SPL Phonos
SPL Phonos
₹199,800

  • SPL Phonos

  • SPL Phonos

SPL Phonos
Sound Performance Lab

SPL Phonos

RIAA Phono Preamplifier

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SPL Phonos
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₹199,800

Call +91 98843 04425 for availability

Analog inputs & outputs; XLR (balanced)
Maximum input & output gain
21.5 dBu
Input impedance
20 kΩ
Output impedance
75 Ω
Frequency range (-3 dB)
10 Hz – 100 kHz
THD +N (0 dBu, 10 Hz – 22 kHz))
0.005 %
Noise (A-weighted)
-96 dBu
Crosstalk (1 kHz)
-70 dB
Common mode rejection (1 kHz)
60 dB
Dynamic range
117 dB

Standard Headphones Output, 6.35 mm (1/4") TRS Jack
Wiring
Spitze = links, Ring = rechts, Schaft = GND
Source impedance
22 Ω
Noise (A-weighted, 600 Ω)
-85 dBu

Internal Linear Power Supply with Toroidal Transformer
Operating voltage for analog audio
+/- 15 V
Operating voltage for relays and LEDs
+ 12 V

Mains Power Supply
Mains voltage (selectable)
230 V AC / 50; 115 V AC / 60 Hz
Fuse for 230 V
T 315 mA
Fuse for 115 V
T 630 mA
Power consumption
max. 10 W

Dimensions & Weight
W x H x D (width x height incl. feet x depth)
215 x 100 x 220 mm
8.46 x 3.58 x 8.66 inch
Unit weight
2.1 kg
4.63 lbs
Shipping weight (incl. packaging)
4 kg
8.82 lbs

    The 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. The Phonos offers a choice of three capacitors to correct the linearity of the frequency and phase response. The capacitances are 150 pF, 220 pF and 330 pF. In the off-position the capacitance is determined by the capacitance of the cable.

    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.

    MC pickups have a very low inductance and impedance. 
    This means that the effects of cable capacitance (from turntable to preamplifier) are negligible. The impedance, however, is relevant and can be set in six positions: 100, 220, 470, 2.2 k, 4.7 k, and 10 kOhm.
    If there is any doubt as to which impedance matches that of the pickup, the impedances can also simply be switched through until the linear frequency response is acoustically determined.

    The output voltage, however, is very low at only a few hundred microvolts and is therefore more sensitive to noise and induced hum. This makes preamplifier design a challenge, because the very low output voltage must be pre-amplified extremely noise-free. Phonos offers one of the most powerful phono preamplifiers for MC systems with up to 71.5 dB preamplification. Thanks to the 120V technology, the preamplifiers are extremely low-noise, linear and phase-locked.

    Perfect level
    The gain control can be used to determine the amplifier power, in other words, the output level of the Phonos.
    There are three values to choose from.
    In the “Norm” position, the gain is +46 dB for MM systems and +67 dB for MC systems.
    With the switch set to “-10”, the gain is reduced by 10 dB (MM = +36 dB, MC = +57 dB). This is optimal in combination with standard HiFi equipment that works with a reference level of -10 dBV. 
    If the switch is in the “+4” position, the gain is increased by +4 dB (MM = +50 dB, MC = +71 dB).
    So the output level is about as loud as that of modern DA-converters at a reference level of 0 dBfs = 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 a banana plug socket. The ground lead can be either clamped or plugged in.


    Sounds good
    With all devices of the Professional Fidelity series, we develop not only according to plan, but also by ear. Many important components are installed on the circuit boards using Through-hole technology. This way we can ensure that we can use the best sounding components.

    The VOLTAiR Technology
    The 120V technology is our reference technology. The 120V technology is unique in the world. It operates at a DC voltage of 120 volts. This is four times that of IC-based semiconductor op-amps. In our Professional Fidelity series, we refer to this unsurpassed technology as VOLTAiR technology.

    SPL Audio Professional Fidelity

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