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發表於 2012-8-9 15:06:05
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THE MEDIA CENTER ICE 802
ICE The 802 has Backes & Müller another innovation created in Hi-Fi sector. The ICE 802 sees itself as a media center, which has a variety of analog and digital inputs. The output stages are also performed in analog and digital design. In addition to the transistor output stage, the ICE has a tube output stage 802. The loss-free volume control is particularly important for our customer-speakers, who have the models in the line series, interesting.Of course, the ICE 802 are also amplifiers or powered speakers, powered by foreign manufacturers. ICE 802 is the answer of Backes & Müller to the questions: analog or digital? tube or transistor?
ICE802 CONNECTIVITY
The ICE 802 may be connected to our powered speakers in various modes. You can select the operating mode switch plug, depending on the speaker model, even without. As the speaker of the Line series have two inputs, for example, can be connected to the analog input of the speaker tube stage of the ICE 802nd On the digital input of the speaker then close parallel to the digital output of the ICE 802nd Choose a button between the modes:
Tube or transistor and analog or digital.
ICE802 INPUT JACKS
Input 1 Analog input RCA jacks Input 2 Analog Input RCA jacks Input 3 Digital Input XLR AES EBU input 4 digital input RCA S / PDIF input 5 digital input RCA S / PDIF input 6 Digital input TOSLINK input 7 digital input TOSLINK input 8 digital input USBclock rates up to 192kHz 24 bits are processed.
ICE802 OUTPUT JACKS
Analog Out RCA output of the tube stage
output transistor analog out XLR
Digital Out XLR AES digital signal XLR
remote volume control for the
line BM 25, 35, 50, 100
VOLUME CONTROL
The analog volume control has been established for decades. Analog means that the music signal varies in its size. Accordingly, the volume is louder or quieter. The analog volume control can be accomplished very easily. A potentiometer is used.A potentiometer is a variable resistor which is dependent on its angular position to pass through "more or less" music signal. At one stage of a passive or active speaker chain can thus move the analog input.
THE CHANGING TIMES
In a digital age, new ways and possibilities of playing music emerged. The source equipment store, manage, or create music digitally. The output signal is a data stream, the amount can not be changed. It is determined by square wave signals whose bit string rather than the size of the music content.
THANKS TO DIGITAL ICE 802 NO COMPROMISE
In conventional transformers, bits, so music information, taken from the data stream to control the volume. The smaller number of bits is overlaid with a peculiar noise that our ears are not as noticeable to the dizziness. This means that the smaller the volume, the lower the resolution. Since our hearing, but just in the quieter area is most sensitive, the whole thing is a compromise. In a passive loudspeaker that does not matter, because systemic or the entire octave, and all the details of the music scene can be transferred.
OF OWN ALGORITHM
Since all input signals are present at the ICE 802 (also analog) has to be processed digitally Backes & Müller own customized algorithm developed. With the known algorithms in the market could not the superior technical specifications of the ICE 802 reach.
VOLUME CONTROL IN PERFECTION
What Backes & Müller different?
For large models BM Line 25, BM, Line 35, BM, Line 50, BM is Line 100 change the volume through the reinforcement of individual drivers in the speaker.
ie, is the digital input data present current in its word length is not reduced. He goes through the entire digital signal processing without changing the bit pattern and thus the music content.
The volume control is the same, directly to the amplifiers. The size of the gain determined by the volume of the music being played.
UNIQUE
This type of volume control is unique. Only Backes & Mueller have speakers due to their complex and sophisticated structure of the so-called VCA.
LINEAR OUTPUT TUBES
The ICE 802 in Röhrenbeschaltung sets it apart from the usual options. A conventional tube circuit principle has caused disadvantages. Depending on the gain or power, the operating points vary during operation and can hardly be kept stable. The analog tube output of the ICE 802 is selected ECC82 tubes fitted. The tube amplifier for the ICE 802 is not, as the volume passes through the upstream transistor stage. The gain of the tube is always 1 , the signal noise was with this circuit technology not since known values be reduced. the life of the tube is increased by an electronic soft start of the heating voltage.
BY TEMPERATURE
The ICE 802 of the data clock with which the converter is generated synchronized via a high-precision quartz furnace unit. Quartz furnace are normally used in the measurement equipment construction. The ICE 802 uses the same technology to bring you the best possible result for music gewähren.Im quartz furnace is the real crystal element is maintained at a constant temperature.Minimize defined temperatures in the oscillating element tolerances and in connection with a scheme for excellent Langzeitwerte.Die precision in the data clock is fundamentally important to keep the jitter as low as possible. . Jitter is variation in the frequency and amplitude, the transducer and thus affect the result negatively music
with the ICE in the 802-driven effort to jitter one thing is certain - it's not better!
dB SIGNAL RATIO IN ANALOG OPERATION
To the balanced analog outputs of the ICE 802 was a signal noise ratio of 120dB gemessen.Mit this value is the ICE 802 at the border of what is possible. The signal to noise ratio defines the threshold at which a signal can be distinguished from noise. The higher the value, the more sensitive and interference-proof, the circuit. To the specifications of the ICE 802 had been reached during the circuit design value throughout impedance matched circuit board layout are placed on a.
the ICE 802 is a six-fold (6x!) multilayer circuit board used. Only by the miniaturized multi-layer structure it is possible to keep the signal paths small.
DIGITAL WAY
The headline reads as actually contradictory.
But it's true! The ICE 802 are all signals processed digitally and the analog. to be two 24-bit analog to digital sigma delta converters 192kHz Burr Brown used. This conversion process includes a visit to a high signal to noise ratio. The digital signals are synchronized with the clock Backes & Müller's RecoverPoint and adjusted by resampling algorithm to the particular data format of digital input.
CHARACTERISTICS OF THE VOLUME CONTROL
Further ahead, the function of the volume control was explained. An important innovation in hi-fi was installed in the ICE sector 802nd here in the service center, the control characteristics of the volume control can be programmed. It makes sense to adapt for example, if you include for example, to the silent listeners. One can program the range of rotation so that larger rotational path in the lower level range for precise adjustment of the desired volume is available. Only in the upper volume range then the step size becomes larger. Conversely, listeners can also be considered sound. equipment is made possible by the 12-bit scanning step size of the volume control. The volume control has an analog "feel and touch."
OPERATING CONCEPT
Since the ICE 802 is primarily designed for use with the remote, no controls are on the front.
back side, two buttons are placed.
THE REMOTE CONTROL
The ICE 802 is a programmable remote control. This then allows additional devices for consumer electronics via MAC / PC can be recorded.
HOUSING
Foreshadows even the appearance of the ICE 802 is special inside. The innovative technical concept of the ICE 802 is enhanced by a unique optical appearance. the 3 cm thick "ice sheets" help the ICE 802 striking his design. Behind the 3 cm thick ice the lettering and illumination to see the individual inputs.
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