Wayne Parham Messages: 18787 Registered: January 2001
Illuminati (33rd Degree)
The way direct radiators work, there is some increase on-axis at higher frequencies as a result of collapsing directivity. Most tend to also have some mass-rolloff that counters this to some degree, but in general, there is slightly rising on-axis response and slightly drooping power response as frequency rises. That's what you see in the midrange - but it's pretty much a wash in the total radiated energy.