Quasi-6th order pyle 21" - diyAudio
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Old 31st December 2009, 09:03 PM   #1
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Cool Quasi-6th order pyle 21"

And let the fun *and drywall patching* begain.
Today the fedex guy dropped off my new Pyle PDW21250 and I must say it is way past my expectations as far as build quality, I have seen Eminence speakers at twice the cost that do not look/feel as sturdy.
This thing is MASSIVE! I am 6 foot, *182.8cm* the cone is about 5" *127mm* deep the cone looks to move about 5-6mm each way so with it being proaudio i would think its in the 3-4mm each way linear and the hump on the pole cap is about the size of a CD.
T/S as per Magnetar's post thats an average of 4
FS - 31.61 RE - 5.59
RES- 59.81 QMS- 4.03
QES- 0.38 QTS- 0.34
L1- 1.88 VAS - 274.29 liters
SPL - 95.4
Did some quick math and ended up with a quasi-6th order bandpass as the best option for what im looking for.
spec's for the planned box:
b1 = *rear* b2 = *front*
Vb1 6cu.ft
Fb1 14Hz
Port
Vb2 2cu.ft
Fb 1 28Hz
The math gives it an F3 of 8.4 /104.9hz but with the port being at 14Hz i will be giving it an active bandpass filter of 14Hz@6th order/ ~60hz 3rd order. I will keep you all up to date on any updates, may take a bit before i start on this but any questions or feed back are more than welcome.
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Old 1st January 2010, 02:46 PM   #2
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Could you post some simmed response charts - it sounds to me like you're going to have excursion problems with frequencies so low. After all, it's resonance is mid 30s. I'd say it's designed for a one-box subs for clubs etc, rather than using several 12"s or 15"s

Edit - moving that much air would be fun in a dipole situation.
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Old 2nd January 2010, 10:19 PM   #3
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Quote:
Originally Posted by chris661 View Post
Edit - moving that much air would be fun in a dipole situation.
agreed, and i am in need of a new coffee table but the size and layout of the room may make it hard to implement.

resp-sim in attachments keep in mind this is a Quasi-6th where one volume is vented to the other and that one is vented to air, so there is some control over the cone till 14Hz.
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Old 2nd January 2010, 11:05 PM   #4
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Hi killerfishes,

Are you able to measure the T/S parameters of your Pyle 21"? The web info seems to imply that several different T/S versions were produced over the years by Pyle. Accurate T/S parameters for the actual woofer are necessary for good 6th order tuning.
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Old 2nd January 2010, 11:54 PM   #5
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not in any high tech fashion, just the good old 1k Ohm resistor method. I will do this soon.
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Old 3rd January 2010, 12:16 AM   #6
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BANG
FOR
THE
BUCK.

The only 21" I could ever afford!
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Old 3rd January 2010, 12:31 AM   #7
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lol, Inclined love youre sig. I have a V8 Rx7
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Old 3rd January 2010, 01:08 AM   #8
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Ah! I would have put one in my Fiero if I had dared, but I know myself well enough to predict I'd fold it around a tree.
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Old 4th January 2010, 02:36 AM   #9
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I have now been giving it 1W rms of white noise for 6hrs, 2W for 6hrs, 10W for 12 and I now have it set at 30w of music for 24hrs, so I should have TS by mid week. At 10W with no cabbnet i had to move it to the basement as it was to loud to keep ignoring, at 2W it was quite nice helped me sleep. Kinda like the sound of the inside of a 737. So far im betting its going to be close to 90Db @ 2.83v.
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Old 4th January 2010, 07:02 AM   #10
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Been wondering about this driver.
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