How to Wreck a Subwoofer Enclosure

[@Hardwareasylum]

Do you know what is really great about this video?? It shows that the KZbin algorithm is still fundamentally broken. Not only did this video not get any views when I launched it over a year ago but, it continues to get views from some of the strangest cats on the interwebs. Keep the comments and views coming!, not only are they fun to read but, even if you misinterpet the subject matter it helps promote the channel and this video. Its almost like the haters out there don't know that to bury something on KZbin you have to, like, NOT engage.

[@ShannonpdpHammond-yy7yh]

Keeping the video alive!

[@Hardwareasylum]

😁

[@georgeogrady449]

Different speakers on watts and size

[@georgeogrady449]

80 hz build speaker amplifier 200 hz is crossover 19" rack

[@Hardwareasylum]

Wow.. you are all over the board this this reply. First talking about a 19" rack (which would be nice depending on the girl) and then talk about 5000 watts which seems excessive for a 5" Tang Band subwoofer but, I am going to play along. and then you disappoint me with your admittance than you use a 2-way crossover. I mean, seriously, are you mental?? 2-way crossovers are so last week. It is almost like you are a bot that has gotten confused, thinking these are car subwoofers and not a low powered speaker system for a Computer. Or, you are drunk and need to take a break from the internet. Either way, I thank you for your comment (well three of them) cause they really help out in getting this video promoted to the masses of armchair audio enthusiasts.

[@georgeogrady449]

Crossover network 2 way that can be any thing 2000 watts new speaker in different country way over 4000 or 5000 watts speaker

[@nagyandras8857]

what the quack.... no, an isobaric does NOT have to have a bump.

[@Hardwareasylum]

It will depending on how the box is tuned. The process isn't magical, they are just two drivers coupled together to change the moving mass, everything else remains the same.

[@nagyandras8857]

​@@Hardwareasylum basicly the compound of the 2 drivers in simple terms is identical to a single dirver, but you can halve Vas. a bit more advanced model accounts for the air that couples them. that has mass, so its modelled as added mass to the Mms. For that reason you get slightly less Fs. depending on configuration. as the clamshell kind you show has the least air between the drivers, its space efficient and nothing more. but isobaric is very very usefull, i do prefer to build subwoofers (note, not bass boxes, but subwoofers.) using drivers in isobaric configuration. drivers do not respons 100% equal to a positive and a negative input. meaning the cone moving towards the magnet behaves different than moving away from it. allso the driver has a basket, magnet, spider, etc.. those make noise as air passes them. given this, i prefer to have 2 drivers magnet-to-magnet. the coupling chamber volume is slightly larger, the fs is affected specialy whit larger drivers. like 10"+ size. less noise whitin a ported box, the less that can get unintentionally amplified by the port it self. since the port it self in a transmission line. it has a fundamental freqvency and its harmonics. if the noise in the box corresponds to one of the constructive harmonics of the port, you get those subs that sound "bright" no mather what you do to them. thisway i can avoid all that. peak spl remains the same as if i only had 1 driver. many cases the box it self ain't mutch smaller than just having both drivers as twins. since the coupling chamber can take up quite some space. and for that same peak spl it needs 2 times the power input vs a single driver. so its not as efficient.(in terms of dBL at 1m driven whit 1 watt, but depending in coil configuration dBL at 1m drivern whit 1V will be vastly different story , makes a difference is they are series or parallel wired) but the quality does improve in many aspects. and it gets a bit worse when it comes to how tight the sound will be. we got twice the motor force, for the same area. but we got twice the mass to move, and a bit more due to the coupling chamber's airmass. but its a worthy tradeoff. So basicly Qts remains the same Fs equal or less depending on chamber volume Motor force will be twice Mms will be twice + some, depending on coupling chamber Vas will be halved actualy i do currently plan a speaker whit 4 midbass drivers, that is 2 isobaric pairs. drivers connected in series+parallel. thatway electrically its near identical to a single driver. the required nett volume is allso the same. in exchange i get way more powerhandling, less excursion for the same spl, and a more linear "compound" driver. it will be an MTM setup.

[@Hardwareasylum]

Thanks for the mansplaision of Iso loading. I'm sure someone will find it helpful. My $0.02 on MTM loading, I've never been a fan of that design. In my experience, and based on your description, the output is softer and muddy due to the loose coupling of the drivers. This is often due to the sealed air being compressed and causing the drivers to be slightly out of sync. It works, but I have found the clam shell loading to be considerably more accurate. But, build what you like.

[@nagyandras8857]

​@@Hardwareasylum dynamics of an isobar is less than a single driver , its not the loosy coupling , but the added mass it self. On the other side , higher freqvency distortion , say past 1khz will be more controlled and smooth it self out. Would be hard to find drivers whit exactly the same artifacts in transfer , so they smooth eatch other out. Mtm stands for having a midbass , a tweeter , and a nother midbass. The supposed advantage comes from the phantom image of the 2 midbasses being where the center of the tweeter is. Or at least very close to it. Thatway is approximates a single point source more accurately. Helps whit imaging. Back to isobaric. It did help me whin a few thropies and prises. Allowd me to enter car audio competition whit p.a. drivers. The amplifier was given , so had to make the best use of power. Unarguably the tipical car sub barely manages 84 dbl / watt at 1m efficiency. The pa drivers i used went from 93.... 90 accounting for the loss via isobaric load. However i do have some wins where i managed to do both the raw spl , and sound quality throphy whit the very same setup. Can call it trolling.... but it was realy fun.

[@andyevans2336]

Oh, good for you!

[@christopherstorrier5560]

An Isobarak speaker has no ports...it is 2 speakers ,1 mounted on baffle the other mounted a calculated distance behind the baffle drive unit with a sealed volume of air between both forward facing drive units, one behind the other...can not port an Isobarak...an Isobarak speaker has another identical speaker facing forward behind the baffle mounted bass driver, trapped sealed air between the 2 drive units...look up Isobarak...this is just ported or reflex ported not Isobarak, Linn made Isobarak speakers,very expensive, real Isobarak speakers, gives deeper ,faster ,less distorted bass response.. If done properly like Linn the bass is unbeleivably extended,fast & less distortion than a single non Isobarak ported bass cabinet....

[@Hardwareasylum]

Thanks for your comment and watching the ENTIRE video. :) Isobaric loading describes how the speakers a coupled, They can be front to back, back to back, front to front and back to front. The only thing that distinguishes them is the sealed air chamber between them. Beyond this they can be vented, and many often are. Porting vs Sealed is determined by the speaker parameters, some work best in a ported enclosure, others, like the Linn speakers you mentioned prefer a sealed enclosure. I believe what you are getting confused is a brand name from Linn "Isobarak" VS. an actual speaker loading design. Here is another video from a channel that has been doing rather well in the speaker realm to explain. kzbin.info/www/bejne/eJWpaKGKisSEhbM

[@christopherstorrier5560]

@@Hardwareasylum ....yes isobarak is a bass loading system, Linn called it the "Linn Isobarak" speaker which is what most people think of when the word isobarak is mentioned...we call that 'Clam Shell' in the UK...not strictly what the hi-fi world means when they talk about Isobarak..though it has been done... technically your right it is isobarak, the coupling of 2 bass units with trapped air between them...some bass players use clam shell loaded sub bass cabs, yes they are a ported Isobarak style & produce a lot of low end subsonic bass under 20hz..a bit to much but they are fast for the size of 2 x15" bass drive units....if you want the most musical sounding Isobarak bass my experience tells me the both firing forward, one on the baffle & one a calculated distance directly behind, sounds fantastic if done right...i used to design speakers but never got round to Isobarak loading as you need 4 high quality drive units with the right Thielle Small parameters & very little written back then about isobarak bass loading, no internet...yes i have seen ported clam shell isobarak speakers... imo transmission line subs are superior, fantastic just like transmission line speakers, PMC etc... the transmission line produces an amazingingly clean deep bass with a lot less distortion but can't go as low as an isobarak bass loading system ...if i could afford everything i would design a stand mount sized tranmission line 2-way speaker with a transmission line sub in a seperate enclosure underneath, if it's purely bass amount isobarak clam shell is the way to go... for hifi quality tranmission line loaded is my preferred option, depends on what your trying to acheive ,but hard to buy the right bass units...good luck

[@jamegumb7298]

@@christopherstorrier5560 _the most musical sounding Isobarak bass my experience tells me the both firing forward, one on the baffle & one a calculated distance directly behind, sounds fantastic if done right_ That is my latest design. I want it as compact as possible, so 2 drivers front to back, but doing it twice and stacking them. Cheap enough drivers but will be an interesting experiment. I ordered 5 so I can compare it to 1 driver in a normal box.

[@christopherstorrier5560]

@@jamegumb7298 ...great idea, i hope it works for you...before buying drive units i would read up on what kind of Thielle Small parameters of a bass drive unit will give you the best results...dual bass units suitable will cost a few pounds but i can still remember the first time i heard Linn Isobarik speakers bass, it's response & sound, absolutely amazing...i'm not very rich right now so i'm designing a pair of transmission line 3-way speakers....i luv the bass & midrange of transmission line speakers, not easy finding the right drive units with the right Theille Small parameters for a fair price though....good luck with the Isobarics....