Quote Originally Posted by toddalin View Post
You are running the Utahs too high.

The Mastering Labs put a big choke on it for a 1st order slope. The crossover even cost more because of the choke.



My Super Big Reds are triamped with passive eq units between the horns and their amp. This is in all probability a "one-off" created by The Mastering Labs.




These are the slopes:

HF (no passive eq added):


604 woofer:


Utah woofer (no bass boost engaged):


https://youtu.be/iGa9259pz-I

https://youtu.be/4MWmYYV1bg4
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 !