + and LF cones moves out.

As it should do.

...but then I don't understand the cheat sheet

OK.

[Eaulive]

As it should do.
OK.

Care to explain?

[boputnam]

Sorry - missed this.

The L100 had a number of variants, as you know. All were wired so the woofer moves out on (+) signal. This was a departure from predecessor cabinets. The 123A is unique.

If you mean the GRN is connected to the Red terminal, that is how it was designed and the cone will move out.

[roadiemanchild]

My D130 also is a (-) for outward cone excursion. Or reversed polarity. Ya gotta check those or you find yourself doing it again and properly the second time.