AVANTGARDE ACOUSTIC

 
 



The DUO–series is the most significant product line within the Avantgarde AcousticTM portfolio. The 27 inch spherical midrange horn is a stringent symbiosis of low 170 Hz cut–off frequency, size and performance.

All horn drivers are equipped with Omega voice coils. With this high impedance technology we improve the interaction of mem- brane movement and amplifier signal, to realise the full potential of the spherical horn technology. The result is 18 ohms imped- ance combined with 107 dB system sensitivity – likely the highest figures in any production speaker.

Using Avantgarde Acoustic ́sTM CDC–technology, we precisely align the frequency response, sensitivity of the driver, the geometry
of the membrane and the air chamber at the horn throat to the response curve of the spherical midrange horn. This way the midrange driver has no passive filter components in the signal path – routing the music signal directly to the voice coil of the driver engine. Less components, less interactions, less friction ensuring more detail.

The tweeter of the DUO XD series is equipped with the patent pending Capacitor–Polarization–Circuit to bypass the structural limitations of capacitors. By applying a polarization current to the conductors of a custom designed capacitor, we managed to eliminate the physical phenomenon known as “dielectric memory effect”.

The active subwoofer SUB231 XD Series supplements the balance between spherical horn performance and low frequency reproduc- tion. It is actuated by two 12 inch long–excursion drivers powered by a 1.000 Watt amplifier.

Frequency control in the low frequencies is managed by an ad- vanced digital sound processor. The digitally controlled frequency crossover ensure a seamless integration of the bass response
to the spherical horns. The DSP is equipped with 10 parametric equalizers to fine control the sound to the customers taste and to the acoustics of the room.

 


                                                        All New XD DUO

                                                    Nothing like the G2.

SPEAKERS

UNO XD

DUO XD

DUO MEZZO XD

DUO PRIMO XD

TRIO XD

TRIO CLASSICO XD

BASSHORNS XD



ELECTRONICS

ELECTRONICS XA



THE CDC SYSTEM


CDC stands for “Controlled Dispersion Characteristic“. It is a tech- nology developed by Avantgarde AcousticTM to precisely align the frequency response, the sensitivity of the driver, the geometry of the membrane and the air chamber at the horn throat to the re- sponse curve of the spherical midrange horn. This way we manage to avoid any passive filter components in the signal path – routing the music signal directly to the voice coil of the driver engine. Less components, less interactions, less friction ensuring more detail.


This is how CDC works: the lower cut-off frequency of a horn loud- speaker is determined by the size of the horn. The larger the horn, the lower the response. Below the cut-off frequency of the horn, the response falls off steeply at 12 dB/octave. The midrange drivers 6 dB roll-off is set to exactly the same frequency thus achieving a total of 18 dB/octave bottom end attenuation. Avantgarde AcousticTM speakers thus operate only down to their cut-off frequency limit and require no high pass filters.


The upper frequency response is determined by the driver itself. However, it can as well be influenced acoustically by the horn. For this purpose, Avantgarde AcousticTM places a small chamber be- tween the driver’s membrane and the horn throat. The driver does not emit directly but via a small air chamber into the horn throat opening. This air volume operates as a low-pass filter and auto- matically filters frequencies above the resonance volume of the chamber (at 6 dB/oct.)


Avantgarde AcousticTM now matches the -6dB roll-off point of the midrange driver to exactly the same frequency of the CDC air chamber. Thus we obtain an acoustic attenuation of the frequency response of 12 dB without any passive frequency crossover. No further low pass filters are necessary! The CDC system thus causes the midrange to only operate within its operational band and steeply fall off at the transition points.


THE HORN FUNCTION



The shape of the Avantgarde AcousticTM horn curvature is precisely determined by means of complex mathematical algorithms. The aim is to have a totally controlled motion of the soundwave from the beginning of the horn all along to the horn mouth. The precise spherical curvature of the horns ensures that no soundwaves are reflected back into the funnel. This results in a linear sound wave emission and well-controlled directivity along the entire frequency range of the spherical horn.