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Help to upgrade my diy subwofers
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Old 12th June 2019, 08:27 AM   #11
TONI G is offline TONI G  Spain
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Join Date: Feb 2019
Location: Mallorca
Quote:
Originally Posted by norman bates View Post
I don't know of a 12" with sealed qtc .707 near 30hz.

15" rss390hf, qtc .707 sealed = 5.5ft3 with f3 near 32hz

18" um18-22, qtc .707 sealed = 9ft with f3 near 26hz, but qtc .9 makes 4.5ft3 for f3 also near 32hz, but stuffing can pull it a squeek lower.

Thank you very much for the information. My intention is to take advantage of the boxes so subs of 15 "or 18" are not an option for me.


BR


Toni
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Old 12th June 2019, 08:36 AM   #12
TONI G is offline TONI G  Spain
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Join Date: Feb 2019
Location: Mallorca
Thank you very much everyone for the opinions. From what I see it seems quite complicated to have a sub of 12 "reproduce the lower frequencies without the reinforcement of a bass reflex. By the way, the room measures about 28 m2

I will try to locate the subs in other positions and see if the sound improves.


I will report the results.


BR


Toni
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Old 12th June 2019, 09:20 AM   #13
TBTL is offline TBTL  Germany
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Join Date: Oct 2013
Quote:
Originally Posted by daanve View Post
Your 87 liter simulates an Fb of ~ 30 Hz with a 0.6 system Q.
With room gain and good placement you will have excellent bass without the need for equalization.
Unless you listen outdoors, the system must be equalized anyway to account for the effect of room modes.
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Old 12th June 2019, 03:53 PM   #14
norman bates is offline norman bates  United States
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Location: iowa
Ah.

And scanspeak are very expensive over here.

But that is very good f3 sealed for a 12".
I look at f3 not fsb.
A q of .707 is low as you get (f3) but a .9 with stuffing gets close and isn't huge sized with big drivers.

You are welcome.
I must remember to read closer what people are asking.

Last edited by norman bates; 12th June 2019 at 03:55 PM.
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