Stop Asking For Audio Advice On The Internet (4th order design)

Detailed breakdown of why you cant trust the recommendations of others on the internet. Video specifically focuses on 4th order design, what's important, and why you need software to do it right. As always I'm open to any and all comments, criticism, concerns. It's been a learning experience to get to the point where I felt comfortable enough to make a video on the subject. The journey of knowledge never ends, so sorry in advance if some of the information presented is inaccurate. Enjoy the video.

[TediumGenius]

Being a new BB6 user and never having had anything larger than 10's I have questions, but with this approach you've shown the trade offs and options available for these larger subs and a lot will apply to other sizes. It was a good tour of features also. Nice work!

[CrystalClearSQL]

Brilliant. Thank you for taking the time to compare so many different subwoofers... I really appreciate it. Great video, for sure helpful.

[buckboxdesigns]

I tend to look at Qtc & Fsc (of any woofer in a sealed box) to determine if a woofer will work or not and size of sealed section(s), depending on overall goals. Biggest mistakes I see with 4th order BP's are too much ported side airspace & port area and not enough sealed airspace. 4th BP's are fundamentally a sealed box; proper sealed volume is most important. The ported side is just a boost to the dynamic of the sealed side, so choose where in the bandwidth of the sealed you want to boost it, and how much. The Fc/Fsc/Frc of a 4th is relative to ported tuning, but if you have a woofer in sealed that has a low Hz Fsc, then if you tune to that, then the whole response will be low. Sometimes you need to tune the ported side a little higher if the sealed side is resonating relatively low to boost higher frequencies. All of it depends on what your goals are. Don't calculate airspace or port area by ratios, but go by how much the woofer can effectively use. EBP is important, but Qtc and Fsc are more important, IMO, when it comes to actual usability of a woofer. Good video, I like the detail. I'd like to see one on parallel and series 6th order BP's :)

[mikelmartin]

I totally agree, there is no one perfect ratio or size it is totally driver dependant. Right now I am looking at a 4th order for my MTX 7512-44 that is currently in a sealed 1.4. I modeled a 1.5 1:1 and out of curiosity I modeled one of my kicker compR 12's and ....utter garbage response.

[BassRanger]

Really good advice bro, thanks for sharing!

[scottouimet]

Where did you go, we need you to explain more lol. J/k this video helped me immensely so far. Thanks

[bosshawg]

Bassbox is my favorite but also somewhat of a hindrance with box creativity. A few assumptions will stump you because you aren't confirming data of the environment or drivers, which can vary wildly from stated specs. This can make the "perfect" Q not as ideal as you would think. Many great designs had a Q much higher than you think due to cabin gain.

Also, some high EBP drivers in sealed boxes tend to play very naturally in the vehicle and down to frequencies much lower than on paper sans cabin gain. Dayton HO, old-school Solobarics, the list goes on. Conversely, subs with a seemingly perfect Q and EBP can often sound boomy and wind up with less extension because of playing too flat below where the sub should actually dovetail with the car. Of course, this is somewhat subjective depending on the objective of response. Still, many get this wrong.

My suggestion is to take more measurements.. cabin gain is NOT an art. It is pure science and must be measured... not assumed as BB6 applies. How you implement it may be an art. Many still get it wrong in their objective

[carolsmaple]

Does anyone remember the Orion Car Audio? The single reflex and/or dual reflex subwoofer design enclosures from the early 90’s?

[bradvanvalkenburg]

Great discussion, I’d like to see you and Daniel “Boy Genius” Sailor have this discussion 😊

[michaelrobinson]

People on the internet - "I don't trust professionals because of... reasons, so I'm here asking random strangers for important help on a problem I won't fully explain"

[littlejln]

Trying to do a 4th order for an alpine type x.

[DibeezyTheGifted]

Zv5's are some of the best 4th order subs made

[SbassLaser]

Interesting at 10:10 that you say the U series is bad for sealed and Z series is good, because sundown says the opposite. Are there other factors that could make that rule untrue?

[hopskustomaudio]

I obviously need to get bass box pro. Built my 1st 4th order last year for 6 15s in a wall. My own design. Have been wondering if I could do anything to make it better. So thanks for the video. My subs have a high qts at like 1.1. Some people say it's bad and others say it's good. I love they way they play but what does a high qts like that hurt or help?

[Drunken_Hamster]

What side of the EBP scale should someone consider for an infinite baffle sub? What about an IB bandpass like I proposed in my other comment? (basically a reg 4th order bandpass, but with the sealed side being 4x-10x or more of VAS.)

[jessicaembers]

The best solution for the 4th order band pass, is to build a 6th order band pass! :-)

[charlesphillips]

Wish hdc 3 12s sound quebed would work in a 4th

[Resurrectionaudio]

Wondering how bass box pro compares to the termpro box program

[germainalvarez]

Hey bro I got 6 resilient sounds team 18 I want to know if they can sound really good in a 4th order bandpass box

[cdshawn]

Man on Facebook I just want to tell them people just pay somebody, or read a book😂😂