Hey guys, quick question about "tuning" my sub amp.
The low pass filter has 50-200hz, and my sub specs says it will do 25-250..
Does that mean I should just set it at 200?

Also, Input sensitivity, I just set to the voltage of the input right? (in this case 2.5v)
Aaand.. bass boost, A no-no unless I really feel I need it, right?

Thanks guys

really depends on the internal volume of your sub box
once you know that then you'll be able to set the herts once comparing it to the sub

really depends on the internal volume of your sub box
once you know that then you'll be able to set the herts once comparing it to the sub
Alright =\ I'm not sure what it is actually, it's one of Bigs's molded ones if that helps, I'll try and see if he included the volume in his thread.

I'm pretty sure it was fairly close to the recommended size by Hertz, which is 20L for a sealed box.. Underneath that, it says Fc = 56Hz. I don't know what it means, but it has something to do with this right?

The low pass filter sets the cut off point for the sub. So say you set it at 100Hz, then it will only play frequencies below 100Hz and ignore everything else above.

A common starting point for subs is about 80Hz. Then slowly play around with it till it sounds nice to you. 80-100Hz would be a good guide.

At 250Hz you are going to start getting a lot of other frequencies played which will interfere with the deep notes. Just because the specs say it can play that high doesn't mean it has to.

What front speakers have you got? If they are decent ones they will be able to play down to 80Hz without too much hassle. You will need to play around with the cut off points for both to make sure they seamlessly play together without missing any frequencies.

Frequency response on my splits is down to 60, but I'll just start with 80, and see where it goes from there.
Thanks mate, any help on the bass boost and Sensitivity?

Thanks mate, any help on the bass boost and Sensitivity?
Bass boost I try not to use myself, kinda like having Xplod mode turned on on a sony headunit, doesn't help anything. If the sensitivity you mention is the gain, then you need to turn it all the way down, turn the stereo up to around 3/4 then turn the gain up till the sub distorts then back a bit. Thats the simplest way of tuning that, and you can then adjust it down accordingly if there's too much bass at that level for you.

Bass boost I try not to use myself, kinda like having Xplod mode turned on on a sony headunit, doesn't help anything.

Yep agree. Leave bass boost alone.

[QUOTE=Lugo] If the sensitivity you mention is the gain, then you need to turn it all the way down, turn the stereo up to around 3/4 then turn the gain up till the sub distorts then back a bit. Thats the simplest way of tuning that, and you can then adjust it down accordingly if there's too much bass at that level for you.

The reason you only go to 3/4 of the head units volume, is quite a few of the entry to mid range headunits internal amps distort quite badly at full volume. Just a warning though, if you d ot this way, never turn your head unit up full or you risk damaging your sub. This is basically setting the max level that your sub can be played at so you don't risk blowing it.
As Lugo said though, if the bass is too loud you can always turn the gain down a bit :)

As above to tune the gains.

Bass boost off.

LP filter on the steepest curve possible - i.e. 12db / oct preferably 24db / oct

Start at 100Hz and work your way down so that the sub blends in with the fronts. You will probably end up around the 70-80Hz mark. Don't be afraid to change the phase either.