Guitar cabs aren t built to provide bass extension like a pa box might but they do perform an acoustic function.
Guitar speaker cabinet plans.
As often as not of course amp manufacturers put more than one speaker together simply to help the cabinet handle more power.
Using the thiele small parameters of a typical guitar speaker you will find that halving or doubling the cabinet size makes minimal difference to the response.
See more ideas about speaker cab speaker speaker plans.
Since open back speaker cabs are generally forgiving feel free to modify these designs or come up with one of your own.
You can use these to either make the cab or to get a general idea of what a solid cab should look like.
Primarily the cabinet is a convenient way of housing the speaker so it should be solidly built to ensure no joint vibration unpleasant buzzing and be strong enough to withstand hard use.
For 6 string guitar lowest fundamental is the low e string that vibrates at 81 hz.
The speakers in a cabinet divide the amp s output power between them equally so two speakers that can only handle 30 watts individually band together to blast the full fury of a cranked 40 watt amp while four can handle 100 watts.
Guitar speakers become non linear at very low levels compared to other types of speaker greatly reducing the significance of thiele small parameters in actual speaker use.
When doing guitar cabinets try and select speakers with appropriate qts values that will put the f3 below the lowest fundamental tone produced by the instrument you are playing.