Backes&Müller ICE 525 – Preamplifier with a Digital Phono Stage

The Backes&Müller ICE 525 preamplifier has received a built-in phono stage based on modern digital technologies. According to the developers, this approach makes it possible to achieve the highest level of accuracy even with non-standard cartridges. The company claims that the new model is capable of delivering a signal-to-noise ratio unattainable for traditional analogue phono stages. In addition, the manufacturer places special emphasis on the convenience of setup and day-to-day operation.

The digital ICE 525 preamplifier from German company Backes&Müller is now offered in a version with an integrated phono stage. The distinctive feature of this solution is that the signal from the connected phono cartridge is processed digitally, including the application of RIAA equalisation. For supporters of a purely analogue signal path, this approach may seem controversial, but B&M is convinced that vinyl enthusiasts should pay attention to the lossless digital transmission technology implemented here. According to the company, it is precisely this technology that ensures an exceptionally high signal-to-noise ratio, which is especially valuable when using MC cartridges.

Originally, the B&M ICE 525 preamplifier was developed as a digital control centre for an audio system. Its arsenal includes eight inputs: analogue RCA and XLR, as well as digital Toslink, S/PDIF and AES/EBU. A USB port is also provided. Now this set has been expanded with a phono input operating in the digital domain.

The initial stage of signal handling remains conventional: the user can select an input impedance of 100 ohms for MC cartridges or 47 kOhms for MM cartridges. At that point, however, the traditional part ends, as the signal is then converted into digital form, where all further operations, including equalisation, are carried out. This method makes it possible to achieve a high degree of processing accuracy and tailor the parameters to a specific cartridge. Settings can be saved to a memory card and, if necessary, edited manually on a computer.

According to the manufacturer, the main advantage of the digital implementation lies in the almost complete absence of noise. For MC cartridges with a 100-ohm load, an impressive signal-to-noise ratio of 103 dB is claimed. The DAC used in the unit, in turn, delivers up to 123 dB, allowing even very low-output MC cartridges to be amplified without noticeable interference or losses. The company emphasises that the ICE 525 is capable of accurately adapting to the cartridge’s output level regardless of whether a sensitive MM or a low-output MC is being used.

It is worth recalling that the equalisation standard for vinyl records was introduced by the Recording Industry Association of America (RIAA) back in the 1950s. It established a unified correction curve that made it possible to increase the useful signal on a record while reducing noise levels. All traditional phono stages are based on this characteristic. In the new ICE 525, however, the digital equalisation is said not only to follow the RIAA standard but also to take into account original curves used, for example, in the famous Neumann cutting lathes. According to Backes&Müller, this makes it possible to achieve virtually ideal phase and time-domain behaviour of the signal, a level that cannot be realised in a fully analogue circuit.

The B&M ICE 525 preamplifier is designed primarily for use with the brand’s active loudspeakers. Thanks to the proprietary B&M Easylink interface using CAT7 cable, integration with the latest models in the BM Line series has become even easier. An additional advantage is that flat CAT7 cables can be easily concealed in an interior, for example behind skirting boards.

The Backes&Müller ICE 525 is expected to go on sale in the near future. The recommended retail price of the model in Europe is €8,899.