Preamplifier circuit design

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You have some of the blocks in the wrong order and are confusing stereo with mono. I think it should be like this:

You do not need a high impedance input for the preamp unless you use a cheap 50 years old ceramic phono pickup as the signal source.
 

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When I build any amplifier I won't put low pass nor high pass filters in the amplifier so my block diagram wouldn't be drawn like how you did it.

The preamp I made a sketch of will be inside the same enclosure as the amplifier, so the stereo signal leaving my laptop would naturally go to a cross over then to the input of the amplifier then out to speakers.

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My cross over is an external active cross over so I wouldn't be able to set it up the way you have it unless I build a cross over for myself and put it inside the same enclosure that the amplifier is in.
 
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