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RCM Audio Sensor 2, Manual, Page: 1 / 6

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1 

 

 
THE SENSOR 2 
 
Thank you for purchasing the RCM Sensor 2 phono preamplifier. We are certain you will be delighted with the 
performance when partnered with your favorite turntable and cartridge. 
 

Please read this manual carefully before connecting the Sensor 2 to your system.  

 

 

 

illustration 1 

 
DESCRIPTION 

 
Unlike  the  output  from  a  CD  player  the  raw  signal  from  a  phono  cartridge  suffers  frequency  distortion 
because the output at 20 Hz is 1000 times lower than that at 20 kHz. This is deliberately implemented during 
the recording process to enable the signal to be cut into the vinyl of the record. The phono preamplifier must 
restore the frequencies to their correct balance using an RIAA equalization curve. The Sensor 2 uses passive 
equalization in two stages to achieve this. 

Summary of Contents for Sensor 2

Page 1: ... 1 DESCRIPTION Unlike the output from a CD player the raw signal from a phono cartridge suffers frequency distortion because the output at 20 Hz is 1000 times lower than that at 20 kHz This is deliberately implemented during the recording process to enable the signal to be cut into the vinyl of the record The phono preamplifier must restore the frequencies to their correct balance using an RIAA eq...

Page 2: ...turntable The power supply can be located some distance away for convenience and to minimize noise If you hear any hum or noise please move the preamplifier around until the noise goes away Because of the very high amplification factor it can pick up stray hum fields from other pieces of equipment Connect the power supply chassis to the Sensor 2 amplifier chassis with the umbilical cable provided ...

Page 3: ...e output of the preamplifier to match the other sources in the system Start with all the switches in the OFF position and successively switch each one in and out until you reach the desired level to match other sources 0 3 mV 0 4 mV 0 6 mV 0 9 mV 1 4 mV 2 5 mV 5 0 mV ...

Page 4: ...ge specifications However it is best to adjust this by ear You can progressively switch the DIP switches ON to increase the impedance As you do so the sound will become progressively tighter and cleaner As you pass the optimum position the sound will become slow and dull Therefore you will want to settle on a position where the cartridge sounds lively but controlled This will generally be just bef...

Page 5: ...peration mode This will give your system the lowest noise floor and best sound quality Input mode Wiring diagram for balanced and unbalanced input using RCA connection Great care has been exercised in manufacturing this product for your enjoyment If you have any questions please feel free to contact us for advice We wish you many hours of happy listening RCM Audio ...

Page 6: ...in 52 76 dB 2 V rms output at 1 kHz Input impedance 20 Ohm 47 kOhm selectable in 8 steps Input capacitance 150 pF THD 0 01 1 kHz S N 85 dB lowest gain settings RIAA linearity 0 3 dB 20 Hz 20 kHz Output impedance 50 ohm Nominal output 2 V rms Maximum output 8 V rms Power consuption 17 W Dimensions Preamplifier W 245 x D 227 x H 110 mm 3 5 kgs Power Supply W 122 x D 230 x H 70 mm 1 7 kgs ...

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