watch the stuffing near the port!
Quote:
Originally Posted by SETriode
Stuck some poly fill inside my l100 cabinet today after installing my 104hs and I wasn't too impressed. Perhaps I'll have to start experimenting later, but in this application (where the woofer half of the midrange) i think you've got to pick either blocking the port or stuffin the box with insulation. Polyfill was just too much and all i had left was HF and upper MF, so for right now I'm gonna leave em be and enjoy my new amplifier and midranges. Which if you have an l100 i strongly advise and upgrade to 104h's
If you're trying to run it as a ported system, you have to make sure the airflow through the port on the inside of the cabinet is unrestricted. Allow 3"-4" minimum clear space all 'round the inside end of the port. Same goes for getting up against any of the moving parts of the woofer, including the tinsel leads. Use cheescloth stapled back as appropriate to hold the insulation.
Also, try fiberglass inside of polyfill. It just plain works better. And use only long-strand fiberglass -the short stuff can get into places it shouldn't, like the voice-coil gap-
Filling or stuffing the box adds virtual volume -up to 30-40%, which will tame the peak and lower the cabinet tuning -which helps in either case, ported or A-S.
3 Attachment(s)
L88 Damping, Box Fill. Closed Port.
R21 is high-density fiberglass insulation, 6" thick. It's what I had on hand here, purportedly better than normal density for this. Added benefit is I now have two densities in the box, each presumably optimal over a different frequency range.
Impedance, phase, and nearfield (~1/4") frequency response, before and after installation of fill augmentation.
Black cone 123A woofer:
L46s in an HT environment- benefit from a port plug?
Hi Zilch- not sure if there's enough info available to you to simulate this situation & come up with any opinion, but I've got six L46s slated for my 5.1 surround setup, and since I was at the Depot yesterday purchasing plugs for my L100s, I picked up two 2" plugs as well that would fit a test pair of my L46s.
My thought was that, in an HT environment (where there's some serious dynamics, but a dedicated sub for 80Hz & under), the L46s might have a happier, longer life (suspended animation :D ?) with the ports plugged.
Driver is a 117H-1, not sure of the interior volume of the cab, I'll poke around or take some rough measurements if this intrigues you in the least.
Thanks in advance,
je