greg928gts Posted February 26, 2009 Share Posted February 26, 2009 Which way is the correct way to orient tweeters like the JBL 2404H and the Beyma CP-25? I've seen pictures both ways. I did a search online and found no information about proper orientation. Pic below is of CP-25 from ALK's website. Greg Quote Link to comment Share on other sites More sharing options...
greg928gts Posted February 26, 2009 Author Share Posted February 26, 2009 Here is a pic of the JBL 2404 in the other orientation. Greg Quote Link to comment Share on other sites More sharing options...
Coytee Posted February 26, 2009 Share Posted February 26, 2009 I was under the impression that the 2404 was a 90x90 dispersion? If so, it wouldn't matter. Regardless of the actual dispersion pattern, I seem to recall the statement (from when I had mine and asked same thing) "it doesn't matter" soooooooooooooooooooo, It don't matter! [Y] Quote Link to comment Share on other sites More sharing options...
Guest " " Posted February 26, 2009 Share Posted February 26, 2009 coverage is 100X100, which would suggest it doesn't matter...looking at the graphs...the horizontal looks a little better than the veritcal off axis....problem is ...it dones not indicate which is which. 2404.pdf Quote Link to comment Share on other sites More sharing options...
mikebse2a3 Posted February 26, 2009 Share Posted February 26, 2009 Based on JBL's Frontal isobar contours plot the Babycheeks(ie: flange mounting holes top and bottom) oriented horizontal looks the most consistent. This orientation is also listed as Horizontal on the first page of the spec sheet. mike tn Quote Link to comment Share on other sites More sharing options...
colterphoto1 Posted February 26, 2009 Share Posted February 26, 2009 JBL 2404 is shown as 100x100 in their tech documentation, so either orientation would work. JBL2404.pdf Quote Link to comment Share on other sites More sharing options...
colterphoto1 Posted February 26, 2009 Share Posted February 26, 2009 Beyma's literature shows 100x60 with widest dispersion with the cheeks in the up/down position http://www.usspeaker.com/beyma%20CP25-1.htm Quote Link to comment Share on other sites More sharing options...
greg928gts Posted February 27, 2009 Author Share Posted February 27, 2009 Beyma's literature shows 100x60 with widest dispersion with the cheeks in the up/down position http://www.usspeaker.com/beyma%20CP25-1.htm So the Beyma is different than the JBL. US Speaker says it's a replacement for the JBL, so I just assumed that it would be the same. This is one of my pet peeves about companies in general, is that they don't give complete enough information on their products. Wouldn't that be a fairly important little detail to explain on your website? I looked at the orientation of the tweeter shown on the US Speaker site and on ALK's site before installing them in my new Khorn horns, and they both showed the cheeks up and down. Then I saw a picture of Cigarbum's Cornscala, and he had the cheeks side to side, and that's when the confusion started. Greg Quote Link to comment Share on other sites More sharing options...
mark1101 Posted February 27, 2009 Share Posted February 27, 2009 Think about it. CHEEKS. They are on either side of your face. Quote Link to comment Share on other sites More sharing options...
ZAKO Posted February 27, 2009 Share Posted February 27, 2009 The JBL 2404 has a verticle slot in the throat,,, and should be mounted in the verticle position,,,, JBL mounts this unit that way in all there tweeter installations,,,Also that baby cheek horn design is made in two larger sizes (2344) and the throat is in the verticle position. for a smoother dispersion pattern,,even though polor patterns look simmiler,,,, Beyma and EV throat designs are different and do not function the same. Paudio also has a large baby cheek horn without the slot throat,, and has a very poor pattern,.. Quote Link to comment Share on other sites More sharing options...
colterphoto1 Posted February 27, 2009 Share Posted February 27, 2009 'Baby Cheeks' is a rather generic term, what's to say that the manufacturers don't use different curves and therefore have different dispersion patterns? Of course they could be measuring things differently I suppose. Only a good read of the polar plots would tell the whole story. Quote Link to comment Share on other sites More sharing options...
Groomlakearea51 Posted February 27, 2009 Share Posted February 27, 2009 Think about it. CHEEKS. They are on either side of your face. Unless you are laying on your side?.... LOL!!!! [] Quote Link to comment Share on other sites More sharing options...
ZAKO Posted February 27, 2009 Share Posted February 27, 2009 Yes the throat and mouth shapes are very different on the JBL units,,, compared to the Beyma and EV... No its not a generic design,,, You have to look closely to see what each was designed for. Quote Link to comment Share on other sites More sharing options...
PrestonTom Posted February 27, 2009 Share Posted February 27, 2009 There is a proper orientation. Mike TN and Maron are correct. The slot should be vertical. Quote Link to comment Share on other sites More sharing options...
colterphoto1 Posted February 27, 2009 Share Posted February 27, 2009 Yes the throat and mouth shapes are very different on the JBL units,,, compared to the Beyma and EV... No its not a generic design,,, You have to look closely to see what each was designed for. I agree with you Maron, what I was stating that by calling all of them 'baby cheeks' we are discounting the different design philosophies and polar patterns of each design. It's the generic TERM that gets in the way of understanding. Are we in agreement that the two photos at the beginning of this thread show the correct orientation for each design? Quote Link to comment Share on other sites More sharing options...
greg928gts Posted February 27, 2009 Author Share Posted February 27, 2009 There is a proper orientation. Mike TN and Maron are correct. The slot should be vertical. For crying out loud! For which one? Sometimes it's just more confusing asking a question on this forum. Greg Quote Link to comment Share on other sites More sharing options...
colterphoto1 Posted February 27, 2009 Share Posted February 27, 2009 ONly the JBL has a slot in the throat, I think they are saying that the JBL should have the slot oriented vertically (cheeks side by side) Beyma is a different design, cheeks up and down. (you're looking at her sideways in other words LOL) Clear? Quote Link to comment Share on other sites More sharing options...
mikebse2a3 Posted February 27, 2009 Share Posted February 27, 2009 JBL cheeks horizontal (ie: mounting screw flanges Top and Bottom) The Beyma looks from their data sheet(should be made much clearer about details like this) to indicate cheeks vertical (ie: mounting screw flanges left and right). Greg since it is a 100 x 60 degree horn I believe it would be pretty easy just to run some high frequency pink noise through the horn and confirm for yourself which orientation gives you the 60 degree dispersion which of course you will want to use vertically. mike tn Quote Link to comment Share on other sites More sharing options...
CIGARBUM Posted February 27, 2009 Share Posted February 27, 2009 This is confusing, so what your telling me is that I got the babies butt heading the wrong way, Geeeis, that's terrible. I wonder if I can fix the baby's butt????? Quote Link to comment Share on other sites More sharing options...
jacksonbart Posted February 27, 2009 Share Posted February 27, 2009 The gerber will come out regardless of the set up. Quote Link to comment Share on other sites More sharing options...
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