Building my own speakers

Supa · 17th December 2006, 01:00 AM

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.

vinylkid58 · 17th December 2006, 02:01 AM

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

Supa · 17th December 2006, 11:32 AM

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

Tenson · 17th December 2006, 12:23 PM

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.

Supa · 17th December 2006, 10:46 PM

I would like to start today, so would my original dimensions suffice?

CarlosT · 17th December 2006, 11:13 PM

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.

CarlosT · 17th December 2006, 11:16 PM

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

17th December 2006, 01:00 AM	#1
Supa diyAudio Member Join Date: Dec 2006	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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17th December 2006, 11:32 AM	#3
Supa diyAudio Member Join Date: Dec 2006	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

17th December 2006, 12:23 PM	#4
Tenson diyAudio Member Join Date: Feb 2006 Location: Kent	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.

17th December 2006, 10:46 PM	#5
Supa diyAudio Member Join Date: Dec 2006	I would like to start today, so would my original dimensions suffice?

17th December 2006, 11:13 PM	#6
CarlosT diyAudio Member Join Date: Oct 2006	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.

17th December 2006, 11:16 PM	#7
CarlosT diyAudio Member Join Date: Oct 2006	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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