The Backes&Müller ICE 525 is a rather unremarkable preamplifier, yet it is equipped with advanced digital technology that allows even the most unusual turntable cartridges to perform optimally. The signal-to-noise ratio of the phono stage promises to be higher than that of any analog phono amplifier. Furthermore, Backes&Müller promises a high degree of ease of use.
The ICE 525 digital preamplifier from the German company Backes&Müller (B&M) is now available with a phono input. However, the underlying phono amplifier is implemented in a highly unusual way, as the processing of the signal from the connected cartridge is performed digitally, including RIAA equalization. For some turntable enthusiasts, this will be a form of sacrilege. B&M says it is aware of this, but according to the designers, vinyl lovers should definitely give so-called “lossless digital transmission a chance.” After all, the ICE 5252 features special technology and a superior signal-to-noise ratio for MC cartridges. That calls for further explanation.
Backes&Müller ICE 525: S/N ratio of 103 dB for MC cartridges
First and foremost, the B&M ICE 525 is known as a digital control center for all sources. It features eight inputs, including RCA and XLR connections, as well as Toslink, S/PDIF, and AES/EBU. A USB port is also present, for example for a Roon server. And now, a phono input has been added that operates in the digital domain.
Why is B&M so convinced of a digital phono input? Initially, it operates conventionally. The output impedances are selectable at 100 Ohm (MC) or 47 kOhm (MM, etc.). That is standard. However, the entire signal processing and adjustment are digitized. This results in a precise configuration, individually tailored to the connected cartridge. The settings can be saved to a memory card and, if desired, even manually adjusted on a computer.
The real advantage of digital technology, however, lies in its absolutely noise-free operation. The specified signal-to-noise ratio for MC cartridges (100 Ohm) is an astonishing 103 dB. The DA converter achieves 123 dB, ensuring that even the quietest MC cartridges are amplified cleanly without loss or interference. With the ICE 525, B&M guarantees precise matching to the cartridge's output level, whether it is a subtle MC or a loud disco MM.
Backes&Müller ICE 525: digital RIAA equalization
The equalization standard for vinyl records, which is still in use today, was established in the 1950s by the RIAA (Recording Industry Association of America). This created a uniform technical standard that made it possible to press more signal onto the record and lower the signal-to-noise ratio. All phono amplifiers are based on this characteristic curve defined by the RIAA. With the digital equalization integrated into the new ICE 525, listeners now have the advantage, according to B&M's designers, that original cutting characteristics, such as those of the legendary Neumann cutting machines, served as the basis for the digital correction filters. As a result, the Backes&Müller ICE 525 Phono achieves an ideal phase and timing response during equalization, which would be unattainable with an analog circuit.
Naturally, the internal components are also exceptionally clean, with the power supply, data lines, and clock all carefully isolated.
The B&M ICE525 is naturally designed to drive the company's renowned active loudspeakers. Thanks to B&M Easylink via CAT7 cable, this is easier than ever with the latest BM Line speakers. Moreover, flat CAT7 cables can easily be concealed behind skirting boards.
The recommended retail price of the ICE 525 is just under $8,900.
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