SPU 85th Anniversary

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Description

The expectations about influence on sound reproduction from this very beautiful anniversary design (yet with all the previous classic elements preserved in the motor system) now had to be examined by the Ortofon Listening Panel. SPU 85 prototypes were made to be compared to SPU systems mounted in standard metal housing with the same motor system.

The Panel proclaimed: Very charming, open, dynamic, straightforward and present intermediate tone range between 200 and 1500 Hz typical for the SPU sound.

The wooden housing first of all seems to have strong influence especially in the range from say 4000 Hz and up, resulting in a very pleasant integration with intermediate frequency range compared to the metal housing. The musical integrity obviously tends to be improved by the lower Q for resonance in the wooden housing compared to the metal.

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SPU 85th Anniversary Technical data

Output voltage at 1000 Hz, 5cm/sec. – 0,4 mV
Channel balance at 1 kHz – < 1,5 dB Channel separation at 1 kHz – > 23 dB
Frequency range at – 3dB – 20-30.000 Hz
Frequency response – 20-20.000 Hz +2 dB/-1 dB
Tracking ability at 315Hz lateral – 80 µm
Compliance, dynamic, lateral – 8 µm/mN
Stylus type – Nude ellipticall
Stylus tip radius – r/R 8/18 µm

Tracking force range – 3,0 – 4,0 g (30 – 40 mN)
Tracking force, recommended – 3,5 g
Tracking angle – 20°
Internal impedance, DC resistance per channel – 3,5 Ohm
Recommended load impedance – 50 – 100 Ohm
Cartridge body material – Hida Beech wood + Urushi lacquer method
Cartridge colour – Dark maroon
Cartridge weight – 30 g

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