Soulution 727 PRE

Manufacturer:
Soulution
Type:
Preamplifier
Inputs:
3 × balanced (XLR) 2 × unbalanced (RCA) 1 × Phono (optional)
Outputs:
2 × balanced (XLR) 1 × unbalanced (RCA)
Amplification:
+4dB balanced (XLR) -2dB unbalanced (RCA) +44dB to +84dB (phono))
Frequency Response:
DC - 20MHz
Consumption:
0.5 W standby 60 W device in operation
Phono inputs:
1 × Phono MC (optional)
Line inputs:
THD:
less than 0.00009% (20 Hz – 20 kHz)
Signal to noise ratio:
more than 120dB
Channel separation:
130dB
Imput impedance:
4.4MΩ balanced (XLR) 4.4MΩ unbalanced(RCA) 10 – 1000Ω or 47kΩ phono (adjustable)
Output impedance:
0.8Ω balanced (XLR) 0.4Ω unbalanced (RCA)
Output voltage:
114Vpp balanced (XLR) 7Vpp unbalanced (RCA)
Output current:
1 A (limited by protection circuit)
Size:
480mm x 450mm x 167mm
Weight:
28kg

56 400,00€

About product

What a difference noise makes!

soulution’s new reference preamplifier sets new benchmarks in terms of noise, phase errors, common mode rejection and distortion.


Input stage

The innovative input stage of the727 preamplifier enables exceptional common mode rejection without compromising the input stage by introducing noise. This is achieved with parallelized instrumentation amplifiers designed for wide bandwidth (20MHz), lowest noise (noise density < -160dBV/√Hz) and optimal common mode rejection (CMMR >105dB).  This ensures that even the faintest musical signals can be properly received by the 727 preamplifier.

Volume control

Relay-switched high precision metal foil resistors form an 80 step (1 dB) volume control. Each channel has its own volume control resistor network. The volume control also allows balance adjustment. To avoid unpleasant clicking noises or harmful voltage peaks during volume adjustments, the 727 preamplifier is provided with a second volume control path which is active only during volume adjustments. This secondary, IC based volume control alters the volume without any click or pops. Once the new volume is set, the 727 will revert to the sonically superior path with its high-precision metal foil resistors.

Phono-preamplifier(optional)

Small and fine output signals, especially from MC cartridges, are received by an instrumentation amplifier optimised for lowest noise and highest common mode rejection. With its adjustable gain (+40 dB to +80 dB @ 1kHz) and termination impedance (20Ω to 1kΩ, 47kΩ, 0pF to 70pF) the phono input can be adapted very precisely to your pickup system. The use of very fast amplifier stages (-3dB @ 2MHz) ensures highly accurate reproduction of the RIAA equalization curve (frequency and phase response).

Output stage

The Class-A output stage has been optimised for speed, precision and high peak currents. Thanks to its low output resistance the output stage can drive even long cables without difficulty. With a frequency bandwidth of 20 MHz (-3 dB) and the accompanying minimal phase shift in the audio band, all details of the music are reproduced true to life. The result is a three-dimensional spatial sound experience full of musicality and natural timbres. The sheer power of the output stage guarantees that the rich detail of the music reaches your power amplifier.

Distributed Local Power Supply:

The basis for the dual mono power supply of the 727 preamplifier is a switched mode power supply (SMPS) which converts mains voltage into an intermediate DC voltage. Highly efficient DC-DC converters and extremely low-noise and fast linear regulators generate the supply voltages needed to operate the 727 preamplifier. Local linear regulators are placed next to each current sink (OpAmp, transistor, etc.). This ensures lowest noise levels on the analog supplies and shortest signal paths. Large filter capacitors, as typically used for linear power supplies with transformers and rectifiers, are no longer required.

About brand

Soulution


Soulution is owned by the Spemot corporation, a company located in the Swiss town of Dulliken. Spemot is a well-established designer and producer of electronic devices and electric motors used in automotive and other applications including professional catering equipment. The company has a strong track record in innovative bespoke solutions that meet specific customer needs.

The soulution brand for premium audio was created by Spemot’s two managing directors Cyrill Hammer and Roland Manz, both of them passionate high-end audio hobbyists. The pair are long-time Swiss distributors of the Hi-Fi & Records magazine. Having owned and heard top amplifiers produced by US and Japanese manufacturers, they resolved to lay down a challenge and build a family of audio products that would set a new and even higher benchmark.

As reviews of soulution products by audio magazines around the world testify, Hammer and Manz have achieved their goal.

Design

The outstanding sound qualities of the soulution products should also be supported by the design of housing, both visually and by their construction. Due to their size it was clear that they must integrate optimally into a listening/living room to be enjoyed not just for their sonic beauty but as well for their visual appearance. The development of the housing design was therefore carried out with the same care and professionalism as the development of the electronics. Several proposals were made which fulfilled both the technical requirements for stability and heat dissipation, as well as the design requirements.

Design Awards

The effort has paid off. The soulution products were awarded several times for its timeless and elegant design by international design juries.

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