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15'' 1850s plans?

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Matejic View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Matejic Quote  Post ReplyReply Direct Link To This Post Posted: 18 March 2011 at 6:02pm

I want to built swesound cab and is it better to use RCF MB15N401 or PD1550 driver?

tnx anyway
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biotec View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote biotec Quote  Post ReplyReply Direct Link To This Post Posted: 18 March 2011 at 6:06pm
Originally posted by Matejic Matejic wrote:

I want to built swesound cab and is it better to use RCF MB15N401 or PD1550 driver?

tnx anyway
 
The 1550 without a doubt.
 
Th mb15n401 is not a proper bass driver.
me so horny, me love you long throw.
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LjudLahger View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote LjudLahger Quote  Post ReplyReply Direct Link To This Post Posted: 08 July 2011 at 6:16pm
Originally posted by Matejic Matejic wrote:

I want to built swesound cab and is it better to use RCF MB15N401 or PD1550 driver?

tnx anyway

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 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote smoore Quote  Post ReplyReply Direct Link To This Post Posted: 21 July 2011 at 5:39pm
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 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote LjudLahger Quote  Post ReplyReply Direct Link To This Post Posted: 13 May 2013 at 11:19pm
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 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote JR.junior Quote  Post ReplyReply Direct Link To This Post Posted: 14 May 2013 at 7:06am
build scoop, much more output power.
Support the scoop technology, larger mouth plays louder!
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ovidias View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ovidias Quote  Post ReplyReply Direct Link To This Post Posted: 28 July 2014 at 7:33am
can anyone post input data for Horn resp?
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Keen View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Keen Quote  Post ReplyReply Direct Link To This Post Posted: 28 July 2014 at 8:28am
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 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote LjudLahger Quote  Post ReplyReply Direct Link To This Post Posted: 28 July 2014 at 8:38am
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 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Keen Quote  Post ReplyReply Direct Link To This Post Posted: 28 July 2014 at 8:54am
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 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DennisTheMeerkat Quote  Post ReplyReply Direct Link To This Post Posted: 23 September 2022 at 8:24pm
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. Big smileWinkSmile
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