Box size?

[HareDesigns]

I've been wondering, while making a ported box, sometimes the ports get really big, now when calculating the volume of the box do I take into account the volume that the port and speaker itself take up and make the box that much bigger or is this irrelevant?

thanks up front

H.H.hee

[AndrewT]

The free volume inside the box is what matters to tuning a ported speaker.
The volume taken up by the driver and the port and the bracing and any other stiff & impervious material must be subtracted from the gross internal volume to arrive at the tuning volume.

Similarly the volume of air in the port is what matters for port tuning. The volume of the port enclosure (the wood/plastic) is not included in the tuning/port volume.

[sreten]

Hi,

Its certainly not irrelevant, but with good initial design choices, and the fact
that lining a vented box well increases internal effective box volume, it is
often the case you can effectively ignore the driver and port volumes.

Many make the port too big, too wide, and therefore too long. You don't need
full power handling in the bass for a 2 way, you do for a sub, the 2 way needs
headroom for the rest of the frequency range, and the port practically only
needs to handle 1/3 to 1/2 of the amplifiers full power at the most.
(Often much less due to general excursion limitations above port frequency.)

rgds, sreten.

[HareDesigns]

Thanks for the info guys, appreciate it