Baffle Reducer from 18" to 15"

[bennyg85]

Hi,

 

Does anyone know where I could source a baffle reducer in the UK to convert an old speaker cabinet from an 18 to a 15 inch speaker?

 

I'm all ears to other suggestions!

 

Thanks,

 

Ben

[bertbass]

How about a bit of 1/2" ply the right size and a jig saw, oh, and a drill to drill the fixing holes.

[Bill Fitzmaurice]

If this is just to make use of a box and a driver you have on hand without any expectation of a great result then use plywood per above. But otherwise I wouldn't do it unless loudspeaker modeling software reveals that the box and driver are a good match.

[bennyg85]

Thanks for all your help. A new ply baffle it is!

[stevie]

Be aware that fitting a sub-baffle over your existing baffle will reduce the available space between the driver and the grille. 25mm is normally enough to allow the cone to move without hitting the grille, although it depends to some extent on the driver. If you have less than this, it might be a good idea to do a 'dry run' first, i.e. screw the sub-baffle in without gluing it.

 

If this turns out to be problematic, you can always glue a sub-baffle inside the normal baffle. It can be done, but it's more awkward and you'll need to cut the sub-baffle in half to get it in.

[Dan Dare]

On 31/03/2022 at 14:57, stevie said:

Be aware that fitting a sub-baffle over your existing baffle will reduce the available space between the driver and the grille. 25mm is normally enough to allow the cone to move without hitting the grille, although it depends to some extent on the driver. If you have less than this, it might be a good idea to do a 'dry run' first, i.e. screw the sub-baffle in without gluing it.

 

If this turns out to be problematic, you can always glue a sub-baffle inside the normal baffle. It can be done, but it's more awkward and you'll need to cut the sub-baffle in half to get it in.

 

Or you could mount the new driver to the rear face of the new baffle, which will allow more room for excursion. As the old hole is large enough for an 18, there should be room for the 15 as long as you locate the hole in the new baffle correctly. If there isn't, it shouldn't be too difficult to remove some material (shouldn't need to be a lot) from the hole in the old one.