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Old 17th December 2006, 12:00 AM   #1
Supa is offline Supa  United States
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Default Building my own speakers

Hey guys,

I'm fairly new to building my own speakers, so i was just after a little help regarding the cabinet dimensions for the type of speakers i have.

I purchased 2 Vifa P17WJ-00-08 woofers

http://www.speakerbits.com/net/catal...aspx?ID=VF170B

And 2 Vifa D27TG-45-06 tweeters

http://www.speakerbits.com/net/catal...aspx?ID=VF027C

I also have 50mm ports.

Obviously im making 2-ways, but after a little research, I found my original dimensions for the box of 440x205x295mm may not me correct.

Can anyone help me regarding the correct dimensions for these specific speakers?

Cheers.
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Old 17th December 2006, 01:01 AM   #2
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Location: Victoria, B.C.
Quote:
Obviously im making 2-ways, but after a little research, I found my original dimensions for the box of 440x205x295mm may not me correct.
That's about a 26.6 litre enclosure tuned to 43Hz, flat fr to about 55Hz according to my calcs and WinISD. Looks fine, although the port dia. might be a bit small for that box.

You could download WinISD and play around with the tuning/box dims etc. The P17WJ is in the driver database.

Jeff
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Old 17th December 2006, 10:32 AM   #3
Supa is offline Supa  United States
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Thanks for the reply Jeff.

According to WinISD, it says I need a volume of 21.7 liters and a tuning frequency of 42.79Hz. It then gives me dimensions of 485x314x202mm (Height, Width, Depth), but that equals a volume of 30.7 liters.

How is that so? Am i missing anything?

If I stuck with the original box dimensions, would there be any change in sound compared to those given by WinISD?

Cheers
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Old 17th December 2006, 11:23 AM   #4
Tenson is offline Tenson  United Kingdom
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I always just use WinISD to tell me the volume I need then calculate the size from that myself. Seems to work, but remember the volume of the port is additional to the enclosure volume you tap in to WinISD.
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Old 17th December 2006, 09:46 PM   #5
Supa is offline Supa  United States
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I would like to start today, so would my original dimensions suffice?
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Old 17th December 2006, 10:13 PM   #6
CarlosT is offline CarlosT  United States
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Interesting...a super low SBB4 alignment gives a box 19 liters in volume with a 19 cm length port (50mm diameter). Optimum Golden Ratio box would be 43 cm x 27 cm x 17 cm.
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Old 17th December 2006, 10:16 PM   #7
CarlosT is offline CarlosT  United States
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Those numbers checked out on both AJDesigner and diysubwoofer.org spreadsheets...both free programs.

http://www.diysubwoofers.org/prt/ported.zip

http://www.ajdesigner.com/downloads/ajvented.exe
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