CD player metronom

After 30 years of digital reproduction of music, in 2012 the metronom made it possible to correct technically resulting errors in the digital to analogue conversion. The new metronom picks up on the experiences of its previous model and combines them more efficiently with other analog-to-digital converter chip.

metronom module

metronom high-base modules

° Channel separated double mono
° Uncompressed stereo digital signal
° TDA1540D converter in ceramic housing
° Synchronized oscillators on the TDA1540D
° Dynamic correction of the shift register
° Frequency compensation of the output stage
° Class A operation of the TDA1540D

The result of this interaction is an audible increase in spatial precision. It is no longer necessary to ask the question of deep bass registers, of nuances or transparency of reproduction - the discussion on top tonal performance is over here. Rather, new standards are set for continuity and naturalness of reproduction. Simply put, compared to the best digital playback devices, whether from CD or streaming, whether 16, 24 or 32 bits, a metronome sounds alive and authentic.

Simultaneous data format

No compression, no artifacts and no quantization errors. The simultaneous data format is an uncompromising data format for analog conversion - while all digital playback devices available on the market use the I2S data format, which compresses the stereo channels into just one signal. With the simultaneous data format, the stereo channels are processed separately and uncompressed in a separate converter chip per stereo channel. The converters do not have to re-allocate the bundled signal to the stereo channels. Stress-free, these can fulfill their actual task, plus: negative interactions, because both stereo channels are processed in the same chip, do not occur. From digital to analog output, a channel-separated dual mono setup is possible.

Digital Analog Converter TDA1540

For an analog converter that is produced without embedded filters and amplification stages, you have to use the technology of the first hour. Current chip architectures focus on industrial standards designed to reduce production costs. Converters are produced that perform a fixed static digital-to-analog conversion without repairing the resulting errors.

Dynamic conversion is only possible with a few converter chips. While the predecessor used two 16-bit converters TDA1541A, the principle of the active correction circuit metronom is now transferred to a 14-bit converter. Since this converter has a 42.86% more complex shift register structure, the TDA1540 is known for its unsurpassed natural timbre.

Active correction metronom

The converter-internal shift register, which takes over the analogue conversion of the data from the bit stream as it were as a manual transmission, is controlled by internal oscillation. Disadvantageously this happens without metronom correction with a fixed frequency and not in dependence on the received data window. Through the active metronom module on the converter, the oscillation of the shift register is dynamically adapted to the data window.

dynamic correction metronom

The oscillator and shift register in the TDA1540 can be controlled externally. A dynamic control depending on the data input, specifies the analog conversion in a new order of magnitude. The window size of the digital signal (14, 16, 32 bits) has no meaning for a realistic analog signal. The data of the original signal are supplied only in respective large blocks of data.

Digital fallacies

Why push back against 24/192? Because it's a solution to a problem that doesn't exist, a business model based on willful ignorance and scamming people. The more that pseudoscience goes unchecked in the world at large, the harder it is for truth to overcome truthiness... even if this is a small and relatively insignificant example.
Christopher "Monty" Montgomery, Xiph.Org: weblink

The Xiph.Org Foundation is a non-profit corporation dedicated to protecting the foundations of Internet multimedia from control by private interests.

Audio industry salesman have been promoting faster than optimal sample rates. The promotion of such ideas is based on the fallacy that faster rates yield more accuracy and/or more detail. Weather motivated by profit or ignorance, the promoters, leading the industry in the wrong direction, are stating the opposite of what is true.
Dan Lavry, Lavry Engineering, Washington: weblink

metronom base units

1. Revox B225

With tight-tolerance components of above-average quality. The controller shows a good functionality with direct title selection and professional special functions.

Revox B225
Revox B225 metronom, 2200 Euro
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2. Philips CD304

With its anodised aluminum front and its tube display the CD304 fits well with standard format hi-fi devices.

Philips CD304
Philips CD304 metronom, 1900 Euro
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3. Philips CD104

The CD 104 is the organ donor of the 304 and many other CD players that have crystallized in over 30 years as the best CD players of all time.

Philips CD104
Philips CD104 metronom, 1850 Euro
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4. Bang & Olufsen CDX

Inside, the CDX is very similar to the Philips CD 104. The CDX with its futuristic design is the right choice for lovers of TOP loaders.

B&O CDX metronom, 2100 Euro
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5. Philips CD204

Unlike his siblings, the CD 204 is manufactured without SMD components on the motherboards. But SMD components have advantages in some areas.

Philips CD204
Philips CD204 metronom, 1850 Euro
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6. Philips CD100

Without title jump backwards, with tough access times and idiosyncratic noise in the title jump, a CD 100 is something for real lovers.

Philips CD100
Philips CD100 metronom, 2100 Euro
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List of all suitable basic devices


Since you have done a great job! That a CD player is capable of such musicality at all I have not believed so far. After many years and many CD players was the topic for me actually "eaten"; thank you very much, that you once again opened my ears (and I am comparing here on a high level - with a Studer professional machine and master tape copies). Such unity in the musical flow and above all, such a great presentation and physicality of instruments and voices I have never heard of a digital source. The intonation is consistent, from the bass to the highs, the timbres are rich and the timing just perfect!
A. Sandreuther, Nürnberg

Out of amazement, I came out only after some time. I remembered how much money I already spent on finding perfection. In relation to the devices that used to play for rankings "recommendations" of various hi-fi gazettes, my new 304 can not compete with them - in the price! I feel like a man who always blinked and then bought a new eyeglass cleaning cloth. Suddenly, I see clearly, before it was gritty and blurry. I should have come up with this idea earlier.
Gerhardt Wengenroth, Hemer

I compared the modified CD 304 together with friends on different weekends with some other players in the price range 2500.- to 7000.- € in extensive listening sessions. I do not tend to exaggerate, so I must emphasize that the five players were not separated by huge worlds. It should be noted, however, that the CD 304 was audibly superior to other players in almost every musical material in terms of the closedness of the sound, the clarity of the orchestra and voices, the fidelity and precision of the other players. Last but not least, the freedom from fatigue is to be praised. You can hear for hours with the 304, without any sign of acoustic stress.
Hans-Peter Storz, Freiburg

After unsuccessful attempts to get a "stuck drawer" and the flickering display of my Philips 304 repaired by two "experts", I came across you via internet research. The Philips is now running properly and makes me happy - thank you very much. Also in the communication, I noticed that you standing out from the chatter of self-appointed specialists.
Hannes Scholten, Stuttgart

Founder of HiFi magazine Audio and former editor in chief Stereoplay