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In Reply to: RE: Selaed/Open guitar cabinet? posted by BFB on August 01, 2007 at 10:49:25
All depends on the specs of the speaker. Unfortunately Eminence only says that a sealed enclosure is "acceptable" and doesn't list a recommended enclosure volume. Some speakers are designed to be used in cabinets with open backs, some require closed backs to function within their parameters. An email to Eminence might settle your question faster than anything. As a rule though, sealed cabinets protect the speaker better. You might consider building a cabinet with front ports or a "bass reflex" design (look it up). This would protect the rear of your speaker from punctures by errant cables, microphone stands, or groupies, while allowing you to extend the bass response of the speaker (as ports often do).
Follow Ups:
Thanks. Based on the specs, a 35L sealed cabinet looks good. Q of about 0.7. And that's a reasonable size for a single twelve. I think I'll make it sealed, but leave a door that will open up half of the back if I want the open sound. OTOH, a suitable vented cab. would have to be twice that size, and wouldn't be portable neough.
Being an audio kinda guy I would tend to want to build an enclosure based on the manufacturers' specs. However, most guitarists really don't care about specs and neither do they care about what a pro sound or audio guy would prefer, but rather go by what they are used to. Open back combo amps are the norm and have been for 50 to 60 years, or more, and that "open" sound is what many prefer. On the other hand, players who like the big Marshall tone go for sealed back enclosures that provide more punch.
Also, since we're not really aiming for bass below 100 Hz with guitar, T/S specs really aren't that significant. It's done mostly by trial and error. I really wouldn't want a Q of .7 for electric guitar, in most cases, but it might be nice for a hollowbody where you might prefer a flatter response on the lower end of the tonal spectrum.
In short, my combo amps are open back but I have sealed back extension cabs. Combinations of the two are sometimes interesting. I've seen Mesa cabs with combinations of one twelve sealed and one twelve open back. I've often thought about building a cabinet for electric guitar and experimenting with resistive ports and varying the stuffing. I never seem to get around to that, and I sometimes wonder if it would be worth the effort for the application.
I agree about the technical/aethetic considerations of pro-audio folks/musicians...and how they both contrast with Hi-Fi DIY and audiophile opinion.
The Wizard 12" is the loudest and brightest of the Eminence speakers, and one of the few with a reasonably low Q, so it won't sound TOO boomy in a sealed box. But it will sound more bassy sealed and won't have that nice, delayed clanginess you get from the open box. I'm hoping the thickness will be complimented by the high end forwardness. But I'm definitely going to put the back on with hinges, so it can be lowered.
With a Q of 0.7, the sealed F3 is still a surprisingly high 130Hz, almost an octave above the low 'E' string. Any higher Q/smaller sealed box and I think it would sound too chunky.
If I was going to make a 4x12, I would probably pick the less expensive Legends.
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