@nandappe, now that you've played with MAOP11 + SDDBH - T13.5R has your prior position on ranking it 2nd in line to MAOP10 changed?
SDDBH drawing can be found at the following URL.
https://sites.google.com/view/low-e...iver/-diy-adjustable-duct-type-sddbh-sddbh-ad
https://sites.google.com/view/low-e...iver/-diy-adjustable-duct-type-sddbh-sddbh-ad
I built a pair maybe a year ago with MAOP 11 and they are excellent sounding speakers in my opinion..
Great bass. Very even and balanced sound. The absence of damping material gives them a lively sound with no unwanted resonances despite the lack of damping material.
You can adjust the damping ducts on the back for your room, I like bass so have them wide open but my room is fairly large. I saw a graph from a Scandinavian (Danish?) poster with an in room response which was excellent which confirms my opinion of a balanced sound.
The Damping ducts were new to me but upon further reading they have been around for decades in Japan and have their proponents and detractors but in this case they are adjustable and they do change the response so you have another way of tailoring the speaker to your room / preferences.
The design looked strange when I first saw them having never seen anything similar which is one of the reasons I built them, so as to experience this unusual (to me) design.
The only "drawback" I can see is they take extra effort and material to build but, myself having built so many horns over the years it is not an issue.
Well worth the effort IMO.
I wonder why Dave thinks it is not a great example to copy and am interested in his perspective on this unusual design.
Andrew
Great bass. Very even and balanced sound. The absence of damping material gives them a lively sound with no unwanted resonances despite the lack of damping material.
You can adjust the damping ducts on the back for your room, I like bass so have them wide open but my room is fairly large. I saw a graph from a Scandinavian (Danish?) poster with an in room response which was excellent which confirms my opinion of a balanced sound.
The Damping ducts were new to me but upon further reading they have been around for decades in Japan and have their proponents and detractors but in this case they are adjustable and they do change the response so you have another way of tailoring the speaker to your room / preferences.
The design looked strange when I first saw them having never seen anything similar which is one of the reasons I built them, so as to experience this unusual (to me) design.
The only "drawback" I can see is they take extra effort and material to build but, myself having built so many horns over the years it is not an issue.
Well worth the effort IMO.
I wonder why Dave thinks it is not a great example to copy and am interested in his perspective on this unusual design.
Andrew
Hi Cindra,
I installed various drivers when testing this box.
In my theory, the internal volume required for the MAOP11 is small, but the bass extension and volume are sufficient.
If you prefer tight bass, you may want to use 13.5 rather than 15.5.
It's interesting to try out various things and get unexpected results. We will also gain some useful know-how.
Standing waves are not a concern for this box.
I prefer not to use sound absorbers, but you can try it and make your own choice.
The corners of 1 - 10 and 10 - 11 is better no triangular or square reinforcement.
The box is strong enough, please assemble it so as not to reduce the internal volume.