DIY cab

[DiMitriR33]

cb was that last one at me?

there is an ideal range for a sealed cab that will extent the bass. maybe not much, too small will definately reduce it, no question. but it will cause a hump in the lower responce. too large may have little negative effect. so yeah your right. it depends on those theile small parameters. and yea a sealed back will always have more bass than an open back.

an overly large cab may be a good thing, guitar speakers are designed for open air. a proper size is more critical in other apps, where speakers can bottom out if the cab is too large.

 

[jackthehack]

Hmm, thought this started out with hooking up a speaker to a 5w head? Seems to have gotten all out of hand? I would posit that you'd have a hard time doing anything more cost effective than buying the matching 1x12 Epiphone cabinet for $129, has an Eminence speaker in it and doesn't sound bad at all. Spaulding - I know you're in North KC, they get these in at  the musciansfriend.com outlet pretty regular you could pick up one for little or almost nothing there.

Look for one of those on eBay or pawn shops, or haunt the same places for cheap empty cabs, or something cheap suitable to replace the speaker(s) in. If you're determined to build your own; Google and there are any number of places to get plans free or for cheap.

As to the looming closed/open/ported/vented cabinet controversy; a closed ported/vented cabinet CAN produce better low end bass response, but again, we're hooking up a speaker to a 5w head, not building reference speakers or PA cabs, and at that power load it's not going to make much audible difference, AND as CB points out, many of the guitar speakers you would want to use aren't long throw and carry specific warnings about using them in such cabinet design(s).

It's all about physics, see the links below; while the a couple of the links are for a car audio site; the equations remain the same and they have online calculators....

Read this book first:

http://www.amazon.com/exec/obidos/ASIN/0790610930/trueaudio

Small-Thiele minimum vent/port diameter equations:

http://www.carstereo.com/help/Articles.cfm?id=21

Butterworth Fourth-Order Vented Speaker Enclosure Design Formulas & Calculator

http://www.carstereo.com/help/articles.cfm?id=17