What is the best Port size?

If you wanna know what LENGTH your port should have, check out: "What is the best Port length?" https://www.youtube.com/watch?v=RDEEm-JW7ic

I only watched a few of your videos yet, but so far i love them. I love how u break things down and go into depth on subjects. It really has taught me alot. Keep the videos comming and I will keep watching. Thanks for all the advice.

Finally the youtube algorithm suggest something i WANT to see

Finally something I actually want to watch.. Thank you

This video is infinitely easier to follow than the others. Thanks!

Found this video while trying to tune the port on my 2x10 Ampeg (copy) bass cabinet, 50L. Did the math, it sounds spot on. Thanks!

ported enclosure sounds good on bigger speakers but I always like the passive radiators in motion also it only need less box size.

Below the tuning frequency, ported system acts like open back enclosure. To maintain some back pressure on the driver I find keeping port area to be 1/4 to 1/8 of the driver cone area works the best. Of course there're systems like Altec A7 where port is much bigger than the driver ( but driver has reasonably stiff suspension that supports the driver cone )

Very accurate, great detail and description. Good video bro. Keep it up.

Thanks dude, this was incredibly informative, like most of your vids ofc!!

The information here has been proven over and over and never fails. I’ve seen videos of these kids with these new subs with higher power and they think they need a bigger port.

I built a 100L sub tuned to 20hz, and used a 9.9cm/ 3.875" diameter port. Then I built a second version using 2 ports that were the same 9.9cm diameter. Comparing the two, the single port design had noticeable low frequency compression @80dB+, and the THD measurement showed a peak of 10%+ from 20-30hz. The 2 port design had no compression at 80dB, and THD was 2% at 80dB. (The sub is built into a full range floor standing speaker, so I have vertical height for tubes the full length of the port.)

i would like to see experimentation with adjustable port size to demonstrate it, with various musics and tones. Great Video, and thank you kindly.🌺

Heya. Valuable info. The technology came forward a lot, and nowadays if you know what you´re doing, and use high end drivers, you can use the port very differently. No need to optimize the port itself for best accoustical performance anymore. Golden ages. Now I can afford to optimize the port for impedance shape, for cooling, Group Delay and transient response (boomyness) and such. It is great helper to make efficient compact system now, instead of desperate need for speaker to produce any SPL at the bas region. That way I can afford to put a 21" speaker into compact 230l box, measuring 58x58x76cm including feet, handle and 100mm casters, load two into european sized car, and make quite loud gig for 150-200 people. Hope IPAL and M-force technology comes forward some more, so we increase the power density even more.

yes there's a math to the correct port size .. I owned a custom car stereo business back in 80s 90s we built hundreds of sub boxes we called it tuning the box ..the port is crucial to the specs of the box and cubic internal air space also is crucial also depending on the speaker used

Long live the BOSS,finally I got what I need,god bless u

... definitely one of those critical aspects, often overlooked in DIY's...

I like the sound of an overly long port. In fact, I mounted some tiny speaker cones at the end of some wrapping paper tubes, and it sorta sounded good! (A little echoed though.) the resonance frequency of the smaller one that I had was 58hz. I could not tell the bigger one though.

Im building a 5.25" pc drive bay speaker out of styrene plastic and 2x 3w creative drivers out of a creative travelsound 400, im opting to rear port it and am going to make it rectangular as these seem to work best in my experience, the port will be exactly half the width of the enclosure. these little drivers sound absolutely beautiful with a PAM8403 5V class D amp, the amps are tiny and pack a punch, ideal for drive bays.

I think it all depends on your goals ur driver and vehicle, if u r firing into an open cabin jt will vary then if u have it dead against a back gate