MTX
Go to MTX's Website. Look for the Model of your Subs. They have recommended enclosure volumes and simple dimensions for most of their models.
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KillJoy
If you are wanting a "fun" gun, that you and the Misses can shoot with ease, I would look into a 22 Handgun.
A Ruger Single Six or a Walther P22 would be good in this scenario.
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Good Luck!
KillJoy