That's actually how Jim Marshall (who started the Marshall company in the early 60's) designed the first Marshall Quad Boxes, fully sealed, the only time you ever see speaker boxes with holes in them is when they are designed as Hi-Fi speakers, the hole in the Hi-Fi speaker is what's called a Bass Port, it is designed to extend the low-end of the speaker and flatten-out the response, there's actually a good reason for the Marshall Quad Box being sealed, well two reasons I can think of, it increases the power-handling of the speakers, and it also helps to project the sound out the front of the speaker, you also get that low-end resonance that fattens up the sound too.
Jim Marshall once explained that he put the angle on the speaker cab to make it look a lot more neater and also to beam the sound out to the back of the audience, thus enabling the guitarist to be easily heard.
On the other hand, you have amplifiers manufactured by Fender that have speakers mounted in cabinets with open backs, this produces a very different kind of sound compared to the Marshall sound.
Last edited by DrNomis_44; 28-04-2017 at 10:29 AM.
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