Loudness on or off? - 2-Channel Home Audio - The Klipsch Audio Community
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Simple Audio Loudness Control Circuit
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The Onkyo A-9010 is the single best amplifier I've heard for anywhere near the price. IMO, it should be the default answer to the “budget amplifier” question that gets asked so often :
Simple Audio Loudness Control Circuit
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Good quality audio pre amp with volume/ bass/ high/loudness control (schematic) - YouTube
Sony TA-1150 Vintage Stereo Integrated Amplifier Original Loudness Switch | eBay
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Improved Loudness Control
