I want to build something new. After some sucessful builds of planet10´s CGR for CHP-70 and Woden Design´s for CHN-50 I want to build something with a bigger driver but still for a smallish place, aproximately 20sqm.
I am quite fond of the looks from the classic golden ratios. The CGR for CHP-70 shall be the model dimension/ratio wise.
http://frugal-phile.com/boxlib/P10free/CGR-dKal-El703-301113.pdf
My idea is to take the general alignment from the "compact vented" one from the Markaudio site. I think its from Scott and fit a slot port on the side.
https://www.markaudio.com/wp-content/uploads/2022/05/CHP90-compact-vented.png
F6=46Hz and FB=46Hz according to plans.
The Volume is Vbox=12,47l and the 40mm round port is A=12,57cm l=12,3cm. I put the data into hornresp and got a frequency graph like this.
F6 is roughly 48Hz and FB 42,1Hz. I have double checked my data but this is what I got in HR.
My slot port should be 14cm wide and 15mm high. To reach the same FB=42,1 it has to be l=20,8cm. This is with a Vbox=13,11l. I had to increase the volume slightly because I upsacaled the CGR ratio by 15% and I want to stay on even numbers. The graphs are not the same but very similar from my point of view.
This is my first time designing a box. There might be stuff I missed or just dont know 🙂
Now my masterquestion. Can I do the box like this? Should this work or is this too far off from the original design?
I know, when using a slot port its adding R to the vent and pushing it more towards aperiodic while decreasing port output.
I attached my hornresp records in case somebody wants to have a look.
What comes to mind that I might change the port ouput which might had helped to fill baffle step losses? Also by placing the driver off centre. But this is just a guess which I can just assume.
I am quite fond of the looks from the classic golden ratios. The CGR for CHP-70 shall be the model dimension/ratio wise.
http://frugal-phile.com/boxlib/P10free/CGR-dKal-El703-301113.pdf
My idea is to take the general alignment from the "compact vented" one from the Markaudio site. I think its from Scott and fit a slot port on the side.
https://www.markaudio.com/wp-content/uploads/2022/05/CHP90-compact-vented.png
F6=46Hz and FB=46Hz according to plans.
The Volume is Vbox=12,47l and the 40mm round port is A=12,57cm l=12,3cm. I put the data into hornresp and got a frequency graph like this.
F6 is roughly 48Hz and FB 42,1Hz. I have double checked my data but this is what I got in HR.
My slot port should be 14cm wide and 15mm high. To reach the same FB=42,1 it has to be l=20,8cm. This is with a Vbox=13,11l. I had to increase the volume slightly because I upsacaled the CGR ratio by 15% and I want to stay on even numbers. The graphs are not the same but very similar from my point of view.
This is my first time designing a box. There might be stuff I missed or just dont know 🙂
Now my masterquestion. Can I do the box like this? Should this work or is this too far off from the original design?
I know, when using a slot port its adding R to the vent and pushing it more towards aperiodic while decreasing port output.
I attached my hornresp records in case somebody wants to have a look.
What comes to mind that I might change the port ouput which might had helped to fill baffle step losses? Also by placing the driver off centre. But this is just a guess which I can just assume.
It is.
There is an extropolation step that needs taking to account for the high aspect ratio of the slot vent. i am not sure if HornResp takes this into account. My modeler does not.
