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Multi-Way Conventional loudspeakers with crossovers

sealed vs. ported
sealed vs. ported
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Old 8th May 2005, 04:02 PM   #21
sonu is offline sonu  India
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I rechecked the thiele paras, given by elliott sound and i got the following results results,
FS - 29.6
VAS - 284
Qes - 0.61
Qms - 7.46
Qts - 0.56

But before testing, I had a break in for the driver.

Second thing, is the Qts high because i have used a 8mm thick top plate and the coil is 35mm lenth, which gives me 13mm of linear xmax, and only 8mm is in the magnetic gap.
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Old 8th May 2005, 05:08 PM   #22
sonu is offline sonu  India
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Somebody please reply,
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Old 9th May 2005, 03:52 AM   #23
kelticwizard is offline kelticwizard  United States
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sealed vs. ported
I don't know that much about speaker topology, but I do know that 8 mm is a very common value for the magnetic gap, (air gap). That is not unusual at all.

0.56 is not an unusual value for Qts either.

To make Qts lower, as I stated before, make the magnet larger.
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Old 9th May 2005, 04:34 AM   #24
richwalters is offline richwalters
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Quote:
Originally posted by kelticwizard


0.56 is not an unusual value for Qts either.

Break point for reflex tuning is drive unit Qts lower than 0.4......above that go for sealed box.
However nothing is imposs. You can use a highish Qts speaker and put it in a large box and keep system Q around 1.......depends on your usage.

You can put a high Qts drive unit in a small box with alot of damping.........not recommended unless for MI apps.

Your VAS suggests a large box..however do the math first.

richj
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Old 9th May 2005, 12:19 PM   #25
kelticwizard is offline kelticwizard  United States
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sealed vs. ported
Quote:
Originally posted by sonu
I rechecked the thiele paras, given by elliott sound and i got the following results results,
FS - 29.6
VAS - 284
Qes - 0.61
Qms - 7.46
Qts - 0.56

YOU said that you test these in a 2.8 cu ft = 80 liters sealed box, and that it sounds good.

Not surprised.

Put a woofer with these numbers into a sealed 80 liter box, and yu get a Qtc = 1.19.

The range you normally aim for is Qtc = 0.5 to 1.0.

The number of this woofer/box combination, Qtc = 1.19, is only a little bit higher than that, so it still should sound pretty decent.

A sealed box woofer with a Qtc = 1.19 will still have better step response than most vented boxes. And many people, such as myself, like vented boxes.
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Old 9th May 2005, 12:50 PM   #26
sonu is offline sonu  India
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Thanks who all replied, for keeping the DIY's spirit up.

Support for the new thread started by me "DIY Loudspeaker construction"
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