Hey guys,
Working on replacing / upgrading the midrange drivers in my Cerwin Vega D9's. The AC120/50CK's fit perfectly in the cabinet and have a decent frequency range as a mid. The issue is they are not sealed backs. I think I have a plan to create enclosures inside the cabinet, but I want to make sure I am not missing the boat.
I have some 5" diameter cardboard tubes (heavy duty). I believe I can cut these to the right length to get the right volume, cap the ends, and then glue them to the inside of the cabinet, thus creating my sealed mids. What I am unsure of is exactly what length to make these tubes.
Vas = 0.42 ft(3) fs = 43 Qts = 0.18 If using a Qtc of 0.707, it seems the volume needs to be 0.03 ft(3) or 51.84 in(3). for a f3 and fb of ~168 Hz
I assume the displacement of the driver would be around 40 in(3), do I need to add this to the tube volume for a total of 90 in(3) ?
If I am calculating this right, tube length will be around 4.625".
The crossover point between the woofer and mid is ~ 333.
Am I on the right track?
Joe
Working on replacing / upgrading the midrange drivers in my Cerwin Vega D9's. The AC120/50CK's fit perfectly in the cabinet and have a decent frequency range as a mid. The issue is they are not sealed backs. I think I have a plan to create enclosures inside the cabinet, but I want to make sure I am not missing the boat.
I have some 5" diameter cardboard tubes (heavy duty). I believe I can cut these to the right length to get the right volume, cap the ends, and then glue them to the inside of the cabinet, thus creating my sealed mids. What I am unsure of is exactly what length to make these tubes.
Vas = 0.42 ft(3) fs = 43 Qts = 0.18 If using a Qtc of 0.707, it seems the volume needs to be 0.03 ft(3) or 51.84 in(3). for a f3 and fb of ~168 Hz
I assume the displacement of the driver would be around 40 in(3), do I need to add this to the tube volume for a total of 90 in(3) ?
If I am calculating this right, tube length will be around 4.625".
The crossover point between the woofer and mid is ~ 333.
Am I on the right track?
Joe
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