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3 way active speaker with 2 horns for mid and treble.
All the digital inputs.
Crossover and room adjustment implemented in DSP
The ZERO 1 is a 3-way active loudspeaker in a 2 x 50 watt and 1 x 400 watt power amplifier configuration, with each of the amplifier stages receiving a signal that is digitally filtered and then converted to analogue, amplifying it, and passing it on to the moving coil without making a detour via passive filters. This intelligent design significantly reduces driver workload, as each driver only receives the signals intended for it.
The ZERO 1 takes the digital route to eliminate passive crossovers and their analogue filter switches, thus automatically eliminating a series of tonal problems (e.g. additional components in the signal path, phase shifts and negative impulse responses).
A common challenge faced by digital signal processing is the amount of data needed to perform complex calculations. This is why the bit rate is usually reduced in conventional DSPs, resulting in rounding errors and what is known as rounding noise. The ZERO 1 solves this elementary problem with more intelligent, higher-performance FPGA processing of up to 66 bits.
Precise down to one-millionth of a second, the FIR filter provides a sensational impulse response. This means that the 3 channels (bass, midrange and tweeter) reproduce music in absolute synchronicity. Moreover, thanks to the FIR filter the ZERO 1 has perfect phase characteristics, with deviations of less than 5 degrees. By comparison, your average loudspeaker has maximum deviations of 500 to 1,500 degrees.
The ZERO 1 uses progressive steepness filters. To obtain optimum impulse characteristics, a 6 dB filter is used at the crossover point, after which it becomes progressively steeper until 100 dB. The tonal advantages run the gamut from outstanding impulse responses via an extremely strong filtering and blocking effect to the elimination of unnecessary driver strain and ringing effects.
When processing the digital signal of the music source and filtering it for the 6 drivers, the ZERO 1 operates in the digital domain—and thus loss- and error-free— for as long as possible. Only in the end does the digital-to-analogue conversion take place. Very high-value 24-bit converter chips by the renowned manufacturer Burr & Brown are used for this purpose, ensuring that the precision of the upstream signal path is maintained during the analogue conversion process.
Master and slave connections between ZERO 1 loudspeakers are wireless—eliminating the need for cables. Although this simplifies setup considerably, it is important that the wireless connection does not deteriorate the sound in any way. The ZERO 1 provides tonal perfection by transmitting the volume over a dedicated wireless channel, applying it only once it has arrived at the slave. The data transfer rate is 44.1 kHz at 16 bits and is bit-perfect. Another measure taken to achieve this is to delay the master by less than 2 microseconds in order to make up for the time needed to process the radio link. This ensures that the master and slave's musical output is absolutely synchronous.
http://www.avantgarde-acoustic.de/zero1/_en/zero-einfach.html
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