longdrive03 Posted September 9, 2007 Share Posted September 9, 2007 Anyone ever double up the 12" Heresy woofer to get higher output? What about wiring two woofers in parallel to get a 4 ohm load and installing one in a seal box and the other in a ported box. The woofer specs really favor a ported box. Any problems with this alignment? I realize you could build a Cornwall to get more output and lower bass but I have 12" woofers and not a 15" woofer. Could still add a sub for extra low support. Quote Link to comment Share on other sites More sharing options...
jwc Posted September 9, 2007 Share Posted September 9, 2007 I have thought of that idea several times. Just put the woofers very close together one on top of another. The Crossover will be guesswork w/o any testing. Would love to see pictures of your project. jc Quote Link to comment Share on other sites More sharing options...
longdrive03 Posted September 9, 2007 Author Share Posted September 9, 2007 Thanks for the reply. How are those K-31-E's doing? Can't you just alter the stock klipsch 2.5mh and 68 uf cap network for 4 ohm operation?? Surely there's a name for this arrangement (Stop calling me Shirley!!!) Thanks. Quote Link to comment Share on other sites More sharing options...
jwc Posted September 9, 2007 Share Posted September 9, 2007 The K31's are in storage. I haven't used them yet. Yes you reverse calculate the values for 1/2 the impedance. The two woofers running together will extend the frequncy response on the high end some. May not be audible. jc Quote Link to comment Share on other sites More sharing options...
djk Posted September 11, 2007 Share Posted September 11, 2007 "Anyone ever double up the 12" Heresy woofer to get higher output?" Been there, done that. "What about wiring two woofers in parallel to get a 4 ohm load and installing one in a seal box and the other in a ported box. The woofer specs really favor a ported box. Any problems with this alignment?" Put both woofers in a common volume of about 5.8 cu ft with an Fb of about 33hz. This will be flat in room to about 30hz with a touch of EQ. Wire the network up like a type B to start with. I added an all-pass delay to the woofers to delay them with respect to the midrange horn. They sound better than a Cornwall. Quote Link to comment Share on other sites More sharing options...
longdrive03 Posted September 11, 2007 Author Share Posted September 11, 2007 I assume you used a SEALED 5.8cf cabinet?? Care to share the all-pass delay design????? Thanks. Quote Link to comment Share on other sites More sharing options...
longdrive03 Posted September 11, 2007 Author Share Posted September 11, 2007 What T/S values are you using for your calculations? Using the ones I have on the KP-22-E woofer doesn't come up with anything close to the size and Fb. Quote Link to comment Share on other sites More sharing options...
DrWho Posted September 12, 2007 Share Posted September 12, 2007 A dual 12" Heresy seems a lot like the KLF-30....except the KLF-30 has a better squawker and tweeter.... Quote Link to comment Share on other sites More sharing options...
djk Posted September 13, 2007 Share Posted September 13, 2007 "A dual 12" Heresy seems a lot like the KLF-30....except the KLF-30 has a better squawker and tweeter...." I used an SBB4 alignment (best transient response of all the vented alignments). Adding the EQ makes it a C6 (smallest, most bass extension, most efficient vented system). The KLF-30 used the same midrange driver as the Heresy did after about 1980, the tweeter is better than the pre-85 Heresy. I used an Atlas mid on an EV horn and a different tweeter. All told I built six pair of these. Quote Link to comment Share on other sites More sharing options...
j-malotky Posted September 15, 2007 Share Posted September 15, 2007 I use dual K22's in my Heritage HT center channel. Mine are in two sealed Heresy boxes. Keeps up with my with my Khorns to the 80 hz just fine, which is all you need for HT. I think the upper bass has a better live sound than the Khorns. So, yes, the dual K22 is a good option. JM Quote Link to comment Share on other sites More sharing options...
DrWho Posted September 16, 2007 Share Posted September 16, 2007 I'm sure you're right about the driver, but the KLF-30 is using the (K640?) tractrix horn. The K79 tweeters I've measured tend to have better high frequency extension than the K77. Quote Link to comment Share on other sites More sharing options...
jacksonbart Posted September 16, 2007 Share Posted September 16, 2007 I'm sure you're right about the driver, but the KLF-30 is using the (K640?) tractrix horn. The K79 tweeters I've measured tend to have better high frequency extension than the K77. does the khorn still sound tubby? Quote Link to comment Share on other sites More sharing options...
DrWho Posted September 16, 2007 Share Posted September 16, 2007 Not really with the latest AK network (AK-4?)...Roy took out that several dB hump in the ~150Hz - 200Hz region. Quote Link to comment Share on other sites More sharing options...
djk Posted September 17, 2007 Share Posted September 17, 2007 "I'm sure you're right about the driver, but the KLF-30 is using the (K640?) tractrix horn." In Reply to: Re: Radial tractrix horns posted by freddyi on August 10, 2002 at 17:23:28: The K703 Tractrix horn may be crossed at 700hz. It was used in the KLF20/30 with a phenolic midrange driver and a tweeter. It was also used with a 2" VC wide range aluminum diaphragm compression driver, without a tweeter, in the now defunct Epic series. Ordered as a repair part from the service department for "your freight damaged KLF20/30," the Klipsch part number is 130024 and the MSRP is $30. If a bunch of you try this, get your sh*t together first. Don't all order the same thing on the same day. And don't all ask for a 130024. Remember that this horn was used in the KLF20, KLF30, and Epic CF2. They might jack up the price if they think people want it. Most of their other horns are big bucks. Quote Link to comment Share on other sites More sharing options...
Andy W Posted September 17, 2007 Share Posted September 17, 2007 1. I would check the impedance curve of the Heresy woofer before putting two of them in parallel... It might not be very amp friendly 2. One sealed and one ported might not work very well unless you put a high pass on the sealed woofer and use it like a tapered array, which kind of defeats the purpose of using two woofers to begin with. The phase response of the ported woofer would not be the same as the phase repsonse of the sealed woofer and you would end up with peaks and dips in the bottom end. YMMV. Quote Link to comment Share on other sites More sharing options...
djk Posted September 17, 2007 Share Posted September 17, 2007 "It might not be very amp friendly" A pair of K22E is above 4 ohms with the woofer inductor. "One sealed and one ported might not work very well " Agree. Quote Link to comment Share on other sites More sharing options...
longdrive03 Posted September 21, 2007 Author Share Posted September 21, 2007 Does the K703 have 3 bolt pattern? I've got some of these horns I believe but I'll have to check the number. They are a 7 x 10" tractrix horns. I've got some photos but don't know how to post. Quote Link to comment Share on other sites More sharing options...
Andy W Posted September 21, 2007 Share Posted September 21, 2007 It might not be very amp friendly" A pair of K22E is above 4 ohms with the woofer inductor. Impedance curve of a single K-28-E (Heresy III) shows minimum of 4.9 Ohms at ~200Hz. Quote Link to comment Share on other sites More sharing options...
djk Posted September 21, 2007 Share Posted September 21, 2007 "Using the ones I have on the KP-22-E woofer " 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.