Klipschguy Posted March 19 Share Posted March 19 Greetings, I am restoring a pair of Heresy I speakers that will require a new pair of woofers. The replacement will be the Klipsch K28e, which is also found in the Heresy III & IV (the III is sealed, while the IV is ported). The restoration project will keep the original, sealed configuration. By my calculation, without any damping material (like the Heresy I originally was designed), the K28e with give a Q of about .9 which leaves the system a little under damped (if .7 is the goal). My question is how much damping does the Heresy III have? I would be interested to know the material, the size, the thickness, and how it is placed in the cabinet. I figure Klipsch has correctly figured out the correct damping for the K28e in a Heresy cabinet, so the information should be helpful for a proper restoration. Also, I am quite willing to buy the part (foam damping) from Klipsch if they sell it. Thank you, kindly, Andy Quote Link to comment Share on other sites More sharing options...
Bubo Posted March 19 Share Posted March 19 I don't know anything about speaker design but I would try one inch of the synthetic fill fabric from any fabric store laid in the bottom of the unit with a few extra inches up the sides. Should reduce reflection and standing waves, resonance may still be an issue if the speakers are screaming, mine seldom are above 1 watt See if you can hear the difference with mono, one speaker with fabric use the balance control back and forth My2 cents ........ Replacing my H1 crossovers made a noticeable difference could have been 40 year old oil caps or the dry rotted gaskets on the squaker 1 Quote Link to comment Share on other sites More sharing options...
Full Range Posted March 19 Share Posted March 19 I have built many speakers and based on my previous builds that works well if required is The only part of the cabinet that needs insulation is the sides back and top - nothing on the front and bottom of the cabinet 1 1 Quote Link to comment Share on other sites More sharing options...
Bubo Posted March 19 Share Posted March 19 5 minutes ago, Full Range said: I have built many speakers and based on my previous builds that works well if required is The only part of the cabinet that needs insulation is the sides back and top - nothing on the front and bottom of the cabinet Good question not sure the tweeter or mid horn generates much energy inside the enclosure wouldn't the woofer in a 360 pattern not sure how hard it punches towards the rear seems like a good measurement exercise perhaps a hocky puck at just the right spot ........ 1 Quote Link to comment Share on other sites More sharing options...
OO1 Posted March 19 Share Posted March 19 I use the Heresy 1 with the k-28 or K-22 ..... 0 damping , 0 modifications , however if I would have added any damping , I would have used a standard foam piece U shaped .. 1 inch thick , placed loose around the woofer just like klipsch do in multiple other speakers . 1 1 1 Quote Link to comment Share on other sites More sharing options...
Klipschguy Posted March 19 Author Share Posted March 19 001, when you say around the woofer do you mean a U going below the woofer in the bottom of the cabinet, or an upside down U between the squawker and the woofer? BTW, Altec used to place insulation on the top and 1 side but we are talking Klipsch… 1 Quote Link to comment Share on other sites More sharing options...
winglet Posted March 19 Share Posted March 19 Fwiw, my stock kp250 (pro heresy ii) have and upside down “u” of foam around the woofer 1 1 Quote Link to comment Share on other sites More sharing options...
OO1 Posted March 19 Share Posted March 19 @KlipschguyYes , upside down U . 1 1 Quote Link to comment Share on other sites More sharing options...
Bubo Posted March 19 Share Posted March 19 6 hours ago, winglet said: Fwiw, my stock kp250 (pro heresy ii) have and upside down “u” of foam around the woofer Pic no rush M Quote Link to comment Share on other sites More sharing options...
winglet Posted March 19 Share Posted March 19 1 hour ago, Bubo said: Pic no rush M They aren’t at the house. It’ll be a few months.. lol Foam goes from the bottom, up over the woofer and down the other side. It’s deeper than the cabinet and folds over the woofer magnet from the top and sides as well. This thread talks about heresy foam: 1 Quote Link to comment Share on other sites More sharing options...
Klipschguy Posted March 19 Author Share Posted March 19 Winglet, Thank you for the thread; it was informative, however I did not see anything regarding the Heresy III’s damping configuration (a bit of a mystery). Respectfully, Andy Quote Link to comment Share on other sites More sharing options...
winglet Posted March 19 Share Posted March 19 1 hour ago, Klipschguy said: Winglet, Thank you for the thread; it was informative, however I did not see anything regarding the Heresy III’s damping configuration (a bit of a mystery). Respectfully, Andy III have foam as well.. Probably identical to the II, as the II to III upgrade kit does not include it 1 Quote Link to comment Share on other sites More sharing options...
Klipschguy Posted March 19 Author Share Posted March 19 Good point on the upgrade kit with the foam being reused from the H2. Your replies and help are much appreciated. Andy Quote Link to comment Share on other sites More sharing options...
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