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15'' 1850s plans? |
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Matejic 
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Joined: 03 February 2011 Location: Serbia Status: Offline Points: 10 |
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 Posted: 18 March 2011 at 6:02pm |
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I want to built swesound cab and is it better to use RCF MB15N401 or PD1550 driver? tnx anyway
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biotec
Old Croc 
Joined: 07 June 2004 Location: United Kingdom Status: Offline Points: 2932 |
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Posted: 18 March 2011 at 6:06pm |
The 1550 without a doubt.
Th mb15n401 is not a proper bass driver.
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me so horny, me love you long throw.
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LjudLahger
Young Croc 
Joined: 31 July 2008 Location: Sweden Status: Offline Points: 838 |
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Posted: 08 July 2011 at 6:16pm |
Even if 1550 driver is a fine one, this does not fit this "1550 horn" as good as Eminence Kappa 15LF. No one does. I have done sims on alot of highend drivers and no one give a nice curve like kappa15LF does....good lowend (50Hz) and punch in the 110-140Hz aria... You could go with the Kappa pro and you get more X-max and X-mech but lose 1-2dB in sensitivity. I like PD but not in this one...(from my hornresp sims;)
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smoore
Young Croc
Joined: 30 March 2011 Location: N.Devon Status: Offline Points: 933 |
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Posted: 21 July 2011 at 5:39pm |
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http://www.speakerstore.nl/constructions/show/10
- What im in the process of building. Going to use kappa lf's in it too. Its only my 3rd cab build so not sure how it'l turn out, will post pics later
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LjudLahger
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Joined: 31 July 2008 Location: Sweden Status: Offline Points: 838 |
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Posted: 13 May 2013 at 11:19pm |
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I have now tryed a driver with a higher bl of 22 and it sounded more "hifi", control and more below 60hz. It's a shame that they are so hard to build :-(
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JR.junior
Old Croc
Joined: 14 December 2009 Location: Slovenija Status: Offline Points: 1789 |
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Posted: 14 May 2013 at 7:06am |
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build scoop, much more output power.
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Support the scoop technology, larger mouth plays louder!
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ovidias
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Joined: 03 April 2012 Status: Offline Points: 32 |
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Posted: 28 July 2014 at 7:33am |
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can anyone post input data for Horn resp?
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Keen
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Joined: 30 May 2011 Location: Brisbane, Aus Status: Offline Points: 1193 |
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Posted: 28 July 2014 at 8:28am |
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Approx (close enough) input data for plan on page 1.
2PI S1:300 S2:3200 L12:150 (exp) VRC:33 LRC:21 VTC:5000 ATC:200 Leave everything else as is, and put your driver info in.
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LjudLahger
Young Croc
Joined: 31 July 2008 Location: Sweden Status: Offline Points: 838 |
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Posted: 28 July 2014 at 8:38am |
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S1-453
S2-717 Con-35,4 S3-1220 Con-52,5 S4-1917,3 Con-22,8 S5-3187 Con-18,8 VRC-33 LRC-21 VTC-14000 ATC-1550
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Keen
Young Croc
Joined: 30 May 2011 Location: Brisbane, Aus Status: Offline Points: 1193 |
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Posted: 28 July 2014 at 8:54am |
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or yeah, see LjudLahger's data for simulations starting from the first fold. Personally I dont think that's as accurate (no offense intended LL). One thing with that data is ATC needs to be recalculated because the if you're taking the throat to be everthing up to the first fold then horn resp will calculate the orientation of the throat to be at right angles to the driver. won't make a difference to the response but.
e: spell Edited by Keen - 28 July 2014 at 8:56am |
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DennisTheMeerkat
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Joined: 04 November 2017 Location: Sweden Status: Offline Points: 3 |
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Posted: 23 September 2022 at 8:24pm |
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I know this is a old post, but I just wanted to add to the records that I have done this. I have downscaled the 1850 horns (I have the modified plans aswell if they are wanted) to 15 inch versions. I have built 2 cabinets, and got them loaded with Eminence Kappa Pro 15LFA drivers. They play surprisingly deep, and with these drivers they can play much deeper than they are specified for without any problems, aswell as handle some serious abuse. Indoors I have no problems playing them down to 30 ish hertz, and they sound great. I have 4 ordinary old bass reflex 15 inch cabinets, and the 1850 horns completely dominate in comparison to those. Outdoors, I find that they start dropping off around 40hz. But they get very loud, and sound really nice. Outdoors you don't have any use for anything below 40-50 ish hertz anyways, you won't be able to hear it or feel it really anyways. I have my crossover point around 100hz, and my high pass around 25, with a 12db/oct slope. They sound really good, so downscaling them works just fine. I had to do some slight modifications to the pressure chambers to allow fitment of these rather big drivers, but it was worth it. With these monsters in them, they perform absolutely incredible. I have never had any problems with these drivers bottoming out or running into overexcursion. very good suspension on these, makes a huge difference. There is also 18 inch versions of these drivers available, for those of you who want to build the fullsize.
  
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Matejic wrote: