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

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!

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

Really good advice bro, thanks for sharing!

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 :)

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

The title itself is a winner to me.

How accurate is bassbox Pro frequency when you’re designing a box? Is it really 5hz of or is it spot on ?

What's your opinion on a 4th order box for a 12" zv6? I want to do a center console build for my GMC Sierra, and I saw a really nice 4th order someone designed on the sundown Facebook group, but doesn't mean it's good sounding. I can easily build just about anything, but designing is a harder feat when it comes to audio specks. I usually just build a ported based on the recommendation from the manufacturer.

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

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.

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?

Do u help design boxes? For a 6th order huge build?

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.)

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

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

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

Wondering how bass box pro compares to the termpro box program

I am looking to build a 12 inch sub band pass any advice will be appreciated thankx in advance

Do you design boxes.....

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