Riffing on the BC112 cab build.

[Hacksawbob]

I am on a tight budget for a 112 build for rehearsals mainly but also in conjunction with the 15" cab I built

I had some left over 18mm ply from a flooring job I did on my house. I have 2X emminence Kappalite 3012HO kindly donated by @verb which I have finally got around to using. https://eminence.com/products/kappalite_3012ho

the dims are H600XW400XD300mm (weight is about 15KG as it stands)

I used 30mm baton frames for support around the front and back panel (height and width) corners. I got thrown together in a day and now for the hard part!

port, I still have some flared port adapters that I 3D printed for 110mm waste pipe

win ISD reckons if I tune for 40Hz i only need a 28mm of 110mm pipe. I have to admit I'm getting out of my depth here with WinISD 

 

As I dont have internalwindow type horizontal  bracing that the original BC112 has (just two picture frames front and back)i want to retain as much of the baffle material as possible for stuctural rigidity.

So compression driver on the front, port on the rear.

 

I have a celestion CDX1 1746 which I could use, although it is a beast at 2Kg  https://celestion.com/product/cdx1-1746/ 

Or do i bite the bullet and get the 1425 compression driver specced in the original and run with that,

Could I use the crossover design for the BC112 with either of these drivers? again I'm getting out of my depth with this stuff! I've attached the winisd file if any build guru fancies stepping and putting me on the straight and narrow I'd appreciate it!  @Phil Starr @stevie @Chienmortbb

 

 

50L box tuned to 40Hz with a 110mm vent

 

Kappalite 3012HO.wdr

Edited December 5, 2024 by Hacksawbob

[Pea Turgh]

Ooh I love a good cab build!  Are you doing a round over?

[Hacksawbob]

It's a bit screw bound for a router, things can get spicy! They might come out I suppose, it would look a lot nicer.

[Pea Turgh]

If it’s glued too, yeah pop the screws out to round over, then put them back in afterwards.  Or glue and dowel.  Those corner protectors would sit nicer then, too.

[Hacksawbob]

yep sounds like a plan, I'll get it sounding right first though!

[Phil Starr]

On 04/12/2024 at 10:55, Hacksawbob said:

Could I use the crossover design for the BC112 with either of these drivers? again I'm getting out of my depth with this stuff! I've attached the winisd file if any build guru fancies stepping and putting me on the straight and narrow I'd appreciate it!  @Phil Starr @stevie @Chienmortbb

I don't think you can use @stevie's crossover design as it was specifically designed for the two drivers he used. Without giving too much detail he desings by having a target frequency response for each driver so they can be integrated smoothly. Having designed them using theory he then measures to response and repeatedly modifies the high and low pass filters until both do exactly what he wants. He then runs more tests to see that they integrate the way he wants. The  Eminence  3012HO has a very different response around the crossover frequency to the Faital driver he designed for. Having said that very few if any manufactured musical instrument cabs go to such trouble so you acn get a workable result by using a proprietry crossover or by building a crossover based upon classical theory. There are online crossover design programs which will calculate the values for you. I've been happy with the results of these designs in the past