AD-2900 is the dedicated phono equalizer unit. Analog records can be reproduced with high quality by installing AD-2900 in a rear-panel slot. The AD-2900 features separate input circuitry for MC and MM cartridges to ensure optimum matching and realize outstanding S/N ratio. 2 sets of analogue-player input jacks, the AD1 and AD2 are equipped, and their selections are switchable with the INPUT selector of pre-amplifiers.

• Contains equalizer units with boards using glass cloth fluorocarbon resin with totally separated left / right channels
  
• Ideal MC/MM independent input circuit to achieve high noise performance
  
• Differential-style equalizer for high-precision RIAA characteristics
  
• Two input terminals to connect up to two tone arms
  
• Functions that can be operated from the front panel
  
• Memory settings for each input terminal
  
• Robust aluminium case to shield against external noise
  
• MC Gain : 64 / 70 dB switching Input impedance : 10 / 30 / 100 / 200 / 300 ohms switching
  
• MM Gain : 34 / 40 dB switching Input impedance : 47 kiloohms' rated
• Differential amplifier circuit with ultra low noise bipolar-transistors for MC cartridges.

Compatibility with other pre-amplifiers 
The AD-2900 is compatible with C2850/C-2820/C-2810/C-2800/C-2450/C-2420/C-2410/C-2400/C-290V/C-290.

Input
MC Input Sensitivity 64/70dB, Input Impedance 10/30/100/200/300Ω
MM Input Sensitivity 34/40dB, Input Impedance 47kΩ

Regardless of the preamplifier model, the gain is MC: 64/70 dB and MM: 34/40 dB. Note, it is different from the display of the gain switching switch when mounted on the following models: C-2820, C-2810, C-2800,C-2420, C-2410, C-240. 

Load impedance that can be selected while the MC input varies depending on the model of the preamplifier.