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Speaking of transient response and group delay, I'm interested to see the opinions fly when we talk about our first speaker with a passive radiator. Here's a Mackie rep's response about the HR824:
"...Yes the output of the passive radiator is slightly delayed from the front fired wave. It does require some time to get the mass of the radiator moving. But it also requires some time (granted not as much) to get the air moving through a port. And a port that was long enough to do what the passive radiator does would create other issues if it was even possible..."
Yes, this is an accurate statement IMO. The "issues" caused by long ports I explained in a bit of detail here. They are particularly a problem in 2-way designs. For woofers in 3-way designs and (especially) subwoofers, ports can get very long before they start causing the same kinds of problems, since the pipe resonances and standing waves within the cabinet will remain out of band until the dimensions become quite large.
The HR824 is a two-way design of course, and therefore more susceptible to the problems described.
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