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Log vs stepped attenuator vs.impedance and frequency rolloff

I'm trying various log volume pots as a source line attenuator. They all seem to dull the dynamics and roll off the treble to some degree.

Would using a stepped attenuator with quality descrete resistors solve those problems? I found this outline to try.

thanks
charles

Step1 Attenuation = Infinity dB, Rx = 250000 ohms, Ry = 0 ohms, (249K - 0)
Step2 Attenuation = 69 dB, Rx = 249911 ohms, Ry = 89 ohms, (249K - 88.7R)
Step3 Attenuation = 64 dB, Rx = 249842 ohms, Ry = 158 ohms, (249K - 158R)
Step4 Attenuation = 59 dB, Rx = 249719 ohms, Ry = 281 ohms, (249K - 280R)
Step5 Attenuation = 54 dB, Rx = 249501 ohms, Ry = 499 ohms, (249K - 499R)
Step6 Attenuation = 49 dB, Rx = 249113 ohms, Ry = 887 ohms, (249K - 887R)
Step7 Attenuation = 44 dB, Rx = 248423 ohms, Ry = 1577 ohms,(249K - 1.58K)
Step8 Attenuation = 40 dB, Rx = 247500 ohms, Ry = 2500 ohms,(249K - 2.49K)
Step9 Attenuation = 36 dB, Rx = 246038 ohms, Ry = 3962 ohms,(243K - 3.92K)
Step10 Attenuation = 34 dB, Rx = 245012 ohms, Ry = 4988 ohms,243K - 4.99K)
Step11 Attenuation = 32 dB, Rx = 243720 ohms, Ry = 6280 ohms,243K - 6.34K)
Step12 Attenuation = 30 dB, Rx = 242094 ohms, Ry = 7906 ohms,243K - 7.87K)
Step13 Attenuation = 28 dB, Rx = 240047 ohms, Ry = 9953 ohms,237K - 9.76K)
Step14 Attenuation = 26 dB, Rx = 237470 ohms, Ry = 12530 ohms237K - 12.4K)
Step15 Attenuation = 24 dB, Rx = 234226 ohms, Ry = 15774 ohms232K - 15.8K)
Step16 Attenuation = 22 dB, Rx = 230142 ohms, Ry = 19858 ohms232K - 19.6K)
Step17 Attenuation = 20 dB, Rx = 225000 ohms, Ry = 25000 ohms226K - 24.9K)
Step18 Attenuation = 18 dB, Rx = 218527 ohms, Ry = 31473ohms221K - 31.6K)
Step19 Attenuation = 15 dB, Rx = 205543 ohms, Ry = 44457 ohms205K - 44.2K)
Step20 Attenuation = 12 dB, Rx = 187203 ohms, Ry = 62797 ohms187K - 63.4K)
Step21 Attenuation = 9 dB, Rx = 161297 ohms, Ry = 88703 ohms,162K - 88.7K)
Step22 Attenuation = 6 dB, Rx = 124703 ohms, Ry = 125297 ohms,124K - 124K)
Step23 Attenuation = 3 dB, Rx = 73014 ohms, Ry = 176986 ohms,73.2K - 178K)
Step24 Attenuation = 0 dB, Rx = 0 ohms, Ry = 250000 ohms (0 - 249K)


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Topic - Log vs stepped attenuator vs.impedance and frequency rolloff - airtime 09:39:25 07/31/14 (3)

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