Not sure which direction I am going to go either full up passive or an active with passive compensation on the Heil to help flatten the response. Have to be very careful with the impedance of the Heil driver combining with a passive network. Took a couple of measurements to get started of the raw driver, got an odd notch in response, repeated the measurement and it didn't go away. Have to try off axis but varying distance had no effect nor did temporarily using a baffle to keep the back-wave out of the measurement.. I did a quick 18Db network with a 5 K notch it's not bad at all. With the losses in the network it's close to the 91/92 sensitivity of either a 128H-1 or a 2214H.
Rob
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