Thank you for your comments and details. I understand why it creates the wrong impression. I made the image when I just have finished construction. Measured curves are only for Altec. I actually run Utah's and Altec biamped through the software / hardware active digital crossover crossed pretty low - around 80 - 100 Hz. Altecs are run through the class A Nelson Pass's J2s and Utahs are driven with small 2A3 tube amps. I wanted to drive them reversed but they sound much better in the configuration I mentioned due to top end roll off on Altecs. You have a great set up !