Hello,
Say a cabinet has four mid/bass driver units arranged in a vertical line and a bass reflex tube below them.
Is there an optimal distance between the bottom driver and the bass reflex tube mouth below it?
Thanks.
Say a cabinet has four mid/bass driver units arranged in a vertical line and a bass reflex tube below them.
Is there an optimal distance between the bottom driver and the bass reflex tube mouth below it?
Thanks.
I would have thought not. Some people even put them 'round the back! It then looks like a closed box from front on.
Down at 30-60 Hz, where most reflex ports are tuned, wavelength is 5 to 10m so it makes little difference to the bass output.
Well, the one thing you'd want to watch out is that the woofer isn't blowing right ACROSS the port. This might be a concern inside the cabinet, if the port was on the back or bottom.
No!
When the vent is active, the drivers are barely moving. At the frequency where this occurs the ear has lost its capability to detect where the sound is coming from and wave length is a magnitude larger than cabinet dimensions.
WHG
When the vent is active, the drivers are barely moving. At the frequency where this occurs the ear has lost its capability to detect where the sound is coming from and wave length is a magnitude larger than cabinet dimensions.
WHG
Judging by these measurements(audio blog: More on the B2031P and diffraction), ports on the front of the box are a bad idea. Head Unit mentioned sound waves blowing across the port and it looks like he is correct.
This guy's done several front ported speaker measurements that seem to get improved by blocking off the ports. audio blog: ADAM A3X Port Stuffing Ritual
audio blog: ADAM A5X
Maybe port placement is more critical for the midrange and treble than for the bass by the looks of things. Something to consider. Perhaps a 3-way would be okay in this respect. It doesn't seem like it becomes a problem until over 1,000Hz. Bigger waves may just skip right over it.
This guy's done several front ported speaker measurements that seem to get improved by blocking off the ports. audio blog: ADAM A3X Port Stuffing Ritual
audio blog: ADAM A5X
Maybe port placement is more critical for the midrange and treble than for the bass by the looks of things. Something to consider. Perhaps a 3-way would be okay in this respect. It doesn't seem like it becomes a problem until over 1,000Hz. Bigger waves may just skip right over it.
- Status
- Not open for further replies.