jwgorman Posted April 7, 2018 Share Posted April 7, 2018 Any of you guys lined the inside of Cornwall IIs? Notice a difference? Always wondered why Klipsch dropped lining when the Cornwall IIs came out. Quote Link to comment Share on other sites More sharing options...
Pete H Posted April 11, 2018 Share Posted April 11, 2018 Don't know the answer, but would like to. I have a pair as well. 1 Quote Link to comment Share on other sites More sharing options...
jwgorman Posted April 11, 2018 Author Share Posted April 11, 2018 I am rebuilding the crossovers this weekend and I’d be in there anyway. Quote Link to comment Share on other sites More sharing options...
JohnA Posted April 13, 2018 Share Posted April 13, 2018 Fill in the cabinet provides some "give" to the air volume in the cabinet. It's part of tuning the cabinet. It makes the cabinet behave as though it is larger than it really is. Don't add stuffing to a cabinet that wasn't designed for it. You will most likely cause a dip in the bass near the low frequency cut-off (-3 dB point). 1 Quote Link to comment Share on other sites More sharing options...
jwgorman Posted April 13, 2018 Author Share Posted April 13, 2018 John, roger that. Older Cornwalls had a lining, paper maybe, that the Cornwall IIs (85-90) didn’t. I’m wondering if a thin lining of the cabinet interior might be beneficial. When I pull the woofers to swap the crossovers I’ll try it. Quote Link to comment Share on other sites More sharing options...
geoff. Posted April 14, 2018 Share Posted April 14, 2018 Are the new Cornwall 3’s lined? Quote Link to comment Share on other sites More sharing options...
Alexander Posted April 14, 2018 Share Posted April 14, 2018 16 hours ago, jwgorman said: John, roger that. Older Cornwalls had a lining, paper maybe, that the Cornwall IIs (85-90) didn’t. I’m wondering if a thin lining of the cabinet interior might be beneficial. When I pull the woofers to swap the crossovers I’ll try it. And if you do not like what you hear you can easily reverse it. Quote Link to comment Share on other sites More sharing options...
GeorgeK Posted April 14, 2018 Share Posted April 14, 2018 My 74 Cornwalls have a 1" thick lining of an insulation . Looks sorta like rock wool? George Quote Link to comment Share on other sites More sharing options...
jwgorman Posted April 15, 2018 Author Share Posted April 15, 2018 I did an experiment with a 1/2” Bonded Dacron Upholstery Grade Polyester Batting. I lined all sides save the motor board. I like what I heard, or didn’t rather when I talked into the cab with the woofer pulled. Quite apparent that there was some reverb happening prior to lining the cab. I think it will stay. Quote Link to comment Share on other sites More sharing options...
edmjm Posted April 15, 2018 Share Posted April 15, 2018 my 79 cornwalls have what looks like tissue paper 1” thick Quote Link to comment Share on other sites More sharing options...
jwgorman Posted April 15, 2018 Author Share Posted April 15, 2018 49 minutes ago, edmjm said: my 79 cornwalls have what looks like tissue paper 1” thick Ah. Yeah I’ve seen pictures of it but I figured the stuff I bought would do roughly the same thing. It is quite noticeable doing a before/after. I can’t imagine why klipsch stopped doing it. Quote Link to comment Share on other sites More sharing options...
edmjm Posted April 16, 2018 Share Posted April 16, 2018 absolutely. why the factory didn’t put something in there to keep the slap echo under control Quote Link to comment Share on other sites More sharing options...
wuzzzer Posted April 19, 2018 Share Posted April 19, 2018 My 1990 Heresy IIs have some gray foam in them that looks to be about an inch and a half thick. I believe I've read that if you do add something like that it's only necessary to add it on three sides. Top or bottom, left or right and front or back. Quote Link to comment Share on other sites More sharing options...
jwgorman Posted April 19, 2018 Author Share Posted April 19, 2018 Interesting. I’ve never seen anything in Heresys. Did you purchase them new? Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted April 19, 2018 Share Posted April 19, 2018 14 minutes ago, jwgorman said: Interesting. I’ve never seen anything in Heresys. Did you purchase them new? The H2s I recapped had this foam inside them. I bought them from the original owner who had never opened them up. Quote Link to comment Share on other sites More sharing options...
jwgorman Posted April 20, 2018 Author Share Posted April 20, 2018 Nice, well I learned something today. That is a cool picture. Klipsch was very efficient with the foam application! Quote Link to comment Share on other sites More sharing options...
wuzzzer Posted April 20, 2018 Share Posted April 20, 2018 On 4/19/2018 at 1:44 PM, CECAA850 said: The H2s I recapped had this foam inside them. I bought them from the original owner who had never opened them up. Mine are exactly like that. Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted April 21, 2018 Share Posted April 21, 2018 4 hours ago, wuzzzer said: Mine are exactly like that. Yeah, a real PITA to recap. Quote Link to comment Share on other sites More sharing options...
Dogsled Posted April 21, 2018 Share Posted April 21, 2018 Would make sense for the Heresy to use stuffing, as it is a sealed box, minimizes echo, as well as acoustically enlarging the cabinet. Quote Link to comment Share on other sites More sharing options...
DavidF Posted April 22, 2018 Share Posted April 22, 2018 On 4/7/2018 at 10:38 AM, jwgorman said: Any of you guys lined the inside of Cornwall IIs? Notice a difference? Always wondered why Klipsch dropped lining when the Cornwall IIs came out. The lining and foam mentioned are used to mitigate standing waves. The variables with standing waves include distance from wall to wall and speaker location within the enclosure. The foam as used in the Heresy catches the waves roughly in the middle of the longest dimension, top to bottom. This where the velocity of the reflections are the greatest. The padding in the earlier Cornwall attacked the waves at the cabinet walls where pressure variations are the greatest. In both situations the need to provide friction to the wave movement or pressure variation. The woofer location in the Cornwall II was changed. It should be considered that this change in location changed the wave pattern internally enough to avoid the need for damping. Quote Link to comment Share on other sites More sharing options...
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