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Old 07-27-2010, 07:20 PM   #1
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Default Qtc?

I want to build a sealed box for my subs just to see if i like it better than a ported. In my owners manual it gives me the measurements for a the optimum sealed box which would be two cubic feet per sub. It says at that volume it would have a QTC of 0.45, could anyone shed some light on what that means?
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Old 07-27-2010, 08:16 PM   #2
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"Qtc - value for the damping provided for a driver in a sealed enclosure. Denotes the enclosures ability to control the driver response at resonance. Qtc = 0.707 is the optimum value for sealed enclosures, providing flattest response and highest SPL for deep bass extension. Enclosures for this value are often rather large. Lower Qtc can give even better transient response, down to a Qtc of 0.577 for the best damping and transients, but the enclosure is usually huge and SPL'* are down. A Qtc of 1.0 is a compromise between deep bass and transient response vs. smaller sized enclosure. Larger subs can go with an even higher Qtc, as their resonant frequency is often very low, but Qtc'* above 1.5 can begin to sound very muddled and boomy, and sacrifice deep bass extension and transient response for enhanced mid-bass peaks (louder)."

http://diyaudiocorner.tripod.com/def.htm
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Old 07-28-2010, 06:00 AM   #3
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so how would my subs sound with a qtc of 0.45?
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Old 07-28-2010, 11:35 AM   #4
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I believe with a QTC of .45 it would be considered an SQL system and be a nice quick tight bass.
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Old 07-28-2010, 05:37 PM   #5
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nice thats what im lookin for.
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