help with m19 crossover wires

**madman366** · December 2nd, 2011, 05:36 AM

hey everyone my name is dennis and i am new to forum and new altec owner i just picked up some non working non original driver m19s i already ordered new drivers from gpa and they should be in today my problem is i pulled crossover lastnite to clean lpads and make a cap list and some of the speaker leads were not connected nothing seems to be labeled pos/neg i have searched but cant find anything could some one help me out with a picture showing where the correct speaker connections are for both in and output wires i really want to get these bad boys going thanks in advance dennis also they are the stock crossovers with two dials model3 1201-8a thanks again

**Nipper** · December 2nd, 2011, 11:15 AM

This?

http://home.earthlink.net/~jmarkwart...1201-8aRev.pdf

**rontec** · December 2nd, 2011, 05:21 PM

And if you're recapping be sure to check the ground lugs on the 1201 board. After many years oxidation can build up between the lug and the board. A simple wire to connect the ground lugs together will remedy the problem.

**SOOTSHE** · December 2nd, 2011, 05:44 PM

Here's a diagram I made when I pulled my crossover apart so that I could put it back together correctly.
Hope this helps,
John

**Altec Best** · December 3rd, 2011, 12:06 AM

And when your done should look something like this ! Dennis "Welcome to the Board" !

This schematic was provided to me from Todd W. White ! Thanks Again Todd !

**madman366** · December 3rd, 2011, 05:02 AM

thanks for all the info guys got my new drivers last nite i will be hooking them up today i will let you know how it turns out

**timoteus** · December 3rd, 2011, 12:46 PM

And here is a picture of the stock crossover with three black ground jumpers as done at the factory during the last couple of years or so(?) of production.

**juniper** · December 3rd, 2011, 03:13 PM

Can someone tell me why only 4 of the 6 ,connecting pins, are used in Altecs Best's x-over in the above photo on the attenuators? My 19's that have "outboard type" x-overs that sit on the shelf below the horn bypass the stock crossovers, but connect to all 6 of these pins.

**Cal Weldon** · December 4th, 2011, 01:55 PM

If you use only 2 of the pins on a variable L-Pad, it becomes a simple variable resistor so as you increase or decrease the "volume" you are affecting the XO point and slope. I have no idea why anyone would do it this way but hey, I'm no expert.

If you hook up all 3 you are maintaining a constant resistance (impedance) in the circuit and not affecting anything but the SPL of the driver. If you go to the point of buying a ready-made L-Pad, one would think you would make use of it, no?

This has bothered me in the past so I may be sounding a bit harsh but I really don't understand. Perhaps someone can enlighten me.