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I would like to match four speakers left from an old Philips LX3600D home cinema system with my Komplete Audio 6 interface. When I test the levels with crocodile clips I get a very low intensity sound (checked with two different speakers and two different outputs).

According to the manuals I have these specs:
all four speakers have 4 Ohms impedance, and they've had an amplifier with 50 W power output,
and the interface is for 100 Ohms unbalanced, 200 Ohms balanced.
I guessed it should give enough power, since studio monitors work on higher levels and according to these answers: https://electronics.stackexchange.com/questions/90206/how-are-speakers-matched-with-audio-amplifiers-avoiding-overloading-either I also thought impedance should be correct, but it's clear now, that I really don't understand it at all.

Can you suggest me a solution?
I know how to solder, and could make a DIY amp from a diagram with the parts given, if that would be a solution, I just don't know exactly what effect I am going for and what causes the problem.

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You are probably trying to connect passive speakers to line out level outputs, therefore the low acoustic level.

What you need is a four channels power amplifier with 4 ohms speakers outputs.

  • yeah, or active speakers/monitors instead. – Marc W Sep 13 '15 at 5:05

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