I WAS thinking of two KSN1025/1141. The response graph isn't as smooth as I hoped after hearing that it was praised in SpeakerBuilder from Paul C (maybe I just got spoiled by the 1038!?!). I guess that's my first question: should I consider these response graphs accurate?

After looking over the graphs I notice that a single KSN1165 has a slightly smoother response and slightly more sensitivity than TWO of the 1025s! I guess that brings me to my second question: are the 0dB lines in these graphs a common reference or are they normalized to the listed sensitivity in the specifications (ie the KSN1188 is listed as 93 dB and that's the 0db line in the 1188 graph)?

Thanks for the help,
Jeff

PS I'm just listening to some good ol' Quadrophenia ... Keith Moon was a freaking animal!! What a loss!
Him, Bonham, Hendrix ...
What a loss!

The KSN1188 should be using the same 0 dB calibration as the 1165 because both are rated as 93 dB/2.83V. The 1188 looks at least as sensitive as the 1165 so it should be around 99 dB too!

Attacking from another direction, Paul C seems to know his terminals from his tractrix horns. Indeed, Andy G's KSN1005 graph explains why Paul was "less than impressed by the 5khz peak in the little KSN1005... a harsh one note cymbal sound." Paul's trumpeting of the 1188 strikes a cord with me.

So I'm gonna go with the KSN1188 and hope it comes close to the 100-ish dB of the Delta 15. QED. Whew, that felt good!

So now onto the 1188. The graph shows that it doesn't roll-up a la 3rd order like the other piezos. I'm thinking that this must be a measurement glitch since Paul said he successfully ran it with no crossover. The -3dB point looks like ~ 600 Hz (!wow!) so I'm thinking I'll put a 400 to 500 Hz second order on the Delta (does any one have a more precise suggestion?) I bet the Delta will like this low down, double crossing! ;-)

Do I need to worry about throat distortion with this horn trying to go so low?

Thanks for your help guys,
Best regards,
Jeff

Thanks so much for scanning and posting--we finally have some data to chew in the maw of decision!

So here's to Andy,
may he always be randy.

Cheers,
Jeff

Best regards,
Jeff