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Advice on new 15" Horn
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corell View Drop Down
Young Croc
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    Posted: 09 April 2014 at 3:43pm
I wanted to design a basshorn doing 40Hz in a stack of 4 but also be usefull in singles or double stacks (lacking the "dip" in response).
The driver i choose is the 18sound 15LW2400.
Due to beeing a 15" i guess it will play quite high up and be fast and punchy.
Its rated at 1200w and has 10mm xmax. I see no disadvantage compared to a 18" in a horn.

Anyway, here is what i came up with:
90x 50x 90 cm (405l), so way smaller than WSX etc...



The driver is reverse loaded to minimize power compression losses. It can handle the full 1200 w RMS till xmax is reached.
also, it has a lot of 90° and 45° angles, which should make it easier for DIY.

Plot in 2 and 0,5 pi :



its not "flat" in 2pi, but with the right Low pass filter, its 103db/w/m 43-150Hz -3db.
surely, if you only ever use single bass bins, you wont go for a horn, so see it as a compromise (as allways...).

edit: it can be made totally flat in singles by making it 10cm higher and 5cm deeper and leave the rest as it is. (475l)


Please share your thoughts!

If anyone is interested in confirming my simulations, please write me and i will send you the sketchup file ;)

Will post all the dimensions to build it for private usage after im sure it works the way it should!




Edited by corell - 09 April 2014 at 5:52pm
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Timebomb View Drop Down
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Points: 2716 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Timebomb Quote  Post ReplyReply Direct Link To This Post Posted: 09 April 2014 at 4:31pm
Looks good, i like the layout,  it seems there a big step in expansion at the 180 degree bend though?  Or is that just me?
James Secker          facebook.com/soundgearuk
James@soundgear.co.uk               www.soundgear.co.uk
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corell View Drop Down
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Points: 1161 		Post Options Post Options   Thanks (0) Thanks(0)   Quote corell Quote  Post ReplyReply Direct Link To This Post Posted: 09 April 2014 at 4:42pm
it is and thats the whole point to get the respons smooth in singles ;)
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Like it, been working on a dual 15" folded horn myself. Not as good with the technical stuff like you though.
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snowflake View Drop Down
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without seeing the sim inputs it's hard to say for sure but I'm a bit suspect of your 'flat' response. it does look like there is no dip but I suspect this is because it isn't reactance annulled so there is no peak at 45Hz. 102dB 1w/1m @ 60Hz is ok but nothing special.

what happens if you move the back panel in 10cm? does sensitivity and excursion at 60Hz get worse or does it just make response at 45Hz better?


Edited by snowflake - 23 April 2014 at 7:12pm
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corell View Drop Down
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Points: 1161 		Post Options Post Options   Thanks (0) Thanks(0)   Quote corell Quote  Post ReplyReply Direct Link To This Post Posted: 09 April 2014 at 6:34pm
Originally posted by snowflake snowflake wrote:

without seeing the sim inputs it's hard to say for sure but I'm a bit suspect of your 'flat' response. it doesn't look like there is no dip but I suspect this is because it isn't reactance annulled so there is no peak at 45Hz. +- 0,2db difference if masked

102dB 1w/1m @ 60Hz is ok but nothing special.  i know, for me there is nothing special in bass cabs at all ;) its all about finding the best compromise in size/low end/ SPL/ size of stack...

what happens if you move the back panel in 10cm? does sensitivity and excursion at 60Hz get worse or does it just make response at 45Hz better?  it "adds" a little between 45 and 70hz, so 103db flat ;)


thanks for the input !


Edited by corell - 09 April 2014 at 6:34pm
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Mark James View Drop Down
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Points: 5309 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Mark James Quote  Post ReplyReply Direct Link To This Post Posted: 09 April 2014 at 6:39pm
interesting design :-] should think stack of four/six will do some damage :-]
me so horny me love you long throw
horn loaded for her pleasure
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Keen View Drop Down
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Points: 1203 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Keen Quote  Post ReplyReply Direct Link To This Post Posted: 10 April 2014 at 2:45am
corell, please pass on that sketchup file if you'd like some feedback on sims.

younghealthandfitness at gmail dot com

Cheers,
Simon
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DanielIt View Drop Down
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Points: 273 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DanielIt Quote  Post ReplyReply Direct Link To This Post Posted: 10 April 2014 at 6:12am
I  would like to sim your cab with another 15" driver that i have laying arround.Could you pass the info on bassmnc80 at yahoo.com.
Thank you,
Daniel
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all bass View Drop Down
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Points: 1855 		Post Options Post Options   Thanks (0) Thanks(0)   Quote all bass Quote  Post ReplyReply Direct Link To This Post Posted: 22 April 2014 at 7:57pm
Any new developments in this project? 
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corell View Drop Down
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Points: 1161 		Post Options Post Options   Thanks (0) Thanks(0)   Quote corell Quote  Post ReplyReply Direct Link To This Post Posted: 23 April 2014 at 12:41am
Im afraid im Not able to build a proto in the Moment,sorry.
Simon confirmed my simulations but i would still be happy to get some feedback about the reverse loading etc.

Rcf 15x401 also looks really promising in this one

Edited by corell - 23 April 2014 at 12:43am
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Points: 292 		Post Options Post Options   Thanks (0) Thanks(0)   Quote T-Bone Quote  Post ReplyReply Direct Link To This Post Posted: 23 April 2014 at 4:48am
Nice design corell I would like to build some but I am looking to build an 18" version that would go a little lower and beat the pants of the WSX or even a Startec type folded 18". Can you maybe make it a little taller and a little longer to fit a cheap Eminence 18" woofer like Omega or a Faital 18" neo to make it lighter cab? Looks good though I'd like to build some in 15 mm but in 18" version? Thanks!
BASS, how low can you go!
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