how did you design the speakers?
Well.. It took me a long time.. I bought the woofers (14 of them) several years ago. I thought Peerless was going out of business and wanted to get them before I couldn't any more.
Then when the dual concentric dome came out I fell in love with it. On paper it looked pretty good. In photos I thought, "Damn that's sharp" but they were back ordered for ever and when they came in stock I ordered 7 of those. I had no idea getting those woofers to play nice with those tweeters would be such a headache.
My 1st mistake was buying all of the crossovers at once thinking I had it right. Maybe I can reuse those coils and caps on something else some day
Then I tried some zobel networks on the tweeter. I couldn't get this squeal sound to go away. Then one day I decided to listen to the drivers separately and realized the squeal was coming from the woofers. I then started swapping parts and found the capacitors I was using along with the order of the crossover was my problem. I then started pricing how much a zobel network for the woofers would cost. When I added it up and weighed the benefits I decided to simplify instead of going overly complex. So in the end I went with a simple coil on the woofers and a 4th order butterworth on the tweeters (I'm sure I'll see some comments on that). Maybe I broke some rules but it sounds best this way to me and those I asked.
The cabinets I used a computer program too plot out. I built a few different versions. Some had tube ports, some MTM's, MMT's, Then I decided to try a time aligned MMT. To me that sounded best. And the slot port sounded much more natural than the tubes. I swear I could hear the plastic from the port!
I also aligned the tweeter on the center. I didn't do it on the rears because of the height of the cabinet with a tweeter on top and also since the speaker is so high up and the tweeter is above the woofer you kind of get the delay on the tweeter anyway.
I have built a few since I was a teenager. These are the best sounding so far.
Let me know if you have any more questions.:thmbsp: