Active bass module plans (for Directiva and more)

[RickS]

not as yet…



Yes, planning for selectable directivity modes with a front woofer and opposing rear woofer in sealed cabinet.

A correction after reviewing my previous design and cabinets. The cabinet was supposed to be bass reflex. A couple of RS225s in sealed cabinet only need about a cubic foot. This would not be a good match for my existing cabinet.

 

[diyhobby]

A correction after reviewing my previous design and cabinets. The cabinet was supposed to be bass reflex. A couple of RS225s in sealed cabinet only need about a cubic foot. This would not be a good match for my existing cabinet.

Did you make the bass module would like to to know how it came out and what'd you do

 

[RickS]

As I took r2's upper module back towards a more typical alignment, I am currently working on one with the Dayton RSS315HF. Will share more soon.

I also have 2 previous designs. One uses the Dayton RS225 and the other uses dual Dayton ES180s (NLA). Neither of these have as much low bass as I hoped. Once I decided I would alter the upper module, the larger woofer became more feasible. If that does not work, I have designs with larger midwoofers.

Are you trying to match a bass module to the original r2 or something else?

 

[TimVG]

After 3 (?) years. Finally a bass module for R2.

 

[Everett T]

After 3 (?) years. Finally a bass module for R2.

View attachment 463825

Which woofer did you decide on and what is the alignment?

 

[TimVG]

Which woofer did you decide on and what is the alignment?

Wavecor sw182bd03, sealed, in repurposed cabinets. The Wavecor came out great in tests run by an R2 team member, great little woofer and allows for a 300Hz x-over. Since I employ 4 subs, sealed makes sense. Woofer is also placed near the floor to eliminate the floor bounce dip which plagues many setups.

 

[RickS]

While I had plans for using a 12 inch subwoofer driver, it did not fit my repurposed cabinets. So is now dual RS225-8 woofers. This prototype has an adjustable slot vent so I can try various alignments…

 

[TimVG]

While I had plans for using a 12 inch subwoofer driver, it did not fit my repurposed cabinets. So is now dual RS225-8 woofers. This prototype has an adjustable slot vent so I can try various alignments…

View attachment 463829

It's been a while since I modelled it, but if memory serves, the Wavecor much preferred the matching PRs as vents were problematic with regards to port resonance in the audible band. Bottom port with closable plint was in my mind as well (not for repurposed cab but for a fresh build). Keep us posted on the Daytons!

 

[J49]

After 3 (?) years. Finally a bass module for R2.

View attachment 463825

This is sick!!! Did we ever get the plans to build the 2-way monitor the way you made them here (with the router table)? I think Rick posted something but I can't remember if it was complete enough to reproduce or not. Great work, thanks for sharing.

There is another thread on 3d printing small enclosures that I think could open this up to some more people too. Happy to create and share a stl for it if we get complete dimensions.

edit: found it... https://audiosciencereview.com/foru...r2-monitor-prototype-build.30132/post-2121791

 

[somebodyelse]

Did we ever get the plans to build the 2-way monitor the way you made them here (with the router table)?

I don't think so.

edit: found it... https://audiosciencereview.com/foru...r2-monitor-prototype-build.30132/post-2121791

That's still not sufficient to reproduce them - it doesn't have internal dimensions, slot dimensions, or details of the damping material in the slots. Or crossover.
Not meant as a criticism - if you're not ready to share then so be it!

 

[TimVG]

The main issue is that due to the position of the vents, the woofer assembly has a tendency to push the damping material out of place. It took me a while to get the two samples consistent. My personal take is that the vent(s) need to be moved as to allow consistent results with relative ease - but this will require further testing. Then there is the matter of using identical materials which can be tricky since we're dealing with a global audience. I can share dimensions and plans for those who don't care about the current shortcomings. Would recommend however to make your own measurements since slightly different design choices, other details (roundover radius, choice of DSP, baffle step with regards to different bass modules, ..) all add up.