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Old 12th December 2012, 12:59 AM   #11
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Indeed. What is the input impedance of the 1875? I could not find it. It's probably low, but not that low. How about the tolerance on the input cap?

You can lower the low frequency cutoff by increasing the 1 uF capacitor if you like. Try a 2.2 uf cap instead. Are you using an electrolytic? You can get away with using an electrolytic input cap in a single supply amplifier. And you could beef up the "virtual ground" too with a bigger electrolytic (not too big) and a 0.1 uF cap in parallel with the electrolytic.
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Old 12th December 2012, 01:43 AM   #12
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What impedance dummy load did you use? 4 ohm gives -3dB of 18 Hz. This agrees with your measurements.
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