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What are the consequences of a small port for such a large woofer?Small port, small bass, bass depend more on the box stuffing type and quantity used.
I tend to think the Altec engineers knew more about box tuning than the new computer models would imply. The factory tuning seems to match the woofers output very well. We are just used to modern over damped "audiophile" designs now. A bit of DSP room correction and classic Altec bass is a force to recon with. I have yet to hear a modern speaker that I prefer in that area.
FRM is right.http://audiojudgement.com/bass-reflex-speaker-design/
But I am going to mention that (for a given speaker) the tuned frequency of the box (fB) will depend on 3 factors :Length of the portRadius of the portVolume of the box (VB)
Damping material. Like with sealed enclosures, damping material can be used to reduce panel resonances and standing waves. Unlike the sealed enclosure, you don’t stuff the box with damping material, because you will obstruct the port. Just place 1-2″ absorbent material on the the walls of the enclosure (on one of each opposite sides or all of the walls).
The response of a ported cabinet is determined by its volume, port length and area, and woofer parameters. The stuffing will have some effect but it's secondary.
Correct, a woofer wont do midrange freq as a midrange driver.
Tell that to an Altec 414A.
Uh? Tell that to Tannoy, Shindo, Altec, Western Electric and.....In my DIY 2 way, I am putting on various size back panels to experiment w port sizes. The differences aren't much. Even compared to a sealed cabinet. In fact, I have been experimenting w one speaker sealed and the other (see picture) w a port. I can barley hear the difference and the imaging is rock solid. In contrast, taking out the internal dampening (3/4" wool covering all the walls) and replacing w bracing was a huge improvement. Now, I only have dampening on the back panel. Still tinkering here.
Why you guys dont quote the John post?Many cone midrange drivers do good quality bass, but I suspect a woofer dont will do a nice 2kHz tone imo.
I'll say it plainly: you are flat-out wrong. The Altec 414A will run clean 3-4khz. In fact, you can run a 414A with no crossover and bring a tweeter in at 3kz - 7khz with a first order crossover.There are a handful of exceptional drivers, but they may be out pf production or quite expensive now.
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