roy allison's findings

[Simon Hickie]

As Doc has mentioned elsewhere, you get increasing fall-off with increasing frequencies at greater angles from the speaker axis. This 6.5inch driver from Visaton http://www.visaton.com/en/chassis_zubeh ... 70s_8.html is about 5db down at 90 degrees off axis at 2000hz but only just over 1db down at 1000hz. And it's in this range that the tweeter is beginning to add to the output with the first order slope from the tweeter capacitor giving nice integration around the -6db point. Doping plus even more fall-off at higher frequencies helps with the resonance issues

So all in all, when taking room acoustics into account, it's a compelling set of virtues stemming from an upward facing doped bass/mid driver running full range and with a simple cap and resistor on the tweeter. For the inexperienced (in my case, read generally incompetent) DIYer like me a DIY cube offers a really easy build too. What's not to like?