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I have my old q logic box for my 10s in my basement, its a little bit bigger (volume wise) than the box for my 12s and i was wondering what would be the easiest way to make my 12s fit in em? I have a dremel with the little sanding bits, dunno if that would work or not, or should i just get sandpaper and sand away?

depending on space, you are better off making a baffle to go over the original 10" spot... other than that i usually use a jig saw to make my cuts bigger and a rasp.. (dont have alot of tools at hand, so i make with what i got.)

If you have a router you could use it, but if not I would recommend a saw of some kind, a jigsaw like Scarrell said or a coping saw could be used also. It would take some time to sand it all by hand.

make sure you have room to screw the sub in... my brother did this and when he went to screw the 12" in he found himself drilling into the top and bottom peices of mdf and splitting them.

I like the sanding idea, let me know in a few years how it turned out. No Scarrel is right, you can put a peice of 3/4 over the front of the box, or if the box is big enough you can just cut out the holes bigger. IMO a jig saw would be your best bet for cutting out the holes.

Oh man ive been there and done this a bunch of times it really takes forever just to sand even with a palm sander, and the rasp Idea, no offense is not a good idea on MDF cause the coarseness of the rasp will just split and break up the wood. The Jig is a good idea, coping can work but it takes forever, i would say use a router around the edges, and if u do go the Baffle route it is a good idea to pre-drill your holes before you screw in to prevent splitting.

im gonna go look at it today, i dont have a jigsaw or a router, and i doubt i could make a good cut with either so ill probably end up using my dremel and sanding bits.

Good luck im sure if u take ur time u will be fine, personally i can be very impatient when i dont have the right tools, and thats about all the time with me but im sure it will be good if u just put ur mind to it...