need help for L100 123A-3 connection

[rutabaga]

hi to all and happy new year

I just bough an L100A pair - the common version - not the late
(black foilcal with Century mentioned )

but there are 123A-3 in place of 123A-1...
( not a problem... and anyway, I have a 123A-1 pair)

My problem :

I found the 123A-3 connected like this : the BLACK wire on the RED post
and the GREEN wire on the Black post...
so I changed it...

Am I right ?

I know the N100 x-over are the same on L100A and L100A late
(thanks the forum)
and I also understood the 123A-1 is a positive transducer
and the 123A-3 is a negative... ( I've tested it with an 1,5V battery)

Thanks to confirm what I think and have done...

both 123A-1 and 123A-3 works and play fine...
I really don't say for now if the 123A-3 is the best...

I think I must let the 123A-1 - anyone has an opinion ?

thanks

rutabaga

[ratitifb]

http://audioheritage.csdco.com/vbull...=123A+polarity
http://audioheritage.csdco.com/vbull...=123A+polarity

(prefer 123A-3 the late version)

[rutabaga]

thanks ratitifb

I 've already seen those posts... but reading it again and better,
now I'm really confused...

bo said :
-------------------------------------------

Here's why I was hoping you could test that 123A-3 for us, and confirm it is NEGATIVE. The following excerpts from the technical sheets of the "L1" and the "L1A Late Model" suggest the -3 is NEGATIVE like the 2213H, since JBL do not advise the need to switch polarity when swapping-in the 2213H.

Anyway, good luck... Attached Images


__________________

-----------------------


So i could be wrong ??? do I have to reverse the polarity when replacing a
123A-1 by a 123A-3 ?
So, let the green wire on the black post and the black wire on the red post ???


to answer to bo :

the 123A-3 moves IN
and the 123A-1 moves OUT

when doing the same test : + battery 1,5 v on RED post
and - on BLACK post

well ...

anybody can help ???

[Zilch]

123A-3 is negative polarity.

If it's replacing 123 A-1, which is positive polarity, you reverse the leads:

http://audioheritage.org/vbulletin/s...ad.php?t=17888

Sounds like it was right when you got it.

[boputnam]

to answer to bo :

the 123A-3 moves IN
and the 123A-1 moves OUT

when doing the same test : + battery 1,5 v on RED post
and - on BLACK post

You get a Gold Star - those answers are correct.

123A-3 is negative (JBL vintage convention)
123A-1 is positive (a strange variant of the period...)

I just bought an L100A pair - the common version - not the late (version)

If that is true, whomever replaced the woofers made the proper wiring connection.

Using the 123A-3 in the L100A should wire GRN to Black post, and BLK to Red post - this will honor the network design. Treat the 123A-3 as you would the 2213H...

[rutabaga]

now it's clear.. really clear...

thank you bo , thank you zilch

In french, we say : et la lumière fut !

(and the light was!)


rutabaga

[duaneage]

Connect a 1.5 volt battery to each system and check the polarity to be sure. They both should move the same direction with red to +, whichever direction that is.

[rutabaga]

thank you duaneage ... I did the test...

they move both out ... in the right direction

(

they rock the house as new