Just beginning to ring out a pair that measure 122x74 cm at the mouth,
straight conical first 2/3, then quasi-tractrix last 1/3.
wow please post lots of details on these when you get going.
Great project !!!
Are you hoping to leave them boxless?
Where do you cross to the CD?
Also curious if you will maybe use a sub(s)?
I've been very interested in the k-402 as a synergy horn, largely because of Chris A's build and other happy k-402 campers in general. Seems like a great horn.
I was going to copy a k-402 clone made into a synergy as posted by Oohms on the Klipsch forums, but I got ambitious and decided to go for an even bigger horn.
Just beginning to ring out a pair that measure 122x74 cm at the mouth,
straight conical first 2/3, then quasi-tractrix last 1/3.
It's crazy the number of small details that go into a synergy, huh?
Very very very interesting!

thx guys
i'll go update my ongoing syn7 thread.....don't want to shift away from ellisr63's awesome project...
i'll go update my ongoing syn7 thread.....don't want to shift away from ellisr63's awesome project...
I decided to make a cabinet for the center (as I figured a cabinet would make up for the gain the left and right had by being in corners, and I was right...we will see how much better they get when they are completely tuned.), and I like the way it turned out so... I will be building a cabinet for the left and right channels too. I am currently waiting to get my amp built, and then I will have Chris A.. tune them for me. Right now I am using a partial tune that was done with them as a open back version. Even the way they are now sounds even better than the open back version did, and it sounded pretty good. I hope to have the amp done early next month followed by 2 more cabinets by the end of August.
Several updates not seen in the pics...
35 degree chamfer on the ports for the woofer size...which gives the angle about 1/8" from the horn to the face of thewoofer side of the pads. I will see if I can dig up a pic of this to make it clearer.
I lined the entire inside of the cabinet with 2 layers of 80 mil of Noiko mat, and then a layer or 150 mil Noiko Red closed cell deadening foam. I used 36sqft of the 80mil to get 2 layers, and then did 1 layer of the 150mil. I am also using the 150mil to seal the removable rear of the cabinet.
I am using a single Speakon 4 connector for the speaker connection, and hockey pucks with felt bottoms for the feet.
View attachment 862018View attachment 862020View attachment 862019
Several updates not seen in the pics...
35 degree chamfer on the ports for the woofer size...which gives the angle about 1/8" from the horn to the face of thewoofer side of the pads. I will see if I can dig up a pic of this to make it clearer.
I lined the entire inside of the cabinet with 2 layers of 80 mil of Noiko mat, and then a layer or 150 mil Noiko Red closed cell deadening foam. I used 36sqft of the 80mil to get 2 layers, and then did 1 layer of the 150mil. I am also using the 150mil to seal the removable rear of the cabinet.
I am using a single Speakon 4 connector for the speaker connection, and hockey pucks with felt bottoms for the feet.
View attachment 862018View attachment 862020View attachment 862019
Attachments
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No problem here.thx guys
i'll go update my ongoing syn7 thread.....don't want to shift away from ellisr63's awesome project...
2nd cabinet was completed today.I will start assembly this next week.View attachment 883177View attachment 883178View attachment 883179

The centet channel cabinet arrived today. I will start the assembly Monday, and when my casters arrive for my rack, I will arrange the rack for the center channel. Once this is done I will be starting on a square version for my surrounds. Pics of the center are on it's side...the speaker will be installed laying down compared to my first 2 (just like most others install it.)View attachment 893681





I have the front 3 channels up and running now. I am now starting on a smaller pair which are being modeled off of the short side of tne k402. I am using bendable plywood and mdf. This pair will be 2' x2'. I never would have even started this build if it had not been for Cnris on the Klipsch forums. His work on the design and help has allowed me to get a speaker that I could make and sound better than I could buy. Hopefully the smaller version will sound as good, as it will be less expensive and smaller.
Everyone on this forum has been so helpful, and I want to thank everyone for there help as even though I went with the k402 The Synergy style is still what I ended up with and I might never have completed the journey without everyones help.
So far I have the bendable plywood held in place on a spare horn with bendable plywood taped to it. I've calculatedthe angles for the mdf and hope to start cutting the first side soon. I am staggering the woofer mounts (which will be a pert of the horn sides) so I could go with 4 woofers if I want. By going this way I think it will make the horn also race the cabinet.
So far I have the bendable plywood held in place on a spare horn with bendable plywood taped to it. I've calculatedthe angles for the mdf and hope to start cutting the first side soon. I am staggering the woofer mounts (which will be a pert of the horn sides) so I could go with 4 woofers if I want. By going this way I think it will make the horn also race the cabinet.
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It has been a long time, but I have 2 clamp molds made, and a bunch of 1/4" MDF being kerfed for the horn and also for the cabinets. plans have changed a little asI will also be making one wood full size k402 in addition to the mini version which will be a 60x60 synergy horn. in addition I am switching over to the Celestion FTR15-3070E as it digs deeper for the bass and it sounds much cleaner for the mids than the Kappa 15Cs do. I also am looking at getting the big boy Celestion AXi2050 drivers for my front 3 channels. I hope to have some prototypes completed sometime this month.
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