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Old 6th February 2006, 02:15 PM   #1
adi81bv is offline adi81bv  Romania
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Question I want to build a 4.1 system (PLS HELP)

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.
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Old 6th February 2006, 02:24 PM   #2
Nordic is offline Nordic  South Africa
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do a search for Haffler matrix... it might help you
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Old 6th February 2006, 02:28 PM   #3
sreten is offline sreten  United Kingdom
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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.
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Old 6th February 2006, 04:20 PM   #4
Nordic is offline Nordic  South Africa
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He can split and sum the signal from the source with the Haffler
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Old 6th February 2006, 09:25 PM   #5
adi81bv is offline adi81bv  Romania
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the but I didn't found to much from "Haffler matrix" search on google.....
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Old 6th February 2006, 09:36 PM   #6
Nordic is offline Nordic  South Africa
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Stereo to 5.1 hafler matrix decoder
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Old 7th February 2006, 01:48 PM   #7
adi81bv is offline adi81bv  Romania
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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)}
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Old 7th February 2006, 01:58 PM   #8
Bazukaz is offline Bazukaz  Lithuania
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Not good. Subwoofer should go up to around 100Hz max.Channel separation starts at higher frequencies.
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Old 7th February 2006, 02:46 PM   #9
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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.
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Old 7th February 2006, 03:57 PM   #10
Nordic is offline Nordic  South Africa
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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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