PNicolas a écrit:-Port Ellen 25 ans terminé en fut de porto
-highland Park 40 ans
tu nous fais goûter ça quand ?
PNicolas a écrit:Pour ce qui est du caisson j'y connais que pouik
je crois que BPhil recommandait chaudement les Velodyne pas plus tard que cette semaine...
Dans la série DDS, chère, mais bon, avec des Parsifal
il y à l'air d'avoir ce qu'il faut... leur argumentaire fait envie, et semble pouvoir répondre en grande partie aux besoins de Marc...
(je cite, l'URL renvoyant vers la page d'accueil)
...
Concepts and Goals
The first major challenge to accurate subwoofer performance is overcoming room response characteristics. Peaks and valleys in frequency response are inherent in every room, and are amplified by the high energy needed to recreate bass frequencies. To reproduce bass accurately, these room anomalies must be corrected.
And of course, any good subwoofer should have high definition to create realism, low frequency extension to or below 20 Hz for authoritative bass you can feel, and excellent attack to ensure plenty of excitement. Due to shockingly high distortion, most subwoofers sound muddy, boomy and unrealistic due to their severe lack of definition and clarity, especially at higher output levels. Velodyne's first goal has always been to limit distortion and deliver the most accurate bass possible.
Room Management Technology: Digital Drivetm
The Digital Drive Series subwoofers feature Velodyne's new, revolutionary Digital DriveTM room management technology that takes subwoofer room equalization to a new level. This latest Velodyne innovation allows the subwoofer's frequency response in any room to be measured using a calibrated microphone (supplied with all DD models), viewed on any standard TV in graphical format, digitally corrected using an on-board 8 band parametric equalizer, and the corrections stored in the unit's memory to assure ideal performance in any room environment. The Digital Drive subwoofer comes complete with a microphone, cables, and remote - no other equipment is necessary.
In addition to the EQ room correction, Digital Drive subwoofers also offer complete control over crossovers (both subsonic and low pass), slopes, phase, and polarity. The units also come preprogrammed with four listening mode "presets" for Action Adventure, Movies, Rock/Pop, and Jazz/Classical. There are also Custom, and EQ Defeat presets. Each preset can be totally customized for crossovers and phase, and they feature an "extra" equalizer, volume differential from system volume, and a "theater/music" setting that allows the sub to play louder (e.g. for movies) or tighter (e.g. for music) depending on the source content. The Theater/music selection by preset is another of the many firsts in the Digital Drive series.
Control Technology: Digital High Gain Servotm System
Velodyne engineers further increased the accuracy and lowered the distortion of the Digital Drive Series by including the latest generation of Velodyne's exclusive and Digital High Gain ServoTM control system. Velodyne's patented Digital High Gain ServoTM technology uses a proprietary sealed digital accelerometer to measure, compare and control cone movements 16,000 times a second in order to correct for any distortion. This provides the highest definition and lowest distortion (as low as .5%) available. The result is the ultimate in subwoofer accuracy and impact.
Amplifier Technology: The Digital Energy Recovery Amplifiertm
Conventional (Class A/B) amplifiers convert under 40% of the energy they draw into output, making them too inefficient to generate the tremendous power needed for a truly high performance subwoofer. Velodyne's patented Energy Recovery AmplifierTM, a transformer-less Class D Digital design, is the most efficient audio amplifier ever built. At better than 95% efficiency, it is limited only by the power it can draw from a wall outlet! Using 1250 watt RMS (over 3,000 watts of Dynamic power) Energy Recovery AmplifiersTM , the Digital Drive subwoofers, incorporate more usable power than any subwoofer in history except Velodyne's own Signature 1812TM.
Driver Technology: Dual Tandem Voice Coil and Kevlar-Reinforced Cones
The high technology drivers used in the Digital Drive Series subs provide extremely high power handling with less than half the distortion of conventional designs, even before the Digital High Gain ServoTM System is engaged. These innovations center on the driver's revolutionary Dual Tandem Voice Coil. The coil is actually two large 3" voice coils wound around the same high-strength fiberglass former (voice coil chassis). Surrounding the Dual Tandem Voice Coil is a gigantic magnet structure consisting of two separate magnets whose magnetic fields oppose each other. The result is much lower distortion, which results in much greater definition and detail. The huge motor structures and voice coils also allow these high-tech beasts to do much more work and handle much more power than other designs. In addition, all the drivers feature incredibly light, stiff, low resonance Kevlar-reinforced cones, custom designed variable thickness EPDM surrounds and unique die-cast aluminum baskets.
(fin de citation - copyright Velodyne
www.velodyne.com)