Pro-Ject Phono Box S2 Phono Preamp For MC and MM

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A nice improvement to the basic phono section built into your existing preamp.

Very clean, tested and working as it should.

Click below to add our recommended matching cables from Kimber Kable, all brand new as SkyFi is an official Kimber dealer.

Select Series - KS PHONO Tonearm Interconnects

Kimber Kable - RCA Interconnects

More from Pro-Ject:
Phono Box S2 MM/MC phono preamplifier

Setting new standards for entry level phono stages!

Phono Box S was one of our favourite products, it offered unrivalled sonics and versitality at a very affordable price. When we started creating Phono Box S2, its successor, it had to have exactly that but improve on sound even further. Phono Box S2 features incredible micro-details, dynamics and precision with a soundstage usually found in much more expensive products. The new S2 style housing is made of an aluminium/metal sandwich construction and not only offers highest aesthetics but also out-standingly protects it from unwanted electromagnetic interferences and vibrations. This guarantees for an undisturbed listening experience without worries. The switches on the bottom of the unit allow fine tuning the sound to your preferences and adjusting Phono Box S2 to any available cartridge!

Phono Box S was considered the best option of all entry-level phono stages by many acclaimed hifi magazines, Phono Box S2 is sure to follow its predecessor‘s footsteps and will set new standards at this price point!

Compatible optional upgrade power supply: Accu Box S2 (Not included in this listing)

Features
• Audiophile Performance
• Dual mono configuration
• Audiophile-grade amplification modules
• Audiophile-grade polypropylene WIMA capacitors
• Precise RIAA equalisation
• Switchable Subsonic filter –12dB @ 20Hz
• Switchable input impedance/capacitance
• 4 adjustable gain levels
• Outstanding sound quality
• Available in silver or black

Technical Specifications
Input impedance
10 Ohm/ 100 Ohm/1 kOhm / 47 kOhm

Input capacitance
100 pF/ 200 pF/ 320 pF/ 420 pF

Gain switch
40 dB/ 43 dB/ 60 dB/ 63 dB

Subsonic switch
-12 dB @ 20 Hz

Signal-to-noise ratio
85 dB

THD+N
0.01% MM/ 0.05% MC

RIAA accuracy
< 0,4 dB / 20 Hz - 20 kHz

In/Out sockets
1 pair RCA connectors

Power consumption
18 V / 85 mA

Outboard power supply
18 Volt DC/ 500 mA

Dimensions ( W x H x D )
103 x 36 x 115 mm

Face plate colour
silver or black

Weight
570 g net

Pro-Ject Phono Box S2 Phono Preamp - Owners Manual

The SkyFi Testing Process for Preamplifiers:

We start with a visual inspection of all internal components to make sure that there are no signs of heat stress or damage. Capacitors are checked for telltale signs of predictive failure including bulging, shrunken wrappers, or physical leakage. We also inspect the PCBs for discoloration from resistors or transistors that may have been running hot. On vintage units we often spot check select capacitors for value and ESR.

When we first power on a preamplifier we connect its RCA output to a Sencore PA81 Power Analyzer which simulates real world loading conditions and gives us an oscilloscope interface. The first order of business is checking that the volume control works smoothly throughout its entire range with acceptable channel balance. This is accomplished by feeding a 1KHz sine wave into one of the preamp’s line level inputs while monitoring the preamp’s output on an oscilloscope. We then switch to a 1KHz square wave to test the tone controls, loudness function, and filters where applicable. During this step we are watching for equal alteration of the test signal by both channels. This also helps us identify dirty controls that will need treatment. Once the basic line stage functions are verified, we test each input individually. This is especially important for devices that use relays to select their sources. If the preamp is equipped with a phono stage we test that as well. We use an inverse RIAA filter which allows us to feed a reference test signal into the phono input with the proper RIAA equalization and level. A square wave or sine sweep is used to verify that the device’s phono stage is faithfully reproducing the RIAA curve. If the preamp under test has balanced inputs and/or outputs these are tested as well.

We finish up our bench testing with a listening test with our bench amplifier and reference speakers. During this test we check for hum or hiss that may not have shown up in earlier testing. We also check that all of the tone controls and filters perform as expected. If the preamplifier has remote control functions these are also tested. Preamps with tube circuits or complicated power supply topologies are connected at our long term test rig for extended stress testing under real world conditions.