OO1 Posted October 17, 2021 Share Posted October 17, 2021 1 hour ago, Marvel said: That's not what Dennis is saying... 31Hz, WOW , Gotta see this on Instruments , can someone with a ported Lascala bass extension give us a few readings Quote Link to comment Share on other sites More sharing options...
ClaudeJ1 Posted October 17, 2021 Share Posted October 17, 2021 1 hour ago, Marvel said: That's not what Dennis is saying... 31Hz, it's substantially louder (ported and eq), even without the eq it's much better. Not when you look at Karlson 3's actual curves. Quote Link to comment Share on other sites More sharing options...
ClaudeJ1 Posted October 17, 2021 Share Posted October 17, 2021 1 hour ago, Marvel said: That's not what Dennis is saying... 31Hz, it's substantially louder (ported and eq), even without the eq it's much better. I have to ask. Since you have been such a proponent of this going back to 2008, did you ever actually BUILD one and measure it? Quote Link to comment Share on other sites More sharing options...
OO1 Posted October 17, 2021 Share Posted October 17, 2021 3 minutes ago, ClaudeJ1 said: Not when you look at Karlson 3's actual curves. link ? please , tx Claude Quote Link to comment Share on other sites More sharing options...
ClaudeJ1 Posted October 17, 2021 Share Posted October 17, 2021 2 minutes ago, 001 said: link ? please , tx Claude Quote Link to comment Share on other sites More sharing options...
Curious_George Posted October 17, 2021 Share Posted October 17, 2021 I have measured it. Let me find the file or remeasure with REW again. If I remember correctly, with the EQ and room gain, it will extend the low end down to 35Hz. 1 Quote Link to comment Share on other sites More sharing options...
Marvel Posted October 18, 2021 Author Share Posted October 18, 2021 On 10/17/2021 at 4:51 PM, ClaudeJ1 said: I have to ask. Since you have been such a proponent of this going back to 2008, did you ever actually BUILD one and measure it? Mostly, because I tried to copy all of Dennis' posts, but they have been is some disarray. It seems more important to me now that he is gone. After I got a pair of La Scalas, I always wanted to do it, but I had zero shop space and almost no tools. After the wife and I moved, nothing really changed, but I sold the LS in 2014. Then, I found a pair sitting on a guys front porch. Paid $100, got them home and found I really only got cabinets (and one of those was a clone). ALL the parts were non Klipsch, and nowhere close to specs that would really work. Over time I got some mint K-33s from JWC (who had sold them to my older son).I still had the DHA2 crossovers from my old LS I had sold, as they had crossovers they wanted to use. I bought a pair of K-400 horns from someone, and used the EV 1828 drivers the were in the cabinets (Klipsch used those for a while and they sound fine). And I still had the Eminence APT-50 from Bob on the Eminence 100x50 horn. I was good to go, and they sounded great. Still do. However, I finally bought a small router and opened up the top of the doghouse. They I promptly put a cover on it so I could still listen. I got slowed down as I front mounted the K-400s, and they sit slightly away from the baffle, so I need to either caulk them , or modify them so they would fight flush and could be sealed easier. Long story is there are still plans to finish the mod. I would still need to close in the back and put the ports in and a few other things. Added to that was getting the MWMs, so you know which was easiest to do -- crank up the MWMs. I just replaced the LS woofers with the MWM connections and it sounds really good. Quote Link to comment Share on other sites More sharing options...
ClaudeJ1 Posted October 18, 2021 Share Posted October 18, 2021 3 hours ago, Marvel said: so you know which was easiest to do -- crank up the MWMs. I just replaced the LS woofers with the MWM connections and it sounds really good. Great story. Thank you for sharing. Quote Link to comment Share on other sites More sharing options...
Curious_George Posted October 21, 2021 Share Posted October 21, 2021 Here is a quick & dirty REW curve. I can't find the other measurement from many moons ago. I say quick & dirty because my basement has yet to be straightened out and set-up after moving. To clarify - Blue line is with port mod, purple line is with port mod & EQ. Quote Link to comment Share on other sites More sharing options...
ClaudeJ1 Posted October 22, 2021 Share Posted October 22, 2021 Your super tweeter section is a bit hot. But I'm sure you noticed on sibilance and cymbals. Quote Link to comment Share on other sites More sharing options...
Curious_George Posted October 22, 2021 Share Posted October 22, 2021 8 hours ago, ClaudeJ1 said: Your super tweeter section is a bit hot. But I'm sure you noticed on sibilance and cymbals. Yes, still experimenting with different tweeters & crossovers. Quote Link to comment Share on other sites More sharing options...
Curious_George Posted October 22, 2021 Share Posted October 22, 2021 Another forum member PM'd me and asked if I would help them build the high pass filter circuit for the LaScala mod. I put together a BOM from Jameco so the parts could be sourced easily from one location. Of course there are many places to get the parts from, but Jameco has good prices and has everything in stock. I have no affiliation with Jameco. 18dB High Pass Filter EQ_LaScala Part BOM_102121.pdf 3 Quote Link to comment Share on other sites More sharing options...
Marvel Posted October 23, 2021 Author Share Posted October 23, 2021 Do you have the schematic for that circuit? Quote Link to comment Share on other sites More sharing options...
Curious_George Posted October 23, 2021 Share Posted October 23, 2021 1 1 Quote Link to comment Share on other sites More sharing options...
Curious_George Posted October 23, 2021 Share Posted October 23, 2021 Power supply can be a simple bi-polar unregulated type to fully regulated. +/-9VDC to +/-15VDC is acceptable. I’ll leave the power supply type up to the end user. Quote Link to comment Share on other sites More sharing options...
billybob Posted October 23, 2021 Share Posted October 23, 2021 And 40 hz is about right. True their may be some extension but, for solid down, another modder kept coming back to the similar number down. If so, pretty decent, would like to think. The modder that was on another forum did the LS through the top from bin and, numbers from the modeling software came in with similar results. Dennis and he conferred by phone and had a decent conversation according to the link. Thanks! Quote Link to comment Share on other sites More sharing options...
Marvel Posted October 23, 2021 Author Share Posted October 23, 2021 9 hours ago, Curious_George said: Thanks, wasn't paying attention. I think I have a bunch of the 5532s here somewhere. Quote Link to comment Share on other sites More sharing options...
codewritinfool Posted October 23, 2021 Share Posted October 23, 2021 Yeah, I talked with Claude and he suggested that I build a Bill Fitzmaurice THTLP and call it good, which I may do just for fun anyways. This is the right answer, IMO. 1 Quote Link to comment Share on other sites More sharing options...
Marvel Posted October 23, 2021 Author Share Posted October 23, 2021 1 hour ago, codewritinfool said: This is the right answer, IMO. I want to hear what the results are from the ported boxes. He already has those done, other than staining/finishing. 1 Quote Link to comment Share on other sites More sharing options...
Curious_George Posted October 23, 2021 Share Posted October 23, 2021 2 hours ago, Marvel said: Thanks, wasn't paying attention. I think I have a bunch of the 5532s here somewhere. Just about any flavor of 2 channel audio op-amp will work. The circuit is very forgiving and layout is non-critical for the most part. I prefer bi-polar input types to FET, for audio. Quote Link to comment Share on other sites More sharing options...
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