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Section (2) 4 x 15 Cabinet, 4 x 10 Cabinet, 2 x 18 Cab, 2 x 15 Cab, 4 x 12 Cab, 2 x 21" Cab. Cabinet Prototypes.
After much research and development, it was found that depth of cabinet produced depth of bass.
An intrinsic design feature of cabinetry, for the reproduction of bass guitar, especially 5 string bass guitars, totally unlike traditional 4 string basses, it was found that depth of cabinet had a lot to do with the reproduction of the bass frequencies and low end response.
I experimented with 1 x 18's, of the 4 x 12 size bass guitar cabinets of the traditional HiWatt and orange and Marshall configuration, and it was found with acoustic dampening material, covering most of the inside of the box, that a shallow depth cabinet of the 4 x 12 size, in fact housing a 1 x 18 speaker, took out all of the woof and elongated ring-on of deeper 1 x 18 cabinets, like Trace Elliott 1 x 18's.
This shallow cabinet of a 4 x 12 size, but in fact housing a 1 x 18 full-range bass driver, was very articulate and very expressive, but had very little low end to speak of.
Experimentation found that by having a smaller front to a cabinet housing a 1 x 18, and greater depth behind the cabinet, produced clear articulate bass, just like the 1 x 18 cabinet that was traditional HiWatt shape, just like a 4 x 12, with the added design feature of greater depth behind the cabinet.
BINGO! The result of the clarity of 4 x 12 size, and the bottom end of a deep cabinet.
I had been through a vast amount of speaker cabinets and amps in my life, always interested in what produced the sounds that attracted you to that particular cabinet you were working with at the time, but also what it lacked and why this was the case.
I tried endless configurations. Every single cabinet produced for bass. Scoop front loaded bass bins, like Michael Antony's first Van Halen 70's rig, 4560's, 4580's, Fender cabs, Marshall cabs, HiWatt cabs, Orange cabs, early Laney 4 x 15 cabs, Martin bins, acoustic 360 bins, acoustic 301 bins, Turbosound, TSM 115's, Turbosound 2 x 15's, function 1 cabs, you name it, I was going to stick different speakers in them, and try them with different amps till the cows came home.
Research found that small surface area to the front of the box, with depth of cabinetry behind the speaker, with porting, produced the results thus far looked for, with acoustic coupling.
The acoustic coupling of the 4 x 15 cabinet really handles the 5 string bass guitar, especially active 5 string bass guitars, as well as passive 5 string bass guitars.
The speakers that I have found that were available easily, without endless nonsense from suppliers and manufacturers, were Celestion and Eminence in England.
This may be a different situation in the USA, or Europe.
The 4 x 10 small front deep box is a fantastic 4 x 10 for a small gig bass player.
The 4 x 15 small front deep box is a fantastic all round cabinet for anything.
The 4 x 12 small front deep box is a fantastic box also, but harder to find bass drivers for.
The 2 x 21" small front deep box is utterly outrageous low end.
The 2 x 18 small front deep box is a fantastic low-end cabinet, a bit like youths Peavey rig in Killing Joke, the old Peavey 800 heads with 2 x 18 plus 2 x 10 in one box. They did make a 2 x 18 only that was absolutely fantastic cabinet, much favoured and sought after by some heavy metal bass players from the USA, because of the monstrous low end.
All of these speaker boxes have acoustic coupling of more than one speaker in pairs, or in bigger configurations. It was found that each speaker works extremely well in its own container inside the cabinet, so in laymans terms, each cabinet has its internals divided up as per speaker.
It was found that two drivers in one air space, or box, had a strange phenomenon, of that the left hand driver, sharing the air space with the right hand driver, thought that the entire air space was just for itself, and vice versa for the right hand driver, also thinking that it had the entire air space all to itself. Then, tuning the cabinet, by moving the back baffle up and down the cabinet's depth, in order to find its optimum function.