Acoustic Amplifiers & The ELEGOO Mars

Here's a way to "amplify" your highs without any additional power or cone area, and a look at the already well-established ELEGOO Mars resin printer.
ELEGOO Mars amzn.to/32BSfI5
Audio Dynamics adcaraudio.com
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[@cfmechanic]

I love how high tech and scientific your videos are.

[@Scott_C]

It's one of the reasons I'm subscribed.

[@detroitengineering782]

Agreed

[@johnrocketman4844]

Feedback regarding recent videos...Like the 3D printer tech, don't like the fisheye camera lens from the outside part of the Earfun video as an example. What I would really like to see is a 6th to 8th order bandpass (with full range driver also) designed to be apartment neighbor friendly at 55-265Hz for the fully non-visible 4.5-5.25 inch driver that you select where the port is on the same face as the full range driver 3-inch or less that operates from 265Hz (approx.) to 18+KHz. I appreciate the previous full range design - BUT I don't like my vocals vibrating at the same frequencies as the kickdrums and the tom-toms (3rd and 5th harmonics). Please consider a Fatal Pro or Eminence driver for efficiency and low power, low distortion. Also slightly recessed binding posts and some way to grab the box with fingers but not a full ugly handle. Also I like to see "other Peter" and I will donate for you to print Sophie(?) a 10mm hair clipper attachment for her sides so that I can tell you guys apart. I am following your directions and almost never leave public comments, feel privileged. BTW my frequency numbers come from analyzing Cheap Trick "Ain't that a Shame" (using Audacity) which is an example of music made with instruments. Please listen one time before designing. Remember anybody can stuff a box with a big woofer - but that is boring and few want to see that. People love craftsmanship, sophistication and recessed binding posts, Thanks!

[@21degrees]

That idea would get a million views if he made it with Bluetooth 5.0 and used 4 x 3.7V (14.8 volts) batteries and TI amplifier!

[@mr.boxman2244]

Rocketman - check out CarAudioFabrication he did something like that 5 years ago but no BlueTooth kzbin.info/www/bejne/paqnY2iOl6yfm6c

[@barbarafreeman6479]

I agree, we could use that. CarAudioFabrication did something like that with wood based PLA.

[@carloslopezgreses3947]

Nice project once again Pete. I would love seeing you build a full range portable bluetooth speaker.

[@jaymack396]

Cant wait, great video as always

[@krazeykruzey]

@@HexiBase great to hear! ive been hoping for this myself

[@haley8004]

I want to build a BT speaker with two parts for stereo separation, a dsp crossover, pure digital amplification

[@barbarafreeman6479]

Must be a 2 way bandpass thanks!!!!!

[@ac.creations]

@@HexiBase Id probably buy it, Can it be IP rated? Im used to a jbl thats ip67. What do you think of the Charge4 dual sub speakers

[@G3ML1NGZ]

Just a note about the SLA supports. The print failures were due to direction of pull vs support placement as the parts lift off the FEP they're stuck to. The bottom brim f the horn was supported but not actually the back right next to it. Meaning that as the print reached back the pull of the FEP would pivot the edge of the horn backwards since the pull is behind any support making the part distort. in short. More supports behind the lowest brim

[@RinksRides]

I too discovered the joy and pain of resin printing. Dense supports are required near the shallow Z points/angles to prevent distortions.

[@GENcELL2014]

I'd highly recommend getting into using the 3d printed parts as blanks for making silicone molds to create far more durable resin parts with better material properties than a layered structure(3d prints). It's also faster than 3d printing for making multiple parts or enclosures.

[@barbarafreeman6479]

Hexibase Please give us a bandpass 2-way enclosure with 5-inch and a midrange 3D printable with Bluetooth.

[@olimpather]

New 3D Printed project. New 3D Printer. How wonderful!

[@stromlo]

I have an Elegoo Mars - and I've printed some pretty wild designs. I was disappointed in the beginning with the same results you see there - but after having it for about a year now I can tell you that horn is definitely printable! It needs way more supports though.

[@stromlo]

Send me the step file and I will attempt to prove myself right :)

[@jasperrost78]

I think so too. Probably fixable by reorientation and support.

[@Excaliber158]

It's 100% due to poor supports. I think he is too used to FDM printing where the only force you need to worry about (in regards to supports) is gravity. You're also fighting against suction! If this was supported properly, it'd have ZERO issues.

[@swetardhd3880]

Video series idea: Go through the design process of the different types of subwoofer boxes. Start with the basics of all of them, like which T/S parameters are needed and so on and what program(s) you recommend. Then go into more detail on the different kinds of enclosures. Go through in detail how to know what volume(s) and tuning(s) for a specific sub and for a specific purpose in a given enclosure design. Start with sealed, then ported, then 4th order bandpass, 6th order bandpass, T-line and so on. Do individual videos on each type of enclosure to really go deep into the subject. Anyone can download a program like WinISD or Bassbox Pro and stare blindly at the graphs, but that only gets you half way. Not everything works in reality the same way it does in a simulator.

[@detroitengineering782]

I love this! Just found my next print!

[@scottiffanimccord1509]

Wow such a impressive us of your genius. So much to think about! Thank You!

[@arcechome1655]

I like how you managed to merge 3d print and audio together. Great job

[@Helectronics]

Great video!

[@BStreet666]

Absolutely impressive how much of a difference the horns made the tweeters sound! I was not expecting that. Always looking forward to your content.

[@geemail369]

Wanna try "cupping" your ears using your hands to get an impression of how much of your actual speaker output is lost due to "poor ear design"?! 🤓 You'll be _surprised!_

[@Watchingyou-daily]

The 1.5kHz resin horn made the dome tweeter sound the best. It gave it better clarity and crispness.

[@philmissy1]

Used widely in home audio but ive never seen or considered it for car audio. As much as I love DSP but being able to adjusting acoustic's and over all sound by means of positioning, materials and methods is not only more satisfying as an installler but well it feels less like cheating to get to the desired sound. Why adjust a frequency electronically when you can adjust the wave itself. Love it.

[@psementalist]

Bravo excellent good video Pete good topic of choice for discussion 👏 👍 👌

[@the_nondrive_side]

Well done throughout. The 1.5k horn really did a great job. I wonder about rehoming the drive units and electronics from my OONTZ angle.. I have a stereo pair and a horn loading with the passive resonator adjusted to work together.. Oooh

[@McTroyd]

Nice as always! Personal preference was the 1.5 kHz horn, at least over KZbin, though I expect it radically reduced the audio sweet spot in the room (as you'd illustrated). I've seen on other channels that acetone vapor can help smooth out filament prints. Obviously this does nothing useful for small parts, but it could be useful for something like this horn design.

[@lotechgreg]

Thanks for all you do. I REALLY enjoy your content. ANY printable wave guides/horns for easily accessible "cough"/Parts Express/"cough" drivers, IMHO would be a GODSEND to the community. ... Along these lines, I personally would LOVE, any reviews/ratings of said, "easily accessible" drivers. .. Again, Thanks........

[@Project337]

I would buy those tiny transmission line prints as keychains.

[@manjulwalia1995]

Beautiful :)

[@Thatdavemarsh]

Love this stuff! Feel free to dig deeper into the math and physics! PS a video on passive (or active) home made cross overs would go nicely with your speaker projects! I’m enjoying your first gen design in my Jeep with a small 25W amp and high to low level converter. A variable cross over would be a nice addition but want to avoid attenuation that a simple RC or RL circuit might generate. Cheers! Love the channel.

[@lemoncfpv8434]

excellent

[@yommmrr]

Wow those horns made a massive difference.

[@VioletGiraffe]

Great video, great ideas, love your technical insight with no marketing bullshit. Subscribed and hoping for more :)

[@greggarner4477]

What a difference!

[@pwredwtx]

Hi HexiBase! Love your videos, they're very informational and detailed. I was wondering if you are planning on making a series of videos about enclosure design? What, how and why kinda stuff. For example what software do you use for calculations, what things you need to take in account when designing enclosures, things like that.

[@pwredwtx]

@@HexiBase Thanks for the reply. I'm happy to hear that!

[@ElliHoy]

thanks my neighbours dog is going berserk now

[@ltcuddles685]

If you haven't already you might consider using prusa slicer instead of chitubox to create supports for your resin prints, Apparently it does a MUCH better job.

[@BUZDRIFT]

Huuuge difference would love to see 1" , 2" and 3" versions! load em up!

[@ASMRCulture]

Am I the only one that really wanted to see a tiny earbud driver placed in the 1/3rd scale t-line print, just for fun? 😂

[@pranit9668]

I want this guy to teach at a university

[@LawrenceTimme]

Then you would have to pay him $50,000 a year rather than watching a KZbin for free. No thanks. Careful what you wish for

[@weareallbeingwatched4602]

@@LawrenceTimme actually lots of universities post their lectures on KZbin. Also, the internet is not remotely free. The computer industry's set of business models have proven to be in practise basically monopolistic.

[@mr.boxman2244]

Technician makes $50,000 and a Professor makes $120,000!

[@393strokedcoupe]

@@LawrenceTimme Let's hope he receives more subscriptions, Lord knows he deserves it. Win win.

[@1stzard]

who said professors don't post there lectures or findings on youtube, why not do both. They would be teaching a wider audience in the end. Don't get so caught up in there finances

[@SessoDeluca]

That's interesting because I printed a sink strainer that has similar curves without issue. However, I use the creality resin printer.

[@mr.boxman2244]

Once again the driver is too large or too small. Can you consider a bandpass with 4.5 to a 5.25 and 8th order bandpass with a 2.5 inch driver for 300 Hz crossover? The 3D printer is great..don't give up so easy on resin.

[@21degrees]

I agree completely!

[@dynaudiofocus]

Excellent video, do more on horns please

[@kencohagen4967]

I’m trying to resurrect a set of driver I sued years ago. I have a pair of 10” Dayton woofers that are supposed to go down to 32 ha in a ported box, a pair of 6 1/2 in woofers that I might use as midwoofers, a pair of dome mid ranges that have great imaging and a pair of tweeters that do not. I might replace the tweeters with something better, but wondered about horn loading them and your test seemed to show an improvement in response. Then again, I might horn load the dome mods to see what that would do. All food for thought at the moment, I hope to be able to consult you once I get ahead of some medical bills that one encounters at my age. I hate getting old. You’re always young at heart, but then your heart throws you some curves, including a birth defect that could have killed me years ago. Shit!

[@neur303]

I heard a horn is more something like impedance matching than amplification? Probably even in one of your videos. I am coming from an electronic engineering background. Do I understand it correctly that the 1.5 kHz horn flattens the response by adapting the mechanic/acoustic load so that the characteristics of the unloaded speaker are compensated? And the "amplification" happens also by adapting the load to allow the best power transfer and reducing "reflections"? Thanks for your cool videos and allowing insight into the processes. It's a rarer occurrence on KZbin videos since technical details might overwhelm a lot of people. I think you hit the sweet spot of digestable information and still be entertaining even if one does not understand everything. Also I love your technical background videos! Take care ❤️

[@marttiinnanen4911]

Impedance matching increases efficiency which increases output. So it amplifies wihtout being an amplifier.

[@amirbasssystem]

Early in for checking in

[@rwhipple73]

Wow!

[@Blake-jl8lh]

its not a limitation of the print style, you just need more supports

[@WalterWhite-pr1qs]

Great for watching while high 👍

[@3rutu5]

awesome video mate, could you use the larger waveguide on lets say a 1.5'' full range driver to get that added 10db boost? I know a few of those vistron drivers have low sensititivy and could do with an added assist. (im looking at you BF37)....

[@Vibration_Crew]

Maybe a Bi-radial horn (square or rectangle) would work better in the 3d printers?? Print it mouth down if there's space in the tray? Great video as always. Anything to do with sound and printing always peeks my interest & thx for sharing your knowledge.

[@PvMLad]

Please please make a video on a dual 12 inch isobaric push push 8th order band pass subwoofer enclosure

[@madmax2069]

I would love to see you put some tiny speakers into that small enclosure mainly just for the lolz

[@supersteveenglish7340]

Good comparison. That micro TL looks extremely high res.

[@lonewolf3316]

This guy is an asset to society, protect him..

[@robertpepperwolfe7256]

the scientist of sound

[@kiabass8798]

You could start manufacturing horn speakers

[@TrentinSolo]

I think the main reason for the print issues is gravity. On resin printing, gravity pulls away from the bed, which can cause sagging. As such, even if the print is at a good angle with no overheads, supports are still needed to keep the model from sagging. The resin is still somewhat soft when printing and, especially when printing larger models like these, the weight is important and can warp the print if it is not properly supported. It seems to me like you used very few supports, very few of which were connected to the parts that deformed

[@Mendal2000]

Pete I think part of the issue with printing the horns has partially due to the supports and the orientation of the print. I didn't see your horns posted on your thingiverse, have you posted them elsewhere? I would like to take a stab at seeing if I can get a successful print. Awesome channel and content. Really enjoy what you are doing here. Thank you!

[@Stelios.Posantzis]

This is a very interesting experiment. I wonder how far one could take it, i.e. print a compression loading chamber for use with one of these tweeters. The tweeter dome is not fabricated to deal with such abuse but it would be interesting to find out how well (or not) it would compare with a compression diaphragm in this use.

[@TheBruster123]

Fantastic video about resin printers! Now time to put your big boy pants on an use a proper one like the formlabs form 2 or 3 😏😉😉

[@baronvonfritz]

Could you do a video on internal enclosure geometry and how reflections, absorption, and wall resonance affect response? You sort of touched on it when you re-stuffed your sub enclosure. When you modelled different configurations but volume remained unchanged, it moved the response curve. Theres next to no technical content with measurements on the youtubes. Probably because of the effort involved constructing said enclosures, but multiple printed enclosures of a set volume but different internal geometry would be easy to demonstrate. Thank you for all you do! Cant wait for the next one!

[@lunchboxbailey]

HexiBase please do- the enclosure I recently built has two window pane style braces inside and while the displacement volume is accounted for, I did wonder how it would affect the overall response. Or if they were (both) really even truly needed.

[@baronvonfritz]

@@lunchboxbailey I just built one like that too! I could hear the difference with and without the braces when doing the highly technical and extremely accurate knuckle knock test... S/ I imagine the unbraced wall areas resonate at their excited frequency if the driver outputs that particular freq. The more unbraced area, the lower the f(wall) and the more "ringy" the enclosure. I think the bracing makes smaller resonant areas, pushing the resonant frequency of the remaining unbraced area up out of the woofers range. This is all in my imagination tho, a seriously flawed modeling computer at best. Ts'why we need Hex to illuminate our subsonic world.

[@ollie_321]

You could have got much better print quality using probably the same amount of supports for the FEM print if you stood it vertically and relied on good bed adhesion. Otherwise great video

[@lastwymsi]

I want to see what the mini mini sub would sound like if you could find speakers that fit it. Even just as a novelty

[@noochmahh]

awesome video. where is a good source of info for learning about the theory of modeling enclosures that would teach you about the properties of enclosure capacitance and inductance? I have done a lot of searches and cannot find any material on the subject. I just want to better understand what you mean when you are mentioning those properties. Thank you

[@iwanbroodryk3655]

Curious to see what a Dayton Audio ND16FA-6 5/8" Soft Dome Neodymium Tweeter will do when mounted flush to a spherical baffle. How does your off-axis response compare to that of a flat baffle?

[@clee2423]

i'm planning to make a waveguide for SB Acoustics SBST19C-000-4, its a good tweeter for its price tho

[@simone.3368]

is it just me, or is the background base track quite strong to the right ?

[@SianaGearz]

Third reason that comes to mind is to even out the offset between the midwoofer and the tweeter and tilt the neutral axis back into horizontal, because having it lean down is no good at all. Or is it just that i suck at crossover design? I can never tell.

[@Scott_C]

Those tiny prints are neat! Could you use them with super tiny drivers like ones from some wireless ear buds? What quality do you think that would produce?

[@elladamerie]

great video with tons of knowledge delievered. I enjoy watching as I'm interested in 3d print too. I might get a printer soon for work. Any recommandation?

[@elladamerie]

@@HexiBase thank you I shall follow you're recommandation :)

[@minus3dbintheteens60]

Very interesting, the wave guides totally ruined the response of these already OK tweeters, but it makes me want to experiment on some AMT's

[@CORZER0]

Agreed. They overemphasized and hollowed out the response.

[@Azettler1]

Hey Hexibase, I love your videos and am really trying to get into speaker design coming from an electronics background. I keep reading that chambers can be modeled using standard electronic components, but have no idea about how a geometry (volume/port) translates to this model. I really like your designs and know you use proprietary software, and if you don't mind me asking, what are the software packages you use to achieve your results?

[@ChiTownTino]

Can u make a full range speak with both bass speaker and tweeter?

[@FSXgta]

Could you do the resin horn in two parts? Would that help with the warping?

[@jasperrost78]

@@HexiBase you can also print stuff in multiple parts and glue them seamless with resin and a 405nm torch.

[@pravardhanus]

Now I came to know about Resin Printers.

[@user-xb4nn6ql5l]

where you been?

[@ltanzil]

how do you calculate the design for the horn, what software do you use?

[@marttiinnanen4911]

Hornresp is a good one

[@10010Linus]

what if you get some tiny drivers and put them in the tiny TL box? that would be interesting

[@neur303]

@@HexiBase HexiMids 😋

[@Scott_C]

I'd love to see how some hacked open cheap wireless ear buds would sound if they were stuck in them! 😁

[@neur303]

@@Scott_C Funny idea! Probably not much different though than when you form a cavity with your hand and stick it in there 😋 But we have to know for sure!! 😉

[@edoardogasparotto6241]

Dear hexibase, I was wondering if you could explain to me the difference of having two chambers tuned to the same frequency vs having a big one. Thank you. Edoardo Gasparotto

[@WarblesOnALot]

G'day, Yay Team ! That's a weird style of a Printer. I assume that it uses UV-Light to cure a Resin Mixture which is similar to the stuff which comes with the, "BONDIC..., Not A Glue..." Kits, which come out of Kanadia (?). How does it deliver the UV to the precise area of the Tank which the Design requires to become "cured" without setting off the rest of the Juice in the Build-Tank ? Intersecting Lasers...? Warbleswonderz... Such is Life, Have a good one... Stay safe. ;-p Ciao !

[@cruzmorales2237]

Around how much would be a pair of horn for my morel piccolo?

[@manjulwalia1995]

sound great with 3khz horn also with no horn but weird with 1.5khz horn ...

[@The007038]

Kinda crazy this channel turned into 3d printer reviews 😂

[@dwaynehendricks7842]

I guess I didn't quite get this. Did it ever work for original idea? Were the horns you used 3-d printed?

[@dean5485]

just for shits and giggles pop a couple tiny ear pod drivers in that tiny transmission line enclosure and see if its audioable

[@dr.trichome6419]

1.5 is definitely my choice

[@patprop74]

Not to sound negative about Mars, for the price it is very very reasonable. however, I'm rather sure my Formlabs would have no problem printing your cones, in fact, I'm also very sure my homemade true DLP projector printer would be able to pull it off, in life we get what we pay for lol Again for a 300$ printer it does a great job, A little fun fact, the Rook that Elgoo uses as a demo, is almost two times the size of the original SLA torture test rook was back in the days when we were all playing around with the idea of making cheaper SLA printers.

[@susanmathewmathsdbhssp8233]

Hey Hexi any way to measure ts parameters of unknown passive radiator? searched a lot but didnt find any way other than klippel(im broke and use REW) any help will be of great help love from India

[@ZegaracRobert]

1 Use Holm impulse or ARTA, way faster measurements, mora accurate also you can use semi anechoic response in those, waterfall curves to se transient response and ringing al sorts of stuff (Holm gives you h2-h5 harmonics n top of all of that, no need for these slow sweeps and then smoothening no need for those absorbers...it just works better...second, why is your mic 90deg off axes?

[@ricklynch]

You need to add more supports, and cure your parts in water with a UV light on them.

[@cerebralm]

Would you ever do a project video on large homemade full-range monitors for music production? I have made some of my own and am very happy with them, but there are some things I have had to modify because of my limited knowledge of acoustics and driver selection. When friends ask what design I followed, I have nothing to give them :\ There are many DIY speaker videos on youtube but almost none of them are focused on large, near-to-mid field, full-range production monitors, which I feel is a huge gap. A good way for the DIY-focused home studio producer to save money on good, big, sound. (I paid less then $400 CAD for all my parts, and they sound every bit as good as the $1,500 pairs in the music shop. MUCH better then my old Rokit 5s :) )

[@AntonJMiller]

this would be pointless in off axis applications? say in dash?

[@milesprower6641]

i wonder how efficent we can make a speaker horn combo and still get say 150-5kHz range owo

[@hashnannurezaman]

3d printed earbuds?

[@2Eblom]

Most likely a dumb question for someone who understands the science. Is it possible to let the travel go by the width instead of the depth? What I have in mind is a wall mounted speaker.

[@marthabigtime5567]

Thanks Hexibase can you make a design with a 5 or 6 inch driver. The Tang Bang only has 76db efficiency!

[@SuperHddf]

Ey, how about you take one of your huge 3D printers, print acustic diffusion elements and test them? en.wikipedia.org/wiki/Diffusion_(acoustics)

[@edwinhuezo1141]

I like 👌👌👌👌👍👍👍👍👍👏👏👏👏👏👏👏🆒️💯

[@parkerpeter9166]

I wish the design included a 4 or 5 inch driver and I would build one myself, even though it might take a lot of time on my printer. Loud and Clear to HEXIBASE...THREE INCH DRIVERS ARE for iPHONES not humans. Please give us 4 to 6 inches says the lonely woman!!!!!! Help PARTS EXPRESS!

[@jakobpowerflexer]

As a Sound/speaker guy and also a 3D printer geek this gives me a boner that can cut Glass! 😍 Just found your channel and it is pure gold! Pleace make more 3d printet Sound tings. Thanks for the great Work. I Will se all your videos from an end and dont mind my comments, its just to help the algoritmen spread this out. Hope this text was some what readable im danish.

[@treeduck999]

Maybe some acoustic music could better help to evaluate your experiments. Great work anyways.

[@ZoeyR86]

Hey why not build a model car with a working system lol but a scale system all 3d printed

[@MrMen98989]

my head is to small to understand that - these horns are making it louder or clearer or what? i'm sorry but i'm too dumb to understand that. You are my mentor in audio for quite some time, but i'm just not educated as well as You are in audio.

[@iwontlagback7236]

Why is there no like / dislike ration ???

[@iwontlagback7236]

@@HexiBase Oh ok thats weird it doesnt do that to me when i upload something but if its just a glitch then its ok

[@iwontlagback7236]

@@HexiBase btw thanks for anwsering !

[@linandy1]

You would enjoy a Formlabs resin printer. Its much better on every level.

[@dansv1]

Why no human voices or autistic instruments for the demo music?