FE103 - What Port Size?
I posted this in the speaker area but just realized that full range might be more appropriate. Please forgive the double post . . . I've got some cabinets that are 10 1/8" x 13 1/4" x 7 1/2" internal. They originally came with a 5 or 6" full range driver and were sealed. I've got a few versions of the Fostex FE103 . . . one pair of the alnico 10F3, a couple pairs of the RS 1197 versions as well as some similar drivers from vintage KLHs - the 3" that they used fullrange in table radios and as mids in the KLH 5 and even tweeters in some models I think. Anyway, I want to use these cabinets and add a port to the rear. I know these cabinets are a bit larger than the BR cabinets I've seen recommended for these but I want to put something together with them. What size port (diameter? length?) would work well? I'd like to get decent bass, given the limitations. Or would something other than BR work better with these cabinets and drivers?? Thanks . . . Charlie
That’s a .58 cubic foot cabinet so…. According to WinISD the port should be
4” diameter x 4” length… which gives you a giant peak at about 90hz. Sealed starts rolling off at 200hz. Either way doesn’t look to good.
My suggestion is to go aperiodic with this driver in that cabinet for best sound.
Either make one like I did or buy this part:
Much like the way Omega does it but I would use only one ‘vent’ on the back with the 1197.
I would stuff the cabinet loosly with acoustastuff or wool also and bet the speaker will sound very nice.
What About a Smaller Cabinet?
I guess I should have mentioned that the alnico 10F3s are currently in sealed cabs that measure about 5" x 8.75" x 5.75" internally. A bit smaller actually since there is some internal bracing. Would I be better off just leaving them alone? Or maybe adding a port to these cabinets? What about just removing the backs - kind of mini open baffle?? I don't really have the tools/skills to build anything from scratch but I have a few small cabinets lying around. I've got another pair that are 7.5" x 9" x 5.75" which don't have backs at the moment but I could add some and make them sealed, ported or aperiodic. Would any of these options work better? Thanks . . . Charlie
They will all work about the same 'sonically'... they may measure slightly different but should sound very similar.
I like these drivers very much. No tweeter needed either. But i would add a powered sub later on if you can accomodate one.
One driver has a series inductor - usually in the range 2mH to 5mH.
Suggest you wind the inductor yourself and set by ear.
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