How To Measure Speaker Impedance And Other Specs

[@IBuildItScrapBin]

Welcome to Speaker World!

[@skm9420]

Yaaaa!

[@skm9420]

I'm in a bout of Celibacy because I rather enjoy my freedom also. Who needs women anyways am I right?

[@vivaanavery3571]

Pro tip : watch movies on flixzone. I've been using them for watching a lot of movies lately.

[@axtonlionel8841]

@Vivaan Avery yup, have been using flixzone} for months myself :D

[@jadenjaxson5998]

@Vivaan Avery definitely, been watching on Flixzone} for years myself =)

[@jnjarvis1]

“I like my freedom, what can I say”........as do we all John, as do we all

[@UberAlphaSirus]

DUDE! Loving it. I think it would be a popular series. Even kids want to build speakers, it will probably give them some woodworking skills.

[@rompdude]

This is stating to get interesting! Back nearly 20 years ago I used a book on speaker enclosure building to calculate the volume of a box and its ports to make a big woofer. They were only cheap 300w subs, but with the right box they really kicked! Looking forward to seeing the final results.

[@SteveC38]

It's really cool that you know all that stuff about building speakers and how they work.

[@RogueA.I.]

I have very little idea what you’re talking about but I like it.

[@paulhirst3548]

Once you get this finished I would like to see how it would do on your other channel. Finished in a nice cabinet or open baffle I think that it would do quite well. Hopefully it would encourage a wider audience to push outside of their comfort zone as well as to exercise some problem solving. We need more of both.

[@a_frade]

I have rigorously tested at least three different models of the Dayton Audio DATS, including the latest, Version 3, which features a black box. Unfortunately, none have provided reliable results. When comparing the data obtained from these devices to manual test outcomes for Voice Coil resistance, BL, Cms, and resonance, there is a significant discrepancy. My approach to testing has been meticulous: I constructed a specialized test bench designed to securely hold the woofers without any vibration. This bench is considerably heavy to prevent any overlap between woofer and bench resonances. Despite these efforts, the system's accuracy leaves much to be desired, falling far short of being either accurate or approximate.

[@lucianocaldas69]

Hi thanks for your nice video! Could you tell what system is that (little box & software) you used to determine the speaker impedance? Many thanks!

[@hankus253]

Thank you Professor Heisz that was a very enjoyable lesson.

[@johnconrad8796]

Morning Teacher! :-)

[@gokulselvam2270]

Hi sir! Can we do impedance sweep for 4 boxes which is connected in parallel?

[@billholt8012]

John, I hope you get in to enclosure design also. :)

[@mckenziekeith7434]

This video was awesome. Thank you!

[@IEnjoyCreatingVideos]

Nice video John! Thanks for sharing with us!💖👍👌😎JP

[@Maker238DeLoach]

Oh I love speaker world speakers are my friends

[@michaeltablet8577]

Cooler than the other side of the pillow! Only wish we could hear your speaker when you are done.

[@KSCPMark6742]

You'd be hearing what a compressed recording af his speakers would sound like when played through your own, most likely inferior speakers. Not very informative.

[@michaeltablet8577]

@@KSCPMark6742 yes I know. I meant I wish there was technology good enough to hear exact representation of the original source.

[@super_slo]

"Get together at John's house!" 🤣

[@KipdoesStuff]

I only live about 2000 miles south of him, he can point it south so I can hear.

[@thatellipsisguy8984]

Lossless audio file on his website?

[@ntme9]

If you have 2 identical speakers, one is rated at 4ohms/50watts and the other is 8ohms, is it safe to say the 8ohm speaker will require about 100watts to match the loudness? Also, if you have an amp rated at 8ohms/100watts per channel can it run a 4ohm/50watt speaker safely?

[@dougprentice1363]

FREEDOM!

[@ajhieb]

I guess I should have watched this before I typed up my rant about measuring impedance on your other video. My apologies, good sir.

[@stevewalker7822]

Very interesting

[@CDN_Torsten]

Interesting video John. I really like the test-dongle you have...didn't know such a thing existed. I also agree with you - the DC resistance of a speaker is only the starting point...I think the confusion for many people occurs because this term is frequently call speaker impedance. Though somewhat true, it is only valid at 0Hz. The actual impedance of the speaker is very complex (as you show), this is due to many factors: inductance of voice coil, frequency, parasitic capacitance, and mechanical characteristic which also has an effect on the counter-EMF generated as the coil moves through the magnetic field. Question: have you considered using dry sand instead of the metal weights? It _may_ produce more accurate results since I suspect the sand would be less likely to resonate. Messier though...

[@IBuildItScrapBin]

Guys get hung up on using steel and magnets for the added mass, saying something non-magnetic should be used. But I've tested that (before) and saw no difference. These weights and small magnets are just really convenient.

[@CDN_Torsten]

@@IBuildItScrapBin I agree the steel should have near-zero effect w.r.t. the magnetic field. I just thought the sand would be a better non-resonating mass that could be uniformly distributed. Perhaps I'm over-thinking this... Please continue with this series - speaker design has always fascinated me and brings together two passions: woodworking and quality music.

[@fuzzy1dk]

@@CDN_Torsten sand wouldn't work, if the weight isn't rigidly attached to the cone it only adds weight when the cone is moving upwards or very slowly

[@CDN_Torsten]

@@fuzzy1dk Ahhh...hadn't considered that - excellent point!

[@sphinxios]

the sound workshop software is updated to version 1.1.1 and it works with windows 10

[@IBuildItScrapBin]

Don't know what that is. I was using Speaker Workshop.

[@rompdude]

Should work 7 too as they are very similar in the backend

[@sphinxios]

@@IBuildItScrapBin sorry i made a bubu when writing it is speaker workshop not sound workshop

[@IBuildItScrapBin]

Do you have a link? All I found was the old one that runs on XP. Not that it matters, since I have this new program.

[@sphinxios]

@@IBuildItScrapBin here you go github.com/RDamman/SpeakerWorkshop/releases/tag/v1.1.1.1

[@_rlb]

John: "This is a 12 inch woofer" Also John: "I do all my speaker stuff in metric" ;)

[@dustinpryde3121]

Where's a great place to visit in Canada🇨🇦? Other than speaker world since I heard it's closed for Covid.... I went to Niagara Falls and Toronto last year... Both were cool but Toronto was a bit busy for me... would love to see some nature and big city or nice city anyways... Wouldn't mind moving to the great north. I'm sure the grass isn't always greener but wouldn't mind it.

[@isaeagle4031]

Qts below .4, better ported, .35 to .5 either, .45 sealed, .8 and up, infinite baffle territory.

[@stanhristov8990]

You are a good man :)

[@edwardl.2646]

i was watching one of your old videos are you still using your old wooden pc in your office and is the pc remaining cool also what is the over all size thank you. I would like to build one since it is hard to find a good case.

[@IBuildItScrapBin]

Still using it. There's a full build article about it on my website: ibuildit.ca/projects/design-and-build-a-wooden-computer-case/

[@chaseweeks2708]

Might have to disagree with the thought that imperial makes more sense than metric. Fractions and I don't get along. Even being a born and raised red blooded 'murican, I have to say metric makes much more sense and is much easier to perform math on. Still, even if I can never be an audiophile, it's fun to watch somebody having fun building something they enjoy, and learning/relearning/teaching along the way.

[@Peggyt-jp6mt]

There is always more to it.

[@mmmmmmm8706]

Children of John sounds like a cult in Speaker World

[@Sp3ncerSauc3]

Check out "miniDSP" and HexiBase. I learned a lot from them

[@Sp3ncerSauc3]

Also there's a software called winISD that can come in handy. Good luck on the project!

[@JimDockrellWatertone]

Getting way down that rabbit hole now John....lol. Is that smoke coming out of your ears?

[@Roffa73]

OK!

[@sween187]

I'm all ears.

[@thatellipsisguy8984]

34Hz for Heisz...

[@KSCPMark6742]

And here I was, "Hah, he finally got wood dust on his black clothes like the rest of us. Actually .. is that dust? Nope. He's still not fallible."

[@marc_frank]

you're not even old, why do you call us children? i'm only 19 😂

[@NordboDK]

Have you seen how our peers behave? 🤮

[@KipdoesStuff]

My children are 32 and 26, you are a 'children'. (p.s.- John is a few like -3 years older than me)

[@KipdoesStuff]

Just here to see all the 'expert' tell you how wrong you are on everything you said, lol. GO get em John.