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.
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.
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.
0.56 is not an unusual value for Qts either.
To make Qts lower, as I stated before, make the magnet larger.
kelticwizard said:
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
sonu said:
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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