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Old 7th November 2017, 03:20 AM   #1
brad1138 is offline brad1138  United States
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Default Complete noob question

I am toying with the idea of building my own subs for home theater. I am inputting the parameters from various Parts Express Subs into WinISD.

I am most confused about the results I am getting on sealed subs. This is the result from a really well reviewed sub, the Eminence Lab 12C. Reviews say how awesome it is in a 1 cubic ft sealed box...

This is in the optimum size sealed box ~2.5 cubic ft (1 Cft is worse)

Click the image to open in full size.

This is -3 dB at 50 Hz! And -16 dB at 20 Hz... either people have a much different opinion of what a great sub is, or I am missing something....
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Old 7th November 2017, 03:23 AM   #2
brad1138 is offline brad1138  United States
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Secondly, on ported subs. The only one I can find that hits 20Hz, is the Dayton 8" HF, but it only has 9mm XMax, and wants over 2.5 Cft per sub... the 10" and 12" are only hitting 25-30 Hz.

Last edited by brad1138; 7th November 2017 at 03:44 AM.
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Old 7th November 2017, 03:43 AM   #3
DonVK is offline DonVK  Canada
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You already have an amazing system Should I try a DIY sub? . Are you trying to improve it?
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Old 7th November 2017, 03:49 AM   #4
brad1138 is offline brad1138  United States
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Quote:
Originally Posted by DonVK View Post
You already have an amazing system Should I try a DIY sub? . Are you trying to improve it?
Mostly curiosity I guess. My SVS subs are awesome, for the money I want to spend, I doubt I'll be able to improve much, if at all, on them. I am just trying to learn. I may never build one, but I like having the knowledge in case I ever want to.

Last edited by brad1138; 7th November 2017 at 03:56 AM.
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Old 7th November 2017, 03:59 AM   #5
DonVK is offline DonVK  Canada
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OK, fair enough. I use HornResp to model boxes.

The sealed box will start to roll off at 50Hz, but its slope will be gradual (-12db/oct). The ported box will roll off maybe in 30's but will fall much faster than a sealed box. There are many enclosures types and performance tradeoffs. It might be worthwhile investigating the types before selecting one.
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Old 7th November 2017, 08:53 AM   #6
chris661 is offline chris661  United Kingdom
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When it comes to home subs, the thing to remember is this - whatever pretty graphs you make, that won't happen in a domestically-sized room.

For example, one room I worked in had a 10dB spike at 40Hz. The room I'm currently in is something like +15dB at 12Hz. Here, if you get something flat to 20Hz the room gives you almost an octave, pretty much for free.

I'd expect the curve you've shown to work quite well in most living rooms. If not, you can always EQ it.

Chris
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