I want to build a 4.1 system (PLS HELP)

adi81bv · 6th February 2006, 01:15 PM

Hi.

I need some help, beacause I cant figure it out how to separate the bass fron a 4 channel source and the merging the 4 bass signals into one amp for the woofer.

I need a cheap solution, but not the worst stuff for the sound quality.

Nordic · 6th February 2006, 01:24 PM

do a search for Haffler matrix... it might help you

sreten · 6th February 2006, 01:28 PM

Hi,

you cannot connect 4 outputs directly together.

You can connect the 4 inputs to a 4 input mixer, basically an op-amp
that uses shunt feedback with 4 input resistors, the mono out you
can then low pass filter.

You will still need 4 high pass filters.

/sreten.

Nordic · 6th February 2006, 03:20 PM

He can split and sum the signal from the source with the Haffler

adi81bv · 6th February 2006, 08:25 PM

the but I didn't found to much from "Haffler matrix" search on google.....

Nordic · 6th February 2006, 08:36 PM

Stereo to 5.1 hafler matrix decoder

adi81bv · 7th February 2006, 12:48 PM

Sorry but I don't need that.

I have a 4 channel source and I want to put a low-pass and a hi-pass active filter on each channel.

Then take the tha signal from the 4 hi-pass filters and use them as an input for the 4 channel TDA amplifier - for the satelites of the audio system.

Then I will have another 4 signals from tha low-pass filters, that I want to mix them and use this signal for a mono amplifier that will drive the woofer.

I don't know how to mix the signals.

{Another question: It is OK to saparate like this:

woofer <400Hz
each satelite >100Hz (the speaker will be a full range, 10cm diameter)}

Bazukaz · 7th February 2006, 12:58 PM

Not good. Subwoofer should go up to around 100Hz max.Channel separation starts at higher frequencies.

abid_rehan · 7th February 2006, 01:46 PM

I have recently completed my 2.1 system with active crossover and digipots, its like this:
stereo inputs goto Priceton Technology PT2388 preset equalizer, after that to PGA2310, then a buffer of OPA627/BUF634, after that two channels goto OPA549 based gainclones, also they goto active crossover 8th order, after that its output if fed to DRV134 and 2 OPA541s, and thats about it.I ll try to upload project details soon for other so that they could use it for themselves.
All u ll need to do is add input for another 2 channels and ur 4.1 will be up and running.

Nordic · 7th February 2006, 02:57 PM

Look you don't need to use the other channels... just get the sub cahnnel from there the left and right inputs are also the left and right outputs... so the signal can carry on cleanly to the rest of your crossover network etc...

6th February 2006, 08:25 PM	#5
adi81bv diyAudio Member Join Date: Nov 2005 Location: bv	the but I didn't found to much from "Haffler matrix" search on google..... __________________ /\o/\

7th February 2006, 12:48 PM	#7
adi81bv diyAudio Member Join Date: Nov 2005 Location: bv	Sorry but I don't need that. I have a 4 channel source and I want to put a low-pass and a hi-pass active filter on each channel. Then take the tha signal from the 4 hi-pass filters and use them as an input for the 4 channel TDA amplifier - for the satelites of the audio system. Then I will have another 4 signals from tha low-pass filters, that I want to mix them and use this signal for a mono amplifier that will drive the woofer. I don't know how to mix the signals. {Another question: It is OK to saparate like this: woofer <400Hz each satelite >100Hz (the speaker will be a full range, 10cm diameter)} __________________ /\o/\

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6th February 2006, 01:24 PM	#2
Nordic diyAudio Member Join Date: Sep 2005	do a search for Haffler matrix... it might help you

6th February 2006, 01:28 PM	#3
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, you cannot connect 4 outputs directly together. You can connect the 4 inputs to a 4 input mixer, basically an op-amp that uses shunt feedback with 4 input resistors, the mono out you can then low pass filter. You will still need 4 high pass filters. /sreten.

6th February 2006, 03:20 PM	#4
Nordic diyAudio Member Join Date: Sep 2005	He can split and sum the signal from the source with the Haffler

6th February 2006, 08:36 PM	#6
Nordic diyAudio Member Join Date: Sep 2005	Stereo to 5.1 hafler matrix decoder

7th February 2006, 12:58 PM	#8
Bazukaz diyAudio Member Join Date: Nov 2005 Location: Vilnius	Not good. Subwoofer should go up to around 100Hz max.Channel separation starts at higher frequencies.

7th February 2006, 01:46 PM	#9
abid_rehan diyAudio Member Join Date: Mar 2007	I have recently completed my 2.1 system with active crossover and digipots, its like this: stereo inputs goto Priceton Technology PT2388 preset equalizer, after that to PGA2310, then a buffer of OPA627/BUF634, after that two channels goto OPA549 based gainclones, also they goto active crossover 8th order, after that its output if fed to DRV134 and 2 OPA541s, and thats about it.I ll try to upload project details soon for other so that they could use it for themselves. All u ll need to do is add input for another 2 channels and ur 4.1 will be up and running.

7th February 2006, 02:57 PM	#10
Nordic diyAudio Member Join Date: Sep 2005	Look you don't need to use the other channels... just get the sub cahnnel from there the left and right inputs are also the left and right outputs... so the signal can carry on cleanly to the rest of your crossover network etc...

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