mounting flange

[KRD 10+ year member]

on 8" subs are the mounting flange (were you screw it down) from screw to screw pretty much the same? I build my box and I use t-nuts but I do not have the sub i am using.(soundspinter rl-i8) I do have a Memphis Mclass 8 and a RE8. Can I use those for a guide for my screw locals?

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[helotaxi 5,000+ posts]

They might be the same, but the bolt circle could be totally different. Get somone who has one to measure for you.