[quote user="Edgar"] Here are the best five performers that I was able to find, out of dozens that I tried. Parameters as indicated in the lower right corner of each plot. In each case the K33E in the stock horn is shown in gray for comparison. The absolute best of the lot is the Altec 515-8GHP, but I wasn't even going to include it because I thought that it was unavailable. But this morning I was browsing the Great Plains Audio site and discovered that they're now making them again

[quote user="John Albright"] What happens if you add corner reflectors to the back of the La Scala bass horn? How does the response curve and impedance curve change? [/quote] Not much. A reflector has to approach 1/2 wavelength in size to make a significant difference.

[quote user="Edgar"]You and I used very different models, and even very different woofer parameters, yet Hornresp comes up with very similar results.[/quote] I opted to use a similar throat model in the LaScala as you used in the Khorn. That is, calculating throat area (S1) at the "splitter" after the horn doubles into two paths. Then entering the slot area as (Atc) area of the throat chamber. I also lengthened the last horn segment and shortened the middle segment slightly maintaining

[quote user="DrWho"] That's interesting that the 150Hz hump shows up in the models too....could always EQ it out and get away with a lower xover frequency. [/quote] Yes, flat response down to 80 Hz looks possible for the LaScala by pulling down the peak. I'm going to give this Ciare 15.64 NdW1 a try. Available at Assistance Audio This is a Neo magnet woofer with lower mechanical damping and a more powerful motor (than the K-33) for quick high impact response.

Here are the Hornresp setup files and the driver parameters that I used.

[quote user="DrWho"]I'm very interested in the horn models that you come up with for the LaScala. I've tried to do it a few times, but I haven't been able to find sufficient dimensions for accurately entering the horn into hornresp.[/quote] Here are the same drivers I identified for the Khorn in the La Scala all on one graph. The Bob Crites driver is the only 4 ohm impedance "direct" replacement in the group.I tried to match the peak responses so they would be relatively

I evaluated dozens of current production 15" drivers and could only find a few that would outperform the stock K33 by any significant amount. Here they are all on one graph. The Bob Crites driver is the only 4 ohm impedance "direct" replacement in the group. I tried to match the responses at 100 Hz so they would be relatively easy to compare. I'm not sure if all these drivers will fit. I'll model the same drivers in the La Scala next.

Greg Could you post the TS parameters for the current model K33E that you used and the source for them? I cant seem to find reliable information. Thanks.

Could someone please post a screen capture of the input window to model these two cabinets in "Hornresp" with the stock K-33 driver. Searching around, I am finding conflicting information. I have the means to measure my cabinets response and may try some other drivers if the "Hornresp" analysis and measurements would make it interesting enough to try.

[quote user="IndyKlipschFan"]Can u take a pic the other direction fron the center out into the room too? [/quote] OK, Here's another pic. That vertical blind on the right acts as a room divider if I need to block daytime light.