Dave A Posted January 29, 2019 Share Posted January 29, 2019 While working on these 456's I notice a piece of plywood inside the cabinet towards the top. It is fill width, starts about 4" back from the front of the motorboard and goes at a 45% angle down towards the back and ends just about at the back top corner of the input cup cutout and has a layer of foam on the down side slope. What exactly does adding this piece do? Quote Link to comment Share on other sites More sharing options...
Mopardamo Posted February 2, 2019 Share Posted February 2, 2019 I'd like to know as well. I'll get mine in a couple weeks. Quote Link to comment Share on other sites More sharing options...
Dave A Posted February 2, 2019 Author Share Posted February 2, 2019 I have been told it breaks up the sound reflections in the cabinet to prevent what they call a standing wave. I did not save the link but do a search for standing wave baffles. Forgot to mention congrats on the 456's. You are really going to like them. Quote Link to comment Share on other sites More sharing options...
windashine Posted February 2, 2019 Share Posted February 2, 2019 Dave, you described the plywood insert well, a photograph would add to the unknowns... it sounds like a semi-folded /semi-brace cabinet article.... Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted February 2, 2019 Share Posted February 2, 2019 On 1/29/2019 at 5:52 PM, Dave A said: While working on these 456's I notice a piece of plywood inside the cabinet towards the top. It is fill width, starts about 4" back from the front of the motorboard and goes at a 45% angle down towards the back and ends just about at the back top corner of the input cup cutout and has a layer of foam on the down side slope. What exactly does adding this piece do? It breaks up standing waves. I'm not that smart so I asked this exact question to Roy last time we were at the factory. He said that they waste a lot of lumber trying and measuring different positions in the speaker until they find just the right spot to put it. Quote Link to comment Share on other sites More sharing options...
Dave A Posted February 2, 2019 Author Share Posted February 2, 2019 1 hour ago, CECAA850 said: It breaks up standing waves. I'm not that smart so I asked this exact question to Roy last time we were at the factory. He said that they waste a lot of lumber trying and measuring different positions in the speaker until they find just the right spot to put it. The references I found for these online all talked about what they do and the value of it but none claimed to have software or the ability to say exactly how to do it for a new speaker. Trial and error and testing each variation to find the sweet spot seems to be the only way. Quote Link to comment Share on other sites More sharing options...
Mopardamo Posted February 2, 2019 Share Posted February 2, 2019 Thank you Dave A. Have lusted for La Scala's since living with them in college. From what folks have said these are another step up! Be interesting to see if my set will have the standing wave breaker. Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted February 3, 2019 Share Posted February 3, 2019 On 2/2/2019 at 10:45 AM, Dave A said: Trial and error and testing each variation to find the sweet spot seems to be the only way. That's pretty much what Roy said. Try a position and measure. Move and repeat till you get the results you want. Quote Link to comment Share on other sites More sharing options...
Dave A Posted February 3, 2019 Author Share Posted February 3, 2019 On 2/2/2019 at 12:04 PM, Mopardamo said: Thank you Dave A. Have lusted for La Scala's since living with them in college. From what folks have said these are another step up! Be interesting to see if my set will have the standing wave breaker. I was surprised to see it since some of the others I have had with that bass bin did not have it. They all sounded great and unless I had the two types side by side I could not tell any difference based on memory. I am sure it improves them but you wont miss the baffle either. It will be fun to read your response to getting these. You should see some of the comments I get back from my buyers. You are in for a revelation. 1 Quote Link to comment Share on other sites More sharing options...
Klipsch Employees Chief bonehead Posted February 5, 2019 Klipsch Employees Share Posted February 5, 2019 On 2/3/2019 at 11:42 AM, CECAA850 said: That's pretty much what Roy said. Try a position and measure. Move and repeat till you get the results you want. Exactly. Good memory. Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted February 5, 2019 Share Posted February 5, 2019 7 hours ago, Chief bonehead said: Exactly. Good memory. Must have been before my first martini 😉 Quote Link to comment Share on other sites More sharing options...
MAGRF7 Posted March 8, 2019 Share Posted March 8, 2019 Just a quick photo of what’s being discussed here. I have 6 sets of these and they all have them. Quote Link to comment Share on other sites More sharing options...
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