SPL Phonos ProFi Preamplifier
RIAA Phono Preamplifier
This phono preamplifier for Moving Magnet (MM) and Moving Coil (MC) pickup systems is based on the legendary Douglas-Self-Design.
MM & MC
There are two pickup systems for record players: Moving Magnet (MM) and Moving Coil (MC).
Moving Magnet
Moving magnet pickups generate a small voltage by moving a magnet between copper coils. MM pickups have a very high inductance and impedance.
Moving Coil
The MC pickup is also a small electromagnetic generator, but with the magnets firmly anchored and the coils moving between them, i.e. exactly the opposite of the MM pickup.
Amplification
The pre-amplification can be switched in three values. The normal gain value is +46 dB for MM and +67 dB for MC cartridges.
In the -10 dB position, the phono produces enough output level for normal hi-fi equipment operating at a reference level of -10 dBV.
In the +4 dB position, the output level is about as loud as that of modern DA converters at a reference level of 0dBfs = +15 dBu.
Subsonic Filter
The rumbling of the turntable’s drive mechanism is also amplified by the high amplification of the bass range due to RIAA equalization in playback. The Phonos offers a switchable subsonic filter to remove this rumble.
Connections
Gold-plated RCA sockets are available for connecting the turntable and for outputting to a preamplifier such as the Director Mk2 or the Elector.
A ground connection for the turntable is designed as banana plug socket. The ground lead can be either clamped or plugged in.
Main Features:
- Subsonic Filter
- RIAA Phono Preamplifier
- Gold-plated RCA sockets
- Based on the legendary Douglas-Self-Design.
- Moving Magnet (MM) and Moving Coil (MC) Pickup System
Analog Input & Output: RCA:
- Input impedance (MM): 47 kΩ
- Input impedance (MC): switchable
- Output impedance: 75 Ω
- Frequency range (-3 dB): 4 Hz – 300 kHz
- Crosstalk (1 kHz): -80 dBu
Moving Magnet (MM) Preamplifier:
- Amplification (Norm): 46 dB
- Amplification (-10 dB): 36 dB
- Amplification (+4 dB): 50 dB
- Capacitance (switchable): Off, 150 pF, 220 pF and 330 pF
- Noise (A-weighted; 46 dB amplification): -85.3 dBu
- Dynamic range: 131.3 dB
Moving Coil (MC) Preamplifier:
- Amplification (Norm): 67 dB
- Amplification (-10 dB): 56 dB
- Amplification (+4 dB): 71.5 dB
- Impedance (switchable): 100 Ω, 220 Ω, 470 Ω, 2.2 kΩ, 4.7 kΩ, 10 kΩ
- Noise (A-weighted, 67 dB amplification): -61.7 dBu
- Dynamic range: 128.7 dB
Internal Linear Power Supply with Shielded Toroidal Transformer:
- Operating voltage for analog audio: +/- 60 V
- Operating voltage for relays and LEDs: + 12 V
Mains Power Supply:
- Mains voltage (selectable, see fuse chamber): 230 V AC / 50; 115 V AC / 60 Hz
- Fuse for 230 V: T 500 mA
- Fuse for 115 V: T 1 A
- Power consumption: max. 30 VA
- Stand-by power consumption: < 0,3 W
