Vifa P21WO-39-08 Woofer - Sealed - diyAudio
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Old 3rd September 2003, 05:20 AM   #1
sunil is offline sunil  India
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Default Vifa P21WO-39-08 Woofer - Sealed

Hi,

Has anybody used this woofer in a sealed configuration. The specs are decent, goes down to 50hz with a Qtc of 0.707 ?\

Anything in particular I should watch out for ?

Specs:

fs = 26
Qts = 0.37
Vas = 85

Vb = 32.06 (0.707)

Thanx,
sunil
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Old 3rd September 2003, 05:44 AM   #2
Ap is offline Ap
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Used to have a sub using a pair of these in isobarik, as expected it wasnt much of a sub - got down to about 60 - 70hz ?
Am now using them in pair of TLs. Much better.
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Old 3rd September 2003, 05:57 AM   #3
sunil is offline sunil  India
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Ap,

Using it in a sealed config gets down to 50hz, so I'm happy about it, but how was the output, can you play it loud ? Can it keep up with the mids/tweets.

Any distortion ?

cheers,
sunil
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Old 4th September 2003, 12:59 AM   #4
Ap is offline Ap
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It's loud enough for me.
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Old 4th September 2003, 08:32 AM   #5
Andy G is offline Andy G  Australia
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Default I don't know where....

.... you get sealed down to 50Hz from ??

BB6 models a sealed cab with an F3 around the 80Hz mark !!

The P21 is a very good bass driver, but why waste it by going sealed??
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Old 4th September 2003, 09:58 AM   #6
sunil is offline sunil  India
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Andy,

I like the sound of a sealed sub.
Also, I have a small living, which makes the 50hz seem fine.

You mention that the P21 is a good sub, does that go for the
P21WO-39-08 as well, because I know the other, P21WO-20-08
is very well reviewed by a lot of people.

I got the 50hz mark using a Qtc of 0.707. The volume works out to
32.06 litres.

What or who is "BB6" ?

Cheers,
sunil
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Old 4th September 2003, 10:10 AM   #7
Andy G is offline Andy G  Australia
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Default BB6

Bass Box Pro 6. a nice box program IMO

even the P21WO-39 in 30L models at 65Hz, Q=.57

what program are you using??
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Old 4th September 2003, 11:04 AM   #8
sunil is offline sunil  India
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Andy,

I used the formulae from the "Cookbook" & then reconfirmed it with the programs I got with "Great Sound by Weems & Koonce".

What do you think ?

Cheers,
sunil
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Old 4th September 2003, 12:53 PM   #9
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Andy and Sunil

I think you two (or your programs respectively) are not using the same set of TSPs.
If Sunil's TSPs were correct, then his results would be fine as well as I have checked them by calculation.

Regards

Charles
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Old 4th September 2003, 01:41 PM   #10
sunil is offline sunil  India
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Thanx for the input from everybody.
Can I get some info on the woofer ?
Any kind of info would be helpful.

I'm worried about ultimate power output.

It has a rated sensitivity of 88db & a power
rating of 6.3 watts.

10log 6.3=8 W
88+8=96 W

Is the 96 db on this woofer distortion free ?
Thats my worry.
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