Is Lowpass filter needed in 6ch amp?

Wynand · 24th November 2005, 12:13 PM

I'm wondering, do I need to put a LP filter on my SW channel, or do DVD players already filter the music.

The same goes for PC outputs.

Wynand · 24th November 2005, 12:16 PM

Would a 2nd order filter do the trick or do I need to do something more severe?

richie00boy · 24th November 2005, 12:56 PM

The LFE channel is already filtered. However, whilst it is fine for movies as the channel is a separate discrete track, it is a bit hit-and-miss if the chosen F3 is suitable for your main speakers integration when listening to stereo music.

I have a switch on my sub for movie and music modes so I can switch a dedicated (my own) filter in for music and out for movies. But this means that I use the LFE signal for movies and use front left and front right signals (mixed) for music, so 3 input leads to the sub.

Wynand · 24th November 2005, 04:26 PM

Thank you, I was wondering about the 2.1(sub with stereo) issue aswell.

What I'm thinking of doing is to control the whole amp with an atmel uC so I'll make it switch over automatically.

Another way would probably be to make the system 5.2 but that's a bit overkill for me for now.

To think, this project started of to learn Microprocessors.

Wynand · 24th November 2005, 04:34 PM

Thank you, I was wondering about the 2.1(sub with stereo) issue aswell.

What I'm thinking of doing is to control the whole amp with an atmel uC so I'll make it switch over automatically.

Another way would probably be to make the system 5.2 but that's a bit overkill for me for now.

To think, this project started of to learn Microprocessors.

24th November 2005, 12:13 PM	#1
Wynand diyAudio Member Join Date: Mar 2005 Location: Cape Town	Is Lowpass filter needed in 6ch amp? I'm wondering, do I need to put a LP filter on my SW channel, or do DVD players already filter the music. The same goes for PC outputs.

24th November 2005, 12:56 PM	#3
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	The LFE channel is already filtered. However, whilst it is fine for movies as the channel is a separate discrete track, it is a bit hit-and-miss if the chosen F3 is suitable for your main speakers integration when listening to stereo music. I have a switch on my sub for movie and music modes so I can switch a dedicated (my own) filter in for music and out for movies. But this means that I use the LFE signal for movies and use front left and front right signals (mixed) for music, so 3 input leads to the sub. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

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24th November 2005, 12:16 PM	#2
Wynand diyAudio Member Join Date: Mar 2005 Location: Cape Town	Would a 2nd order filter do the trick or do I need to do something more severe?

24th November 2005, 04:26 PM	#4
Wynand diyAudio Member Join Date: Mar 2005 Location: Cape Town	Thank you, I was wondering about the 2.1(sub with stereo) issue aswell. What I'm thinking of doing is to control the whole amp with an atmel uC so I'll make it switch over automatically. Another way would probably be to make the system 5.2 but that's a bit overkill for me for now. To think, this project started of to learn Microprocessors.

24th November 2005, 04:34 PM	#5
Wynand diyAudio Member Join Date: Mar 2005 Location: Cape Town	Thank you, I was wondering about the 2.1(sub with stereo) issue aswell. What I'm thinking of doing is to control the whole amp with an atmel uC so I'll make it switch over automatically. Another way would probably be to make the system 5.2 but that's a bit overkill for me for now. To think, this project started of to learn Microprocessors.

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