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Single 21" reflex plans?

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bee View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bee Quote  Post ReplyReply Direct Link To This Post Posted: 14 February 2017 at 10:02pm
18 sound 21"...
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Post Options Post Options   Thanks (0) Thanks(0)   Quote audiomik Quote  Post ReplyReply Direct Link To This Post Posted: 21 February 2017 at 8:56am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote cravings Quote  Post ReplyReply Direct Link To This Post Posted: 21 February 2017 at 10:09am
best wishes mik.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote T-Ed Quote  Post ReplyReply Direct Link To This Post Posted: 21 April 2018 at 6:51pm
I need something similar, Look good.
Idealy id like to buy these but need a cheaper build option

https://www.google.com/search?q=RCF+SUB+8005-AS&client=firefox-b&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjbg-j478vaAhWHDSwKHXT8CngQ_AUICigB&biw=1440&bih=803#imgrc=I86dfO-8vGTsaM:
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Post Options Post Options   Thanks (0) Thanks(0)   Quote vertx Quote  Post ReplyReply Direct Link To This Post Posted: 22 April 2018 at 3:32am
I was playing around with a 21" ported design a few weeks back that might suit? Should be pretty easy to sim some alternative drivers in the enclosure.

https://forum.speakerplans.com/topic101606.html
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Post Options Post Options   Thanks (0) Thanks(0)   Quote sgarfa Quote  Post ReplyReply Direct Link To This Post Posted: 27 April 2018 at 9:43am
hello .. I take the opportunity ... years ago I had built a prototype.. just to try .. in mdf Confused... I was very satisfied .... 30-60hz (I should also have the smaart track), to be used under the tms4, the woofer was  rcf lf21n451....
sorry for the photo but i don't find the original....then i cut a collage from my instagram




Edited by sgarfa - 27 April 2018 at 10:26am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dub Specialist Sound Quote  Post ReplyReply Direct Link To This Post Posted: 27 April 2018 at 2:28pm
AQnyone know if any good

for 2150?

need to do some testing in boxs for thr pd
Musical Roots Reggae Vibration is Life! for music is sound...sound is vibration...vibration is energy... and energy begets life. Therein lies my passion!...MUSIC IS LIFE...
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Father-Francis Quote  Post ReplyReply Direct Link To This Post Posted: 27 April 2018 at 2:40pm
Originally posted by Dub Specialist Sound Dub Specialist Sound wrote:

AQnyone know if any good

for 2150?

need to do some testing in boxs for thr pd
It will work good with  both 2150&neo boss down to around 32hz 


Edited by Father-Francis - 27 April 2018 at 2:41pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote T-Ed Quote  Post ReplyReply Direct Link To This Post Posted: 01 May 2018 at 7:37am
Thanks for Replys, Looks good. Im looking for slightly smaller width, no more than 600. may have to try find a second hand one to have a look at.

Im after the ported reflex design specifically. same as this

https://www.google.com/search?q=RCF+SUB+8005-AS&client=firefox-b&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjbg-j478vaAhWHDSwKHXT8CngQ_AUICigB&biw=1440&bih=803#imgrc=I86dfO-8vGTsaM:

I need to find the exact same design.

the outside dimensions are
  • Height: 825 / 32.48 mm/inch 
  • Width: 600 / 23.62 mm/inch 
  • Depth: 805 / 31.69 mm/inch
cheers


Edited by T-Ed - 01 May 2018 at 5:23pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DMorison Quote  Post ReplyReply Direct Link To This Post Posted: 01 May 2018 at 7:19pm
Originally posted by T-Ed T-Ed wrote:

Thanks for Replys, Looks good. Im looking for slightly smaller width, no more than 600. may have to try find a second hand one to have a look at.

Im after the ported reflex design specifically. same as this


I need to find the exact same design.

the outside dimensions are
  • Height: 825 / 32.48 mm/inch 
  • Width: 600 / 23.62 mm/inch 
  • Depth: 805 / 31.69 mm/inch
cheers

Well, looks like it's time to download WinISD or similar, calculate a realistic internal volume to go with those external dimensions and model something yourself then.
Remember any modelling is based on the net internal volume of a box after accounting for the driver, bracing, ports, handles etc.
Remember also that a shelf port will tune lower than predicted by WinISD, so some prototyping is likely to be required. (This is because the maths used by WinISD to calculate port length assumes the internal end is well away from the side walls of the cabinet - the opposite of what happens with a shelf port.)

Good Luck,
David.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote T-Ed Quote  Post ReplyReply Direct Link To This Post Posted: 07 May 2018 at 3:20pm
Ok, Thanks for the advise.
Is there any software you can recommend that will take into account the shelf port? so i can design accuratley from the start, i dont mind spending some money.
Im going to use rcf LF21X451 drivers.
Cheers
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DMorison Quote  Post ReplyReply Direct Link To This Post Posted: 08 May 2018 at 2:19pm
Originally posted by T-Ed T-Ed wrote:

Ok, Thanks for the advise.
Is there any software you can recommend that will take into account the shelf port? so i can design accuratley from the start, i dont mind spending some money.
Im going to use rcf LF21X451 drivers.
Cheers

I don't know of any software that accounts for the length change in shelf ports, but I have seen a formula for calculating the new port length yourself.

It is:

Lv = 10 * c^2 / (16*pi) * D^2 * Np / (fb^2*Vb)-k*D

Where
c = 344m/s
D=diameter of vent in cm
Np=no. of vents
k = correction

K values suggested are:

0.732 for a vent that is in the middle of the baffles ie away from any sides.
1.23 for a vent that is against one side wall only
1.728 for a corner vent
2.227 for a shelf vent that is against three internal walls of the cabinet.

Here's the original image I got that from , it's been around several other audio fora for a decade or more but I don't know the original source.
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