Problem With Stuffing Straws in Port

[nobb]

Hey
After reading through the tweaking section, I tried to reduce the boomyness of my subwoofer while deepening bass response by stuffing straws into the port. I really like the sound now, any I have never seen such an effective tweak. The only problem now is that whenever I turn up the volume, excessive port noise can be heard. How can I reduce or even eliminate this port noise? Before stuffing the subwoofer's port, I have never had a problem with port noise. Any help would be greatly appreciated. Thanks.

 

[Sycraft]

I imagine you must trade one for the other. A bunch of straws are going to screw with the airflow comming out, and produce turbulence, hence noise. I imagine at low volume (and thus airflow) levels they are fine, but at high levels you get distortion.

Remember: The reason for a port to exist is to allow air to flow out. Thing is, basically all subwoofers are in a box that's too small for their driver. That means when it gets to moving, there is backpressure. As it moves in and out it changes the size of the box, and the ideal gas law dictates that if a container gets larger or smaller with no other changes the pressure must decrease or increase. This causes additonal resistance for the driver to fight against and messess up sound.

The only options to solve it are large enough boxes to make the effect negligable (like Dunlavy did with their speakers) or a port. Well, if you mess with the port, you are messing with the airflow which will bess with sound. I mean on B&W speakers, they go as far as to dimple the ports like a golf ball to reduce turblence.

So I'm guessing you are in a one or the other situation, you either leave the straws out and get less noise at high volumes, or leave them in and deal with the noise.