Cabin gain and generated response curve

[zanekeimigdesigns]

Ive been playing around with win isd pro and reading about cabin gain, but i dont have a way to measure cabin gain so maybe someone with some experience can shed some light. I am building a box going in a crew cab pickup and im ball parking the cabin resonace to be in 55-60hz range maybe higher. How does this effect my box strategy (assuming my cabin gain guess is kind of right). Also should i aim for as flat of a response curve for cleanest sound? And how many db curve is it very noticeable audibly?

[yurvalentine]

Shit, it might be a little late at night to get much of a response but that's some stuff I wouldn't mind learning about.

[Triticum Agricolam]

I'd bet your cabin gain starts a bit higher than 60 Hz, probably more like 70 Hz. You can ROUGHLY approximate cabin gain in WinISD by adding a filter like this:

For your case I'd substitute 70 Hz for where it says 60 Hz.

As far as what kind of frequency response curve you want, its really a matter of personal tastes. Different curves aren't cleaner than others, they are just different. Most people do not like a flat response, especially us basshead types like a rising low end response. I hate boomy, peaky bass, but I do like a gradually rising response of about 3 db from 60 to 30 Hz. That's just me though.

If you really want to dial in what kind of frequency response you like the best thing to do is spend $100 and get a miniDSP or something similar. Then design your box with a bit more low end boost than you think you would like (ie make the box a bit on the bigger side), you can then use the miniDSP to dial down the low end boost until you get what you want. The reason you design the box to have more low end boost than you think you will want it is because its really easy and effective to turn things down with DSP, but its very hard to effectively turn things up.

[Joe X]

Ive been playing around with win isd pro and reading about cabin gain, but i dont have a way to measure cabin gain so maybe someone with some experience can shed some light. I am building a box going in a crew cab pickup and im ball parking the cabin resonace to be in 55-60hz range maybe higher. How does this effect my box strategy (assuming my cabin gain guess is kind of right). Also should i aim for as flat of a response curve for cleanest sound? And how many db curve is it very noticeable audibly?

Flattest cleanest response is likely going to come from a sealed box, to keep things efficient you may want to go with a larger diameter sub which can make up for the lower efficiency of sealed, here is a Sundown SA-12 in a about 0.9 cubic feet box with (an average vehicle) cabin gain applied:

Here's group delay:

From there you can try to EQ out any noticeable peaks you may find.

[Karkov]

I feel like such a noob in threads like these, i basically understand the just of it but then again I really don't...trying to learn but so much is STILL over my head.

[audiolamb6]

gives me a headache most of the time but i know one day ill gett it

[zanekeimigdesigns]

Alright, this is helping me out, how many decibles are we talking about when it starts in getting boomy sounding?

[Triticum Agricolam]

Everybody is going to have a different threshold. Anything above about 5 db and I notice it. Some people can probably tell if there is any at all.

[zanekeimigdesigns]

Alright, with that cabin gain figure it boosts from 60 down alot according the generated curve for many different drivers i have applied. As that what most do is just eq it down?

[Triticum Agricolam]

i think a lot of people just like having that much of a boosted low end. To each their own.