B&C 18SW115 Enclosure

Depends on your definition of "move solo".

You’re going to need to pole mount the PM90 for reasonable elevation. If you’re doing that, with an M20 threaded insert in one cabinet end, then add some extra handles on that side and the opposite. You’ll appreciate it, especially if moving things alone.

For a small stack, with lower extension than both the Keystone and XoC1’s TH18 and some variation to other rigs, I’d personally look at this design which has really nice AutoCAD drawings:
https://www.diyaudio.com/forums/subwoofers/232219-325-lab-12-based-pa-tapped-horn-35hz-extension-54.html

Extra details here:
https://www.diyaudio.com/forums/subwoofers/232219-325-lab-12-based-pa-tapped-horn-35hz-extension-55.html

It’ll be relatively heavy, but you get a height of 1.546 metres which is much more friendly for ground stacking with a pallet or stage deck underneath. You can always split the box down the centre line and build them as singles - which also avoids the need for 5’ x 5’ sheets.

You can also leave out the ‘cone correction’ and make all of the corner reflectors simple 45 degree angles.

Changing the external width to be 584 mm probably won’t make much difference to the output, but will make them super van & truck pack friendly. Those are basically the dimensions of a KS28, which is built for touring.

That makes it a pretty easy build.

Edited by toastyghost - 20 September 2021 at 3:51pm

What kind of techno and house music do you play?

osse wrote: What kind of techno and house music do you play? If you play this kind of techno I'd suggest something that's digging deeper than the keystone/th18: https://youtu.be/jM8KEfjLpI0, https://youtu.be/gbLXq-AbzKM If you play lighter house/techno without the deeeep rolling basslines they will work awesomely. I've got a pair of keystones loaded with 18sw115-8 and like to play the really deep techno, it works and plays brutally loud and good but I could easily use 10 Hz lower extension on quite a few of my tracks.  To able to adequately match spl with your tops you definitely need two big tapped horns each side. I think othorn or Skram, if they work with the driver would be good or keystone/xocth18 if you are ok with the higher tuning. Good luck!

DMorison wrote: osse wrote: What kind of techno and house music do you play? If you play this kind of techno I'd suggest something that's digging deeper than the keystone/th18: https://youtu.be/jM8KEfjLpI0, https://youtu.be/gbLXq-AbzKM If you play lighter house/techno without the deeeep rolling basslines they will work awesomely. I've got a pair of keystones loaded with 18sw115-8 and like to play the really deep techno, it works and plays brutally loud and good but I could easily use 10 Hz lower extension on quite a few of my tracks.  To able to adequately match spl with your tops you definitely need two big tapped horns each side. I think othorn or Skram, if they work with the driver would be good or keystone/xocth18 if you are ok with the higher tuning. Good luck! I ran both of those tracks through Audacity and in each case the maximum bass levels are occurring 50Hz and above, with even 40Hz around 12dB down. Do you think that youtube is perhaps filtering out the sub bass compared to the original tracks?

Edited by osse - 22 September 2021 at 8:42pm

The Skram and Othorn are both 21 inch cabs, you could load them with an 18 inch driver but I am not sure why you would do this. I would just build a Th18 or Keystone or something if you want an 18 inch tapped horn. 

In my personal experience, I think sound below 35hz isn't really music, in fact trying to reproduce <35hz can just sound awful with 4x4 dance music. I was doing the sound for a smaller room in a Perth club and the promotor asked me why the main room with a big d&b system sounded so boomy and lacked impact. It sounded a lot like this at 29 seconds - https://youtu.be/5Bzu8xNp5X4?t=29 I just high-passed the system at 40hz in the mixing desk, the system sounded a million times better and the promotor was very pleased. 

It's not that you shouldn't build cabs that can produce low notes, if you do it right it can sound great, its just that I wouldn't make big compromises in pursuit of it.






Edited by citizensc - 23 September 2021 at 2:51am