enclosure bracing

[conceptzaudio 0]

hello hello. ive just built box for (2) Nightshade 15's, its tuned at 33 hz and really gets down.. im trying to brace my box and dont wanna take a chance of screwing up my tuning and overall eclosure. my box measures 49x24x20. with a port opening of 18.5hx8.5t. i guess im seeking advice on placement and what exatly would be the best to use. my face is doubled and my overall box is 1.25 thick.

[BenHemp 1]

Adding a little bracing to the inside of the box using dowel rod or threaded rod isn't going to have much of an effect on your tuning. Show pictures of the box.

[Impious 1,476]

The change in volume and tuning due to some bracing won't be audible. I wouldn't worry about it unless you are chasing tenths on a meter, even then the change could end up being negligible.

[Julian 641]

Personally all thread would be the best and the reduction in internal volume wouldn't change.