HarleyHacker Posted October 17, 2004 Share Posted October 17, 2004 I just finished building a custom Center Channel Speaker to go with my La Scala Fronts in my HT. The Speaker consists of 3 parts. The Center Section contains a k-77-m and a k-55-m with K-401 Horn and is dimensioned after the HF section of a La Scala. On both sides of the center cabinet are K-24-Ks (Heresy II Woofers)in seperate Cabinets dimensioned similar to a Heresey II Cabinet. I have ALK networks in the La Scalas and and ALK for the Heresy in the Center Speaker. Should I be using a crossover for a La Scala instead of the one for a Heresy. Thanks, Tim Quote Link to comment Share on other sites More sharing options...
Frzninvt Posted October 18, 2004 Share Posted October 18, 2004 You want the correct capacitor and coil values for the K-55M, and that would come from a La Scala type crossover, but you also want the correct values for the K-24-K which is a Heresy II woofer. You will need to build a custom crossover to properly run the drivers that you have chosen for your custom center. I am sure that you can use a Heresy or La Scala crossover as your starting point and modify it accordingly. The La Scala crossover can run the mids and highs and then just determine the cap/coil values used in the Heresy II to dial the woofers in. You could have just used another La Scala laying on it side? That center sounds like it is one big mother anyway. Quote Link to comment Share on other sites More sharing options...
HarleyHacker Posted October 18, 2004 Author Share Posted October 18, 2004 Frzninvt Quote Link to comment Share on other sites More sharing options...
HarleyHacker Posted October 18, 2004 Author Share Posted October 18, 2004 Frzninvt, Thanks for the response. How can I get the Cap and inductor values for the K-24-K. Especially since I have 2 of them hooked up parallel. I know by reducing the resistance that lowers the crossover point but only for the woofer I don't know if it changes the Crossover freq for the squawker. BTW the size is not that big. The Woofer Cabs are 15 1/2 x 15 1/2 x 17"Deep. I made them deeper rather than tall or wide. Tim Quote Link to comment Share on other sites More sharing options...
Frzninvt Posted October 18, 2004 Share Posted October 18, 2004 A copy of the Heresy II crossover schematic would be a good start. Then you can adjust the values to compensate for the dual woofers. Let me see if I have a copy of the HII schematic. Quote Link to comment Share on other sites More sharing options...
Frzninvt Posted October 18, 2004 Share Posted October 18, 2004 The attaching photo's thing is still not working on the forum, I can email it to you if you like though! Quote Link to comment Share on other sites More sharing options...
HarleyHacker Posted October 18, 2004 Author Share Posted October 18, 2004 Frzninvt, That would be great. My email is tyoung@cmsinter.net. Thanks, Tim Quote Link to comment Share on other sites More sharing options...
JohnA Posted October 18, 2004 Share Posted October 18, 2004 Since you are using 2 HII woofers, the whole thing has to be changed. I *think* the K-24 is also 94 dB/w/m, so 2 would net 97 dB and 1/2 the impedance. The L-77 runs at 105 dB and the K-55-M runs at 107 dB. The network must balance all 3 outputs, basically pull everything down to 97 dB/w/m. If the K-24 is actually 96 dB, add 3 more for 2. Quote Link to comment Share on other sites More sharing options...
HarleyHacker Posted October 18, 2004 Author Share Posted October 18, 2004 John I think I am on the right track. I am using ALKs network for the Heresy. I have the tweeter on tap 4 and the squawker on tap 3. What are your thoughts. Quote Link to comment Share on other sites More sharing options...
SCOOTERDOG Posted October 18, 2004 Share Posted October 18, 2004 I love seeing custom centers built. I am currently running a modified crossover based on the Drivers used: 2 Klipsch KV1089 Copper Metallic Woofers. Electrovoice T35 (aka Klipsch K77) Horn Tweeter w/Alnico Magnets Klipsch K52 Midrange driver w/ a 90x60 TriTrix Horn Crossover is 3 way 2nd order(12db) w/ a 3 octave spread between crossover points.Metallized polypropylene are used in critical midrange and tweeter paths. 18 guage inductors are used to keep DC resistance to a minimum. Crossover points are 700/5600. 2 4" flared ports in the rear. Cabinet size is 42"w x 13.5"h x 15"d You can go to the construction site to check it out http://www.geocities.com/scooterb4u/Custom_Center.html Quote Link to comment Share on other sites More sharing options...
JohnA Posted October 19, 2004 Share Posted October 19, 2004 I'd say you are probably one tap too high. Each lower numbered tap is -3 dB and 2x the impedance. Quote Link to comment Share on other sites More sharing options...
3dzapper Posted October 19, 2004 Share Posted October 19, 2004 I'm running an external H2 network attached to the back of my RPT with a K-55/K700 and K-77 using the bass section of an RC-3II with good results. Rick Quote Link to comment Share on other sites More sharing options...
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