ASS System refurb |
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jbl_man
Moderator Group Joined: 12 January 2005 Location: London. Status: Offline Points: 11154 |
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Especially with Four 2440's or Gauss HF4000's on the back....200kgs per cabinet! Ouch. |
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Be seeing you.
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SMP
Young Croc Joined: 16 March 2013 Location: East London Status: Offline Points: 1226 |
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It may still be possible to mould the horn in one process I have made such mould before they do cost a little more but do actually last longer with virtually no process deformation over time giving long term consistency of process.They do require more processes to make such moulds but I use such moulds all the time for my horn production I do not remember how the horn looks as it is so long ago since i have seen any but a quick look and a pair of dividrers and a "Mic" will tell if it is possible to do I have a horn that is "Negative" as you put it pulls like dream and it is really tight. GRP is one of my specialities give me some data and sketches on PDF if you are interested we can go from there |
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TONY.A.S.S.
Old Croc Joined: 21 February 2007 Location: United Kingdom Status: Offline Points: 6878 |
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Unfortunately, you would not be able to pull the JBL horn off the mould the conventional way because it is undercut. Try to take a look at what the horn looks like without the adaptor fixed to it. If there had been a way, I would have done it.
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Muckerbarnes1
Old Croc Joined: 20 March 2010 Location: Stroud Status: Offline Points: 2654 |
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I've also done lots of GRP. Horns, boats, cars, roofs etc.
Might I suggest we grab Ian and make a neg of his horn and then make a mould of Tony... just for old timers sake :)
Edited by Muckerbarnes1 - 05 October 2013 at 1:50am |
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Billy Dawg.
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SMP
Young Croc Joined: 16 March 2013 Location: East London Status: Offline Points: 1226 |
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i beg to differ I vaguely remember this horn but google or Grebil is not too helpful with dims so I cannot asses it for sure but I CAN PULL A NEGATIVE PROFILE!!! You may not be able to do it but I can do some very clever stuff with GRP and Polymers and composites If I am right and my vague recollections of this device it has a "Pressure Pinch" type of initial wave-guide in the Throat even if that pinch is 3o -25mm I can mould it.sometimes more it depends on the complete profile I certainly do not appreciate being told what i can do or achieve based on your skill-set but only my own but hey if you do not wish my assistance You of course do not have to accept or take advantage of my offer "Convolute Moulds" are a speciality of mine But of course you know my skills far better than I do myself as You know me and my work so well eh? i am now incensed by this and professionally insulted just because i am relatively new on here does not make any less a Pro-Audio Eng or do not posses the knowledge necessary As the saying goes "The trouble with people who think they know everything, They make us people that do look bad" I believed this was or is a "Forum" a place for debate the exchange of ideas and knowledge between members of that Forum whilst in attendance to it a each is treated with respect and there knowledge and opinions also oh well guess not |
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mooreb
Young Croc Joined: 02 July 2007 Location: London Status: Offline Points: 871 |
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Mate just because someone says it can't be done and you know it can be, theres no sense in being "incensed" or "professionally insulted" by a remark, lifes too short!
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FB LS AUDIO SYSTEMS
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SMP
Young Croc Joined: 16 March 2013 Location: East London Status: Offline Points: 1226 |
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really??? so if someone makes a statement or expresses a conceited opinion of your abilities without having a clue what they actually are as they actually know little or nothing of you or them
they do not investigate your statements or opinions on the issue in question seek to further understand those statements or opinions and how or why you can justify them but just dismiss them when you know nothing of the one that expressed them you would not be upset?? it is a Forum a place for discussion so discussion is the object and function of it that is not what occurred in my opinion which deserves some respect i do not get such attitudes on other Forums such as DIY Audio or Blueroom |
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jbl_man
Moderator Group Joined: 12 January 2005 Location: London. Status: Offline Points: 11154 |
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"i beg to differ I vaguely remember this horn but google or Grebil is not too helpful with dims so I cannot asses it for sure"
Here you go. http://www.lansingheritage.org/images/jbl/specs/pro-comp/radial-horns/page2.jpg http://www.lansingheritage.org/images/jbl/specs/pro-comp/radial-horns/page3.jpg http://www.lansingheritage.org/images/jbl/catalogs/1978-pro/page19.jpg Of course just molding the horn by itself is no good without the throat adaptor,,Tony managed to do it all-on-one with the need for a separate adapter. The required one being a 2328. http://lansingheritage.org/images/jbl/catalogs/1978-pro/page18.jpg Edited by jbl_man - 05 October 2013 at 8:56am |
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Be seeing you.
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SMP
Young Croc Joined: 16 March 2013 Location: East London Status: Offline Points: 1226 |
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thanks JBL man for this info I will check it out
I still contend that with the advanced techniques I use for moulds i may still be able to negate the need for the adapter but it is so long since I have seen a gerbil Horn or used any since the 80's besides the 2344's I have on some custom monitoring for my now decommissioned Recording Studio it is difficult to recall the profile but I cannot imagine the profiling would be so drastic so as to preclude it hopefully it will give me the data i need to see if this at all possible now only from an interest point of view unless there ever proves a good fiscal reason to pursue it and so a need to make such a mouldor if it is I will do it just to be pedantic and prove a point |
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SMP
Young Croc Joined: 16 March 2013 Location: East London Status: Offline Points: 1226 |
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hmmm the 2" 50mm to square one!!! would like to have one in the physical to check but certainly blew the cobwebs out with the last link you give in post
i reckon it is a can do at this stage still unlike many I am an expert in many disciplines relating to Audio electronics and electrocoustics I made the decision long ago to be "A Jack of no trades, just a master of many" This does mean i can do it all and i mean all in-house this way I do not need to trust or rely on anyone else I have only the one patent to my name which was fun in some ways but not in others but that is a whole different story to wit I say I learned from it at least I will investigate this coz as i understood it someone is doing something highly commendable with them for which as an old's cool guy myself they have my support and my blessings |
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jbl_man
Moderator Group Joined: 12 January 2005 Location: London. Status: Offline Points: 11154 |
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Here is a photo i found of the 2350 with the 2328 2" adapter mounted on it,if that helps?
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Be seeing you.
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TONY.A.S.S.
Old Croc Joined: 21 February 2007 Location: United Kingdom Status: Offline Points: 6878 |
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Well I can see this is going to be fun. When you finally realise what the shape consists of, you will see that you cannot pull the horn straight off a one piece mould, which is what I was talking about in the first place. If I wanted to do it I would use a separate piece for the top section, which would meet at the crest of the shape which or course is its narrowest point. The top piece would then be split into two sections and have a third piece, probably wedge shaped that would push the two outside pieces into place. This method is the only way the top part of the mould can be formed. When the horn is ready to be pulled off, the centre piece is taken out which would then be through the centre of the throat. This in turn releases the two side pieces which form the shape of the first part of the throat. Once these are out, it then becomes a straight pull off.
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