[theater_lover]

I feel I have a solid understanding of the benefits of different enclosure types and if given a set volume enclosure how they will effect the output and SPL falloff towards 10Hz.


What I am unclear about is what response is ideal if your goal is accuracy.


What modeled WinISD falloff slope would I want to see if I want to be able to achieve a perceptively flat response? Obviously I may not prefer a flat response once I hear it, but I figure it is good initial target.


Does a typical room gain negate a certain slope falloff? Where would I want the slope to start?


What about human hearing falloff, how does that factor into it?


This all comes down to my wondering if a sealed enclosure's longer, but gradual slope would be the way to go as it will be equalized by room gain and could potentially provide a flatter response to lower Hz (sacrificing SPL), or doing a vented/passive radiator design with a higher SPL, but steeper slope starting at lower frequencies.

 

[brandonnash]

It all depends on your room size and sub placement. The smaller the room, the more gain you will have. You should read steve callas's llt explained over on home theater shack. It should help you understand different enclosures and how they work in your room a bit better and may help you make your final decision. It did for me.

 

[theater_lover]

Got a link?

 

[penngray]

 www.hometheatershack.com


then search for Steve Callas

 

[LTD02]



Quote:
Originally Posted by theater_lover /forum/post/16990131


I feel I have a solid understanding of the benefits of different enclosure types and if given a set volume enclosure how they will effect the output and SPL falloff towards 10Hz.


What I am unclear about is what response is ideal if your goal is accuracy.


What modeled WinISD falloff slope would I want to see if I want to be able to achieve a perceptively flat response? Obviously I may not prefer a flat response once I hear it, but I figure it is good initial target.


Does a typical room gain negate a certain slope falloff? Where would I want the slope to start?


What about human hearing falloff, how does that factor into it?


This all comes down to my wondering if a sealed enclosure's longer, but gradual slope would be the way to go as it will be equalized by room gain and could potentially provide a flatter response to lower Hz (sacrificing SPL), or doing a vented/passive radiator design with a higher SPL, but steeper slope starting at lower frequencies.

in most medium sized home rooms, a 2nd order gain occurs from 25hz down.


bass in music often runs about 10db or more higher than the midrange. this is why thx specs for the mids is 105db at the listening position, while it is 115db from the bass.


most folks like to run their subs a little "hot" +2 to +4db through the bass. this is because the bass to midrange difference increases with declining spl and most folks don't like to listen at reference spl. put another way, the lower the level at which you listen, the more gain you need to put in your sub to keep subjectively the same balance. if you listen at reference level, maybe no boost is required. if you listen at 75db average, aka -10db, you might want +4db in the bass. if you listen at 65db average, aka -20db, you might want +8db in the bass.