Dali Rubicon 6 C are active systems, each of which has two amplifiers operating in class D, with a power of 250 Watts each. The organization of the crossover filter implies the presence of a digital active crossover, apparently activated at a frequency of 800 Hz, as well as a traditional analog filter at frequencies of 2.6 and 14 kHz. That is, we are dealing with a hybrid circuit in which a digital crossover is used in the most energy-intensive part of the range, namely in the low frequencies. At the same time, the time-tested Rubicon filter continues to work at medium and high frequencies. The company does not disclose all the details, but this particular scheme seems to be the most correct and logical.
The drivers used are the same as in the regular Rubicon series, that is, branded speakers with diffusers made of cellulose reinforced with wood fibers are responsible for the bass and midbass. The magnetic system uses a core made of proprietary material SMC (Soft Magnetic Compound), which we have already talked about many times in our articles. This is a soft magnetic material consisting of many miniature balls, each of which is coated with a special composition that ensures their tight adhesion to each other. Its use makes it possible to achieve better temperature stability at high power levels, as well as reduce the level of hysteresis and stray currents in the magnetic system. The diameter of the speakers used in the model is 165 mm.
The high-frequency hybrid module is also traditional for Dali and consists of a dome tweeter with a diameter of 29 mm and a ribbon driver that operates at the highest frequencies – from 14 kHz. The housing of the speaker systems is divided internally by partitions so that each of the bass and midrange speakers works at its own volume. The bass reflex port is located on the rear wall and is installed exactly opposite the woofer; its tuning frequency is 36.5 Hz, which is clearly lower than the resonant frequency of the woofer. There is only one physical interface for connecting the source; it is made on RCA connectors and involves receiving an analog signal, which then goes to an ADC built on a BurrBrown PCM1796 chip. It sends it further to the processor, amplifiers and wireless module, which transmits the signal to the other speaker of the pair in 24-bit / 96 kHz resolution. At the bottom of the front panel of the case there is a strip with LED indicators showing the signal level during system operation.
The Dali Rubicon 6 C wireless floor-standing speakers include a Sound Hub module, which is used for receiving and switching both wired and wireless signal sources, as well as for direct music streaming from the network. So, in essence, when you buy a pair, you are buying a complete stereo system. It operates using its own wireless protocol at a frequency of 2.4 GHz or 5.8 GHz, which is selected automatically depending on the location of the system components and the quality of the connection. The signal is transmitted in the I2S format with a width of 30 bits, the “extra” four bits of which are used to control the volume, recognize connected speakers and other service functions.
The rear panel of the Dali Sound Hub has a full range of inputs, including digital optical and digital coaxial, as well as analogue RCA and 3.5mm mini-jack. Digital inputs are capable of accepting signals with parameters up to PCM 24 bit/192 kHz. The DALI Sound Hub’s wireless capabilities include Bluetooth with AAC and aptX HD support, as well as multiroom support via the included Dali BluOS NPM-1 expansion module, which is slotted on the rear panel. With its help, the buyer gets access to full network functionality, as well as his favorite music services through the Bluesound application.
There are several views on what wireless speaker systems should be like today. Of course, the main driver of the market is portable speakers, since the ability to receive a signal “over the air” is vital for them. On the other hand, the signal quality when transmitted via Bluetooth inevitably suffers, even when using the most advanced modern aptX and aptX HD codecs. Therefore, for a high-level home system, the only choice is to work via Wi-Fi, or even better – using its own proprietary wireless protocol. This is exactly how the Dali Sound Hub works complete with the Dali Rubicon 6 C.
For music lovers familiar with the style of the Dali Rubicon series speakers, the sound of the system will not come as a surprise – a transparent and well-detailed high-frequency range is organically combined with an airy and very believable midrange, which perfectly conveys not only the smallest touches of the instruments and voices, but also the emotional component of the recordings. A pleasant surprise was – although quite expected, based on the design – the pressure in the low-frequency range created by the system. The active digital crossover combined with 250 Watts in Class D allows the speakers to produce truly fierce bass on suitable electronic music recordings, and rock music also sounds as it should.
Let’s be honest – if you can get such a bass out of passive Rubicons, it will be a very expensive way. As for the quality of signal transmission over the air, any concerns in this regard are unnecessary. If you are not a staunch supporter of analog audio, and the bulk of your collection consists of CDs and high-resolution files, the capabilities of this system are more than enough to adequately reproduce them.
Characteristics of Dali Rubicon 6 C
Frequency response, Hz – 37 – 30,000
Number of bands – 3 (LF – 1 x 165 mm, MF – 1 x 165 mm, HF – 1 x 29 mm, 1 x ribbon driver)
Crossover frequencies, Hz – 800, 2,600, 14,000
Acoustic design – bass reflex
Power of built-in amplifiers, Watt – 2 x 250
Wireless module – I2S (2.4 and 5.8 GHz)
Dimensions of one speaker, mm – 900 x 200 x 380
Weight of one speaker, kg – 20.8
Characteristics DALI BluOS Sound HUB
Inputs 2 optical, coaxial, 2 analog (RCA, mini-jack)
Chromecast Chromecast Ready
Additionally USB for powering external devices, 2 slots for expansion modules
Stereo line outputs, to subwoofer (RCA)
Bluetooth aptX , aptX HD
Wireless transmission 24 bit / 96 kHz
Dimensions (WxHxD) 300 x 76 x 213 mm
Weight 1.6 kg