InVeNtOr Posted June 16, 2009 Share Posted June 16, 2009 well i am thinking of building me a pair of Cornscalas. sounds like fun if i can pony up the dough! here is what i plan on doing. building a pair of towers 45" (h) x 17" (w) x 18.25" (d) {should be 6.54 cu. ft.} use the veneer i have to do the finish work. bob crites 15" sub woofer apt150 tweeter (from parts express) atlas pd-5vh mid driver alk eng cornscal crossover (thinking of building a circuit card, but starting to give me headaches). solen caps and resistors sonic craft caps (2.2uf and 4.3uf) bob crites autotransformer #3619 what i am missing is the mid range horn. i can buy some wooden ones from alk eng or GotHover, but were talking $400 neighborhood. i would like to see if there was something that doesn't put this project out of reach. i am having difficulties finding a horn that goes down to 400hz. i have found several different horns but they don't list the Hz so i pass them up. bob crites sells a ph-800 but 2 problems with that, too big and doesn't list Hz. i also need a horn less than 15" in width. i found one horn, not too cheap, $80 ea but so far it seems to be the only one. it's P.Audio PH3616. JBL or P.Audio (copy) 2370A or PH 2370 would also work, but it's a little too big. does anyone have any horns that would be less expencive and go down to 400Hz? any help to get this Cornscala monster up and running would be appreciated! Quote Link to comment Share on other sites More sharing options...
Johnny's Jill Posted June 17, 2009 Share Posted June 17, 2009 You really need to re-consider the spending the extra $$$ and get the wooden tractrix horn. I think gothover has one that might fit in your box. There are also a few threads on how build your own if you are handy with woodwork. All of the plastic horns I have tried are shouty and harsh, in fact I was ready to give up on horns, then gave the fastrac 400 a shot with ALK crossovers. Now you couldn't pry them from me. The P-Audio 3616 has an fc of 500hz, that would be good for a Cornwall, not sure its low enough for Cornscala. Good luck on the Cornscala Craig Quote Link to comment Share on other sites More sharing options...
InVeNtOr Posted June 17, 2009 Author Share Posted June 17, 2009 from what i understand the wooden horn is the best to go with. when you buy everything all at once, it's pretty expencive. i may have to put off the veneer work to pay for the horn. Quote Link to comment Share on other sites More sharing options...
InVeNtOr Posted June 17, 2009 Author Share Posted June 17, 2009 p.audio has another ph-2380, it goes down to 400Hz, but it's a 2" driver. i have no clue which driver to use for 2" any suggestions? it costs $120 Quote Link to comment Share on other sites More sharing options...
Blvdre Posted June 17, 2009 Share Posted June 17, 2009 It sounds like you're trying to keep costs down, so a 2" driver would not be the way to go. You may have to settle on a higher crossover point, given the width of your baffle and which horns it can accomodate, which would not be a terrible thing. Quote Link to comment Share on other sites More sharing options...
Deang Posted June 17, 2009 Share Posted June 17, 2009 Al has dropped the price on his horn. I would save for the good horn. If you don't want to do that, then consider that crossing over at 400Hz doesn't necessarily result in a better sound than crossing over at 800Hz. Quote Link to comment Share on other sites More sharing options...
InVeNtOr Posted June 17, 2009 Author Share Posted June 17, 2009 well i changed my mind a little, i am going to have to save up for the horn. it makes no sence to compermise and horn size when it's the most important speaker. the only reason i wanted a smaller horn is i wanted the Cornscala to be 17" wide, well now it's going to be 17.75" so not that big of an issue. ALK suggested i use the 902-16a driver, so i guess that's what i am going with. Quote Link to comment Share on other sites More sharing options...
Blvdre Posted June 17, 2009 Share Posted June 17, 2009 That's a nice driver. Are you going to run it as a two-way system? The 902 has a very nice high-end, and you'd save on having to buy a tweeter. Quote Link to comment Share on other sites More sharing options...
InVeNtOr Posted June 18, 2009 Author Share Posted June 18, 2009 no, i was still going to use it for the mid. i'll use the apt150 for the tweeter. Quote Link to comment Share on other sites More sharing options...
aj01 Posted June 18, 2009 Share Posted June 18, 2009 I've started researching the same thing... First started with a set of Forte's and basic upgrades, now starting on a pair of cornwalls. I've heard a set of the older Altec vott's, so I'm probably leaning that way, but I'm curious about the 2" drivers and above (although they are probably out of my price range right now). mid range horns generally increasing in price: PH-800 (crites) altec 511b (811b with higher crossover) gothover fastrac alk trachorn 400 JBL 2380A fc260 Edgarhorn, 510/402 jubscala? Quote Link to comment Share on other sites More sharing options...
InVeNtOr Posted June 18, 2009 Author Share Posted June 18, 2009 what crossover are you going to use? bobs or ALK's? Quote Link to comment Share on other sites More sharing options...
InVeNtOr Posted June 18, 2009 Author Share Posted June 18, 2009 conserning the 902, now that i have read your comment again, Blvdre, i am not sure. i'll ask ALK if that is possible or even a good suggestion. i really don't want to mess with his schemitic. it seems like he took a lot of time to make sure it was done right. seems wrong to cut and splice it. it would save money, but i am going to try and build an outstanding tower speaker. i want to make sure i do it all right, because if for some reason it just won't work in my current set up, i want to be able to sell them. i know i wouldn't buy something someone made, if they just "threw it together." Quote Link to comment Share on other sites More sharing options...
aj01 Posted June 18, 2009 Share Posted June 18, 2009 missed a couple of posts there... Quote Link to comment Share on other sites More sharing options...
Blvdre Posted June 18, 2009 Share Posted June 18, 2009 I think Al would agree that it's a good suggestion, as the 902 was designed for two-way operation; not that it wouldn't shine in a three-way design. The crossover would need to be modified, though. Quote Link to comment Share on other sites More sharing options...
Deang Posted June 19, 2009 Share Posted June 19, 2009 You can go two-way with the 902, but all of these popular aftermarket horns collapse the vertical with increasing frequency. Sound we hear in a room is a combination of off-axis and on-axis energy. If the off-axis energy doesn't have the same uniformity as the on-axis energy, it results in an uneven power response. Speakers with an even power response sound better. I suggest you go three-way. Quote Link to comment Share on other sites More sharing options...
Deang Posted June 19, 2009 Share Posted June 19, 2009 Schematic for my "CornScala" network supporting the 902 on Al's Trachorn with the Beyma CP-25 tweeter. Eminence APT-200 or APT-150 can also be used. Quote Link to comment Share on other sites More sharing options...
InVeNtOr Posted June 22, 2009 Author Share Posted June 22, 2009 that's a much simplier schamatic than Al's. i would like to keep it a 3 way speaker, something i have been wanting. i also don't want to mess with Al's schamatic at all. from talking to him, it's set up just right so any changes will yeild not as good results. Quote Link to comment Share on other sites More sharing options...
InVeNtOr Posted June 22, 2009 Author Share Posted June 22, 2009 too keep evenone in the loop of what i have planned, here is a 3D pic of what i would like to build. it's a sealed cabinet design, with the back removable. the ALK horn goes from edge to edge (don't know if that is possible) giving it "split" look. cornscala tower.pdf Quote Link to comment Share on other sites More sharing options...
InVeNtOr Posted June 22, 2009 Author Share Posted June 22, 2009 here is a 3D drawing of the grill i would like to have. it's a modified RF-7 design. it's a stand off grill but with magnets. also the grill has to wrap around the speaker a little because of the mid horn going to the edge of the speaker. it's a "little out there" design, but it gives it a unique look, to me anyways. i'm not sure if it's possible to build, but i'll let my cabinet build run loose with it and see what happens. i may have have a 1/8th piece of wood and large cuts outs wrapped in speaker grill fabric, or maybe 1/4" wooden braces. that would be the cabinet builders area, i'm sure he'll come up with something. cornscala tower with grill.pdf Quote Link to comment Share on other sites More sharing options...
jwc Posted June 22, 2009 Share Posted June 22, 2009 Ah the tallcorn with WAF appeal http://forums.klipsch.com/forums/p/71921/705763.aspx#705763 jc Quote Link to comment Share on other sites More sharing options...
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