First, some background - feel free not to read this if it bores you
I am busy designing and building a 2.1 system for music and a little bit of theater. The left and right channels are full rangers, using the Fostex FE167E, mounted in a 15l ported box. The front channels cross over to a single 12" sub at 95Hz with a fourth order active Linkwitz-Riley crossover.
Phase adjustment and sub level adjustment controls are included in the crossover I have designed.
The front channels will be powered with a LM3886 based amp for now, and the sub with a 200W amp of my own design. So far I have designed and built the sub, the amps and the crossover and am busy with the front channel boxes.
Now, my question.
I already own a pair of well braced 15l internal volume boxes made of 19mm MDF, which I would like to use. The FE167E data sheet has an example of this driver in a 15l box, with a port tuned to 67.25Hz. I would like to keep this frequency, as it works well with my sub. In this example, the port is a 5cm diameter by 5cm long circular port. Port velocity peaks at about 6m/s according to WinISD pro.
WinISD tells me that I can replace the circular port with a rectangular port 16mm x 82mm and 19mm deep - and get the same port tuning. Here, the velocity is still ok - peaking at about 12m/s. The advantage of doing this is that the box material is 19mm thick, so I can just cut a slot in the front baffle and get the port I need.
I mainly want to do this for looks. Are there any disadvantages to this narrow rectangular port approach that WinISD can't tell me about?
I am busy designing and building a 2.1 system for music and a little bit of theater. The left and right channels are full rangers, using the Fostex FE167E, mounted in a 15l ported box. The front channels cross over to a single 12" sub at 95Hz with a fourth order active Linkwitz-Riley crossover.
Phase adjustment and sub level adjustment controls are included in the crossover I have designed.
The front channels will be powered with a LM3886 based amp for now, and the sub with a 200W amp of my own design. So far I have designed and built the sub, the amps and the crossover and am busy with the front channel boxes.
Now, my question.
I already own a pair of well braced 15l internal volume boxes made of 19mm MDF, which I would like to use. The FE167E data sheet has an example of this driver in a 15l box, with a port tuned to 67.25Hz. I would like to keep this frequency, as it works well with my sub. In this example, the port is a 5cm diameter by 5cm long circular port. Port velocity peaks at about 6m/s according to WinISD pro.
WinISD tells me that I can replace the circular port with a rectangular port 16mm x 82mm and 19mm deep - and get the same port tuning. Here, the velocity is still ok - peaking at about 12m/s. The advantage of doing this is that the box material is 19mm thick, so I can just cut a slot in the front baffle and get the port I need.
I mainly want to do this for looks. Are there any disadvantages to this narrow rectangular port approach that WinISD can't tell me about?