Daan Posted May 14, 2013 Author Share Posted May 14, 2013 I used flared ports as recommended by people who build reflex cabs on a regular basis. Quote Link to comment Share on other sites More sharing options...
Daan Posted May 14, 2013 Author Share Posted May 14, 2013 One panel mounted for fitting. BTW; the ALK filters did not fit easily into the upper section anymore as I also opened the doghouse. Later I put them on a nice speakerstand next to the cabs, between the cab and amp which made a very short speakerwire possible and finetuning on the crossovers themselves. The ALK 's are beautifull to look at anyway, so no prob. here.... The closed backs look just the same as the ported ones, with a set of WBT speakerterminals in the middle. I dyed them with teak-oil later which made them look almost OEM. Quote Link to comment Share on other sites More sharing options...
Daddy Dee Posted May 14, 2013 Share Posted May 14, 2013 Nico. nice looking work. OEM is exactly what I was thinking. Quote Link to comment Share on other sites More sharing options...
ClaudeJ1 Posted May 20, 2013 Share Posted May 20, 2013 Am I correct in assuming you are crossing the horn/driver at 500 Hz.? It loses pattern control at 630 according to horn lens specs. The 500 Hz. limit is the driver not the horn. Quote Link to comment Share on other sites More sharing options...
Daddy Dee Posted May 20, 2013 Share Posted May 20, 2013 ClaudeJ1, Would you say more about crossing at 500hz? I may not be tracking the conversation correctly, and apologize in advance if so. Doesn't Klipsch cross the K-55 at 400hz? If i'm understanding your post, that would pose some detriment to the sound. right? Quote Link to comment Share on other sites More sharing options...
Axz Hout Posted May 20, 2013 Share Posted May 20, 2013 h Quote Link to comment Share on other sites More sharing options...
Daan Posted May 20, 2013 Author Share Posted May 20, 2013 I will keep on using the system as a three-way with the tweeter on top of the cabinet. Although the horn specs show it will not go low enough, integration of the midrange as well as musical details are much better using this horn over the much smaller Fastrack. The fastrack however is THE drop-in replacement horn for those who do not want to change the orignality of their La Scala's. Just completed the make-over this evening and I'm very pleased with the appearance as well with the sound, only not sure I'll keep the K43E ; it does exactly as described earlier as having more "body" in the 400Hz region which in my case is a bit too much. More listening to do and finetuning. Nico Quote Link to comment Share on other sites More sharing options...
Marvel Posted May 20, 2013 Share Posted May 20, 2013 I would love a pair of those EV horns... Bruce Quote Link to comment Share on other sites More sharing options...
Axz Hout Posted May 20, 2013 Share Posted May 20, 2013 h Quote Link to comment Share on other sites More sharing options...
ClaudeJ1 Posted May 20, 2013 Share Posted May 20, 2013 ClaudeJ1, Would you say more about crossing at 500hz? I may not be tracking the conversation correctly, and apologize in advance if so. Doesn't Klipsch cross the K-55 at 400hz? If i'm understanding your post, that would pose some detriment to the sound. right? Since the EV horn is shorter and loses pattern control at 630., they do say that the limitation is the EV driver that mates with it. You can probably get away with a K55 at 400 hz on that short of a horn, but it would be subject to measurement, which I would do if it were my setup. Having measured countless horn/driver combinations, I say that without proper instruments you can't know for sure. For example. The K55 with the K401 vs. the K700 on a Heresy yields a different curve down low, even though the driver can go down lower than 400 Hz. the horn cuts off way above that (unloads), so it's then a tiny direct radiator at that point............more distortion. Speaking about the Belle in particular, PWK himself told me that after he designed the K-500 for the Belle he said the K400 was a lot longer than it needed to be. Measuring is the only way to tell no matter what. Quote Link to comment Share on other sites More sharing options...
djk Posted May 21, 2013 Share Posted May 21, 2013 " Since the EV horn is shorter and loses pattern control at 630." The 1/4W depth of the HR60 is enough to cross over at 450hz (this is one octave above the 1/4W frequency), the HR90 is deep enough for 500hz. The Di for theHR60 only opens up 1.1dB from 1Khz to 500hz, the HR90 is actually 0.2dB higher at 500hz than it is at 1Khz. The Di of the HR90 is ±3dB from 500h~16Khz (H+V combined). The HR90 is wider, at 23.9". I have one pair of HR60 and the throat adaptors for 1-3/8" drivers, and five of the HR90. EV DH7 on HR90 with JBL 4508 tuned to 28hz (one port blocked) with Eminence Magnum drivers. Quote Link to comment Share on other sites More sharing options...
John Warren Posted May 21, 2013 Share Posted May 21, 2013 Why the Eminence drivers? Quote Link to comment Share on other sites More sharing options...
Deang Posted May 21, 2013 Share Posted May 21, 2013 "Also the K55V driver drops off rapidly past 5000 cps." I agree that a tweeter is required with this driver, but where it dies off is horn dependant. If the verticals are collapsed, you can squeeze another 1000 cycles out of it. Quote Link to comment Share on other sites More sharing options...
Daan Posted May 21, 2013 Author Share Posted May 21, 2013 This thread is going...I don't know where to, but here some more pics of the HR60 build. After filling the back of the "front expansions of the horn" so to speak, and covering the horns with liquid rubber. Also added rope caulk to the 13/8 adaptors. Quote Link to comment Share on other sites More sharing options...
Daan Posted May 21, 2013 Author Share Posted May 21, 2013 Here's one of the horns installed, the horn is supported by a silent block which is under just a bit pressure. I hope this reduces vibrations going from the basshorn into the midhorn. Quote Link to comment Share on other sites More sharing options...
Daan Posted May 21, 2013 Author Share Posted May 21, 2013 And this is the front, waiting for the gasket to set before I can fill in the thin free space around the flange left on purpose; this space is filled with wood-coloured elastic putty. This way the only physical contact between the EV horn and bassbin are the four screws through the front flange. Even the vibrations coming through here will be absorbed by the thick foam gasket underneath the flange of the EV horn.... I'v heard the [bad] effects of vibrations before and always try to avoid them since. Experimenting with the Beyma CP25 and Crites CP125 this evening. Quote Link to comment Share on other sites More sharing options...
Daddy Dee Posted May 21, 2013 Share Posted May 21, 2013 looks very nice. will be looking forward to hearing your take on CP-25 and CT-125. Quote Link to comment Share on other sites More sharing options...
Daddy Dee Posted May 21, 2013 Share Posted May 21, 2013 Thanks for your take ClaudeJ1 Quote Link to comment Share on other sites More sharing options...
djk Posted May 22, 2013 Share Posted May 22, 2013 Why the Eminence drivers? They are a nice driver, especially for the $75 each (NOS) I got them for. The (free) JBL 4508 cabinets were left over from the JBL tent sale after the drivers were sold off, it cost $100 to go collect them from out of state. Quote Link to comment Share on other sites More sharing options...
reinderspeter Posted May 26, 2013 Share Posted May 26, 2013 Great project, Nico! I hope to hear them soon Quote Link to comment Share on other sites More sharing options...
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