moray james Posted July 17, 2015 Share Posted July 17, 2015 Dave makes a very good point and at the very least finding a woofer that can cross higher is a good plan as it provides you with the ability to build a wider range of speaker systems such as very loud but cheap systems where you want the woofer to take on the heavy work to insure your compression driver will last. I think that quality here in all your projects is well worth the extra cost as it insures your designs last and they don't often require service. It was upon such quality that Tannoy, JBL and Altec built their reputations. Do it right do it once. Best regards Moray James. Quote Link to comment Share on other sites More sharing options...
karlson3 Posted July 17, 2015 Share Posted July 17, 2015 regarding the Karlson tube waveguide, a good start is to make one the size of Transylvania Power Company's "The Tube" - 1 inch diameter, ~5.3" long, a 0.125" starting gap at its throat and a half-ellipse pattern - they are normally tilted up or down from horizontal as theres a mix of two directivites - - I'm not sure what Faerber accomplishes with a long tube other than the ability to keep time and have the tube protrude through a round midhorn's wall. It would take a few tubes and measuring to find out. Paper could be used a proof of concept. a wider baffle at the compression driver could offset some loss on the low end due to small dimensions invovled 2 Quote Link to comment Share on other sites More sharing options...
grindstone Posted July 18, 2015 Share Posted July 18, 2015 Heya Freddy! Cool to see you here-abouts. Didja lose the first 2 K 'nyms here in the last few decades? : ) Carry-on : ) Quote Link to comment Share on other sites More sharing options...
djk Posted July 18, 2015 Share Posted July 18, 2015 Nice looking K-12 Fred. For a 100hz cross for PA, would I be better off trying to build a 12" Rocket or a K-12 do you think? Quote Link to comment Share on other sites More sharing options...
Arash Posted August 3, 2015 Author Share Posted August 3, 2015 another issue itching mind mind is that non-Ti CDs sound smoother to my ear so I tend more toward polymers diaphragms. HF140 (Titanium) response: HF 144 (Ketone polymer): HF 146 (Ketone polymer): the low end of all three drivers look like the same. HF144 seems more linear. HF140 have a little bit better top end but there is also a deep/hump around 15Khz. I don't see a point why wouldn't I use HF144 over HF140. any idea? I really need comments about HF140 vs. HF144/HF146 as I'm about to finalize the list of my order. Quote Link to comment Share on other sites More sharing options...
moray james Posted August 4, 2015 Share Posted August 4, 2015 the response of the 146 would at the least have me interested enough to want to hear a pair. 1 Quote Link to comment Share on other sites More sharing options...
djk Posted August 4, 2015 Share Posted August 4, 2015 I have the 140 and 146 (and some of the smaller HF) I chose the 146 because it is smoother in the 1.5Khz region. The 140 is OK for PA, it adds a bit of 'tizz' on top for systems lacking in definition. Quote Link to comment Share on other sites More sharing options...
Arash Posted August 10, 2015 Author Share Posted August 10, 2015 has anybody here any experience with Beyma 15XA38ND 15" coax? it seems interesting and there are some good comments of people preferring it over Tannoy concentric driver. Quote Link to comment Share on other sites More sharing options...
Zoef Posted September 22, 2015 Share Posted September 22, 2015 Arash, I just read this. I was looking into a project using this driver. (on other forum) I got following reply from a user: Check out these designs:Caveman 15 - TQWT with 15XA38NdSweden's No Frills Audio Introduces The Caveman Loudspeaker | Ultra High-End Audio and Home Theater ReviewWizard High-End Audio Blog: No-Frills-Audio Caveman 15www.audioexcite.com Sweetspot Stockholm 2013Inner Magazine - Stockholm Highend Mässä 2013 - Part IIIMonitor 38 - 125L with xo 1200Hz (the highest I'd go!)Monitor 38 (download the prospect for cabinet drawings)Beyma XA38 von Oliver P.Blog with various simulations (BR, sealed, LWT etc)DIY Audio Blog: August 2013 Quote Link to comment Share on other sites More sharing options...
ClaudeJ1 Posted September 26, 2015 Share Posted September 26, 2015 on-Ti CDs sound smoother to my ear so I tend more toward polymers diaphragms. I agree with this notion also. Quote Link to comment Share on other sites More sharing options...
Zoef Posted October 4, 2016 Share Posted October 4, 2016 Hate to reply on a old topic, Like you stated in point 2 about the 15pr400: could be used down to f3 38hz in a ~190l ported cabinet. this speaker sure reminisces Bob's Style D Cornscala. I want to try something like this. Arash, would you happen to have a cabinet design like you stated that i can use ? Or anyone else? Quote Link to comment Share on other sites More sharing options...
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