For Stereo playback, the DU-7i is equipped with a Fluency Digital Analogue Converter (FEDAC) that has a wonderful relaxed, analogue like delivery. It has a rich, full-bodied tone that will seduce you with its natural presentation. This is the kind of Music Player that will allow you to forget about Hi Fi and instead concentrate on re-discovering the jewels in your music collection.
The DU-7i throws a huge 3-D soundstage; the musicians are laid out in front of you so realistically, that if you close your eyes, you will feel that you can extend your arm and touch those in front..
Plays almost any 5″ optical media disk*, while the primary emphasis is on music playback, the video performance is no slouch, even the white and black levels can be adjusted separately to optimize the output of your video projector.
* (Blu-Ray & HD-DVD excluded)
With a choice of two different audio DACs and an advanced video DAC of 216MHz, 14 bit. Luxman have left nothing to chance. Features many custom parts, large R core type transformer, switching power supply for the video & digital sections, all of which are fully screened from each other. Not only does it produce beautiful video but it will captivate you with its musical performance.
Differences between the DU-50 and the DU-7i
It comes down to different levels of refinement. As you move up the Luxman chain of universal music players, the more expensive players make noticeable sonic improvements.
- Both have the Fluency & Shannon DACs on board, you can switch between the two DACs on the front panel at the press of a button. Give the players a couple of hours to warm up and the Fluency DAC is really impressive, rich tone with lots of texture. The music is beautifully fleshed out, though not smeared. The DU-50 has both DACs on the same PCB (printed circuit board), while the DU-7i has each DAC on its own separate PCB.
Cast iron-embedded wood bottom plate for resonance control and the elimination of unwanted mechanical vibration.
Leakage flux, heat generation and vibration of a power transformer are always a problem for audio engineers. Large scale R-core transformer is a unique type of core, designed and developed by Japanese engineers. These cores are manufactured in the conventional rectangular shape but the slitting is done by a special process, ensuring a high stacking factor. The special heat treatment, continuous strip and no gap ensure higher efficiency to the transformers. Further leakage flux of the transformer is very low (about 1/10th of conventional transformers), which permits the audio engineer to place the transformer close to critical electronic components, without corrupting the electronics with electromagnetic interference. The balanced winding & low leakage flux ensure low noise from the transformer.
Discrete power circuits; rather than have different circuits sharing power, with the potential to corrupt each other. By using discrete power circuits, noise levels can be kept drastically lower. Lower noise floor, leads to a higher dynamic range. Put it another way, say the music is playing at 87dB, if you lower the noise floor by 3dB, it will appear as if the music is twice as loud, even though its still playing at 87dB. By hearing deeper into the music, you now have access to details that you never heard before.
Fluency DAC (FEDAC)
In 1987 Luxman introduced the DA-07 Fluency DAC and DP-07 separate CD Transport. Fluency DAC was an application of the function interpolation theory developed by Dr. Toraichi, a professor at Tsukuba University, Japan. The DA-07 became a sensation because its high-speed DSP permitted recreation of the frequency range not recorded on a CD. The Fluency Theory not only considers the reproduction of continuous sine waves but also the reproduction of impulse waves as well. See the test response above. As processing power has increased over the intervening two decades, so too has Luxman’s ability to harness this unique technology to produce remarkably natural music.
A long standing belief was that the upper limit of human hearing was around 20 kHz. In real life, however, information beyond 20 kHz frequencies exists, and it is generally recognized that the presence of this information can significantly enhance the listening experience. While we may not hear the first order harmonic, we can hear the lower order harmonics, underneath. When a CD is recorded, on account of the limitations of the 44.1 kHz sampling frequency, the audio upper limit is restricted to 22 kHz. Using the Fluency theory and the DSP on board, permitted recreation of the high frequency range previously stopped by the brick wall filter in regular DACs. The listener finds it easier to distinguish the sounds of individual instruments, even when many instruments are playing at the same time, and the quality of recorded reverberation is significantly improved, resulting in greater realism, the sound is more relaxed and a much closer reproduction of a live performance.
The Sound of Non-Oversampling
The difference between a non-oversampling DAC and a conventional oversampling DAC with the digital filter lies whether you attach importance on the accuracy in the time domain or in the frequency domain. In other words, whether you choose the musical performance or the quality of a sound. This trade-off line defines the boundary of the current digital audio format .
A natural, stress-free sound that communicates the musicians’ intention directly to you; that is the sound of a non-oversampling DAC. The feel of this sound is closer to that of analog reproduction.
The Fluency DAC is best applied to a redbook, stereo PCM signal, namely CD or equivalent datastream, such as digital radio.
This is just one of the milestones in Luxman’s 82 year history, with many more to come. What is clear in retrospect is that Luxman products have always successfully combined the latest electronics engineering and aesthetic designs for high performance and a finely crafted look, without making any compromises.
In terms of performance, we build our products to deliver natural sound that brings a spiritual serenity to the listener. And in terms of aesthetic, we stress the interplay of light and shadow, so Luxman products present a solid, sculpture-like impression.
The merging of sensibilities and technology to give a product its unique personality, that is and always has been our philosophy at Luxman.