by Scott Hinson
When doing active systems, you have to be very careful about gain structures so that you don’t run out headroom, and you minimize noise injection into the system. It’s entirely doable…but inexperienced DIYers can struggle. They’ll end up with the bass channels clipping due to too much low frequency gain, or a hiss in the tweeters (especially with high efficiency horns.)
So….I decided to give it a try again. This time taking what I had learned doing active versions and substantially better parts.
Except when they aren’t. One of these drivers is an obvious choice for an open baffle speaker…the other two aren’t. First the woofer…
The SB Audience Bianco 15OB350 is a 15” woofer with a 2.5” voice coil. The woofer has a thick stamped frame, double half roll surround, and a set of T/S parameters that make it perfect for an open baffle speaker. The driver has a generous xmax of 11mm and a maximum mechanical excursion of 25mm one way. In simulations with a passive low pass filter….using a rather narrow 24” width baffle you can expect an F3 in the low 50Hz range. What’s impressive is the power handling without running into any excursion issues.......read more in pdf file.
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