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Modern Linestages

This is a general question about how complex and expensive some linestages have become. I'm looking to understand why? I can grasp that really good volume controls are complicated and that equally good switches are not inexpensive. I also have a general understanding of the importance of a high quality power supply, which again is not going to come cheap. I just don't comprehend how you get to a 50lbs. plus preamps that cost well over $20k. Is this level of complexity really needed or is it the equivalent of the spate of 500hp "sedans" for every day driving?
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charles1dad's avatar
charles1dad
10,230 posts
 
In theory a passive linestage "should" be all that`s needed with the higher output sources use these days. The reality is however in "most" systems a good active linestage simply sounds more complete and life-like, there`s more "there".
inna
7,132 posts
 
I have zero knowledge too but my guess is that power supply is always very important, be it phono stage, line level preamp or power amp. And this is probably not cheap or easy to really get it right.
georgehifi's avatar
georgehifi
10,312 posts
 
The secrete to having the perfect passive attenuator without losing or adding anything to the sound of the source (being true to the source)
1: Is to make sure the sources ouput impedance is 5 x or less the attenuators input impedance.
2: To make sure the power amps input impedance is 5 x or more the attenuators output impedance.
This then will give you the sound that you would get if you pluged the source directly into the power amp, yet with control over the volume.
Cheers George
knghifi
1,668 posts
 
I agree with Charles1dad, yes in theory ... I bought a LSA for the summer. Use 1 week when new and 4 days 2 weeks ago and back in the box it goes. Miss my active, LSA is good but just doesn't pull me into the music, not by a long shot.
swampwalker's avatar
swampwalker
5,138 posts
 
Just to make my earlier post more clear, I meant that I believe that with active line stages, a well-designed, well-implemented power supply is a VERY important element. I am told (no knowledge in this area) the actual circuit can be very simple. Assuming that is the case, then I think that the power supply becomes the critical variable.
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