Subsonic filter - i need educating..

[microhaxo 10+ year member]

So i read my manual of my sub and i remember it saying set subsonic filter to 20hz.. Didnt think anything more of it.

Today i was talking to one of my friends about why it was distorting so bad at 1000w and he said, well what was your sub sonic filter at, and i said 20hz.. He said that sounds low, what is the box ported at, i said 30hz.. he said it should be set at or just above 30hz...

is this true?

And if so what kind of difference would it make in my case? (from 20hz to 30hz)

Click to read more...

 

[teen 10+ year member]

ive always just set mine by ear. most people should be able to get rid of the distortion (caused by the SSF) just by simply playing a song they recognize at a decent volume and adjusting it by ear.

and i believe ive heard the same, set it just over where your box is tuned. i still set mine by ear, and im not sure how that coincides with how my box is tuned.

 

[bonesninja 5,000+ posts]

should be set for 1/2 an octave below your enclosure tuning

 

[microhaxo 10+ year member]

Do you guys think this might account for why i thought my sub sounded so bad at the 780 true watts?

I set it to ~ 26hz

 

[bonesninja 5,000+ posts]

Do you guys think this might account for why i thought my sub sounded so bad at the 780 true watts?
I set it to ~ 26hz

no....i suspect clipping

 

[teen 10+ year member]

not sure. play around with it and see if it sounds any better.

 

[Insupasmomsom01]

Do you guys think this might account for why i thought my sub sounded so bad at the 780 true watts?
I set it to ~ 26hz

no, it really doesn't make a huge difference, although you can tell whether it is on or off.

 

[microhaxo 10+ year member]

Hmm, i think it was clipping too..

I bought a powerful amp that i know does 1600w at 1 ohm rms.

I just wanted to get it to 1000w..

Why was i having trouble getting it to reach 1000w?

My battery doesn't drop below 13v on bass hits

i have a 130a alternator

and big 3 in 4 ga

4ga wire about 13ft

It never has went over 60amps on the line though (current AGU fuse on 4ga wire) Even when i had it at like 780w with gain way high. Waiting for 100a to arrive monday.

Also in the post above i just set it to ~26hz.. Before it was at 20hz

I do notice a small difference in the way the bass hits the lows. Might be "placebo" but i think its more controlled.

 

[bonesninja 5,000+ posts]

what amp and what sub?

 

[microhaxo 10+ year member]

Hifonics 1606d

Phoenix Gold RSDC 12" 2 ohm

 

[Enellz 10+ year member]

I got mine around 80, 20hz is too low.

 

[bonesninja 5,000+ posts]

I got mine around 80, 20hz is too low.

ummm yeahhhh

 

[bonesninja 5,000+ posts]

Hifonics 1606dPhoenix Gold RSDC 12" 2 ohm

could be your box too....probably the MOST overlooked part of the system. Bad design or build will make a nice amp/sub combo sound like doodoo

 

[microhaxo 10+ year member]

Well my box is custom built. Sounds GREAT at 510w rms but trying to push above that (my attempt at 780w at 59v with 19amps of current from sub) and it sounds like dumptrucks driving through a nitroglycerin plant.

box specs

2.5 cubes ported at 30hz

Might throw this in the cocktail...

my lights dim at 510w rms (its set at 40v ac from the amp but after factoring in amperage its 510w true rms.) 18 amps x 40 ac volts = 720 * .707 = ~510w

 

[bonesninja 5,000+ posts]

Well my box is custom built. Sounds GREAT at 510w rms but trying to push above that (my attempt at 780w at 59v with 19amps of current from sub) and it sounds like dumptrucks driving through a nitroglycerin plant.
box specs

2.5 cubes ported at 30hz

Might throw this in the cocktail...

my lights dim at 510w rms (its set at 40v ac from the amp but after factoring in amperage its 510w true rms.) 18 amps x 40 ac volts = 720 * .707 = ~510w

box too big??? i have no idea, i've never heard an RSD before nor do i know anything about them