Home » Sponsored » Pi Speakers » Port Tube Needed for 2Pi Towers?
Port Tube Needed for 2Pi Towers? [message #62180] Wed, 24 March 2010 21:41 Go to next message
breakfastchef is currently offline  breakfastchef
Messages: 28
Registered: May 2009
Chancellor
I built these speakers almost two years ago. The plans showed a bass port, but no port tube. Is one needed for the 2Pi towers? If so, what should be the length.
Re: Port Tube Needed for 2Pi Towers? [message #62184 is a reply to message #62180] Thu, 25 March 2010 00:54 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18670
Registered: January 2001
Illuminati (33rd Degree)

The two π towers don't use a port tube. The duct is just a large hole in the rear of the cabinet.

Re: Port Tube Needed for 2Pi Towers? [message #62430 is a reply to message #62180] Wed, 28 April 2010 18:26 Go to previous messageGo to next message
dB is currently offline  dB
Messages: 234
Registered: May 2009
Master
In case the wood panel isn't of the same thickness (this being the port length, in case there was some differences) of the original Pi-Speaker project, you can recalculate the diameter of the port, for the same tunning frequency. Confused

Port Size for 2Pi Towers [message #62431 is a reply to message #62430] Wed, 28 April 2010 19:22 Go to previous message
Wayne Parham is currently offline  Wayne Parham
Messages: 18670
Registered: January 2001
Illuminati (33rd Degree)

That's right. The plans show port diameters for 5/8" or 3/4" panel thickness. Others are shown here:

For 5/8" wood stock, cut a 4.5" diameter port hole.
For 3/4" stock, cut a 4.625" hole.
For 1", cut the hole 4.75" diameter.
For 1.5", cut the hole 5.125".

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