New BassChat 8"Cab design

[Chienmortbb]

  On 16/10/2024 at 10:12, Phil Starr said:

  On 16/10/2024 at 09:11, Chienmortbb said:

 

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I was thinking that the random bass playing from the hall was louder than I was for some of the time

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Random may be too kind for some of our playing...

[Phil Starr]

Snatched a few minutes to finish the cab build from the bass bash. A few minor faults caused by rushing things as I was talking  but nothing a bit of filler won't sort . Hopefully it can be filled and painted this weekend.

 

[DGBass]

@Phil Starr, I see your cab build has what looks like cross bracing inside between the top and side panels. I didn't see this on the original build diagram. Is this a late revision and if so, were they just glued in place and do the two braces connect where they cross? What wood did you use for the braces? Cheers, DG.

[Phil Starr]

  On 26/10/2024 at 15:00, DGBass said:

@Phil Starr, I see your cab build has what looks like cross bracing inside between the top and side panels. I didn't see this on the original build diagram. Is this a late revision and if so, were they just glued in place and do the two braces connect where they cross? What wood did you use for the braces? Cheers, DG.

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Well spotted, the original cab which was cube shaped had no braces and that is what we have tested. It's a simple matter to cross brace the panels and I had some off-cuts which were exctly the same dimensions as the panels. The ones in the photograph are just a tight push fit and i will stick them in when I fit the speaker. I'll do a final write up of the build and discuss bracing and damping the cab there. If you are going ahead with the build before I reach that point then simple cross bracing like this is almost impossible to get 'wrong'

Edited October 26, 2024 by Phil Starr

[Phil Starr]

Better pic tomorrow but it's painted and working

[Chienmortbb]

Nice work Phil. 

[bremen]

  On 26/10/2024 at 16:34, Phil Starr said:

Well spotted, the original cab which was cube shaped had no braces and that is what we have tested. It's a simple matter to cross brace the panels and I had some off-cuts which were exctly the same dimensions as the panels. The ones in the photograph are just a tight push fit and i will stick them in when I fit the speaker. I'll do a final write up of the build and discuss bracing and damping the cab there. If you are going ahead with the build before I reach that point then simple cross bracing like this is almost impossible to get 'wrong'

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Top tip: rout a 6mm slot into the panels. Fill with foaming flooring adhesive

 

https://amzn.eu/d/frLAMMw

 

5.5mm ply bracing then fits snugly and is going nowhere.

 

 

[Chienmortbb]

  On 28/10/2024 at 08:59, bremen said:

Top tip: rout a 6mm slot into the panels. Fill with foaming flooring adhesive

 

https://amzn.eu/d/frLAMMw

 

5.5mm ply bracing then fits snugly and is going nowhere.

 

 

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Are you suggesting this purely for the bracing? Most builders stoped using that type of adhesive for cabinet edges some time ago. 

[Phil Starr]

On the subject of bracing: I eventually settled on a single horizontal brace placed centrally in the side panels. The vertical brace was too close to the port and placing it off centre didn't really add to damping the panel resonance. Placing the horizontal brace centrally shifted the resonance up an octave as you'd expect but on a simple tap test reduced the resonace considerably in volume. The cab sounded fine with no bracing too but the cross brace was a simple addition so I left it in

[bremen]

  On 28/10/2024 at 09:06, Chienmortbb said:

Are you suggesting this purely for the bracing? Most builders stoped using that type of adhesive for cabinet edges some time ago. 

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Yes. It's probably not as strong as pva but it holds the bracing nicely in a slot.

[nekomatic]

I've just received a delivery from Blue Aran, so watch this space for a build!

 

edit: under way!

Edited January 23 by nekomatic
link to build thread