Here I am finishing the rear enlosure, I put some 1"x2" around the edge of the mdf so I have something to hold the screws for the removable cover better then just the mdf.
Here is a closer look at the dome tweeter that I am using, it a buyout from PE #279-051.
Here it is mounted on the horn with some electrical tape to help smooth out where the driver frame meets up with the horn.
I tried playing around with the crossover but I don't get a lot of flexability with the crossover point as the rolloff of the mids/high limits it. It's kind of a mess but you can see here the raw driver FR along with the FR of the drivers with crossover. This was measured indoors about 1m from the horn.
You can see that the mids are not anything that could be called flat, High frequency is not too bad but overall not very good sounding.
This is how it sat for about four months in my basement while I moved on to other more sucessful projects.
Recently I started playing around with it again, I tried a dayton silky in it which did not turn out any better, I would even say it sounded worse.
Likely because the dayton did not have as smooth a match to the horn as the roundover on the faceplate of other tweeter did.
Then I decided what would happen if I ported the mid enclosure into the horn?
I also made the front mid chamber ports larger becuase I could not get to the backside with a router and use a chamfer bit to shorten them.
What it did to the FR:
Much much better, and I can highpass at 80-100hz and let the subs take over. I have it running right now on a simple second order crossover for both the mids/high at about 1100hz. I set it up in a small room where I padded the tweeter to taste which when I measured it came out to about 6dB under the mids:
And here is a video of me anoying the neighbors with it in the backyard
I am about 50 yards away before I start walking up to it.
The two DIY folded horn subs below it use a 8" Dayton DVC driver, and are powered by a Dayton APA-150.
The synergy horn is being powered by a Yamaha HTR-5450. It was crossed over at 90hz to the DIY horn subs, I did not have the crossover on the subs set up right 60hz lowpass so there was a large dip between 70-100hz.
The total cost was <$50:
sony mids: $0.69 x4
crossover parts : $18.54
Mdf and other material: $15-20
Now I just have to build the second one.