soulution 325 preamplifier


Dynamics. Resolution. Control. Musicality.…
…All as close to perfection as possible. It’s what characterizes the soulution 325 preamplifier. Optionally equipped with a first class phono stage and/or a top notch D/A converter it converts itself to the center of your audiophile music system.


A preamplifier should only amplify or attenuate the music signal, not change it in any way. No distortion, no hum or noise, at the same time achieving the lowest cross talk and widest bandwidth. The soulution 325 preamplifier elegantly meets these demands.


Unbalanced design ensures the fewest components in the signal path. Physical separation of the left and right channel provides optimal separation and cross talk performance. High quality relays switch between the inputs. For safety, an audio grade coupling capacitor protects the preamplifier as well as downstream amplifiers and loudspeakers from potential DC-components in source signals..

Volume control

The 325’s volume control uses only high-precision, low-noise metal foil resistors, and it controls both the volume and balance. To block switching peaks during volume changes which may be hazardous to power amplifiers, the 325 is equipped with a second volume control with a PGA (Programmable Gain Amplifier). Active only during the volume control process, it is similar to a potentiometer and enables the volume to be adjusted in smooth, click-free steps. As soon as the new desired level value has been selected, the unit returns control to the precision resistors.

Power supply

A switched mode power supply and audiophile DC-DC converters with linear regulator provide the required supply voltages for the 325 preamplifier. Induction of noise is omitted by physical separation from the analog audio boards and effective shielding. Switched mode power supplies provide supply voltages that are more stable and lower in noise than other power supply technologies.


The 325 may as well be integrated in an Audio/Video system. One input can be defined as surround input. Volume and balance settings of the 325 preamplifier will be ignored for the surround Input.

Mains220 – 240 V (50 – 60 Hz)
100 – 120 V (50 – 60 Hz)
Power consumption< 0.5 W, Standby
~ 30 W, ON
Analog inputs2 × balanced (XLR)
2 × unbalanced (RCA)
1 × Phono MC (optional)
Input impedance3 kΩ balanced (XLR)
3 kΩ unbalanced (RCA)
10-1260 Ω phono (RCA)
Digital inputs (optional)1 × AES/EBU, 1 × SPDIF, 1 × USB, 1 × Network
Gain– 79 to + 10 dB
Frequency response (– 3 dB)0 – 800 kHz
THD + N< 0.0001%
Signal-to-noise ratio> 120 dB
Ouput current (Peak)> 0.2 A
Channel separation> 120 dB
Output impedance10 Ω balanced (XLR)
10 Ω unbalanced (RCA)
LINK (remote turn-on)2 x phone jack (3.5mm)
Dimensions (WxDxH)430 x 350 x 142 mm


A CD or SACD player brings both digital and analogue domains into an audio system. For the very highest quality sound every part of the player is critical. A high-quality D/A converter alone is no longer enough. The 746 unites a top quality optical drive, a super-precise master clock generator, an intelligent digital signal processor with over­sampling, and analogue output stages of the utmost quality. Together they ensure nothing in the music is lost on its way from disc to output connection.


As with its Series 7 sibling the 560 D/A-Converter is packed with cutting-edge tech­nology with one objective – the love of music. The parallels include a consistent dual mono design in the output stages and separate power supplies for digital elec­tronics and the analogue stages. The 560 D/A-Converter adds a digital volume control that allows direct connec­tion to a power amplifier.

D/A conversion

Burr-Brown devices perform D/A conversion only. Their internal upsampling and filter stages are not used. The output currents are converted to voltage and then filtered. With an internal bandwidth of 40 MHz, this current/voltage conversion stage allows best signal-to-noise performance and maximum dynamics in the analogue domain.



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