feket663 Posted July 12, 2009 Share Posted July 12, 2009 I'd like build a Cornscala with APT150 supertweeter and Atlas PD5 VH mid driver on the Altec 511b midhorn for my home built SE 2a3 monoblocks (I don't like loud music..., enough about 100 dB/1W speaker ). The problem is the woofer. I find this speaker: Eminence Kappa-15LFA. 8 ohm. Parameters: Le: 1.27 mH *Impedance: 8 ohms *Re: 5.4 ohms *Frequency range: 38-2,700 Hz *Magnet weight: 95 oz. *Fs: 39 Hz *SPL: 99 dB 1W/1m *Vas: 5.6 cu. ft. *Qms: 6.08 *Qes: 0.41 *Qts: 0.38 *Xmax: 5.5 mm The question: can I use this woofer and which modifications necessary in the x-over? (i know the original x-over made for 4 ohm speakers.) Unfortunately, the original or Crites's woofer shipping cost is very expensive from USA , however, this woofer can be obtained cheaply in Europe. Plese help me! Istvan from Hungary. sorry for my bad English. Quote Link to comment Share on other sites More sharing options...
Guest David H Posted July 12, 2009 Share Posted July 12, 2009 This woofer would be a better choice, its 4 ohm and hopefully available in your area. Eminence Kappa-15C 15" Driver 4 Ohm Welcome to the forums. Quote Link to comment Share on other sites More sharing options...
feket663 Posted July 13, 2009 Author Share Posted July 13, 2009 kg4guy: Thanks for help! GotHover: I examined the Eminence Kappa15C driver, but I read the tech. datas and the freq. response just go only 63 Hz in large vented box built by factory recommendations. I'd like good, low bass extension. This discipline better the Kappa 15 LFA. Thanks for welcome!!! Quote Link to comment Share on other sites More sharing options...
Guest David H Posted July 13, 2009 Share Posted July 13, 2009 Ok then I suggest you take a look at the Kappa Pro-15, because the 15LFA is not going to have enough SPL for your application. I also urge you to look at the manufacturers graphs on these drivers from 20-600hz rather than the printed specs. Quote Link to comment Share on other sites More sharing options...
rogerwilco82 Posted July 14, 2009 Share Posted July 14, 2009 Kappa Pro-15A or LF-2 ? Have you used the Kappa 15C? How would you describe the lower end? I also heard of someone built a LaScala with an Kappa 15A. I'm wondering if the difference would be big. Another question: Do you know other midrange horns that would fit? Quote Link to comment Share on other sites More sharing options...
Guest David H Posted July 14, 2009 Share Posted July 14, 2009 The woofers I reccomend are the original K-33 available from the Klipsch parts dept, or the woofers from Bob Crites. If you are looking for a touch more bass, go with the Crites cast frame woofer. The only reason I suggested the Eminence is because of the exceedingly high international shipping cost. If you are in the U.S. I would stick with the tried and true. Another question: Do you know other midrange horns that would fit? Yes, I have got a few ideas on horns. Quote Link to comment Share on other sites More sharing options...
rogerwilco82 Posted July 22, 2009 Share Posted July 22, 2009 I guess I'll go for the Kappa Pro 15A. This woofer looks really good on the sheet as I would expect from a PRO series [] Is the original woofer 8Ohm or 4Ohm? Can I use 4 and 8Ohm with the same crossover? Quote Link to comment Share on other sites More sharing options...
Guest David H Posted July 23, 2009 Share Posted July 23, 2009 I guess I'll go for the Kappa Pro 15A. This woofer looks really good on the sheet as I would expect from a PRO series Is the original woofer 8Ohm or 4Ohm? Can I use 4 and 8Ohm with the same crossover? The original woofer is a 4 ohm. The factory type B crossover uses a 2.5mH inductor on the woofer, and crosses at 600hz.The Kappa pro-15 is 8 ohm. the correct value for 600hz as dictated by a crossover calc is roughly 2.5mH. The crossover calc would lead me to believe the Cornwall crossover is better suited for an 8 ohm driver than the original 4 ohm. I really dont have a good answer to you question. Hopefull a crossover expert will step in and clarify. Quote Link to comment Share on other sites More sharing options...
rogerwilco82 Posted July 23, 2009 Share Posted July 23, 2009 I don't get it. It sees that it makes no difference. Is this right? BTW: Bobs PH-800 horn is better known as "McGee HL-616". Just saw this one. Pair goes for 25$! Quote Link to comment Share on other sites More sharing options...
Guest David H Posted July 23, 2009 Share Posted July 23, 2009 I don't get it. It sees that it makes no difference. Is this right? Inductor changes will have an effect on frequency, I just don't have the answer you are looking for. Johnny 5 is using the Pro 15 in his Cornscala's and uses a 2.2mH and sounds excellent. Quote Link to comment Share on other sites More sharing options...
rogerwilco82 Posted July 23, 2009 Share Posted July 23, 2009 Ok. So i need an adjusted crossover. When I buy the crites crossover I would get 2.5mH, right? So where can I buy a 2.2mH crossover? Quote Link to comment Share on other sites More sharing options...
rogerwilco82 Posted July 26, 2009 Share Posted July 26, 2009 anyone? Quote Link to comment Share on other sites More sharing options...
Al Klappenberger Posted July 26, 2009 Share Posted July 26, 2009 Roger, You are getting no answer becasue you are asking the wrong question! It's like asking where can I get a 13.5 inch engne for my Ford car. Al K. Quote Link to comment Share on other sites More sharing options...
rogerwilco82 Posted July 27, 2009 Share Posted July 27, 2009 Sorry but I got those advices from here! Some are using Kappa C, some the Pro series. They all say there is no big difference. So you say it is a huge difference? Because an 13.5 inch engine for a car really sucks. Quote Link to comment Share on other sites More sharing options...
Guest David H Posted July 27, 2009 Share Posted July 27, 2009 Maybe I need to reiterate. The woofers I reccomend are the original K-33 available from the Klipsch parts dept, or the woofers from Bob Crites. If you are looking for a touch more bass, go with the Crites cast frame woofer. The only reason I suggested the Eminence is because of the exceedingly high international shipping cost. If you are in the U.S. I would stick with the tried and true. I am not endorsing the use of the Kappa Pro or 15C, I have however seen both of them used successfully. If you choose to use woofers other than the O/E or suitable replacement, you may have to modify your crossovers due to impedence changes. I have not run any tests on the woofers disgussed, therefore I do not know what crossover changes need to be made. Quote Link to comment Share on other sites More sharing options...
rogerwilco82 Posted July 27, 2009 Share Posted July 27, 2009 Yes, I know what you said. I saw several CW3 and LaScalas on this Forum using the different Kappa woofers, that's why I thought it should not be a big problem. You already told me that there would be maybe an change on the crossover, I just thougt someone of those users I saw maybe know what to change. Can't be that big thing. I mean...the K-33 and the Crites woofer are both from Eminence afaik. When you all think it will not work, then I have to handle the high shipping costs to Europe. I just want to be sure that I have to. Quote Link to comment Share on other sites More sharing options...
JohnA Posted September 19, 2009 Share Posted September 19, 2009 I'd like build a Cornscala with APT150 supertweeter and Atlas PD5 VH mid driver on the Altec 511b midhorn for my home built SE 2a3 monoblocks (I don't like loud music..., enough about 100 dB/1W speaker ). The problem is the woofer. I find this speaker: Eminence Kappa-15LFA. 8 ohm. Parameters: Le: 1.27 mH *Impedance: 8 ohms *Re: 5.4 ohms *Frequency range: 38-2,700 Hz *Magnet weight: 95 oz. *Fs: 39 Hz *SPL: 99 dB 1W/1m *Vas: 5.6 cu. ft. *Qms: 6.08 *Qes: 0.41 *Qts: 0.38 *Xmax: 5.5 mm The question: can I use this woofer and which modifications necessary in the x-over? (i know the original x-over made for 4 ohm speakers.) Unfortunately, the original or Crites's woofer shipping cost is very expensive from USA , however, this woofer can be obtained cheaply in Europe. Plese help me! Istvan from Hungary. sorry for my bad English. There is a new version 15LF-2. It will be an EXCELLENT woofer. Since you are building your own speaker, you will need a crossover designed just for it, don't automatically use the Klipsch network. For your small tube amps an 8 ohm woofer is better. However, don't stop with just one, use 2 in each cabinet. You will get 102 to 104 dB @ 1 watt @ 1 meter! Since you have 511Bs, I highly recommend picking up a pair of Altec 902-8B drivers and building it as a 2-way system. The 902 is 106+ dB on a 511B, with a hump below 2k Hz. The crossover below trims off the hump and crosses at 1k. Here is the Computer predicted response and I would say it sounds like this. I don't think you will think is sounds "soft" or want a tweeter. I designed the crossover using Xover Pro from Parts Express. You might want to play with the design a little to lower the crossover point and remove the peak the 15LF-2 has in the midrange. Here is the response of a 902-8B in a 511B, as tested and posted by Shawn Fogg on this Forum. Note the hump. If you remove it with the crossover the very high frequencies are right up there where you want them. Quote Link to comment Share on other sites More sharing options...
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