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As Dennis noted the key is having the right cabinet volume and passive radiator combination. I've already found one that works great and am looking at another combination as well. I've used the other drivers that Dennis has mentioned and the Purifi has some advantages but of course at a higher cost. The response curves are good for the SB Acoustics woofer but it doesn't have the dynamics and power handling capability of the Purifi. The Scan-Speak has a rougher upper midrange and benefits from a 3-way with a lower crossover point, plus it has suspension limiting and higher distortion.Hi Rick, Dennis just commented on the issues he had with implementing the PTT6.5 on AVSForums:
Not sure how far along development you are, but have you encountered anything similar? Or have you found a box size/alignment that allows the Purifi to realise its potential?
With the BMR design the Purifi didn't make sense since the cabinet volume wasn't right. It's not designed for operation with a port and that's one reason why they created a companion passive radiator. A port will have too much noise due to the high excursion capability of the Purifi woofer.
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