SPL Phonos Duo Phono Preamplifier Black - DOUGLAS HIFI
SPL Phonos Duo Phono Preamplifier Silver - DOUGLAS HIFI
SPL Phonos Duo Phono Preamplifier (Rear) - DOUGLAS HIFI
SPL Phonos Duo Phono Preamplifier Red - DOUGLAS HIFI

SPL

SPL Phonos Duo Phono Preamplifier

$5,499.00
COLOUR
COLOUR: Black

The SPL phono preamplifier Phonos duo expands the established SPL phono preamplifier Phonos with a pair of balanced stereo inputs and outputs. Phonos duo is thus even more versatile.

Whether moving magnet (MM) or moving coil (MC) cartridge systems – the SPL VOLTAiR technology and the RIAA filter in the legendary Douglas-Self design form the fundament for an outstanding phono sound.

SPL Phonos Duo Phono Preamplifier

Moving Magnet
Moving magnet cartridges generate a voltage by moving a magnet between copper coils. In order to achieve the best possible linearity of the frequency and phase response, the capacitance is modified to adjust the cartridge.
Phonos duo offers six different capacities for this adjustment:

12 pF, 47 pF, 100 pF, 150 pF, 220 pF und 330pF.

Moving Coil
The moving coil cartridge is also a small electromagnetic generator. However, the magnets are firmly anchored – and the coils move between the magnets. This concept is exactly the opposite of the moving magnet cartridge. Consequently, it is not the capacitance but the impedance that is the decisive parameter in matching the cartridge.

Phonos duo offers six different impedances for this adjustment:
20 ohms, 50 ohms, 100 ohms , 220 ohms, 500 ohms and 1 kohm.

Free choice – balanced or unbalanced
Phonos duo offers two pairs of stereo inputs and outputs. A pair of balanced inputs and outputs with XLR inputs and outputs and a pair of unbalanced inputs and outputs with RCA connectors. The INPUT switch on the front of the Phonos duo can be used to switch between the two stereo inputs. The output signal is always present in parallel at both output – regardless of the selected input.

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. Phonos duo also features a switch on the rear panel labeled GND LIFT. This ground lift function can be used to eliminate ground loops by isolating the internal ground from the housing ground when the switch is pressed.

Perfect level
The GAIN switch can be used to set the pre-amplification, i in other words the output level of the Phonos duo. There are three values to choose from.

In the “Low” position, the amplification for MM systems is +30 dB and for MC systems +50 dB. This is ideal in combination with standard HiFi devices that operate with a reference level of -10 dBV In switch position “Med”, the amplification is increased by 10 dB (MM = +40 dB, MC = +60 dB). If the switch is in the “High” position, the gain is increased by a further 10 dB (MM = +50 dB, MC = +70 dB). This means that the output level is approximately as loud as that of modern DA converters at a reference level of 0 dBfs = 15 dBu.

Rumble
The rumbling of the turntable‘s drive mechanism is amplified by the high amplification of the bass range due to RIAA equalization in playback. The Phonos duo offers a switchable subsonic filter to remove this rumble.

Mono
The MONO switch can be used to select whether the stereo input signal should be output as a regular stereo signal or summed to mono (switch in the On position). This is useful, for example, when using a mono system to play mono records.

Specifications

Analog Input & Output: RCA & XLR (balanced)

Input impedance (MM)
47 kΩ
Input impedance (MC)
switchable
Output impedance
75 Ω
Frequency range
10 Hz – 100 kHz
Crosstalk (1 kHz)
-80 dBu

Moving Magnet (MM) Preamplifier

Amplification (Low)
30 dB
Amplification (Med)
40 dB
Amplification (High)
50 dB
Capacitance (switchable)
12, 47, 100, 150, 220, 330 pF
Noise (A-weighted; 50 dB amplification)
-82 dBu
Dynamic range (50 dB amplification)
132 dB

Moving Coil (MC) Preamplifier

Amplification (Low)
50 dB
Amplification (Med)
60
Amplification (High)
70
Impedance (switchable)
20 Ω, 50 Ω, 100 Ω, 220 Ω, 500 Ω, 1000 Ω
Noise (A-weighted, 70 dB amplification)
-62 dBu
Dynamic range (70 dB amplification)
129 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 0.5 A
Fuse for 115 V
T 1 A
Power consumption
max. 30 VA
Stand-by power consumption
< 0.3 W

Dimensions & Weight

W x H x D (width x height incl. feet x depth)
278 x 57 x 300 mm

11 x 2.24 x 11.81 inch
Unit weight
3.2 kg

Shipping weight (incl. packaging)
4.3 kg 
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