Hi
I built a Bass cab and the back rattle,
The Amp is a 5F8-A with 4 x 6550 bias at 70%
The Speaker is a Eminance Beta 15A 300W http://www.eminence.com/pdf/Beta_15A.pdf
dimension of the cab.
27'' x 27'' X 10 1/4''
Contour made with Pine 3/4'' and front and back made with Russian plywood 3/4''
Should I add a Port? And what Seize ?
or, 2 stripe of solid wood on the back pannel each side of speaker magnet + isolating Wool, exemple:onpen cab picture
other pictire is my cab.
Thanks
Need HELP Bass Cab Problem
Moderators: pompeiisneaks, Colossal
Re: Need HELP Bass Cab Problem
I'd vote for ports. Firstly because it is always reported as working well and secondly for physical reasons : the speaker is otherwise working against pressure and it doesn't seems to me that's what we're after.
About the ports themselves. As I see the speaker centered, I guess symetrical ports on each side - and for the ports size... what could be an average value, in between the area of the speaker and what's recommended for the 15" Thiele cab (was that TL606 ? ) - for a rull of thumb example?
These two pic-cents of contribution still remaining to be deburred - or ignored -
(this does not preclude reinforcing the back, though)
About the ports themselves. As I see the speaker centered, I guess symetrical ports on each side - and for the ports size... what could be an average value, in between the area of the speaker and what's recommended for the 15" Thiele cab (was that TL606 ? ) - for a rull of thumb example?
These two pic-cents of contribution still remaining to be deburred - or ignored -
(this does not preclude reinforcing the back, though)
Re: Need HELP Bass Cab Problem
The solution depends on your sound requirements. Closed cab yields a tighter punchy and 'faster' sound. Relieving the pressure with a port goes somewhat the other way - looser and possibly more developed low end.
I use 3/4" BB style plywood for baffle and backs and haven't run into resonance issues yet but I play guitar. If you plan to brace I'd look at multi axis style bracing like an X pattern or a fan pattern. The pic of bracing you show only controls one direction of flex and might not completely solve this issue.
Russ
I use 3/4" BB style plywood for baffle and backs and haven't run into resonance issues yet but I play guitar. If you plan to brace I'd look at multi axis style bracing like an X pattern or a fan pattern. The pic of bracing you show only controls one direction of flex and might not completely solve this issue.
Russ
Re: Need HELP Bass Cab Problem
The Bassman tell me that the problem is really the back panel ripple...
renforcement of back pannel and a small port , together may be the solution.
Side brace may work too
renforcement of back pannel and a small port , together may be the solution.
Side brace may work too
Re: Need HELP Bass Cab Problem
Hi !
I modify the back pannle bu adding 2 brich wood pieces
not test for now , but it might helpfor the FK ripple
I modify the back pannle bu adding 2 brich wood pieces
not test for now , but it might helpfor the FK ripple