DIY Klipsch Heresy Baffle Seal

10 Sep

In light of the recent coverage on Klipsch Heresy capacitor replacement, I’d like to follow up with an even easier upgrade for your compact, sealed wonders that costs about $5 and takes less than 5 minutes to install.

Let’s first look back at the term “sealed.” The Heresy got its name because it was such a radical departure from the previous designs of Paul Klipsch, which revolved around large, ported cabinets, 15″ woofers and folded bass horns to improve low frequency response. With the Heresy, Klipsch broke many of his own design principles, achieving quality, full-range sound from a relatively small, sealed enclosure, housing a front-loaded 12″ woofer.

Now I can’t speak for the second and third generations of Heresy cabinets, but the original boxes have a removable rear panel, secured with eight Philips head wood screws. The panel simply butts up against a 3/4″ strip of wood around the perimeter of the box interior. While this does secure nicely when screwed down tightly, I’m skeptical of the wood on wood air tight-ness–an important detail for a sealed speaker design to adequately reproduce low frequencies.

Here’s the part where you go to the local hardware store and pick up some foam weatherstripping like you would use to eliminate drafts from door jams and window frames. You’ll need at approximately 136 linear inches of the stuff (11′ 4″) to seal one pair of speakers. It comes in several different widths. I chose the 1/4″ variety, which in reality is closer to 1/3″ wide. If you wanted to really go for overkill, you could spring for the 1/2″ or 3/4″, but the wider you buy, the more you should plan to spend. It does spread out in width a bit when compressed, so I feel the 1/4″ stuff does the trick. It also fits nicely between the edge of the cabinet and the existing screw holes.

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Application, just pull the tape off the adhesive backing, apply a strip of the weatherstripping around the perimeter of the cabinet and replace the rear panel.

Don’t expect a night and day difference, but those who know the Heresy will welcome any help in the LF department. The expansive properties of the foam also apply pressure against the back panel, helping keep the screws tight and eliminating possible vibrations and rattles in the rear baffle.

Just another step to ensure your Klipsch Heresy speakers are operating at their highest potential for many more hours of listening pleasure.

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