KanedaK

In my configuration, the acoustic foam helps a lot, but it's quite different from you guys as the "reflecting part" is the "upper lip" of the EV SM120 midrange horn I use, and the Beyma tweeters sits just above it. The shape of the EV horn is not deep at all compared to a K400, while the beyma tweeter is quite deep compared to a K77... the result is when they're mounted on the same motorboard, the tweeter and midrange drivers are much more aligned than with stock K400/K77 combination. At the same time, the tweeter is about 10inches backwards compared to the stock config. It's very possible that the reflection is not noticeable in your setup because there's more distance between the tweeter and the possible "reflection" point. I just posted a picture in another thread: http://community.klipsch.com/forums/t/144806.aspx?PageIndex=2 anyways I got in this set-up a bit by accident, but mid and treble seem to integrate seamlessly and imaging is much more natural than before. If I remove the foam I can hear some slight treble tilt but also the sounds seem to hang on more "on the speaker" and imaging suffers a bit. it's not a night-and-day difference but enough to bother me.

Good idea to put the tweeters backwards. Now if you'd put some acoustic foam on top of your LS (whatever looks OK and clean and absorbs high frequencies would probably be OK) would make ur speakers "disappear" even more effectively by cancelling the sound that bouces from your wide dispersion tweeters on the top panel (first reflections, diffractions, u think you don't hear those ...until you get rid of them. IMHO.). Of course the WAF factor might suffer accordingly... just my two cents...

I always loved my LaScalas, but the very very best upgrade I ever did to my system is to get rid of the K400 and use some EV SM120A horns. I too could never go back to the K400. Better tweeters help too: I use Beyma CP25. Big improvement. Sound is more evenly sprayed in the listening room, more spacious, more detailed, and smoother. Of course my LaScala were ugly as hell when I bought them so building another top bin to hold the new mid and tweeter was not an issue. i'm awaiting for new crossovers; when they'll sound really at their best, I'll take care of the cosmetic issue ;-)

I like those with the round horn. So they're the Pioneer? probably from the TAD division?

Those Jubilees look FANTASTIC. How do they sound? what are the specifications? wich drivers? x-over frequency? they look so impressive!!!

Wow. Thanks everybody, it's nice to see you guys are as passionate about this as ever! I guess I'll stay with my AAs for now, just recapping them, maybe adding that bypass cap. What surprises me is that the Beyma would measure less output than a K77? I've had two different sets of K77, one with the alnico magnets, one with the square magnets, and both sounded less strong than when I installed the Beymas...

I'm starting a new list of tweeters to try, and the APT150 and APT200 are now on the list. I'm a little confused about the model numbers, but I'll straighten it out when it comes time to purchase them. I'm still hoping to find a tweeter I like as much as the Beyma CP25 that is not a baby cheeks horn. Looking for something flush mount. I'll keep trying. Greg I'm using the Beyma in my Lascalas, it's a great tweeter indeed. Why don't you just build a nice wooden panel for it, that would sit on top of your Klipschorns? could look OK, and you don't have to modify anything to your babies.

Hello everybody, I'm planning to update the networks in my LaScala because I feel they don't sound as clear as they should. What I have now is the original AA networks and they look pretty bad, altough I don't have the required equipment to actually measure them. I'm also experiencing some channel unbalance, some sounds being stronger on the right speaker than the left one, it's quite subtle but it kinda screws he stereo image, I feel like bad caps in the left speaker might be the cause (?). I'm using a high power solid state pre-power combo ( DIY Kaneda preamp, vintage Technics SE-A5 power amp, all DC troughout ) wich I'm only using the first watts as confirmed by the power meters on the amp ( I never even reach 1Watt average, except for parties), my living room being quite small 6mx4,5m, and my neighbours quite..huh... touchy. (I'm aware many will read this and think "horn speakers in a medium small space using the first watt of a high power SS amp, that would be the worst mismatch ever made" but I can assure you it sounds quite great, thank you ;o) ) The LS are upgraded with new medium horn lenses (120degrees pattern Electro-Voice SM120A, stock K55V drivers) and new tweeters (Beyma CP25), both were great improvements over the original sound. I had to tame down the tweeters a bit with an L-Pad since they're a bit too hot in my set-up, no matter wich amp i'm using (I've tried many amps during the last 5 years). So far I must say I'm not hearing any negative effect from the L-pads; this might change when the networks are recapped, but I think maybe this is more sensible with low power tube amps having an already low damping factor. That is not the case of the amp I'm using. I've considered an upmatket network such as the ALK uiversal, but my budget dictates a much cheaper approach for now, so I'm hesitating between recapping my AAs or, even cheaper, converting them to type A networks. Also I'm not using much power and don't feel so concerned about tweeter power handling. theorically I'm attracted to the 6dB/oct attenuation of the type A, but since both my midrange AND tweeter dispersion pattern are much, much wider than the stock ones, I'm really concerned about driver overlap. I don't wanna end up with bumps and dips in the frequency range between, say, 4,5KHz and 8KHz. IMHO I feel this would be hard to avoid with a first order network (but then, why does it sound better to some people?). Also, what about changing the x-over frequency from 6Khz to 4,5KHz as advertised by Bob Crites? Would this cause more/less driver overlap? any thought / experience would be greatly appreciated. thanks folks!