So, I did a thing... 🙂
Maybe I'll call this a "Keystone Light", LOL, as it involves a simplified layout with only one expansion angle. The response at lower frequencies does look pretty close to the Keystone though. At higher frequencies, the shape of the KS mouth and the whole baffle gain thing is going to change the response about 100 Hz, maybe even lower as the baffle step calculation assumes a spherical baffle in 4PI space, and the KS is typically used in 2PI space.
But it's a start. I've left some code in the workbook to try out things like angling the internal panels slightly differently, but I have to troubleshoot that code a bit more to ensure that it's working properly.
View attachment 1474667
View attachment 1474669
NICE model!
Thanks. I've still got bit of work to do on it, as I've got a few ideas to explore. For example, I'd like to figure out if there's any benefit to going with the angled internal panels as laid out in Art's design rather than the simplified layout I provided - and being able to change the sim to easily swap between those two options should show what the resulting differences would be. Art has obviously done a LOT of work on this design, so there's probably good reason for his decision to go with an internal layout that's a bit more complex than what's picture in my BOXPLAN sheet.
I'd also like to see if the sim'd impedance curve is a decent match to the measured impedance curve of a built KS just to see if the model requires any fine-tuning, but I'd need the owner of one to perform the measurement with the KS outdoors and share the resulting ZMA file with me.
Note: for the model I assumed that the expansion to S5 started at S4, which basically translates to the cutout for the mouth starting at the center of the driver. This seems to be reasonably close to how the mouth is located in the KS.
BTW, I've uploaded the current version of the BOXPLAN workbook to my website, just in case anyone wants to have a look. Note that it's definitely not completed yet, but you can mess around with different box dimensions and driver locations to see what the impact on the corresponding Hornresp model will look like. I will likely upload updated versions over the next few days. Location: https://www.diysubwoofers.org/sheets/
I'd also like to see if the sim'd impedance curve is a decent match to the measured impedance curve of a built KS just to see if the model requires any fine-tuning, but I'd need the owner of one to perform the measurement with the KS outdoors and share the resulting ZMA file with me.
Note: for the model I assumed that the expansion to S5 started at S4, which basically translates to the cutout for the mouth starting at the center of the driver. This seems to be reasonably close to how the mouth is located in the KS.
BTW, I've uploaded the current version of the BOXPLAN workbook to my website, just in case anyone wants to have a look. Note that it's definitely not completed yet, but you can mess around with different box dimensions and driver locations to see what the impact on the corresponding Hornresp model will look like. I will likely upload updated versions over the next few days. Location: https://www.diysubwoofers.org/sheets/
Last edited:
Awesome build!!We finally finished two keystone
what drivers you loaded the cabs with?
hey the small boxes next to the keystone looks like the Jbell cubes or CUBOS , what are those ?
do you use them as kicks and did you time aligned them with the keystones ?
and syntrips as tops ?
18sw115-4 with cubo as kick and syntrips as top 🙂. Right now we have a no name fp10000q clone for the keystone but might go the sanway road soon!
We will measure them outside tomorrow and we didn't had the chance to delay the bass stack for tonight, just the top. 🙂
We will build some jmod V2 top when they get released this month
Final setup to have the kick at chest level:
We will measure them outside tomorrow and we didn't had the chance to delay the bass stack for tonight, just the top. 🙂
We will build some jmod V2 top when they get released this month
Final setup to have the kick at chest level:
Last edited:
Nice!!!but might go the sanway road soon!
hey you guys do not have those deal breaker duty fees (Tariffs) that we have in the US
Ohh the JMOD designer is going to release a V2? nice!!We will build some jmod V2 top when they get released this month
hey is there too much BAZZ at the DJ table location ?
why you do not cluster the 2 keystones together for more SPL
- Home
- Loudspeakers
- Subwoofers
- Keystone Sub Using 18, 15, & 12 Inch Speakers