| One more time [message #64675] |
Sat, 13 November 2010 22:22  |
steve f
Messages: 236
Registered: May 2009
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Master |
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Wayne,
Sorry, but I need to bother you one more time. Because of space restrictions, I was going to build a pair of 2 PI speakers set sideways. Trouble is, I love the CD of your horn loaded models. I don't want to give that up. The big question is "Has anyone tried to build a sideways mounted pair of 3 PI's?" Will that work? Low frequencies have sub reinforcement in my room.
Steve
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| Re: One more time [message #64728 is a reply to message #64727] |
Tue, 16 November 2010 15:02  |
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Wayne Parham
Messages: 18682
Registered: January 2001
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Illuminati (33rd Degree) |
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I'm sure you can make it work, it's just not a slam dunk like it is with smaller boxes. Of course, smaller boxes trade-off extension or efficiency or both. So I'd rather deal with the added complexity of making sure the standing waves don't lump up around the port.
I think it makes sense to use the two π tower as a starting point, but you'll probably have the midwoofer and tweeter packed pretty tightly up top. It won't fit, to tell the truth, so you'll have to move 'em down a little. And cabinet volumes are different too, so you'll need to modify the dimensions for that as well. You can't just put the midwoofer and port the same distance from one another as they are in the two π tower and expect them to act the same because in this case, it isn't just the relationship between the two sound sources but also internal reflections, the distances to the top, bottom and sides. All this means it isn't apple-and-apples.
You'll just have to measure the speaker when you're done and hope for the best. Maybe build a sacrifical speaker first, and that way if it doesn't work out, you won't be out much. Use either scrap wood or perhaps MDF without a finish. If it measures well, you can add the veneer and finish after it has been proven in testing.
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I agree with you. A sacrificial box is the way to go. I'll build one out of MDF that has removable panels, and a couple of different baffles. So the first trial will be a box of 31 X 15 X 18 placing the drivers height wise near your original design. I prefer to place the vent on the back. If it doesn't measure well, I'll add to my scrap wood pile & try again. 
