Subsonic filter settings

[hehe]

OK, so I am building am spl box for my IA DR 18", and I am using 3-6" ports, 5 cubes tuned to 45hz.

What would be a safe setting for my ssf to still be able to bump some music?

It's a Diamond D61500.1, and I'm not sure how steep the slope is..

Thanks, Marcus

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[hehe]

Bmp

 

[hehe]

bump

 

[n2audio 5,000+ posts]

I'd set it no lower than 35.

 

[hehe]

Yeah, w/ 3-6" ports I figure it iould unload pretty fast below 45.

Another question. What is the difference between a 0db tone and a -3db..? Is it just quieter by 3db..?

If so, why not just turn the volume down?

 

[hehe]

bmp

 

[shaneb 10+ year member]

Yeah, w/ 3-6" ports I figure it iould unload pretty fast below 45.
Another question. What is the difference between a 0db tone and a -3db..? Is it just quieter by 3db..?

If so, why not just turn the volume down?

It means it was recorded at -3 db.

 

[hehe]

What's the purpose?

 

[Etac 10+ year member]

a sub sonic filter is basically a high pass filter set in the lower octaves.. its mainly used for ported box to help prevent the cone from bottoming out since a ported box below tuning freqency loses its "air suspension"... set it as low as possible

and the purpose of -3db test tones ect.. is because the majority of music isnt recorded at 0db.. infact most is like -6db's