Help to find out tuning freq for 2 subs

[Mr Cabinetry 10+ year member]

Yea I know that I need to experiment, but I think that then you know basics you can reach your goal easier. He made 150dB with two Type R's?? //content.invisioncic.com/y282845/emoticons/eek.gif.771b7a90cf45cabdc554ff1121c21c4a.gif

No, he finally achieved that 150 mark with 2 SS -15's.

Yeah, sounds kinda lame that he only did 150 with 2- 15's, but, it took him sometime to get there and alot of trial and error.

Gettin to 150 ain't as easy as led to believe and every system, vehicle and install presents there own set of circumstances.

Who knows, you might break 150 with two 12's with alot of work and effort and alot of patience.

 

[Immacomputer 10+ year member]

So tuning freq will be the same. Understood.
With two subs dB response increase and peak will be at ~44Hz(with one sub at ~33Hz) by WinISD curve.

Ok. Let's say I will play 44Hz tone.

And let's say we have two boxes:

1st. 3cu.ft tuned to 30Hz with TWO subs

2nd. 3cu.ft tuned to 40Hz with ONE sub

So if we play 44Hz tone with 1st and 2nd box, we will get more dB's with 2nd box right? //content.invisioncic.com/y282845/emoticons/confused.gif.e820e0216602db4765798ac39d28caa9.gif

Sorry that I'm asking so much, just trying to understand everything //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

Here is a hint: Read what people have already typed.

Your frequency response in a given enclosure will vary per sub. The tuning frequency is not based on the subs in the enclosure but by the nature of the enclosure itself.

Let me give you an example of something I did.

I used the same sub but different enclosures all tuned relatively close to each other.

Enclosure 1: 3 cubes tuned to 29hz

Enclosure 2: 2.2 cubes tuned to 32hz

Enclosure 3: 1.5 cubes tuned to 30hz.

Enclosure 1 frequency response: Peaked around 30-35hz with a loss in 60hz on up.

Enclosure 2 frequency response: Peaked around 33-40hz with loss from 80hz on up.

Enclosure 3 frequency response: Peaked around 37-45hz with a loss from 30-35 and no noticeable upper frequency extension loss.

Even though the enclosures' tunings were similar, the response was very different between each because of the net volume the sub was seeing.