Can a fixed and variable LPF be used at the same time?

GuyPanico · 8th April 2005, 02:08 AM

The amp i'm looking to get has a 12db variable xover on it. To get a sharper rolloff could I also use a 80hz 12db LPF? I only ask because I have one laying around from parts express. Would there be adverse effects? Or would they simply work together as I suspect? Thanks guys!!

BassAwdyO · 8th April 2005, 02:25 AM

I dont think a passive sub filter is really your best option be it variable or not! High slope is required and the losses in a passive crossover become high.

simon5 · 8th April 2005, 06:53 AM

The signal will be attenuated first by the variable x-over so I guess he won't lose too much in power and heat.

If you use the variable x-over below 80 Hz or at 80 Hz, I'm quite sure you can use both. Check if the x-over can take some power and heat.

8th April 2005, 02:08 AM	#1
GuyPanico diyAudio Member Join Date: Mar 2005 Location: Euless, TX	Can a fixed and variable LPF be used at the same time? The amp i'm looking to get has a 12db variable xover on it. To get a sharper rolloff could I also use a 80hz 12db LPF? I only ask because I have one laying around from parts express. Would there be adverse effects? Or would they simply work together as I suspect? Thanks guys!!

8th April 2005, 02:25 AM	#2
BassAwdyO diyAudio Member Join Date: Jun 2004 Location: Illinois	I dont think a passive sub filter is really your best option be it variable or not! High slope is required and the losses in a passive crossover become high. __________________ The golden rule of DIY: Build nice, or build twice!

8th April 2005, 06:53 AM	#3
simon5 diyAudio Member Join Date: Nov 2004 Location: Québec, Québec	The signal will be attenuated first by the variable x-over so I guess he won't lose too much in power and heat. If you use the variable x-over below 80 Hz or at 80 Hz, I'm quite sure you can use both. Check if the x-over can take some power and heat. __________________ DIYaudio for President !

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