German

Technology

RiCom V-Tweeter

The combination of the small, light titanium membrane with the very powerful, ring-shaped neodymium magnet preserves the fine nuances of all overtones while broadening the frequency range to 50 kHz — ideal for Blueray, SACD and DVD audio.

Excerpt from STEREO 1/11, PLATINUM M3 about the RiCom-M (predecessor of the RiCom V-Tweeter)
“... The tweeter sparkles and it is neither annoying nor even acute and its finely resolved clarity and quick response makes both the coarse as well as the fine dynamics extremely impressive.
It leaves a pair of more expensive rivals quite a way behind.”



RIBBON TWEETER

The new ribbon tweeter, which was explicitly developed for the CHROMIUM STYLE, stands out for its lowest distortion and a fascinating fine resolution. This is the result of intensive development work. quadral engineers combined a sophisticated ‘folding’ design in the diaphragm with an extremely strong neodymium magnet and an exchanger with a high-current sintered ferrite core. The result leaves no questions unanswered and the CHROMIUM STYLE becomes a true highlight.

SUPER AUDIO TWEETER

quadrals super-audio-tweeter delivers finely detailed highlights at high frequencies. The sound-absorbing material behind the fabric dome prevents the reflections from influencing the membrane from the rear. The true feature is the extremely small diaphragm mass which enables a break frequency of 35.000 Hz. The resulting fine resolution works with the requirements of the contemporary SACD and audio-DVD.

Runtime correction

In virtually all conventional center speakers, the tweeter is located between two low-midranges; the result is that a well-balanced sound is only heard if the listener is positioned directly facing the axis formed in this way. Sitting laterally to the tweeter axis means a considerable loss of acoustic pressure in the presence range (between 1 kHz and 4 kHz), and voice reproduction is not the only aspect to be audibly impaired.

Most manufacturers simply accept these restrictions with a shrug, whilst a few counteract them with a fourth chassis - a mid-treble unit - positioned below the tweeter. But all this does is to shift the problem from horizontal to vertical level, i.e. the center speaker may no longer simply be positioned on top of or below the TV set, but rather exactly at ear level, for example tilted, in order to obtain a decent sound. And that is certainly a rather questionable compromise.

quadral has quite consciously taken a different path here: delay or phase control in the crossover network ensures that the inevitable drop of acoustic pressure in the presence range is far less marked than customary - and hardly even verifiable in the vertical axis. quadral center speakers do not therefore need to be aligned to suit listeners sitting to the side of them, nor do they have to be aligned to ear level in order to sound clear and well-defined throughout the listening area.

The thick line shows the axial frequency response of the ARGENT BASE Mk ll, whilst the thin line shows the acoustic pressure curve 30° lateral to the main axis. The dotted line shows the area in which conventional center speakers lack volume.

Soft clipping and peak-limiter

Overloading or overmodulation are usually prevented by restricting the volume input level via limiters. Conventional limiters function similarly to an elastic band attached to a ball and prevent it from slamming against, for example, a wall, thereby averting hard impact or even damage. However, this rubber band has an effect on every movement of the ball, not only on the larger ones. A limiter acts in the same way, which means that a subwoofer fitted with a limiter will sound slightly woolly or even distorted, even if they effectively counteract extremely high input levels.

In direct comparison, this "softening" of the basses is most certainly audible. For this reason, quadral always prefers to use soft clipping protection circuitry. Soft clipping acts more like an elastic wall that reduces - or cushions - the ball's impact in order to prevent any material damage.

This has now been supplemented by a peak limiter, developed by quadral and extremely sophisticated in its concept. This does not intervene until the electronic and bass chassis have actually reached the limit of their capacities conventional systems already intervene before that point. Consequently, the basses generated by quadral subwoofers can be relied on to remain crisp and clean, despite the fact that any overloading - accompanied by hard distortion - is optimally prevented.