Dayton Audio's DATS tester will check that, accurately. You need to invest in one; they measure the loudspeaker impedance, which gives a ton of information. It can be used to measure a speaker's Thiele/Small parameters too. This is the entrance to the speaker building rabbit-hole.

@davewiebespeakerdesign

Жыл бұрын

I did try and get a DATS tester, but they were unavailable to me at that time, this was better than nothing.

I like to hang some string over the port so I can visualize the port air movement. Another option is to use a DATS.

@davewiebespeakerdesign

11 ай бұрын

I did try and buy a DATS but they are under supply shortages in Canada atm. The string is a great idea!

Cool video. A little background on this. What is basically happening is the mass of the air in the port becomes a spring that oscillates at a specific frequency. Although it looks like the driver isn't doing any work, it's actually pushing and pulling against the back wave that is trying to move it, so it's exerting energy being a barely moving wall.

@davewiebespeakerdesign

11 ай бұрын

That's interesting, thanks for sharing, I'm often guilty of not understanding why it works just knowing it does, thanks for your insight.

@bobadingo

4 ай бұрын

And that's exactly what causes ported enclosures to sound inaccurate! because it is not a perfect world! in other words you can't have your cake and eat it too. On the other hand a sealed enclosure drastically improves response and frequency alignment relative to Output displacement at the compromise of efficiency, but' now amplifiers are so cheap for the amount of power we can buy! it makes absolute sense if you're a perfectionist audio file that demands accurate audio reproduction of High Fidelity than a sealed subwoofer enclosure is your only choice.. .

nice simple test thank you

@davewiebespeakerdesign

Жыл бұрын

You are welcome!

Hi, any idea how to eliminate a huge ammount of port noise? I've got a 6.5 Ciare HWG/HSG ceramic cone which is pretty capable, it makes a huge shuffle on a port. Builded a 10 L enclosure, first sealed then ported. If i stuff it fully with poly won't schuffle but driver will act like a sealed enclosure. Thanks

@davewiebespeakerdesign

3 ай бұрын

Sounds like the port is just too small for the enclosure. I would start by loading the driver in WinISD and build the box the driver wants. Porting a box is never as simple as just adding a port. I suspect your tuning frequency is way off what it should be as well.

@motorax.service.motociclete

3 ай бұрын

@@davewiebespeakerdesign exactly what i did, unfortunately driver needs 15L enclosure is aprox 10L. i've imput the port diameter in wini 3cm and gave me around 80mm lenght exactly the size of the port i bought :). The only thing it's not flared in the inside but i guess most aren't. I have another port of 4cm i think and will try with that one. Difficult around here in Romania to find ports this small. I would use a passive radiator but don't have the room for it. And if i use it sealed, by looking at the driver, compared with ported, it's excursion is way longer and wouldn't want to stress it like that. Tested with a plug into the port. Another option would be AP but don't have the room either :(

Just to be clear what are the advantages of doing this?

@davewiebespeakerdesign

11 ай бұрын

If you hear a speaker that you really like the sound of, this is one way to copy a variable, or to test a box you designed to see if you hit your target frequency.

mine stop moving only after 80-90HZ and never start moving again. what does it mean? p.s. i got some 15inch car subwoofer from my friend and I have no idea what are the parameters of it.

@davewiebespeakerdesign

Ай бұрын

If this is a ported box, start at 20 hz, sounds to me like you missed it, go up in 1 hz increments, take your time, you'll also notice when you hit the spot the port will be moving a ton of air while the speaker looks stopped. If it is indeed at 80 to 90 hz the box might need to be redesigned. My guess is either you missed the tuning frequency or the box isn't correctly designed. Do you have the make and model number of the speaker along with the dimensions of the box and port?

What app are you using

@davewiebespeakerdesign

7 ай бұрын

The app is called frequency generator.

can I use this method to sealed box?

@davewiebespeakerdesign

10 ай бұрын

Unfortunately not, you can use WinISD and plug in the box parameters along with the speaker driver parameters to know more about your speaker.

@ZuNunchaku

10 ай бұрын

@@davewiebespeakerdesign ok thanks. I use WinISD to build the box, but I want to know real life tuning.

@davewiebespeakerdesign

10 ай бұрын

@@ZuNunchaku You have me stumped, but if you have a WinISD design, couldn't you do base test tones and see where your F3 and graph is and see how close you hit your design? Either way, let us know when you figure it out.

@ZuNunchaku

10 ай бұрын

@@davewiebespeakerdesign the problem about testing is, im not audio expert. and I dont have any microphone that suit for measurment. based on my ear the sound really hits around 59hz preety high frequncy in my opinion

i've gone off ported. if you add more power and get more drivers the result is a 10fold improvement.. I see ports as a gimmick now.. ports would be good if you had the last amp on the planet but that's it.. my opinion

@davewiebespeakerdesign

11 ай бұрын

I might do the same as well, I've had some non ported speakers and boxes in the past and I have LOVED them!

Front right corner sub tested at 17hz approximately, rear left corner sub tested at 18 hz approximately using this method.😮

@davewiebespeakerdesign

10 ай бұрын

Wow that's really low. Enjoy your thunder in the movies!

I used a Hung Chang 9205C function generator and toilet paper. Didn't go through amplifier.

@davewiebespeakerdesign

11 ай бұрын

Another way to get the job done! I had to google the function generator, hadn't heard of it before, yes, I'm new.

@chuckmaddison2924

11 ай бұрын

@davewiebespeakerdesign I've had about 15 years and I picked up second hand from electronics repairer that was getting a new one. But still works good.

@davewiebespeakerdesign

11 ай бұрын

If it works good, no need to replace it.

"a hertz of twenty?" you meant to say "a Frequency of 20 Hertz". A box is not tuned to a specific Hertz, plase say Frequency so people dont learn it wrong. Otherwise, its a good Video.

@davewiebespeakerdesign

Жыл бұрын

Busted, you've got me, I don't go off of a script and sometimes I mess up trying to make sure I cover everything I'm thinking about.

@Elnufo

Жыл бұрын

@@davewiebespeakerdesign There is always room for improvement. Keep up the good work! ❤

@Bigg_Luigi

5 ай бұрын

🤓🤓🤓

“Keep that signal as pure as possible” eliminates a Bluetooth connection for me. Look into it and you’ll see why.

@davewiebespeakerdesign

11 ай бұрын

I have no doubt you are right but I will check it out, thanks for sharing.

Whacky

YoU need DATS as the FS on drivers is wrong most of the time.. um18-22 should be fs 19hz but its actually 26hz.. I wondered why my graphs wasn't matching up with the box programs and now i know why.. MANUFACTURERS TELL YOU LIES

@davewiebespeakerdesign

11 ай бұрын

I've tried to order a DATS several times, no luck for Canada atm, supply shortage...