Reverse low pass filter ?

[girafe06]

Hi all,

I got a new Sony head unit recently and noticed in the settings there is the option to reverse the low pass filter. At first I thought it must just be their name for high pass filter, but then there is a seperate option for hpf. So what does the reverse lpf do? The owners manual is no help. Aslso what would you recommended i set the frequency to?

I have the following options:

Lpf; 80 100 120 140 160 and then normal and reverse lpf. Then the same frequency options on hpf.

I have 2 12 in subs in the trunk, nothing fancy just a 300 Watt system.

Thanks!

Click to read more...

 

[ciaonzo 5,000+ posts]

I think you're talking about the option to reverse the polarity, lol. It's a 0 and 180 degree phase adjustment.

 

[girafe06]

Why would you need to reverse the polarity of lpf?

It is not a separate option, that would reverse polarity for the whole system if thats what u mean. Because it says on the screen "lpf normal" and then if you move the volume knob it changes to "lpf reverse".

 

[bubbagumper6 5,000+ posts]

That is pretty strange...look it up in your manual, it will probably have a better explanation.

 

[Louisiana_CRX 5,000+ posts]

lpf reverse is a term that means off...lpf normal means on ....for the noobs

 

[bubbagumper6 5,000+ posts]

lpf reverse is a term that means off...lpf normal means on ....for the noobs

Why wouldn't they just use "off" and "on"?

 

[Louisiana_CRX 5,000+ posts]

Why wouldn't they just use "off" and "on"?

its a Sony Xplode...they will do anything to make it seem special

 

[girafe06]

Well the manual doesn't mention it, and when u are cycling through the lpf frequency options there is an "off" option there. The next option in the menu is lpf reverse or normal. Yes it is an xplod. Bt3600u or something like that.

 

[ciaonzo 5,000+ posts]

Well the manual doesn't mention it, and when u are cycling through the lpf frequency options there is an "off" option there. The next option in the menu is lpf reverse or normal. Yes it is an xplod. Bt3600u or something like that.

Then, without a doubt, you are describing the option to reverse the polarity of the subwoofer output, lol. Why would anyone want to do this, you ask? Because phase is always an issue when trying to blend any drivers that are handing off to each other in the same range of frequencies. You need to find out which one is offering cancellation effects and use the other setting.