Bracing questions

[4BangerStanger]

Planning a new enclosure build and could use a little insight. The box will be roughly 25w x 15h x 12d.  Based on my calculations, I have roughly .21 cubic feet to play with.  I was planning a couple window pane braces since the front will be 25" long. Should I also add some braces in the corners?  If so, what would be sufficient?  Would 3/4 x 3/4 mitered at 45 be enough?

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[THATpurpleKUSH 5,000+ posts]

What is the power level you are running?

 

[4BangerStanger]

What is the power level you are running?

More than like this amp Taramp's HD 3000 1 Ohm Class D Full Range Mono Amplifier https://www.amazon.com/dp/B00FGULS78/ref=cm_sw_r_cp_apa_i_WmLXCbQH5MK91 running at 2 ohms. Sub will be a Dayton 10"

 

[THATpurpleKUSH 5,000+ posts]

A window brace with 45s in the corners would be fine.