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The Phono Box RS2 sets out to be the ultimate phono preamplifier, in the highest class. It is a fully discrete, fully balanced dual-mono device with split passive RIAA and DECCA equalisation, resulting in a “no expense spared” phono stage designed to achieve the best possible sound. It is also extensively adjustable, suiting it to any system, environment or personal listening taste.
After countless hours of listening tests and many years of experience, the Pro-Ject design team took the decision to employ discrete circuitry in the Phono Box RS2. Discrete circuits involve no operational amplifiers (op-amps), and the result is a more neutral, natural, dynamic, and vivid sound. They are more complicated to put together and involve a greater variety of components, but the result when utilised in a well-organised electrical layout is a true high-end sound.
Elsewhere the Phono Box RS2 circuitry is fully balanced throughout, meaning the + and – signal chains are treated individually for absolute signal integrity, resulting in less unwanted noise, errors, and interferences. It is because of this layout that the phono stage measures so well in its signal-to-noise ratio.
The Phono Box RS2 uses split passive equalisation for both its RIAA and DECCA curves. This is more costly to design and implement, but ensures the most accurate representation of the ideal EQ curve, and allows for better impedance matching.
Similar attention to detail is employed throughout the cartridge matching options. The Phono Box RS2 has eight optional settings for Gain, ranging from 40dB to 70dB. As 70dB gain involves a voltage amplification of many times the original cartridge signal, the quality of the electrical circuitry is paramount and needs to be incredibly silent – hence the other electrical design choices made. However, this range of choice makes for easier system set-up, allowing you to match the turntable output to other sources connected to your amplifier.
Load impedance can be manually adjusted via one of the two front-mounted potentiometers. This innovative system allows for seamless adjustment of the impedance during playback, anywhere from 10 to 1,000Ω, allowing you to find the perfect load impedance for your cartridge. Elsewhere there are also eight different options for capacitance – allowing for better cartridge matching with MM systems.
A final innovation for the Phono Box RS2 is the introduction of a balance function. Pick-up cartridges, by their nature, suffer from small imbalances between the left and right channels. To correct this, the Phono Box RS2 features a second potentiometer on the front panel to adjust the exact centre of the sound stage, ranging from 2dB to the right or left. This range of tolerance covers almost all good cartridges, and truly means the Phono Box RS2 is one of the most versatile phono stages on the market.
To maintain signal integrity, the Phono Box RS2 is supplied with an external 20V power supply. During 2021, Pro-Ject Audio Systems will also introduce a true high-end linear power supply upgrade that will work with the Phono Box RS2. The Power Box RS2 Phono will feature a purpose-designed transformer and circuitry to deliver a clean and stable 20V signal to the Phono Box RS2 and will also feature an extra 15V output for direct connection to a supported Pro-Ject turntable.
The Phono Box RS2 is an incredibly powerful tool for high-end enthusiasts and professionals who are looking to perfectly match their turntable and cartridge to the rest of their system. However, despite its many available features, because its core focus is on absolute signal integrity and a class-leading electrical design, it will also suit users who simply expect the best sound possible from their vinyl hi-fi system. Purists can effortlessly enjoy the best sound while experts and tech-enthusiasts will find their perfect high-tech phono stage – the Phono Box RS2 truly is the ultimate solution.
|Input Impedance:||Fixed 47kohms, Variable 10-1000 ohms|
|Gain:||MM: RCA 40, 43, 46, 50dB (+6dB using XLR)
MC: RCA: 60, 63, 66, 70 dB (+6dB using XLR)
|Signal To Noise Ratio:||MM: (40dB): 89dB A-wt (10mV; < 0,0024% (MC60dB, 1kHz)|
|Input Impedance:||Fixed 47kohms, variable 10 - 1000 ohms|
|Load capacity switchable:||50, 100, 150, 200, 250, 300, 350, 400 pF|
|THD:||< 0,0015% (MM 40dB, 1kHz); < 0,0024% (MC 60dB, 1kHz)|
|Input impedance:||Fixed 47kohms, variable 10 - 1000 ohms|
|RIAA Accuracy:||within 0,4dB/20Hz - 20kHz|
|Inputs:||RCA & XLR|
|Outputs:||RCA & XLR|
|Subsonic at:||20Hz with 18dB/octave|
|Outboard Power Supply:||20V/3A DC; 110 - 240V, 50/60Hz|
|PSU:||18V / 500mA DC|
|Dimensions W x H x D (D with sockets):||206 x 72 x 200 (230)mm|
|Weight:||1600g without power supply|
|Power Consumption:||max 350mA DC|
What is a Phono Stage?
A phono stage takes the low-level electrical signal, generated by the pick-up cartridge on your turntable, and amplifies it to LINE level. When it's at LINE level, you can connect the outputs of your phono stage to any LINE or AUX input on your amplifier. If you do not have a phono stage, when you connect the turntable to your amplifier the signal will be very quiet, and if you turn it up to normal listening level it will sound distorted and noisy.
You do not need an external phono stage if...
In both of these cases, the built-in phono stage needs to support your pick-up cartridge (see below).
Do I need a specific type of Phono Stage?
Yes. You need to buy a phono stage that suits your particular type of cartridge. If you have a Moving Magnet (MM) cartridge, you need an MM-compatible phono stage. If you have a Moving Coil (MC) cartridge, you need an MC-compatible phono stage. This is due to the different output levels of MM and MC cartridges (as MC cartridges are so quiet, they require more Gain).
For more help and advice visit our Tech Support section
For more help and advice visit our Tech Support section