Normal
Right, in that case you'll be better to get the tuning frequency down to the lower limit (or just below) of the range you'll use it in. That will allow more excursion with your normal program content without risk of excessive excursion from content lower in frequency than your tuning frequency.If you want to get down to say 25Hz, your 10.1cm port would need lengthened to about 52cm long. As that's likely to be longer than the depth of the cab, you'll need to put a bend in - ordinary plumbing pipe may be a good source of such a bend.
Right, in that case you'll be better to get the tuning frequency down to the lower limit (or just below) of the range you'll use it in. That will allow more excursion with your normal program content without risk of excessive excursion from content lower in frequency than your tuning frequency.
If you want to get down to say 25Hz, your 10.1cm port would need lengthened to about 52cm long. As that's likely to be longer than the depth of the cab, you'll need to put a bend in - ordinary plumbing pipe may be a good source of such a bend.
