Something I’ve always wondered but never seen tested, fantastic! I’ve seen a few of your videos randomly before but am now subbed👍🏼

chestii foarte utile pe canalulñ tau , raspunsuri la intrebari care chiar mi le puneamsau video cu vatelina( dampening material) la care ma gandeam ca e un mit, si cand eram mai tanar faceam tot felul de teste cu boxe de exmplu in loc de vatelina puneam polipropilen ( zapada ) chestia aia de la pachete si mi se parea ca are mai mult bass dar de fapt cred ca rasuna mai mult cutia. multumim pentru clipuri .

This was a good video, something ive wondered about.

Excellent video and info! Thank you.

I can definitely hear the differences you mentioned in the speakers as far as the depth of sound field etc like they need to be in the room to tell that. But as far as the differences in a female voice, the hi-hat and the different sound of the drum, I can't definitely tell the difference

I have 2 18’s in my truck and I placed the port near the roof in the middle of the 2 seats, perfectly square port which is better than a long rectangle. 4th order bandpass

Great video, very well explained and answering exactly my question! Thanks a lot I suscribed :)

wow, great work. thank you very much :)

Great video been wondering about this. I am curious though about the effects of ports placed so the they fire across the face of the driver. I believed JL Audio makes one and I just saw a Gately Audio box with dual ports facing each other across the driver front. I know this would be an advanced design but would be interesting to see if there’s any advantages to it.

It would interesting to look at port placement effects just on the front of TABAQ and Pensil type enclosure designs. These are tall, vented, enclosures with small cross sections made for 3" drivers where the speaker driver is at the top front and the port at the bottom front of the cabinet. They're almost like transmission lines and I suspect that there is a "false bass" peaking from 100 - 200 hz. Most current 3" drivers have an fs around 100 hz.

Nice box, any advantage or drawbacks to having ports facing across the woofer front?

Great one 👍

Also can u consider making a Ripole sub and a dual driver push push or push pull in subs

I had some Audio Pro floorstanding speakers that had the port down firing, and it was just a two way, so one small (5-6" I think?) driver and a tweeter. It had significant sub bass output, good below 30Hz.

Cool video and channel! Subscribed!

Im confused so a rear port will result in box loss?

you're awesome

does the frequency of the standing wave move up if the box is shorter? do you know the relationship between the standing wave and the height of the box, like a full wave, 1/2, or 1/4 waveleingth? thanks

I have questionable Design Idea for my car, listen... I have a BMW E36 Sedan, the problem is, i cant just put in a ported sub that plays into the trunk because the trunk is closed of, the back seats are mounted on a solid back plate out auf aluminum. I have a ski back wich is pretty small... So my Idea is to build a box with the port extending out of the box going OVER the Subwoofer driver itself... do you think it will work? The only other ways to build a box for this car is either a bandpass (wich i really do not want, because it will be more complex and bandpass most of the time does not sound as good as ported or closed) or a closed box with the driver sitting behind the ski bag wich I dont want either, but consider it more if ported wont work. Should i just try?

Wich better ?

There's a trick with standing waves that can be used to minimize the problem with port resonance. Basically you need to design the box in such way that the mouth of the port is located around a null of a standing wave that is created inside the box. The standing wave must be of the same frequency as the port self resonance freqency. I want to try it out in the future with a small full range speaker. The problem is that WinISD seems to miscalculate the port lengh and with it the port self resonance frequency.

Would not a typical 24 db/octave low pass XO @ say 80Hz mitigate the standing wave issue or is that a natural harmonic that can't be filtered out?

great and awesome video! what about a port on the bottom…with proper gap btwn port and floor?

Thanks for the great video Can u make a video how to measure example at 9.13 how to measure this. I have umik mic but don’t understand for to use it

i need your help how can i send to u the pic of my box it have 2subwoofer 12 inch and tell me where i put the port and its diamter??

What about on top of the box? For stereo speaker gives an extra "surround".

There is any problem to install passive radiator which is 2 inch smaller than woofer?

Missleading. Re-measure your floor stander, but not at nearfield. Just put it down in your room , close to a wall. Put the mic at a reasonable listener position . Now we can talk. 1. Behind the magnet, not a good place . At higher volume you will have more port noise. 2. Difference between forward and rear firing comes from the effect of the wall behind. Basicly you can modell that as if your port would flange out drasticly. 3. Yess I em aware that this is mosly room accoustics. Argue about it only, if you listen to music keeping your ears kept at near field. Same goes for down firing ports. They get an extention with a huge flare. Backward and forward firing allso has phase differences at the listener position. Hence nearfield will show nothing out of that at all ever. In a car sub it makes next to no difference , as long as the port is not choked. That is correct. The rest you say is invalid. And can be with ease tested with the setup i described. Allso about standing waves... look , it exsists in subs too , and whit all speakers. Ever. No excuse. What you can indeed do when designing is avoiding sqaure shapes. Not ideal but you could set up your dimensions to give the desired volume , and having a ratio of the thrid root of 2 vs each other. So A side internal is say 1 unit , B side internal is approx 1.256*A C side internal is approx 1.256*B Thatway at least the resonants will not share a harmonic and not add up. A nother oldschool solution is to suspend in the middle of the box somen spongy dampening material. Make sure the string you use is some wool of othet type that makes no sharp sound. That will break the path of the standing wave , and allso absorb reflections. Just some old school 60's era advice .

What are the dimensions of your box and port?

Wait wait wait +1db gain is insignificant? A 3db gain is equivalent to a doubling of input power. Not to mention your first measurement comparison had a lower -3db rolloff point in addition to that +1db in output, making it significantly superior.

Hi, nice video it really help me a lot but i have a question. I am building a bookshelf speaker with bass reflex box. My problem is because the speaker and space i have, and also because in my country there is no many places to buy ports i was thinking in 3D printing my own port with my customs needs. It is okey or i have to take care of something. Thanks for all!

Oi, Marius. Nice to see you again. Have you read your mail past three mounth? I've send you one about some awesome discovery in crossover building i've made. Check it and lets have a talk (:

Here you can see why MDF is shit for Speaker Building. This is a Video of a Vakuum Tablet and a 19mm thick MDF Plate on it and it can still hold a sheet of Paper through the MDF: kzfaq.info/get/bejne/j7x4oriXnpzOlnU.htmlsi=mQs_jYgZAxeBnND8 Your "Normal" Leakage isn't normal with MDF.