Free Plan: 21" 30hz Ported Sub
Printed From: Speakerplans.com
Category: Plans
Forum Name: New Projects Forum
Forum Description: Forum for new speakerplans projects, in memory of Tony Wilkes, 1953 - 2014
URL: https://forum.speakerplans.com/forum_posts.asp?TID=101606
Printed Date: 26 March 2026 at 5:36pm
Software Version: Web Wiz Forums 12.08 - https://www.webwizforums.com
Topic: Free Plan: 21" 30hz Ported Sub
Posted By: vertx
Subject: Free Plan: 21" 30hz Ported Sub
Date Posted: 03 April 2018 at 12:03am
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I imagine this would do well under a good 15", crossover in the 60hz region. ** Everything below is theoretical and has not been built and measured yet ** Driver: Eighteensound 21LW2500 Enclosure Volume: 267.2 L Cabinet Tuning Freq: 31hz Fusion 360 Public Share Link: https://a360.co/2Ik9Ffe" rel="nofollow - https://a360.co/2Ik9Ffe ^^ This will let you view in 3D, explode, measure, etc all in a web browser window! Cabinet Processing:
 SPL @ 2500w:  xmax @ 2500w:  Port Velocity @ 2500w:  Port Area:     ------------- www.instagram.com/translate.sound |
Replies:
Posted By: sgarfa
Date Posted: 24 May 2018 at 2:21pm
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nice project, but especially on so performing woofers i I prefer to use to big vent ports.. ... even at cost to tuning bit higher... there are 1x21 "reflex pro subs with over 700cm2 of mouth (not diy) ------------- http://www.soundcloud.com/ramirez_amd" rel="nofollow - Ramirez_amd TECHNO |
Posted By: PHATpedro
Date Posted: 10 May 2025 at 7:54pm
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Do you have any plans available? I am desperately looking for a single 21" reflex cabinet i can use with my 21LW1400 driver. But so far without succes I am specifically looking for a reflex. No bandpass or horn. Kind regards from mexico |
Posted By: MarjanM
Date Posted: 10 May 2025 at 10:53pm
That is easy, design your own one. ------------- Marjan Milosevic MM-Acoustics www.mm-acoustics.com https://www.facebook.com/pages/MM-Acoustics/608901282527713 |
PHATpedro wrote:Posted By: PHATpedro
Date Posted: 11 May 2025 at 9:50pm
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I would if I knew what to do and how to calculate and all that stuff. I am a productdesigner who does carpentry now on a small scale, so tools I might have. Knowledge not so much. Great wood - nope. Waterproof Marina Plywood or MDF is my best bet here. Also I know this exists, but i do not know how to upscale it for a 21" driver. https://eighteen.it/media/W1siZiIsIjIwMjMvMDcvMTcvMTRfMDVfNTlfMzA3XzE4U3ViX3YxXzEucGRmIl1d - https://eighteensound.it/media/W1siZiIsIjIwMjMvMDcvMTcvMTRfMDVfNTlfMzA3XzE4U3ViX3YxXzEucGRmIl1d Driver: 18Sound 21LW1400 Freq Range: 24-2000hz Res Freq: 28Hz VCdiam: 4" Xmax: 9,5mm Rec Tuning: 30Hz Rec Volume: 300L Alternatively i could get this driver here: RCF LF21X451 The only two 21" drivers available for me here. The RCF is more expensive. The 18sound will cost me roughly 650Usd per driver. |
Posted By: MarjanM
Date Posted: 11 May 2025 at 10:32pm
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The RCF is much much better driver. ------------- Marjan Milosevic MM-Acoustics www.mm-acoustics.com https://www.facebook.com/pages/MM-Acoustics/608901282527713 |
Posted By: PHATpedro
Date Posted: 15 May 2025 at 11:17pm
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Thank you. It will be the RCF then. Trial and error and hopefully not lose all the money I hardly have. I made a design but I somehow cannot figure out how to put the pictures in here. roughly 340l triangular ports 2x base/height 25cm 45degree, 488m long (28hz) one u shaped brace in the middle horizontally (or is it better vertically?) Can anybody help me to move forward? I would love to have it built before rainseason arrives and you can watch every sheet material warp live. |