Manufacturer
Pro-Ject Phono Box S

Pro-Ject Phono Box S

  (1 Review)
£135.00    
£112.50 Exc. VAT |  |
  

  

Pro-Ject Phono Box S

RIAA equalisation is a form of pre-emphasis on recording and de-emphasis on playback. A recording is made with the low frequencies reduced and the high frequencies boosted, and on playback the opposite occurs. The net result is a flat frequency response, but withattenuation of high frequency noise such as hiss and clicks that arise from the recording medium. Reducing the low frequencies also limits the excursions the cutter needs to make when cutting a groove. Groove width is thus reduced, allowing more grooves to fit into a given surface area, permitting longer recording times. This also reduces physical stresses on the stylus which might otherwise cause distortion or groove damage during playback.

A potential drawback of the system is that rumble from the playback turntable's drive mechanism is amplified by the low frequency boost that occurs on playback. Players must therefore be designed to limit rumble, more so than if RIAA equalization did not occur.

RIAA equalization is not a simple low-pass filter. It defines transition points in three places: 75 µs, 318 µs and 3180 µs, which correspond to 2122 Hz, 500 Hz and 50 Hz (rounded values). Implementing this characteristic is not especially difficult, but is more involved than a simple amplifier. In the past, almost all hi-fi preamplifiers, integrated amplifiers, and receivers had a built-in phono preamplifier with the RIAA characteristic, but it is often omitted in modern designs, due to the gradual obsolescence of vinyl records. Add-on phono preamplifiers with the RIAA equalization curve are available; these adapt a magnetic phono cartridge to an unbalanced −10 dB consumer line-level RCA input. Some modern turntables feature built-in preamplification to the RIAA standard. Special preamplifiers are also available for the various equalization curves used on pre-1954 records.

This new phono preamplifier offers unrivalled performance and unique flexibilty, which never before was available at this price!  

Sonic quality of Phono Box S is extremely impressive, a big improvement and a perfect upgrade for most analogue hifi system.  

With a wide range of setting parameters, it can meet the needs of almost any phono cartridge on the market. A switchable subsonic filter prevents your amplifier and speakers of ultra low rumble below 20Hz. Carefully selected amplifier modules and audiophile-grade polypropylene capacitors make it possible to enjoy your valuable vinyl collection like never before!  

 

TECHNICAL SPECIFICATIONS

 

Input impedance 10/100/1000 Ohms(MC)/ 47kOhms (MM)
Input capacitance 100/200/320/420pF
Gain switch 40/43/60/63dB
Subsonic switch -12dB @ 20Hz
Signal-to-noise ratio MM: 86dB (94dB – IEC -A)
  MC: 68dB (75dB - IEC -A)
THD 0,01% MM/ 0,05% MC
RIAA deviance max. 0,4dB / 20Hz - 20kHz
In/Out sockets 1 pair RCA connectors
power consumption 18V/85mA
oversized power supply 18Volt DC/500mA
Dimensions (WxHxD) 103 x 36 x 104 mm
  103 x 36 x 115 mm (with sockets)
face plate colour silver or black
weight 570 g net
Average Rating (1 Review):  
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Rating:  
Project Phono Box S2
04 April 2021  | 

A good phono stage. Much more "musical" with wider soundstage & background detail than its predecessor.

Recommended

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