Hello, I have two questions about the LAs:
1) For the OLA (originally my dad's, I blew up the tweets as a kid 20+ years ago and now decided to restore them), I replaced some '73 tweeters with "later" versions- I read about how the tape does not go all the way across on the "newer" versions as seen in the pic below. But I also notice the positive terminal is now reversed. Was this an actual change in production?
The right pic is one from Audio Karma, looks like a "newer" tweeter with the partial tape and brown glue- and it looks as though the polarity marker was scratched out, which makes me wonder if someone screwed up the polarity markings on my new tweeters.
I plan to check the true polarity by playing some polarity pulses and then visually watching the wave form using a computer based RTA/analyzer program.
2) I've read quite a bit on the Advent stack, including the Absolute Sound article. My question is- what is it about the Advents that make them stack "so well", besides the physical sizes? I haven't tried the stack yet but seems to me another pair put upside down over one pair without any sort of crossover or tweeter adjustment will result in some serious lobing, kind of a fake D'Appolito design with an extra tweeter and midranges too far apart. Does it have to do with the relatively low frequencies the tweeters play? Has anyone done any frequency response analysis on such a set up?
In my search for a second set- I wound up buying a pair of NLAs but haven't fully directly compared the NLAs with the OLAs yet (waiting for another woofer to come in on the OLA, and new caps). I have not tried the stack just yet - as I have not come across another local pair of OLAs or NLAs.