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Small 2-way speakers with linear on-axis and power response characteristics (Scan Speak and SB Acoustics drivers). H&V off-axis measurements included
- Thread starter XMechanik
- Start date
wineds
Active Member
Yes if you want the thd filter you need both. No there's not and easy way to modify the main board.
I could not find the 4.7u or the 5.1u on parts list (page 1). @XMechanik could you add a update parts section for the reduced THD?
wineds
Active Member
Although not official there is one on my GitHub here :
Mechano23-xover/Low_THD_Filter at main · wineds/Mechano23-xover
Mechano23 xover. Contribute to wineds/Mechano23-xover development by creating an account on GitHub.
github.com
miscellaneous_goober
New Member
- Joined
- Mar 4, 2026
- Messages
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- 4
I am working on building a set of these myself, and I figured I would share the Tinkercad designs I made to get the panels cut and machined. Should be exact matches for the original designs (provided I sketched them correctly). Holes for the binding posts on the back panel are 7mm in diameter, for the Dayton Audio BPA-38G Banana Jack Binding Posts. Can export in STL, OBJ, or SVG format, and/or copy and modify the design, just have to sign up for a free account with Tinkercad.
Tinkercad designs:
Front
Back
Sides
Top/bottom
Tinkercad designs:
Front
Back
Sides
Top/bottom
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carbidetooth
Active Member
I suspect a small screw or pop rivet would work just fine. I imagine it's made of ABS plastic, so it could be glued with ABS glue or even wrap the joint with vinyl tape.
Random update on my passive radiator version of this speaker. I originally had the PR loaded with 20g of weight, but always felt like the speaker had a high pass filter on it. I knew I was sacrificing SPL for extension here, but apparently it was too much. Got some free time to remove the weights and all the bass is back. Vcad tells me that with no additional weight my SB acoustics 5x8 PR should give the best roll off. Just a small tid bit to think about if you make a PR version, I would advise not adding too much weight (or in this case any) to whatever PR you use.
OMG that is ingenious! And so simple. Coming to this thread late I hope there is/will be a 6.5" version...I love well done waveguided tweeters, so many advantages.
Hello again, I've just finished up a second pair of Mechano23s for another friend (not selling these btw, I just build for fun). My buddy liked the looks of the Dali Kupid speakers, so this pair was inspired by that design. I'm really happy with how they turned out. As expected, they sound excellent too. Thank you again for sharing your designs XMechanik.
The boxes are 19mm MDF. They are painted and fitted with 3d printed trim panels on the front and back. The port is also 3d printed. Boxes stuffed with 65g of polyfill. Parts cost as of this writing was $332.87usd (excluding MDF, paint, and 3d filament). The paint I've been using lately is Sherwin Williams emerald urethane satin, sprayed with HVLP.
As for the trim pieces affecting the waveguide and/or possible diffraction from the trim pieces; yes its possible, but I couldn't measure a difference. I added a chamfer to the inside of the trim piece around the tweeter to try and match the contour of the waveguide as closely as I could. The trim pieces sit 2mm proud of the baffle.
For crossover check, I imported both the modeled impedance from the VituixCAD project (red) and the measured DATS sweeps (blue) into REW. Pretty close, I 3d printed the port and it looks like the tuning is slightly different.
...and here is both the left and right speakers in DATS showing both speakers are the same
The boxes are 19mm MDF. They are painted and fitted with 3d printed trim panels on the front and back. The port is also 3d printed. Boxes stuffed with 65g of polyfill. Parts cost as of this writing was $332.87usd (excluding MDF, paint, and 3d filament). The paint I've been using lately is Sherwin Williams emerald urethane satin, sprayed with HVLP.
As for the trim pieces affecting the waveguide and/or possible diffraction from the trim pieces; yes its possible, but I couldn't measure a difference. I added a chamfer to the inside of the trim piece around the tweeter to try and match the contour of the waveguide as closely as I could. The trim pieces sit 2mm proud of the baffle.
For crossover check, I imported both the modeled impedance from the VituixCAD project (red) and the measured DATS sweeps (blue) into REW. Pretty close, I 3d printed the port and it looks like the tuning is slightly different.
...and here is both the left and right speakers in DATS showing both speakers are the same
Wow! Lovely!
Can you share the dimensions of the box? I’m thinking about building something similar for some rear mounted surrounds in my room as well.
I am about to build a pair of these and have all the parts except for the ports. I live in Canada and the Monacor MBR-35 seem to be based in the UK and are killing me with shipping prices. Any North American (or ideally Canadian) suggestions? I am happy to modify and cut anything, I am just a bit lost with what port to order and what to modify it into.
Sorry for the dumb question, but thanks for any help!
Sorry for the dumb question, but thanks for any help!
wineds
Active Member
If you have access to a 3d printer the port can be printed. There have been a few port CAD files posted in this thread. One of which is here :
Mechano23-xover/3D Printable port/Mechano23_port_rev6.stl at main · wineds/Mechano23-xover
Mechano23 xover. Contribute to wineds/Mechano23-xover development by creating an account on GitHub.
github.com
ernperkins
Member
- Joined
- Feb 24, 2020
- Messages
- 25
- Likes
- 22
I just received my UMIK-1 and made my first attempt at measuring. As a total beginner with all of this, it's hard to tell if I'm on the right track or if there are any issues.
I would be very grateful if someone with more experience could take a look at my graphs and give me some feedback.These are gated measurements taken with the UMIK-1, and the speakers are, of course, the Mechano23
I would be very grateful if someone with more experience could take a look at my graphs and give me some feedback.These are gated measurements taken with the UMIK-1, and the speakers are, of course, the Mechano23
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- Thread Starter
- #839
It looks quite ok, except that the response in the 2-5k semms to be a bit lower comparing to my simulations and Klippel characteristics.
It's only about 1 dB, but it might be worth checking. Do both speakers have similar behavior in this area?
I put the curves together for comparison, green is Klippel, blue is my simuation:
As @celstark noticed (post #530, link) if the 18/27u caps branch gets disconnected the effect could be similar (but probably much stronger).
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Anyone have recommendations for flush banana plug posts? I bought some dayton posts, but I kind of hate how they protrude out. I think I hate the round inset ones even more. I tried looking around. The GR research ones seem to cost an arm and a leg for no reason. The finish of the plastic gives it a cheap dollar store look too. But those are the closest match to what I want so far. I don't need to have bare wire or spade compatibility at all.
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