Quote Originally Posted by Earl K View Post
Rusty,


- As RobH pointed out ( as well as subwoof ) / wire the 3 drivers according to what you see in that schematic .

- As to reconciling the wiring in the posted schematic, to what you and Oldmics have observed / here's what you both need to know ;

"Polarity Checkers are very unreliable devices when used on ( passive or electronic ) "all-pass" networks ( & thats what that Urei network is ) .
- ie; They can give a false reading .

- The delay derived from an all-pass network is frequency dependent ( so all the phase changes go through multiple 360 deg. rotations ) .
- This makes "polarity" a moving target over the operating range of the transducer .

- One typically doesn't encounter this when dialing in a delay on a digital speaker management system ( such as Oldmics typically uses ) .
- One always encounters this phenomenon when using older analog crossovers that offer a simple "delay" adjustment on only the woofer section ( such as I continue to use ) .

<> EarlK
Thanks Earl, I appreciate your explanation.

My only previous experience with a phase tester involved watching someone set up a 4 way studio monitor system that utilized a digital crossover.

First chance I get (speakers are set up at someone else house) I'll remove the 801C and reverse the leads on the mid woofer to match the Urei decal/schematic (the other drivers already do), and reverse the speaker leads, as the preamp inverts phase.

I'll see if I can't talk Oldmics into coming over and doing some tests in the next few weeks.