Flare port Tutorial

[Lance1987]

hi all,

I have searched the forum but with no luck.

I'm a new poster, and im interested in building some 4'' DIY flare ports, i've already gathered some knowledge on it from the www.subwoofer-builder.com with respect to the math and calculations, but the site seems to lack a bit in the actual process of making the port,

Does anyone know a site i could visit to get at most a step by step tutorial or even if anyone has pics of the their own process,

I'll be using the method of building the mould and heating the PVC over it via hot air, looking at a Flare of about 25mm.

Thanks in advance.

 

[rabbitz]

Collo has a good section on the same site which describes exactly how to do it.

http://www.subwoofer-builder.com/port-flares.htm

 

[Augusts]

Hello

Me and my brother we made a simple excel calculator to use together with WinISD. Calculate the box and port, then input velocity and flare specification in the excel calc, it will calculate the velocity for a flared port.


Further on I read the "Maximizing Performance from Loudspeaker Ports" paper, it suggests that optimal NFR is 0,5 for this formula

That makes for a 50 cm long port a 50 cm flare radius, is this really the optimal radius?

And another question for laminar ports - could the same formula be used, by converting round port to a square port?