Product Guide

PRODUCT INFORMATION
Technical data and price changes reserved.
Page 3/5
PRO-JECT AUDIO SYSTEMS
www.project-audio.com
cuit board, twice as many electrical components and be
twice as careful with planning your circuit board layout.
As a result, the Phono Box RS2 excels at suppressing
unwanted noise, errors and interferences and oers the
best signal to noise ratio possible.
Split passive EQ
The Phono Box RS2 uses split passive equalization for
both of its RIAA and DECA curves. This is more costly
to design and implement but ensures the most accurate
representation of the ideal EQ curve. Split passive equa-
lization allows for better impedance matching and lower
deviation from the ideal RIAA or DECA curve.
Extreme cartridge loading options
Gain
No other phono-preamp in the world has such ne op-
tions of setting the gain like the Phono Box RS2. Very
large ranges from 40dB (voltage amplication by 100x)
up to 70dB (voltage amplication by 3690x) are possib-
le. You can see the big increase in amplication between
40dB and 70dB and this is why a phono preamp must
be incredibly silent (a fully balanced design makes a big
dierence here) to handle amplication levels this high.
The Phono Box RS2 is able to do this just perfectly. You
can perfectly match it with a wide variety of cartridges
and perfectly integrate it into the rest of your Hi system,
matching the volume levels accurately to other sources
like CD players or streaming devices.
Impedance
Load impedance can be set continuously via potentio-
meter, a system invented by Pro-Ject Audio Systems. It
allows you to seamlessly adjust the impedance during
playback and immediately assess the impact of dierent
loading options. This is necessary to nd just the right
load impedance for your cartridge. No other manufactu-
rers implement this feature in this extreme way!
Balance function
Cartridges, by nature, suer from small imbalances bet-
ween the left and right channels. To correct this the Pho-
no Box RS2 introduces a new feature that is absolutely
rare in this price category. A potentiometer allows you
to adjust the exact center of the sound stage in ranges
of 2dB to the left or right. This function can be switched
o in order to keep the signal path as short as possible,
or if it is not needed. For example, Ortofon declares that
their very popular cartridge 2M Red has a channel balan-
ce of 1,5dB at 1kHz. Their very expensive MC cartridge
Anna Diamond has a channel balance of, still, 0,5dB. The-
se small dierences can be accurately balanced by the
Phono Box RS2.
Practically, there is no MM or MC cartridge that the Pho-
no Box RS2 can’t handle.
Power Supply
The Phono Box RS2 is powered from an external adap-
ter which is rated 20V/3A. If you have an amplier where
there is a 3500x voltage gain and the input sensitivity is
a few hundred micro-volts (0,0001 Volt) you will deniti-
vely want to keep it as far away as possible from all sour-
ces of interference which can harm the vulnerable signal
from cartridge. That is why it is important to keep all the
parts which can radiate electromagnetic elds out of the
amplier range. This is the reason why we are using an
outboard power supply. Due to legal requirements, this
power supply must be a switch mode type with guaran-
teed stand-by mode power consumption 0,1W.