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HOW DOES CHANGING THE SIZE OF THE SPEAKER CHAMBER VOLUME AFFECT PERFORMANCE, SOUND, POWER HANDLING ETC. THANK YOU! NEWBY HERE.

Hi Matt. Welcome to the forum!
Unfortunately, I do not know the answer for you.
I was wondering why you are yelling (all caps).

Hey Matt, welcome to the party. I'm Seth. There's not typically a whole lot of "what if" tech talk on this forum. When I first joined the forum a good while back, I had a ton of random curiosities and my thirst for knowledge was high. I wanted to learn about stuff like you're asking too. This particular forum is great to learn about how to choose a design to suite your needs, build, setup, and tune them. Not so much a good place to learn about horn theory. My mind is the type to "what if I..." the heck out of everything. So, I get it. My best advice, and the type of solid advice you'll get here is to follow the plans, build full maximum width or the maximum width you can stow and transport, use one of the drivers that are mentioned in the plans, and build. Following this advice is boring, but will save you countless hours contemplating cab mods and alternate drivers that wont ever make any real impactful difference on your final impression. Choose a cab design, build it to spec, tune the system well, and be very happy. I'd say, if ya wanna mod, mod your second cab so you actually have something to compare it to.

Getting into the fine details of horn design is a topic that falls beyond the scope of our purpose here, which is to help people choose, build and use the right cabs for their needs. If you want to get into those fine details learn how to use HornResp. There are many on line sources to help with that. As to the question at hand, the primary effect of chamber size is reactance annulling, which in simple terms matches the chamber size to the horn and driver parameters.

Thank you all for the replies, I apologize I just saw these. I appreciate the feedback.