Sequel 40:
Gain: 100 (40 dB)
Frequency Response: 20 Hz to 20 kHz +/- 0.25 dB
Signal to Noise Ratio: - 83 dB
Total Harmonic Distortion: < 0.03%
R1AA deviation: +/- 0.5%
Output: 250 mV from 2.5mV input
Input Sensitivity / Impedance/ Capacitance: 3.5 mV / 47K Ohm / 220pF
Overload Margin: 22 dB
Suitable for: medium to high output MM cartridges in the range of 3.5 mV - 5 mV output

Sequel 48:
Gain: 250 (48 dB)
Frequency Response: 20 Hz to 20 kHz +/- 0.25 dB
Signal to Noise Ratio: - 83 dB
Total Harmonic Distortion: < 0.03%
R1AA deviation: +/- 0.5%
Output: 250 mV from 1mV input
Input Sensitivity / Impedance/ Capacitance: 1 mV / 47K Ohm / 220pF
Overload Margin: 22 dB
Suitable for: high output MC or low output MM cartridges in the range of 0.9mV -2 mV output

Sequel 54:
Gain: 500 (54dB)
Frequency Response: 20 Hz to 20 kHz +/- 0.25 dB
Signal to Noise Ratio: - 75 dB
Total Harmonic Distortion: < 0.05%
R1AA deviation: +/- 0.5%
Output level: 250 mV from 0.5mV input
Input Sensitivity / Impedance/ Capacitance: 0.5 mV / 1000 Ohm / 3300 pF
Overload Margin: 22 dB
Suitable for: medium output cartridges in the range of 0.5 mV - 1 mV output