how do u adjust subsonic filter?

my quantum has a subsonic filter, how do i properly adjust it, just for sound or is their a special way u should do it, also its 1800 watts at 1 ohm with 4 25 amp fuses any guesses as to what it really pushes, cuz it doesnt even come close to making my 2 hp orions peak and they are rated 500 rms and 1000 peak each!

It probably does 800 -1000watts.

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2013 Kia Rio -90a alternator
DDX470HD GTO14001 GTO1014D (x3)
Big3 in 1/0G
1/0G to GTO14001

I can not tell you how to set the subsonic filter, but I can give you a bit of information about it's purpose to help you understand what it does. It is exactly what it says it is. It filters out frequencies that are below audible range. The reason it is there is to stop your amplifier from wasting power on signals that you are not supposed to be able to hear. These lower frequencies (Years Ago when the technology was invented) did waste a lot of power. Using the subsonic filter did allow for cleaner audible sound at higher frequencies because the amp was not producing the low frequency rumble often associated with some earlier recording and playback equipment. The truth about it now is that you can not HEAR these lower frequencies, but you CAN feel them. The subsonic filter is a High Pass crossover. If it is set to 30 Hz. it will attempt to quieten the notes that are below that frequency. So if you have a SUBwoofer in your vehicle, the SUBsonic filter is trying to make it just a woofer. Hope this helps you to better understand how to set your filter.

Your amp has 100 amps worth of fuses mounted to it. All manufacturers fuse the amp at a current higher than they ever expect it to draw under normal use. Usually if fused at 100 the amp will pull 75 amps when maxxed out. So if it is a class D amplifier and you can keep the supply voltage at 13.8, the best you can expect is about 828 watts. Math done at 80% efficiency. That was peak power RMS about 585 watts.

There is real purpose for a subsonic filter that is very important for subwoofers.  If you use a vented system, the driver is mechanically unloaded (meaning it has no resistance to movement from the enclosure) below the tuning frequency.  If it is sent a signal in the unloaded band, it can be damaged from over-excursion.  Setting a subsonic filter at or just below the tuning frequency will help protect the subwoofer from mechanical damage.  Using a subsonic in this way is advisable for any ported or otherwise vented system.

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DYohn] wrote:

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here is real purpose for a subsonic filter that is very important for subwoofers.  If you use a vented system, the driver is mechanically unloaded (meaning it has no resistance to movement from the enclosure) below the tuning frequency.  If it is sent a signal in the unloaded band, it can be damaged from over-excursion.  Setting a subsonic filter at or just below the tuning frequency will help protect the subwoofer from mechanical damage.  Using a subsonic in this way is advisable for any ported or otherwise vented system.

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+1

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nicely explained and yes if your off 1 or 3 hz it wont damage the sub..

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4 12s cvr sealed
2 hifonics bxi608d
1 kinetic hc 800
alpine reciever
infinity kappa door speakers