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<blockquote data-quote="Art Welter" data-source="post: 218749" data-attributes="member: 52">The &quot;box&quot; itself will have resonant modes &quot;room modes&quot; .The inlets and outlets make the box a Helmholtz resonator.The inlets and outlets have pipe resonances.A &quot;high Q&quot; is a narrow frequency band, say 1/6 octave, a Q of 8.7, a 1/3 octave is 4.3, one octave 1.141.[ATTACH=full]209923[/ATTACH][URL unfurl=&quot;true&quot;]https://sengpielaudio.com/calculator-bandwidth.htm[/URL]Rectangular works fine for low frequencies and makes construction easy.That said, Sonotubes (concrete forms) are cylindrical and relatively cheap.Yes, since you want to absorb the Helmholtz resonance.The dampening material will change the virtual box volume.[URL unfurl=&quot;true&quot;]https://www.omnicalculator.com/physics/helmholtz-resonator[/URL][ATTACH=full]209924[/ATTACH]You might fit bass traps with adjustable &quot;ports&quot; in each room corner.</blockquote>

[QUOTE="Art Welter, post: 218749, member: 52"] The "box" itself will have resonant modes "room modes" . The inlets and outlets make the box a Helmholtz resonator. The inlets and outlets have pipe resonances. A "high Q" is a narrow frequency band, say 1/6 octave, a Q of 8.7, a 1/3 octave is 4.3, one octave 1.141. [ATTACH type="full" size="390x343"]209923[/ATTACH] [URL unfurl="true"]https://sengpielaudio.com/calculator-bandwidth.htm[/URL] Rectangular works fine for low frequencies and makes construction easy. That said, Sonotubes (concrete forms) are cylindrical and relatively cheap. Yes, since you want to absorb the Helmholtz resonance. The dampening material will change the virtual box volume. [URL unfurl="true"]https://www.omnicalculator.com/physics/helmholtz-resonator[/URL] [ATTACH type="full" size="898x700"]209924[/ATTACH] You might fit bass traps with adjustable "ports" in each room corner. [/QUOTE]

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