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In Reply to: RE: Just make the enclosure out of concrete and be done with it... posted by Tre' on March 09, 2016 at 18:42:56
I coated the outside of my 511's with the stuff used for car undercoating. You can get it at most auto supply stores. After about a month, the smell was gone. Just let them set in the garage while I built my new enclosures. Totally eliminated the ringing.
Follow Ups:
I had always meant to cover my 811s and 511s with the rope caulk since I didn't find much help from the Roofing caulk or cutting the vanes. Ya want to get rid of Altec ringing? Use the B&C DE-250 instead!
The only fault I could find when I built my 4 Pis was a "plasticky" coloration from the Eminence H-290s. The rope caulk tamed that, Wayne came out with the H290C true Catenary horn plus a subtle change to the crossover; I don't play with mis-matched parts anymore.
I'm just offering an alternate suggestion here and not saying my way is better, but an attractive sack such as a nice pillow case filled with fine sand can accomplish mass loading of horns quite effectively. For those of us with a wife, even a very understanding and accepting wife such as mine, I think you will find the WAF factor is better.
As an example of what I am talking about I offer this photo of my HT Tuba subs. There is fifty or sixty pounds of Home Depot play sand in a plastic garbage bag with that garbage bag placed inside the burgundy pillow case. The subs also sit on a sand box containing over 100 pounds of the same sand. More than 100 pounds of sand is also used to mass load the Oris horn and Fostex bullet tweeter rig.
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