whats a subsonic filter

[SQcivic 10+ year member]

everyone talks about how jbl amps dont have them, and i was thinkin of getting a jbl so i'm just wondering what they do and if i should get a better amp

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[MTXAudio15 10+ year member]

i was wondering the same

 

[ramos 5,000+ posts]

In laymen's terms //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif A subsonic filter blocks frequencies below the audible range. So your amp doesn't use the extra power trying to reproduce them. It also helps keep your sub from over excursion due to the low frequencies. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[MTXAudio15 10+ year member]

so if i had a jbl 1200.1 pushing 2 12"s in a sealed box would that work cause ive heard you cant use one in a ported box.

 

[more_spl 10+ year member]

no, you NEED a SubsonicFilter if you are going to use a ported box. it damage them subs if you don't, because your box wouldn't be tuned to be THAT low.. dam 20Hz and under !!!//content.invisioncic.com/y282845/emoticons/mad.gif.c18f003ab0ef8a0d9c27ca78d77a6392.gif if you are going sealed, it's not imparative you use one

 

[kithut84 10+ year member]

i've been running my 120 watt 10" from my room on a bp1200.1 for a while now until i get my subs and it has been fine. it is in a 1.4 cf box tuned to 37hz

 

[HX2 10+ year member]

kithut84, What kind of music do u listen to with that box?

 

[MikeofTulsa Moderator]

instead of getting a subsonic filter wouldnt a crossover work? basicly the same thing right?

 

[ramos 5,000+ posts]

Originally posted by Goddyd4me instead of getting a subsonic filter wouldnt a crossover work? basicly the same thing right?

A subsonic filter is a High pass cossover. Most high pass crossovers don't have crossover points at 20hz. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[kithut84 10+ year member]

i listen to all kinds of music on it. rap, rock, techno, bass tests, and it hasn't crapped out on me yet. it is in the back of a cherokee so i can hear distortion and know when to turn it down.

 

[MikeofTulsa Moderator]

i thought they said it was a low pass xover....i thought it cuts out the freq. below 24 or so hz........so it cuts out the sounds above it?

 

[more_spl 10+ year member]

i think a SSF cuts off points below what you set it at... i never thought it would go ABOVE what set it at, that's what a regualr X-over does... and b4 they said SSF's were "reverse x-overs" meaning it cuts below what you set it at.. thats why you want them in ported enclosures

 

[ramos 5,000+ posts]

Okay I think we are all getting a little confused.

A high pass crossover let's frequencies above the cutoff point through.

A low pass crossover let's frequencies below the cutoff point through.

A subsonic filter is a really low high pass crossover. It filters out the sub sonic bass below the cut off point. Depending upon the model it's usually somewhere around 20hz. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[HX2 10+ year member]

How often does music actually go below 20hz. tho?

 

[ramos 5,000+ posts]

Originally posted by HX2 How often does music actually go below 20hz. tho?

Actual music -- not very often //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif Most doesn't even come close.