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The black Cambridge Audio Azur 551P Moving Magnet (MM) Phono Preamplifier is a phono pre-amp.
Most hi-fi amplifiers won't let you plug in a turntable directly. You need to connect via a phono stage (also known as a phono preamp) to make the very quiet signal from the turntable powerful enough for your main amp to work with. But it's very easy to add noise at this stage, which is why the 551P amplifies the signal without distorting it or introducing noise.
This phono stage is a Moving-Magnet-type (MM) phono stage, which describes the commonly used type of cartridge configuration typically supplied with affordable modern turntables.
The 551P works with all popular turntables that use a Moving Magnet cartridge (the stylus or needle).
Phono preamplifier with moving magnet (MM) input stage
Acoustically damped full-metal chassis with thick, brushed-aluminum front panel
Discrete transistors for the all-important input stages instead of the more common integrated circuits
Single-ended, 'Class A' gain stage with audiophile passive RIAA equalization
Eco-friendly with <1W standby power consumption
Table of Contents
Power Consumption (max)
@ 1 kHz: 39dB
For Nominal Output: 3.35mV
20Hz - 20kHz <0.009%
RIAA Curve: < +/-0.65dB 25Hz-20kHz
Signal to Noise Ratio
>85dB (using Audio Precision RIAA-1 with grounded inputs)