If you do decide to build your own definitely use some plans. I tried a center and some bookshelfs on my own using some high end peerless tweeters/drivers and they didn't end up sounding like I had hoped.
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"Center speaker has been cut, possibly by manufacturer and appears to be professionally repaired with black tape. This appears very professional and might be by design. The tape used is not some cheap electrical tape, but a light fabric-like tape. I assume if you are bidding on this high-end speaker, that you are an audiophile and aware of the origins of the anomaly."