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WinISD & vent volume.
WinISD & vent volume.
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Old 31st January 2013, 11:06 AM   #1
SpirosZ is offline SpirosZ  Greece
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Default WinISD & vent volume.

I am simulating my Peerless XLS10 830452 in WinISD and I get a recommendation for really small enclosures.
I decided to ignore the default recommendation of a 4.9lt enclosure tuned at 45Hz or something and I am simulating a box at approximately 17lt tuned at around 28Hz.
I plan to use a slot vent of 3cm height and 22cm width (to match the box depth) and I get a 1.3 meters long port (approximately).
Am I correct assuming that the vent volume is not included in the calculations? that means that I may build a 17lt box (internal volume) as long as the port will be external right?
If this is the case, I have already designed a box that the vent starts from one corner of the box and circles around it on all sides.
I end up with a box approximately 40X44X27 outer dimensions with the 17lt chamber in the middle and the slot vent (that has a net volume of an additional 6.6lt) around it.
Is that correct?
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Old 31st January 2013, 11:17 AM   #2
Aucosticraft is offline Aucosticraft  India
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Can you put the TS of the drivers pls.

Mostly All tools would want you to add the Port volume to the required volume of box. you also have to add volume that driver occupied.
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Last edited by Aucosticraft; 31st January 2013 at 11:22 AM.
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Old 31st January 2013, 11:56 AM   #3
SpirosZ is offline SpirosZ  Greece
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T/S parameters for Peerless 830452

Znom 8 ohm
Re 3.4 ohm
Le 4.3 mH
fs 18.6 Hz
Qms 2.66
Qes 0.18
Qts 0.17
Mms 139.3 g
Cms 0.52 mm/N
Sd 333 cm2
BL 17.5 N/A
Vas 80.2 ltrs
Xmax 12.5 mm peak
Voice Coil 51 mm
Sensitivity
2.83V / 1m 88.4 dB
Power (IEC) 200 W
Magnet weight 2.42 kg
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Old 31st January 2013, 12:08 PM   #4
AndrewT is offline AndrewT  Scotland
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I think there is something wrong with the T/S data.
VAS=80l and Fs=18.6Hz seems incompatible with 139gm for mms.
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Old 31st January 2013, 12:41 PM   #5
SpirosZ is offline SpirosZ  Greece
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Most recommendations I've seen for this sub are for 17 or 20lt sealed or with a PR tuned around 22Hz.
Long port length is the reason for the PR recommendation but I am willing to take that route and save 120euros/speaker.
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Old 1st February 2013, 12:46 AM   #6
Mikey p is offline Mikey p  Canada
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Quote:
Originally Posted by AndrewT View Post
I think there is something wrong with the T/S data.
VAS=80l and Fs=18.6Hz seems incompatible with 139gm for mms.
You are mistaken, the parameters are correct.
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Old 1st February 2013, 01:21 AM   #7
sreten is offline sreten  United Kingdom
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Quote:
Originally Posted by AndrewT View Post
I think there is something wrong with the T/S data.
VAS=80L and Fs=18.6Hz seems incompatible with 139gm for mms.

Hi,

Those three numbers imply a particular Sd, not incompability. Fs
and Mms imply a stiffness, to convert that to Vas you need the Sd.

rgds, sreten.
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Old 1st February 2013, 04:17 AM   #8
Inductor is offline Inductor  Portugal
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Posting link for driver T/S parameters PEERLESS 830452 (v.?) SUBWOOFER 10" XTRA-LONG-STROKE 8 ohm here
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Old 1st February 2013, 07:36 AM   #9
SpirosZ is offline SpirosZ  Greece
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Quote:
Originally Posted by Inductor View Post
Posting link for driver T/S parameters PEERLESS 830452 (v.?) SUBWOOFER 10" XTRA-LONG-STROKE 8 ohm here
Thanks, that was very helpful.
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Old 1st February 2013, 07:50 AM   #10
SpirosZ is offline SpirosZ  Greece
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Can someone tell me how I figure out speaker displacement? (I hope I am saying this right, I mean the volume the driver takes that I will have to add to the total box volume). Is should be a measurement in liters or cu.ft.
Is it one of the parameters listed? There some of those that I do not understand.
Or should I just add a liter or two and be done with it?
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