The way we're addressing this is to include a 0.5mH coil as a pseudo-first-order filter to create a shelf of reduced energy between 1kHz and 4kHz. The response curve you can expect from a 0.5mH coil in series with an Alpha 10 is shown below.

Pseudo-first-order 0.5mH in series with Alpha 10

Indeed, I am sorry that our periodic changes in performance data at Eminence lend to occassional confusion. This is certainly not ever our intention.

Most manufacturers feel comfortable publishing the same data for years and years without ever considering that changes in components, vendors, and manufacturering techniques have changed the performance of a particular item.

In this case, we just did a complete review of all our published data and power handling capabilities for the reasons I listed above. In addition, we knew that there were some anomolies in our curves caused by our anechoic chamber that needed correction as well as some significant improvements in our voice coil manufacturing techniques that would result in improved power handling. The spec sheets that we put in the products were updated about a month ago, our website with the new data was uploaded yesterday, and our new catalog will be distributed sometime in October.

As you can imagine, the logistics of informing thousands of customers about such changes can be difficult.

I apologize for any inconvenience this may have caused you.

Please contact me directly at chris.rose@eminence.com if you have any further questions or concerns.

Best regards,
Chris Rose
Eminence

I just made some 2Pi's, and am in the process of making some 1Pi's. I love the way the 2Pi's sound, so I'm not going to worry about this. However, I hope that at some point you or others will comment on the inductor and whatever else may be helpful, and let us know if they are worth retrofitting based on actual listening. I don't mind an improvement if it's real world, but you can't listen to a spec sheet.

Matts

The coil should use 20 guage or larger wire, which will result in less than 0.5 ohms DC resistance. A suitable part is the 260-723.This part has 0.5 ohms DC resistance, so the woofer's Qes is only raised by 0.03. The difference in overall system Q is small, so it works pretty well.