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The Graduates

Posted 18th May 2016 at 01:31 PM by G Speakers

Thought I'd give this blog thing a try.

I'm building a pair of bookshelf speakers for my wife as a gift. Don't worry, it's not one of those bowling ball gifts that's really for me. It will come with a record player and a few records of some of her favorites.

I recently found out my speaker configuration is actually a popular design by Carmody. Which makes me feel good about my choices, but also sets the bar high for me.

The baffle is a 1" thick walnut/maple butcher block look, with 1/2" baltic birch for the rest.

I made the mistake of comparing my PCD7 prediction with his. I noticed they are nothing alike. I got worried so I went back and re did my measurements to make sure I wasn't in a weird spot or getting a reflection. Even moving the mic all over I was pretty impressed with the consistency. The issue was - diffraction. Like 10dB of it. I beveled the corners, but it's still only a 6" wide baffle.

To make sure - I used Bagby's Response Modeler to look at the predicted diffraction on this baffle and whadayaknow - it looks just like my measurement. So the XO took a little more time than I thought, but I think I'm ready to buy some parts and see where this thing lands. I'll keep you "posted".
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