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Old 8th March 2012, 02:48 PM   #11
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Join Date: Oct 2011
Location: Arlington
The BHs have been running for about a week now, 10-14 hours a day. The drivers have continued to develop, and they seem to be using the horn now (sound comes out of it whereas before nothing). Overall, there is much more low end, and the highs have mellowed substantially. Those folks that say drivers don't need a break-in, obviously don't know what they are talking about. Like I said, out of the box these just sounded downright terrible.

I did some mods to the cabinets as suggested, and added a plate in the upper chamber about 6" from the front baffle and damped the area behind the driver with polyfill. This eliminated a lot of the hollow treble sounds I heard and gave me a better bottom end. One mod I tried was eliminating the upper chamber by adding a plate tilted forward at about a 45 degree angle toward the driver so what chamber was left, functioned like a mouthpiece. This was cool looking, but I lost some top end, soundstage/space, and even a little LF. Ultimately, it created a veiled, flat response.

I also added wool felt to the sides of the throat as indicated by Scottmoose. There was no negligible change, but left it in place for now because it didn't seem to hurt. I'll let these break in another week or so, seal them up, and make 'em pretty...And as far as the seal goes, I found it's gotta be tight or you will loose LF.
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