I've been designing transmission lines for nearly 40 years. People who say t-lines are too big, and that they're a waste of time, obviously don't know how to design them properly, and they don't state the truth, that there is no one box, that is optimum in every situation, for every subwoofer, in every listening environment and for everyone's listening preference ... period!

News to me. All of my bandpass builds are just a waste of time and space 🤯

Even in the spl world, there are bandpass boxes that win year after year in there class, so bandpass boxes must have there place

Thanks Robot for sharing, the JL info I will have to check that out.

👍thanks for always teaching us about the business ins and outs

This is a good message some people don't understand

JL has putting out some fantastic online training seminars. Been watching you and them every chance I get trying to soak up some knowledge and learn something lol. Keep em comming!

You really don't know how cool you are man thanks for all the information you give

EXTRA LARGE sealed box is the way to go for hifi subs! Amazing low end even from a cheap sub, with a nice gradual slope going up. My 12 inch in my car sounds like a low excursion live performance stage subwoofer. Although, it’s not very loud at 400-900 watts. It just sounds super deep. Gets loud the lower the song.

Don Keele compared a variety of enclosures using the same JBL pro woofer (in a project for JBL) and modeled the amount of output and bass extension obtained vs the size of the enclosure. He used some kind of scoring system that considered both output and octaves of extension relative to the "worst of the worst". In his analysis, he found that a bass-reflex enclosure provided the most output/extension for a given air volume with a given speaker. This was mainly relevant to pro audio, as JBL was working on the VerTec array in those days, but it's an interesting finding and I would be interested to see how it bears out with other drivers.

Keep these vids coming 👌🏻 also you should do comedy ur hilarious 👍🏻

What's it's like to know literally NOTHING about enclosures?

I’m so glad I found this video. I’ve been wanting to build a bandpass enclosure but the modeling software showed that it was never a good idea (in my case, which is listening to actual music and not sine waves). Thanks for the content.

Back in the day 90’s I was a teen. I liked band passes cause you get “bass” from low/any amount of power. Luckily I learned that band passes covered up distortion and then you’d blow the speaker(s) them your SOL. so I was able to convince a few buddy’s early on to just go sealed. I still liked sealed but I made a box just out of my head it fit in my trunk just right and just by dumb luck the box tune was at 25hz and that is what I wanted since I paid my sub builder to make subs for that range. I ran my measurements thru a box builder online and it actually came to 25hz. I then had an actual box builder make me a box for my newer subs he tuned the port to 32hz and I really don’t much care for that tunning so I’m going to make that same box again I had solo X 18 motors on/in and put my new Adire Kalis 15’s that are better made for lows than solo X 18 motors.... I think 🤔🔊🔊. Box is just as important as the sub/driver/woofer

I was just looking at that rf calculator last Friday

Bandpass box is more efficient then a ported box, but it is VERY hard to design a bandpass box that sounds good. It is better to simply make a ported or sealed and save the headaches. There is also the advantage of being able to play deeper base without added power. Using low frequency cutoff on the sub, allows it to play louder while the ports in the bandpass add the low frequency extension. Doing that in a sealed box, or even ported box, takes a lot of power, and is a lot harder on the subwoofer itself.

I'm still a fan of sealed enclosures but have owned many ported boxes but I am going sealed in my next build. You got any unique 12in frames you would build looking for something not many have.

Fantastic breakdown

Wow, thank you for the confirmation of information. I need to re-purchase the Loudspeaker Cookbook as well ( had it in 1993) and used it to build my first set of ported 15inch subwoofers to piss off the neighbors in my studio apartment. LOL

More videos like this one please

Phase attenuation and slopes aren't "worse". If your using the speaker in it's bandwidth and group delay is low there is NO ISSUES.

I feel like that you are generalizing here... Bandpass boxes are optimal for when you dont have fold down seats. Since I started getting experience building series tuned bandpass boxes I never went back to vented. In my particular application the gain is tremendous since all output is vented through the skipass with no trunk rattle. Problem with bandpass boxes is you need to model it with proper software... Hornresp or Akabak. Models that can take into account box geometry, effects port area and loading and their effect on tuning (since they do not act mutually exclusively) as well as large-signal woofer effects... Make REs or Torres Box calculator look quite rudimentary, and while stuff like WinISD or Bassbox Pro is better its still not sufficient to model appropriately . I'm not a fan of 4th orders but series tuned 6th orders are amazing for install flexibility since all output is coming out of a port and the fact you can tune the passband on both sides where with a vented box you are essentially stuck with a single gain shelf before it rolls off.

What's your thoughts on a paraflex design in car vs home/concert? Or input in general on these cabinets?

oh shit im hella early lol ..and ive already been binge watching!

I've built many boxes with that RE calculator

How about horns? A front loaded horns is a BP4. A hybrid horn with a ported rear chamber is a BP6. In order to sound good and save the driver from over excursion, you need to high pass and low pass filter right about the pass band of the box. Bandpass box is a trade off, wide frequency or narrow with efficiency. I use hornresp to simulate freq response. I made a lot of BP4 and BP6. They play flat really well within the pass band. The problem with those are the group delay

I like the Old Kove Armageddons U2’s had a pair of 18’s wish I neve sold them.

The most frustrating thing for me is when people bring me 2 12’s and want to put them under the seat of an extended cab pickup ( or some other ridiculous waste of space and speaker). I’m a mechanic/body man now but I used to put in several systems a week.

I really like the channel bro good stuff! What are your opinions on the "paraflex" enclosure?

Hey trying to look online for the recommended enclosure for a tc sounds lms ultra 18 and audio pulse 15inch revo. The same information you showed in the video from tc sounds

hey I want 10 or 12 with a350 budget I wanted some sounds and got a dam bandpass box an have bought shutty prefab. and box makers charge what they charge because it's custom any recommendations please. it's ok what I have but want to experience these ported boxes I been seeing and hearing. the bandpass box I have is sound ordinance. I have a decent amp to push what ever

Hey man how can I get in contact with you, I have some 12s I want to get modified and I have some questions also

Im gonna put two subs in sealed box with qts 0.8. But what about calculations fs/qes? In that way they would be better sealed than ported

damn that means hexibase must be wrong and so is my dd608 ina 6th playing 22-58hz +-1.2db doing 139.8db @25hz and 138.7@45hz (note my front stage crosses over at 40hz) using a bandpass box is the best way to get a wide bandwidth out of small drivers the only sub i have seen that doesnt need one is a jl w7 8 in a large low tuned ported box that plays flat from 22 and up. "ported and sealed is all you need" "anything you can do in a bandpass box you can do with a ported box" HAHAHA just no. you can get the same bandwidth out of a sealed box but you will loose so much output (although being smaller) compared to a 6th. every enclosure has its place. from what you have said that means everyone with 4th or 6th order wall builds should have just done a flat wall lol clown thought you would have atleast looked in winisd or bassboxpro like jeez.

Here I am impressed by great bass in a sealed enclosure 😆🤣

Infinite baffle master race

I done a 28 hz - 56 hz running on a 6th order on a sx 18 at one point didn’t play bad wasn’t like what it was in a 4th

I'll assume you're a vendor? Anywhere i can see the inventory you have?

The only thing you missed was telling kids to get off your lawn.

not only the loudest SPL cars on the planet use bandpass, but also the loudest daily music cars, i would delete the video if i were u lol

Holy shit .159 Qts that was a strong motor i wonder what the BL ^2/RE was .

what are your thoughts on DC audio?

If you're gonna make a bandpass box, it should be a tapped horn

All I do is listen to Tony Robbins lmaoooooo

I just try to go with whatever sounds when making a slot port box, I always play around with my port depth until I find what sounds good.. a inch or two does make a big difference... dont always trust box caculators.. I trust my ears..

Want to know how bandpass really works? Shoot me a line. Both a 4th order bandpass and vented are 4th order acoustic alignments. Also the cabin acts like a acoustic alignment aka you are bandpassing the alignment by rolling the windows down

Need help to fine recons for 4 AQHDC3 12" dual 1ohm

I run 18 dB slope on my sub and 12 on my mids right now

Unless your setting world record spl numbers. I'm sure Alan Dante uses a flat wall to achieve 185db lol.

I'm not trying to get mean but you don't understand this enought to make a video. Not one rockford car nor sealed box has a world record. When you get 2 18s sealed to do 158 cone let me know. I'm not getting into this right now but I'll be glad to link articles for people to understand acoustic alignments. Simply put the act like crossovers but acoustically. The port IS another driver. The air mass inside the port US the diaphram

Only reason to go bandpass 1)Novelty/doing something different 2) One note SPL boxes for competition. Everybody should build one just to say they did. For extreme SPL experimenting with the driver in the car is more important.

what's the link to that website?

Butterworth

Agree and Disagree on this Topic. If you are looking for Just musical yes Ported and Sealed are the Way to go but for Competition nothing Beats Bandpass either 4th or 6th. im working on a 6th order design for a specific type of music using a Decent tc sounds 15" old school sub. let see how it plays later.

Love this and all you do... F-em. I want two sealed 18s in the back seat area of my 92 Cadillac DeVille. Thank you for being you Love your attitude.

The re box calculator is incorrect.

So a ported enclosure will give me the same output as my 6th order?

Enjoy your content...I bet in 35 years I've build 20 band pass boxes...out of the 10 thousand boxes I've built....IMO in bandpass you trying to over think your box....90% of what I do is ported...program I use is from like 92...its just to do the math.....

😂😂😂 this is ridiculous. As a bunch of people have already said, all of the loudest boxes with the larges bandwidth at all of the shows are 4th and 6th order enclosures. In order to make a ported enclosure that loud, you have to make it crazy peaky. It's only gonna play one note. But a bandpass box can be that loud and still have bandwidth. Just because you dont like sound competition, doesnt make it pointless or a waste of time and money. If that's the case, you have to say that about ALL hobbies. You are very much generalizing something that is extremely situation and application dependent.

Another great vid Brother.

You are grossly simplifying acoustics. Typical car audio guy! You’re standing on a soap box spitting gross inaccuracies. 18” sub in a 3 cube box? Why? If you’re building an spl box tuned super high, I agree but if you’re hoping to hit 20hz. Good luck.

Thank you 4th order it's not...call it what it is lol

I used to be a JL fanboy, until you appeared...

FUCKING LOVE THE EPICENTER COMMENT. The brand is good and it had a purpose at a time when even Rap music didn't hit lows. Not like today with many artist making tracks in the sub bass range or just grab some Jeezy. Back then that wasn't really a thing. We are talking EARLY 90's. Eazy E Eazy Duz It Kid Rock Grits Sandwiches for Breakfast, NWA Straight Outta Compton, bout the only thing that might hit was Miami Bass, 2 Live Crew As Nasty As they Wanna Be. Yeah yeah I'm showing my age

This is also the same guy who thinks 14 is old enough for a kid to consent so I wouldn’t take this very seriously lol

Plenty of people out there doing 60s over wide ranges with incredibly flat response.

Honestly, who cares about bandpass. I'm interested in learning about the physical characteristics of the universe. How do I learn about that lol

I dont why people be hating on sealed boxes ,if they are built right theyll sound great.. they can punch hard and have decent lows if done correctly.. again trial and error experiments is what it's all about to be able to find what sounds good

So the bandwidth of a properly tuned 6th is garbage compared to a regular ported or sealed box? Sounds like you need some education yourself🤷‍♂️🤦‍♂️

hilarious, you literally know nothing about how enclosures work