mopardave Posted December 20, 2017 Share Posted December 20, 2017 I have a pair of old Heresy's that I had robbed for parts back when I built my built my Cornwalls. I think it was DeanG that gave me directions on building the xo for these Cornwalls using Sonicaps. What id like to know is are the B xo compatible with the Heresy? I would like to use these B's in the Heresy and buy new xo for the cornwall, maybe Crites or even Alks. Thanks Quote Link to comment Share on other sites More sharing options...
jimjimbo Posted December 20, 2017 Share Posted December 20, 2017 Yes you can.....Recommend turning them into the famous ClaudeJ1's "Super Heresy". Here's the link and directions. I have a pair and love them. Building more this winter. Quote Link to comment Share on other sites More sharing options...
mopardave Posted December 20, 2017 Author Share Posted December 20, 2017 ok, that sounds interesting. have to check the price on the woofers first. My Heresy is the 1982 versions I believe. (138x212) Not sure what mid is in these but I'm pretty sure there not k55. Will my updated B xo need any mods with these mids? will be using k77 tweets. Sounds like a nice winter project. Will be driving these with tubes. Quote Link to comment Share on other sites More sharing options...
jimjimbo Posted December 20, 2017 Share Posted December 20, 2017 You might be lucky and have the K55 solder lug mids in there.....If you go with the Super Heresy project, you can use the B networks straight up. Quote Link to comment Share on other sites More sharing options...
mopardave Posted December 20, 2017 Author Share Posted December 20, 2017 just pulled the back off. they do have k55's in them. so, just need to install the ports with Delta Pro woofers and the B xo from my home brew Cornwalls. Should be straight forward. Found the Woofers for $109ea. What would you suggest for new xo in the cornwalls? Crites or Alks? Quote Link to comment Share on other sites More sharing options...
jimjimbo Posted December 21, 2017 Share Posted December 21, 2017 Crites where did you find the woofers at 109? Quote Link to comment Share on other sites More sharing options...
mopardave Posted December 21, 2017 Author Share Posted December 21, 2017 Ebay with free shipping. Curious to why you suggest Crites over Alks? Have you heard both? Quote Link to comment Share on other sites More sharing options...
mopardave Posted December 21, 2017 Author Share Posted December 21, 2017 Here is a current pic of the up dated B in my Cornwalls. Quote Link to comment Share on other sites More sharing options...
mopardave Posted December 21, 2017 Author Share Posted December 21, 2017 Pic of the Heresy k55 mid driver. Quote Link to comment Share on other sites More sharing options...
jjptkd Posted December 21, 2017 Share Posted December 21, 2017 You want to make sure that you buy the right woofers, I just checked eBay and the cheapest I found the Eminence Delta Pro 12a was $129.99 shipped. https://www.ebay.com/itm/Eminence-Delta-Pro-12A-Professional-Series-12-400/263354644081?hash=item3d5128f671:g:4esAAOSwOA1aIFEL Quote Link to comment Share on other sites More sharing options...
mopardave Posted December 21, 2017 Author Share Posted December 21, 2017 yur right. I was looking at the 450 for $109. gonna wait til January. maybe find a lower price then. thanks Quote Link to comment Share on other sites More sharing options...
jimjimbo Posted December 21, 2017 Share Posted December 21, 2017 Ebay with free shipping. Curious to why you suggest Crites over Alks? Have you heard both?I will send you a PM. Quote Link to comment Share on other sites More sharing options...
mopardave Posted December 21, 2017 Author Share Posted December 21, 2017 Just scored 2 Delta Pro 12A woofers for $210 from proaudio ebay. Just need ports 1 Quote Link to comment Share on other sites More sharing options...
jjptkd Posted December 22, 2017 Share Posted December 22, 2017 On 12/20/2017 at 2:54 PM, jimjimbo said: If you go with the Super Heresy project, you can use the B networks straight up. Just curious the Cornwall uses a 4 ohm woofer and the Heresy an 8 ohm woofer and the Eminence Delta Pro 12a is an 8 ohm driver, wouldn't the type "B" crossover be set up for a 4 ohm woofer and different from a modified type "E"? I just assumed that there would be a difference in power to woofer and possibly crossover point when using 4 ohm vs 8ohm? I'm really not sure and asking? Thanks. Quote Link to comment Share on other sites More sharing options...
mopardave Posted December 22, 2017 Author Share Posted December 22, 2017 I'm curious to this as well. Quote Link to comment Share on other sites More sharing options...
jimjimbo Posted December 22, 2017 Share Posted December 22, 2017 40 minutes ago, jjptkd said: Just curious the Cornwall uses a 4 ohm woofer and the Heresy an 8 ohm woofer and the Eminence Delta Pro 12a is an 8 ohm driver, wouldn't the type "B" crossover be set up for a 4 ohm woofer and different from a modified type "E"? I just assumed that there would be a difference in power to woofer and possibly crossover point when using 4 ohm vs 8ohm? I'm really not sure and asking? Thanks. Claude did the measurements, let's ask the expert! @ClaudeJ1 Quote Link to comment Share on other sites More sharing options...
jjptkd Posted December 22, 2017 Share Posted December 22, 2017 Looking at the crossover schematics for the type B and type E crossovers they both use the same 2.5mh inductor on the woofer. This is interesting because of the different ohm rating of the woofers but since the woofers should be crossed over differently due to speaker design, Cornwall at roughly 600hz and Heresy at roughly 700hz I wonder if the math works itself out somehow? I guess output level matching for the drivers is done through horn output manipulation as the woofers are the weakest link either way in sensitivity so they are just ran wide open and horn output adjusted to match. I'm trying to find info or a calculator online now to help determine inductor size for crossover points and if the ohm rating of the woofer even matters, I've just always assumed that it does? Quote Link to comment Share on other sites More sharing options...
ClaudeJ1 Posted December 22, 2017 Share Posted December 22, 2017 On 12/21/2017 at 7:38 AM, mopardave said: yur right. I was looking at the 450 for $109. gonna wait til January. maybe find a lower price then. thanks Probably not. It's a premium product, but it can't hurt to wait a few more weeks. Quote Link to comment Share on other sites More sharing options...
ClaudeJ1 Posted December 22, 2017 Share Posted December 22, 2017 5 hours ago, jjptkd said: Just curious the Cornwall uses a 4 ohm woofer and the Heresy an 8 ohm woofer and the Eminence Delta Pro 12a is an 8 ohm driver, wouldn't the type "B" crossover be set up for a 4 ohm woofer and different from a modified type "E"? I just assumed that there would be a difference in power to woofer and possibly crossover point when using 4 ohm vs 8ohm? I'm really not sure and asking? Thanks. The actual impedance for a K22 Heresy woofer is closer to 11 ohms. The Delta Pro 12a is 8 ohms, and the K33 varies a bit between 4-5.6 ohms, depending on what Heritage speaker it's in (Cornwall, Belle, LaScala, or Khorn). The same choke works for all of them because, as a first order low pass filter, the "exact" value is less critical than the other "legs" of the network rendered by the driver inductance, impedance, and mechanicals of the boxes they are bolted in, stuffings, etc.. In all cases that SINGULAR impedance number we seem to (overly at times) worry about varies tremendously with frequency. Basically, a user should just try a B network and see how it sounds, then adjust from there. Room acoustics and placement will have WAY more significance in the ACOUSTIC OUTPUT than any "wiggling" of the generic component values. Plus, the owner/listener owns the salt shaker, the soup, and, most importantly, the TASTE BUDS! (Hey, it's Christmas, so food analogies are appropriate on a tech. thread, OK?! So, just TRY IT, listen to it, and turn it into a B2 if you think the midrange is too hot, but you might want to look to the K55 driver, since yours is an EV ceramic magnet version and not an Atlas with Alnico magnet version. This also the reason why I recommend Bob Crites Autoformer for the mid and tweeter horns, because we need to run the least efficient driver (always the woofer) without attenuation, and bring down the other two to match. Bob's Autofomer allows -1 db steps rather than -3db steps for attenuations and mid cap tunings. Use salt sparingly! LOL. 1 Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.