waldo36

iTrader: (2)

So I've got JL 250amp and JL 10" open air sub that is installed in factory sub spot. These are connected to Kenwood DDX719. What are the best settings for the amp and the sub through the sub settings? I've provide pictures below of current settings.

The highlighted green line is the sub line. The sub is set at 60Hz. The other two are front and rear speaker bass lines. The front is currently set at 180Hz, and rears are at 80Hz. The front speakers are Polk DXi 650s, and factory rears.


And the amp is set at basically 90Hz.

beezee

iTrader: (19)

Audio settings is always a tough game. I ended up using a clean sweep calibration disc. Made things easier. Just keep experimenting

waldo36

iTrader: (2)

Ight. I've only adjusted from the stereo options, and had a buddy that adjusted the amp to 90Hz. He also said that there is certain Hz that if the sub is played at too long will seize it up fairly quick. I want say I think it is 60Hz? Can anyone confirm this?

johnx818

iTrader: (2)

Wrong. Subs are meant to play 20hz and upwards of about ~120hz, but in most cases are only tuned to roll off at about 80hz.

waldo36

iTrader: (2)

So where do I need to adjust the amp? Do I need to match the Hz on the amp to what I have adjusted it to on the settings on the stereo? So I can leave my settings on the stereo at 60Hz?

On a side note, I love this setup. The open air sub keeps the bass very contained (perfect oxymoron). As in, I can turn it up pretty loud and not be disturbing other cars around me when I'm waiting at a red light.

johnx818

iTrader: (2)

Your 60hz setting on your Kenwood deck defeats the 90hz setting on your amplifier. If you'd like some leeway to play with frequencies on the fly, you would want to set your LPF on your amp all the way up, and play with the LPF on your Kenwood deck. I'm not too experienced with free-air subs, so I dont' know what a good LPF would be. But, if you're already playing it at 60hz LPF and it sounds good, just leave it. Also, your system isn't getting its full range of frequencies because of your HPF, it's way too high for aftermarket 6.5s.

I can go in-depth with HPF and LPF if you'd like. It helps to understand it a bit more to make it easier for you to fine-tune your system to your ear.

rebelscum

This isn't ENTIRELY true... It augments it. If both crossovers have a roll off of 24 db per octave, then it would start rolling it off at 24 db per octave at 60 Hz and 48 db per octave at 90 Hz for example... They both affect it , but set at differnt frequencies there will be 2 cutoff points and the higher one will have a compounded effect...

beezee

iTrader: (19)

Exactly what I said from the start. Can be confusing. Just play around with it to get the sound you want