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Center channel MTM for Logitech Z-5500.
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<blockquote data-quote="Fast1one" data-source="post: 5895485" data-attributes="member: 567387"><p>no taper:</p><p>1128ft/s = speed of sound</p><p></p><p>Lenth =8 feet</p><p></p><p>Divide by 4 (quarter wavelength)</p><p></p><p>Divide speed of sound by equivalent length, then divide by 4:</p><p></p><p>1128/8/4 = 35.25 HZ</p><p></p><p>That is not accounting for the exit or the outer boundries. Since you are going with a straight taper, I would tune above or below the FS. Don't tune at the FS because the response will be especially ragged. Then experiment with placement and stuffing. Try concentrating the stuffing near the driver or spread out. Also, keep the volume very small, cross sectional area should be near that of the tube. So make it a cube and make the dimensions roughly the diameter of the tube (obviously slightly larger for mounting).</p><p></p><p>Warning: TLs have two peaks, one at the tuning and one about an octave higher or so. This means its right around the midbass region. To fix the ragged response up top, stuffing will attenuate it. But at the cost of output. So the sub really can't be crossed over higher than around 60-80hz. Not that you should anyway...</p></blockquote><p></p>
[QUOTE="Fast1one, post: 5895485, member: 567387"] no taper: 1128ft/s = speed of sound Lenth =8 feet Divide by 4 (quarter wavelength) Divide speed of sound by equivalent length, then divide by 4: 1128/8/4 = 35.25 HZ That is not accounting for the exit or the outer boundries. Since you are going with a straight taper, I would tune above or below the FS. Don't tune at the FS because the response will be especially ragged. Then experiment with placement and stuffing. Try concentrating the stuffing near the driver or spread out. Also, keep the volume very small, cross sectional area should be near that of the tube. So make it a cube and make the dimensions roughly the diameter of the tube (obviously slightly larger for mounting). Warning: TLs have two peaks, one at the tuning and one about an octave higher or so. This means its right around the midbass region. To fix the ragged response up top, stuffing will attenuate it. But at the cost of output. So the sub really can't be crossed over higher than around 60-80hz. Not that you should anyway... [/QUOTE]
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Center channel MTM for Logitech Z-5500.
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