Wayne , yesterday I sat down and started figuring out the flats cut I need to make and began wondering if 3/4" material is going to be enough. I went ahead and wrote out the flats cuts for 1" MDF and 1.5" MDF or Baltic Birch as well. Since am spending $1100 on the parts I don't want to go the cheap route with these cabinets. This is the most I have ever spent on a speaker and they need to keep me happy for a very long time. What should I do?
Also I figured the Vb to be 3.65cuft before subtracting the drivers and port, so the total must be around 3.4cuft add stuffing and it should bring it to around 3.5cuft with a 6"x3.5"x10" the tuning is right around 34Hz....am I going to have a problem with the driver unloading?
With my subwoofer experience I know that a when a drivers mechanical limits are reached things can get ugly, the 2226H only has 7mm of travel each way while my subwoofer drivers have 16mm of travel each way and with enough power I have no trouble bottoming them out. Is their some sort of driver protection build into the four Pis crossover?
Wayne Parham Messages: 18791 Registered: January 2001
Illuminati (33rd Degree)
There's nothing wrong with making the panels thicker except it makes the cabinet heavier. It's really more important that they be well braced. As long as you brace them well, you don't need the extra thickness but it won't hurt anything either.
As for woofer loading and cabinet size, the four Pi provides good cone control with smooth rolloff down to about 30Hz. It won't really be completely unloaded until fl, which is under 20Hz. The response curve is slightly overdamped, so rolloff is smooth and gradual, and there's useful output down to about 30Hz.
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