Accuphase AD-2900

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 analog-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 aluminum 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 kilohms ratedDifferential amplifier circuit with ultra low noise bipolar-transistors for MC cartridges.

SPECIFICATIONS

Frequency response

• MM/40dB, MC: 20～20,000Hz ±0.2dB
• MM/30dB: 20～20,000Hz ±0.3dB

AD maximum input voltage (1 kHz, 0.005% THD)

• MM/30dB INPUT: 310mV
• MM/40dB INPUT: 96.5mV
• MC/60dB INPUT: 9.5mV
• MC/70dB INPUT: 3.2mV

Gain (Gain selector set to 18 dB position, 12/18/24 dB settings available)

• AD[MM:30/40dB]INPUT → BALANCED/LINE OUTPUT: 48/58dB
• AD[MM:30/40dB]INPUT → REC OUTPUT: 30/40dB
• AD[MC:60/70dB]INPUT → BALANCED/LINE OUTPUT: 78/88dB
• AD[MC:60/70dB]INPUT → REC OUTPUT: 60/70dB

Input sensitivity and impedance

• Input, Input Sensitivity (For Rated Output/For 0.5V Output), Input Impedance
• AD-MM/30 dB INPUT, 8.0 mV, 2.0 mV, 47 kilohms
• AD-MM/40 dB INPUT, 2.5 mV, 0.63 mV, 47 kilohms
• AD-MC/60 dB INPUT, 0.25 mV, 0.063 mV, 10/30/100/300 ohms, switchable
• AD-MC/70 dB INPUT, 0.08 mV, 0.02 mV, 10/30/100/300 ohms, switchable
• BALANCED/LINE, 252 mV, 63 mV, 40/20 kilohms, switchable

Signal-to-Noise Ratio
Input, Input shorted (A weighting) S/N ratio at rated output, EIA S/N

• AD-MM/30 dB INPUT, 94 dB, 86 dB
• AD-MM/40 dB INPUT, 85 dB, 86 dB
• AD-MC/60 dB INPUT, 80 dB, 86 dB
• AD-MC/70 dB INPUT, 73 dB, 87 dB
• BALANCED/LINE, 111 dB, 110 dB