hulkss

Here's a copy of my digital XO. 2 octaves sub bass 18 - 75 Hz 2 octaves mid bass 75 - 300 Hz 2 octaves midrange 300 - 1200 Hz 4 octaves treble 1200 - 19,200 Hz

Here's a rear view of one assembled.

Here's a pic of the PSE-144 kit before assembly.

No, there is a difference in the position of the midrange ports and their size and shape. The compression driver is also part of the equation as it interacts with the mids.

So how do they compare the Paul's molded 144's? The midrange drivers on the PSE-144's cover a full two octaves 300-1200 hz which is more than the Danley TD-2's that I have can do. I really like the PSE-144's and they match perfectly to a K-Horn. I would need to set up the TD-2's in the same room for a comparison. The PSE-144 horns have much better pattern control at 300 HZ since they are quite a bit larger. The point source design really beats separately placed horns like the factory K-Horn. I did run my K-horns quite awhile tri-amped and that was pretty darn good compared to passive. The K-horns sound better with a 300 Hz XO, no more vocals coming from the bass horn.

Who are you?

That's a 10 foot wide drop down screen and those are windows where you see reflections. The windows have three layer soundproof glass in them. The other "windows" are plugged with 2 layers of MDF with green glue damping adhesive between. The seats are: http://www.hjellegjerde.com/comfortcollection/?menu=367&product=262 To me, the best part of the set up can be achieved with the stock factory horns. I removed all the X-overs and multi-amped everything with Audiolense from: http://www.juicehifi.com/index.html The horns are a Danley Synergy type design sold as a DIY kit from Australia. I have a set of Danley horns in this room:

I put a set of PSE-144 horns on top in my home theater. Very nice indeed http://www.redspade.com.au/audio/PSE-144.php http://redspade-audio.blogspot.com/2014/08/pse-144-active-dsp-crossover-how-does.html?utm_source=BP_recent

The Altec is a 16 inch driver and is too big and does not fit. The BD-15 is only available from one source in the Netherlands and is very expensive. I am now listening to the Ciare 15.64NdW1. It mounts identically to the K33E and bolts right in to a La Scala II cabinet. I did have to open up the access hole a tiny bit to get it in. You can see in the photo where I filed on the opening. It is availabe here for $158. Ciare at Assistance Audio.

Not much. A reflector has to approach 1/2 wavelength in size to make a significant difference.

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 the overall length. This was to prevent the "Cir > 1" warning. The help file in "Hornresp" states that results are invalid if this message appears. I have modeled a lot of horns in "Hornresp". It takes fairly big percent changes in a model to make a significant difference in the SPL output. After all, a 6b change requires the acoustic pressure to double.

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.

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 easy to compare. I'm not sure if all these drivers will fit. The response is modeled with the speaker in "quarter space" (on the floor backed up to a wall). The drop in response below 100 Hz is consistent with my Audyssey setup results which recommended a 100 Hz crossover from the La Scala to the subwoofer.

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.