La salle multimédia s'est réalisée grâce à vos cadeaux de mariage
Merci à toutes & tous.
Voici le matos qui est installé
| Matériel | Marque |
| Ampli-tuner-video | DENON AVR-3801 |
| Colonnes | 2 x
JBL XTI 80 1x XTi 10 Center 4x XTI 20 |
| Subwoofer | 1x INFINITY Alpha Sub |
| DVD | Thomson DTH 2500 |
| Projecteur Vidéo |
Epsom EMP-50 |
| VHS | Toshiba V830-EF |
| Satellite | Parabole 80cm avec 2 Tuners digitaux |
| Dossiers Techniques FNAC |
Sa présentation est conventionnelle, 17 cm de hauteur, 17 kilos, le Denon AVR-3801 est capable aujourd'hui de décoder tous les formats sonores du moment et intègre pas moins de sept amplificateurs complètement indépendants. La façade ne comporte que l'essentiel avec un affichage très complet en face avant et une télécommande très pratique avec son joystick. Sur la partie droite en retrouve le traditionnel gros bouton de volume à commande sans fin. Les borniers pour les enceintes sont de très bonne qualité.
Le Denon AVR-3801 est très convivial et polyvalent en terme d'enceintes. La navigation dans les menus reste simple et la télécommande très conviviale.
Coté connectique rien à redire, c'est le top. On y retrouve trois entrées audio de type RCA avec une sortie RCA, cinq entrées Audio/vidéo complétées S-Vidéo avec trois sorties du même type. Coté numérique quatre entrées dont une coaxiale et trois optiques et une sortie optique. Il ne faut pas oublier deux entrées YUV et une sortie YUV mais aussi une entrée/sortie 5.1. Le Denon AVR-3801 dispose une fonction multi room remarquable (2 des 7 amplificateurs (les surrounds back) étant réservés à cet effet si dans la pièce principale on se limite à du 5.1). C'est très bien pensé même si je considère le multi room comme du gadget.
Tous les modes d'écoute sont présents, de la stéréo, en passant par le Dolby Pro logic, puis en mode 5.1, le Dolby Digital, le DTS, pour finir le Dolby Digital EX le DTS ES Matrix 6.1 (1 canal arrière matricé), le DTS ES Discrète 6.1 (7 canaux complètement indépendant), le DTS Néo 6 (avec trois DPS DTS Néo 6 Surround, DTS NEO 6 Cinéma, DTS Néo 6 Music).
A noter aussi que dans les modes 6.1 avec un DVD 5.1, la canal supplémentaire est synthétisé.
Coté fabrication, l'architecture interne est très rigoureuse. Un microprocesseur 32 bits SHARC d'Analog Device assure le décodage des signaux sonores et des DSP. Les convertisseurs travaillant sur 24 bits 96 kHz. Coté amplification le Denon AVR-3801 possède sept amplificateurs identiques. L'étage d'amplification ayant été calculé pour donner beaucoup de puissance instantanément mais moins en continu (il faut bien de distinguer de son grand frère !!), bien que cela reste dans la moyenne.
Coté restitution, le Denon apporte plein de chaleur, de dynamique. On aurait aimé des étages d'amplification avec un peu plus en capacité de courant continu ce qui aurait encore donné plus de profondeur à l'écoute. Les timbres sont de toute beauté, le médium fluide et le grave ferme. Le mode stéréo direct nous fait voir que l'on a affaire à du Denon et une électronique de grande classe. Le mode DTS néo apporte sur certains enregistrement un véritable plus sans dénaturer la musique. En mode 5.1 on retrouve le même dynamisme, une grande précision dans le décodage avec une très bonne séparation des canaux. Lorsque tous les amplificateurs sont utilisés, on ressent une scène sonore à 360° mais il ne faut pas trop pousser l'amplificateur car les étages de sorties auraient tendance à s'écrouler un peu.
Décodage Dolby Prologic, Dolby Digital et DTS, Dolby Digital EX, DTS ES Matrix et Discrète, DTS Néo 6
Puissance continue sur 2 canaux: 2 x 120 W sur 8 Ohms
Puissance impulsionnelle sur 2 canaux: 2 x 146 W sur 8 Ohms
Puissance continue sur 5 canaux: 5 x 77 W sur 8 Ohms
Puissance impulsionnelle sur 5 canaux: 5 x 125 W sur 8 Ohms
Puissance continue sur 7 canaux: 7 x 41 W sur 8 Ohms
Puissance impulsionnelle sur 7 canaux: 7 x 121 W sur 8 Ohms
Réponse en fréquence 10 - 100 kHz
Rapport signal bruit: 102 dB
Poids: 17 kg
Dimensions: 434 x 171 x 416 mm
Pour moins de 10000 Francs français, nous avons un ampli-tuner très perfectionné, c'est ce qui e fait de mieux en décodage 6.1 avec 7 amplificateurs. la qualité audiophile Denon est au rendez-vous. Dans sa catégorie c'est le numéro un incontestable.
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Dynamique exceptionnelle et absence de résonances |
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Ébénisterie haute densité hexagonale |
3 voie, 2 boomer de 17cm | |
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Filtre passif " composants audiophiles " |
Bande passante : 40 Hz à 22 kHz | |
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Finition en placage bois veiné |
Sensibilité : 89 dB | |
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Tweeter en titane |
Impédance : 6 Ohms | |
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Bornier vis plaqué or |
Puissance Ampli : 10 à 200 Watts | |
| Dimensions : 1000x231x312 | ||
| Poids : 19 Kilos | ||
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Dynamique exceptionnelle et absence de résonances |
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Ébénisterie haute densité hexagonale |
2 voie, 1 boomer de 17cm | |
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Filtre passif " composants audiophiles " |
Bande passante : 60 Hz à 22 kHz | |
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Finition en placage bois veiné |
Sensibilité : 87 dB | |
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Tweeter en titane |
Impédance : 6 Ohms | |
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Bornier vis plaqué or |
Puissance Ampli : 10 à 100 Watts | |
| Dimensions : 382x277x3008 | ||
| Poids : 7 Kilos | ||
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Dynamique exceptionnelle et absence de résonances |
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Ébénisterie haute densité hexagonale |
2 voie, 2 boomer de 13cm | |
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Filtre passif " composants audiophiles " |
Bande passante : 70 Hz à 22 kHz | |
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Finition en placage bois veiné |
Sensibilité : 89 dB | |
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Tweeter en titane |
Impédance : 6 Ohms | |
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Bornier vis plaqué or |
Puissance Ampli : 10 à 100 Watts | |
| Dimensions : 197x510x258 | ||
| Poids : 7 Kilos | ||
INFINITY'S REPUTATION AS A TOP-CLASS SPEAKER MAKER IS BEYOND DOUBT. BUT THE ONGOING CHALLENGE IS TO ESTABLISH DESIGN AND TECHNOLOGY PARAMETERS THAT PUSH THE ENVELOPE OF EXCELLENCE EVER FURTHER. THE NEW INFINITY ALPHA RANGE ACHIEVES JUST THAT...
IT all started when three audio enthusiasts pooled their extensive expertise in the fields of aerospace engineering, materials technology and high-tech physics, coupled with a shared passion for music and hi-fi.
The year was 1968, and in a Los Angeles garage, this trio started creating loudspeakers that would soon be acknowledged as among the world's finest. More than three decades later, Infinity remains at the forefront of loudspeaker design and manufacture, with a reputation for excellence and innovation that has never been stronger.
The all-new Alpha Series loudspeakers is the epitome of Infinity's continuous striving towards loudspeaker designs that break new ground in terms of both advanced design and ultimate performance. After all, technology can only be of relevance if it can be translated into performance standards that represent real-life, tangible performance improvements.
In the case of the Alpha Series, those improvements have indeed been achieved, but in the vital context of affordability. The Alpha Series line-up embraces technologies originally developed for Infinity's much more expensive ranges, and now applied in an altogether more price-friendly context.
However, the greatest achievement of all has been Infinity's ability to make this technology accessible to a broader hi-fi and home theatre audience without compromising the sonic benefits on offer.
Thus, the Alpha Series features Infinity's proprietary Ceramic Metal Matrix Diaphragm (CMMD) technology, previously available only on high-end designs such as the Intermezzo and Prelude MTS speakers.
CMMD is at the core of the exceptional price/performance ratio offered by the Alpha Series. It addresses one of the key fundamentals in speaker design: the flexing of the driver diaphragm. In conventional driver designs, the flexing of the diaphragm is one of the primary sources of distortion.
Infinity claims that a normal mid/bass driver typically operates in a highly resonant break-up mode across most of its frequency range. The result is an undesirable modification of the way voices and instruments are portrayed.
Designers attempt to address this problem by, for instance, introducing additional damping. But while this may address the primary problem, it generally introduced secondary flaws, such as compromising low-level detail and the driver's ability to respond rapidly to dynamic transitions.
Instead of trying to find solutions to an inherently flawed design, Infinity tackled the problem by designing an all-new diaphragm material which, from the outset, was aimed at providing key attributes such as near-perfect, flex-free pistonic motion to negate resonance.
That material is CMMD, and is a feature of all drivers in the Alpha Series line-up.
A closer look at Infinity's CMMD drivers reveals that this high-tech material features a constrained layer sandwich construction formed by bonding a ceramic compound which Infinity calls alumina to both sides of an aluminium diaphragm.
Alumina, Infinity claims, is three times stiffer than titanium and 85 times more rigid than paper, and provides the driver with the necessary strength, while the low-density aluminium core contributes to shatter resistance.
The CMMD technology is applicable to both tweeters and mid/bass or bass drivers. In the case of the former, its superior stiffness and inner damping is superior to conventional metal dome tweeters by moving resonance well beyond the audible range.
As far as mid/bass and bass drivers are concerned, employing CMMD offers a consistent pistonic movement throughout the frequency range, so that coloration due to cone break-up is eliminated, while distortion is also substantially decreased. The result, Infinity says, is a much-improved resolution of fine detail, and sonic consistency from very low to very high frequencies.
To optimise the performance of the new CMMD drivers, Infinity's designers also addressed the enclosure design of the Alpha Series.
With the focus on reducing panel vibrations, which can often lead to a 'boxy' sound and muddied detail, the designs for the Alpha Series prescribe massively thick 25 mm front baffles to ensure a solid mounting platform for the CMMD drivers. In addition, all enclosures in the range are constructed from high-density MDF.
Edge reflections are addressed by contouring the edges of the front panel, allowing the penchant for detail and resolution so inherent to the CMMD driver design to shine through to best effect. Thus, the Alpha speakers also score in terms of imaging and focus.
For loudspeakers in this price class, the attention to quality construction detail is impressive. Finish choices include beech, cherry and black ash, while gold-plated binding posts and extensive magnetic shielding are common to the full range.
The Alpha Series line-up embraces stand-mounted and floorstanding models, as well as centre channel-specific designs. Designed from the outset to cope with the dynamic demands of home theatre applications, these speakers are as at home in a full-scale home cinema as they are in a stereo role.
This versatility is expressed in the six-strong model line-up, including a dedicated centre channel speaker. The most affordable (and compact) member of the Alpha family is the Alpha 10. Described as a high-performance miniature, it's specifically suited to stereo applications in smaller rooms, or in a surround/effects role in home theatre applications.
Measuring only 320 x 180 x 260 mm (HxWxD), the Alpha 10 employs a 130 mm CMMD mid/bass driver linked to a 25 mm CMMD tweeter in a bass-reflex enclosure with a front-firing port. An easy-to-drive 88 dB sensitivity is linked to a frequency response of 60 Hz to 22 kHz at a nominal impedance of 8 ohms. Recommended input power is 10 to 80 watts.
Next up the Alpha Series ladder is the Alpha 20, a cutting-edge interpretation of the classic two-way bookshelf speaker. Measuring 385 x 220 x 280 mm (HxWxD), it matches a 170 mm CMMD mid/bass driver to a 25 mm CMMD tweeter, boasts a 60 Hz to 22 kHz frequency response and a nominal impedance of 8 ohms.
With a rated sensitivity of 89 dB, it will cope with inputs of between 10 watts and 100 watts, and focuses on top-quality sonics. Dual binding posts for bi-wiring purposes are standard.
The Alpha 30 is the first of the floorstanders in the range, and ups bass response thanks to the larger, 850 x 220 x 20 mm enclosure. It uses the same driver complement as the Alpha 20, but frequency response now extends from 52 Hz to 22 kHz.
Sensitivity remains at 89 dB, as does the 8 ohm impedance, while recommended input power also remains at 10 to 100 watts. A dual set of gold-plated binding posts is fitted to allow bi-wiring.
The Alpha 40 is a three-way design featuring four drivers - the familiar CMMD 25 mm tweeter, a 130 mm CMMD midrange unit, and twin 170 mm CMMD bass units. At 900 x 220 x 320 mm, the enclosure is taller and deeper than the Alpha 30, but still looks slim and elegant.
A true three-way design, the Alpha 40 reaches down all the way to 45 Hz, offers an easy-to-drive 91 dB sensitivity and 8 ohm impedance, and is suitable for use with amplifiers delivering between 10 and 150 watts per channel. Again, dual binding post sets are standard for bi-wiring purposes.
At the top end of the Alpha Series speaker range is the Alpha 50, offering the listener the full power and scale of the original performance. A three-way design, it measures 1 000 x 25 x 350 mm, and incorporates four drivers: the familiar 25 mm CMMD tweeter, a 130 mm CMMD midrange, and dual 200 mm bass drivers.
Quoted frequency response for the Alpha 50 is 34 Hz to 20 kHz, with a sensitivity of 91 dB and a nominal 8 ohm impedance. It will cope with input power of up to 200 watts, while dual gold-plated binding post sets allow bi-wiring for optimum performance.
Finally, the Alpha Centre is a dedicated centre-channel design aimed at those employing a full Alpha Series-based home theatre speaker system. Perfectly voice-matched to other models in the range, it consists of dual 130 mm CDDM mid/bass drivers horizontally arranged, and framing a central 25 mm CDDM tweeter.
The Alpha Centre has a 55 Hz to 22 kHz frequency range and with the rated sensitivity at 89 dB, is easy to drive. Like the other Alpha speaker models, it is fully magnetically shielded, and measures 168 x 415 x 220 mm.
Aesthetically, the quality veneers and black cloth grilles will suit most décor themes, although the eye-catching drivers are good enough reason to remove the grilles. The slim dimensions ensure that even the larger Alpha models never appear too obtrusive or overpowering.
With the new Alpha Series loudspeakers, Infinity has shifted the goal posts a significant step forwards, bringing high-quality stereo and home theatre performance into a more affordable realm, and proving that advanced technology and leading-edge performance can be associated with top-notch value, too.
