I'm trying my hand at designing some dual 18's based on the B&C 18SW100 drivers but I think I might be in over my head. The design criteria for me is something that will pack into a 90" wide truck on at least two dimensions. For this I settled on 1/4 pack x 1/2 pack. I'm also trying to get solid performance in the mid to low 30's. These will mostly be used for 4-5 piece pop/rock bands in small venues and small outdoor stages for community type events. More and more of these type of events are incorporating DJ's these days so I'm sure I'll have a fair amount of that to deal with too. Finally, I'm taking this opportunity to learn. I realize I can just buy something that has already been thoroughly R&D'd with tuning and processor settings sorted out. I realize that is often the cheaper route as the time involved in the process is often not worth it in the end. I know this going in! With that out of the way, here's what I have so far.
In a somewhat backwards but necessary move, I decided on two of my three dimensions before even looking at a model. I built it up in Sketchup so it would be easier to measure internal box volumes. It also helped me visualize port depths and bracing.
While I'm not overly attached to this B&C driver, I chose it because it's readily available to me. I'm open to other suggestions. The port design I chose is similar to the eighteen sound DIY plan or Clair BT218 where I am using large triangular ports that use the cabinet as a port wall. I don't know how to model the effects of this in software yet. I've been using Bass Box Pro 6 and according to it's model, I have a current Fb of 33.51Hz and an F3 of 43.58Hz. This seems wrong to me. I assume it's an error on my part.
Also of concern is the cone displacement at around 50Hz. It seems quite high to me. I have to believe this driver can perform better than this so I must have my tuning or box volume wrong.
Since my design is a dual 18 with two independent chambers, I found it easier to model just one chamber. Is that a problem?
Can someone tell me if I'm on the right track? Should I just build one and see how it performs in the real world?
I understand what I'm looking at is a raw modeled response with no dsp but I'm not used to looking at it that way.
I've attached all the relevant Info I could including the Bass Box Pro 6 file, the Sketchup model, the B&C spec sheet, and a PDF with the specs and measurements that bass box spits out, plus some renderings for those that don't want to download the zip file.
Thanks in advance!
In a somewhat backwards but necessary move, I decided on two of my three dimensions before even looking at a model. I built it up in Sketchup so it would be easier to measure internal box volumes. It also helped me visualize port depths and bracing.
While I'm not overly attached to this B&C driver, I chose it because it's readily available to me. I'm open to other suggestions. The port design I chose is similar to the eighteen sound DIY plan or Clair BT218 where I am using large triangular ports that use the cabinet as a port wall. I don't know how to model the effects of this in software yet. I've been using Bass Box Pro 6 and according to it's model, I have a current Fb of 33.51Hz and an F3 of 43.58Hz. This seems wrong to me. I assume it's an error on my part.
Also of concern is the cone displacement at around 50Hz. It seems quite high to me. I have to believe this driver can perform better than this so I must have my tuning or box volume wrong.
Since my design is a dual 18 with two independent chambers, I found it easier to model just one chamber. Is that a problem?
Can someone tell me if I'm on the right track? Should I just build one and see how it performs in the real world?
I understand what I'm looking at is a raw modeled response with no dsp but I'm not used to looking at it that way.
I've attached all the relevant Info I could including the Bass Box Pro 6 file, the Sketchup model, the B&C spec sheet, and a PDF with the specs and measurements that bass box spits out, plus some renderings for those that don't want to download the zip file.
Thanks in advance!