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Subwoofer Design like Fan without Sound
Subwoofer Design like Fan without Sound
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Old 5th December 2017, 11:45 AM   #11
scottjoplin is offline scottjoplin  Wales
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Good idea, and you could put it on the ceiling out of the way, why has nobody thought of this before?
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Old 5th December 2017, 11:45 AM   #12
Kay Pirinha is offline Kay Pirinha  Germany
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Quote:
Originally Posted by scottjoplin View Post
...like a 2 stroke engine, one piston and two valves ducted so they vent 180 degrees apart

Erm, a two stroke engine in it's original layout doesn't feature any valves at all?!?


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Old 5th December 2017, 11:46 AM   #13
scottjoplin is offline scottjoplin  Wales
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Reed valves
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Old 5th December 2017, 11:57 AM   #14
Kay Pirinha is offline Kay Pirinha  Germany
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Yes, but this means a more advanced construction over the original Nikolaus Otto idea.


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Old 5th December 2017, 11:58 AM   #15
scottjoplin is offline scottjoplin  Wales
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But he want's a high performance fan
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Old 5th December 2017, 12:27 PM   #16
Kay Pirinha is offline Kay Pirinha  Germany
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...and has a really elaborate, sophisticated idea to achieve this, har har.


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Old 5th December 2017, 12:37 PM   #17
Xoc1 is offline Xoc1  United Kingdom
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This is a very silly idea. If you want a low noise fan then buy a low noise fan!
But as a mad DIY project I like the concept.
Using both sides of the speaker in separate chambers makes sense and the reed valves should work.
But the valves will introduce physical noise and harmonics to the output flow so there will not be a clean 30hz.
Also sensitivity has little to do with SPL - Displacement of air has.

50 or 60 hz will be cheaper - just use a mains transformer.
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Old 5th December 2017, 02:48 PM   #18
TNT is offline TNT  Sweden
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Rotary Subwoofer - Worlds Lowest Freq Subwoofer - YouTube

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Old 5th December 2017, 03:11 PM   #19
bjorno is offline bjorno  Sweden
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Hi All,

FYI: A weird attempt? Check my Calculations:

b
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Old 5th December 2017, 03:37 PM   #20
bjorno is offline bjorno  Sweden
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Hi again.. Forgot to divide xmax with sqrt(2)..This makes the Maximum Volume Flow to ~ 75 m^3/h

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