Paire d'enceintes en Kit Visaton NOBOX BB
[5989] Avis/Critiques KIT DIY, prix affiché pour les accessoires de 1 enceintes acoustiques.
Enceintes acoustiques en kit, le kit comprend les haut-parleurs, les câbles, les matériaux d'amortissement, les vis de fixation, les borniers de connexions, filtres passifs...
Enceintes 2 voies avec haut-parleur de basse BGS40 (15"-40cm), le large bande 20cm Visaton B200
Characteristics and sound properties
The NoBox BB unites a number of preferences in a single concept: it achieves the directness of a full-range loudspeaker, in particular in the voice range, and also manages to produce powerful, stable bass without having to fill the room with hardware.
The B 200 6 Ohm is used in the NoBox BB together with a 38 cm BGS 40 8 Ohm woofer in an open baffle as a dipole. The electric separation between the two drivers is low enough (250 Hz), which enables the full-range speaker to make full use of its capabilities and the BGS 40 8 Ohm is effectively the supporting woofer. The BGS 40 8 Ohm is a musician's driver with high sensitivity and can, as a result, easily be adapted to the B 200 6 Ohm without giving anything away in terms of mean sound pressure.
Despite the baffle being open, which theoretically causes an acoustic short circuit in the bass range, the system produces a dynamic low bass output down to 32 Hz (-10 dB). One reason for this is that the baffle is cut off from the floor and so no acoustic short circuit can take place in this direction. In addition, the side panels of the cabinet, which are mainly for stability, increase the acoustic distance travelled.
Extract from Stereoplay
"What a surprise! These NoBox speakers are devilishly good. The treat we were offered in our editorial offices left even the most hardened professional testers open-jawed. Although the test results promised us a treat, none of us had really expected to hear such deep, clearly defined and crisp bass. Not once did we feel there was anything missing in the bass department."
"But it is not just the bass that makes this construction stand out - it is more the phenomenal B 200 wide-range speaker which, freed from the restraints of a cabinet, excels beyond compare."
The impression the sound makes is one of freedom and independence with a bass quality which is so good that the lack of sub-double bass is not perceived as a detraction. What really made us sit up and take notice is the unique combination of spatial separation and the phenomenal clarity of the sound picture. The overall impression these NoBox speakers make is less an overbearing, special-effects one than one of unbelievable coolness. The music is simply there, unpretentious and unobtrusive with sufficient objectivity and yet straight to the heart. Brilliant, this has given us a completely new set of impressions from the field of music."
Extract from Klang & Ton Visaton, the only remaining large-scale manufacturer in the German DIY market, has brought together two audiophile concepts here: The NoBox is a combination of the 20 cm full-range driver and 40 cm dipole bass speaker.
In the listening test, the NoBox came out tops in its clear reproduction of the upper frequencies and treated us to far more detail than a speaker without a tweeter should do. The voices were in 3d - in the room with us - and the voice reproduction was absolutely first-rate. The lower-range sound was equally astounding: while we were expecting relatively thin but precise bass ripples we were met by powerful, deep, crisp waves of bass.
Technical Data:
Rated power 200 W
Maximum power 300 W
Nominal impedance Z 4 Ohm
Frequency response 32 - 20000 Hz
Mean sound pressure level 90 dB (2,83V/1m)
Cut-off frequency 250 Hz
Principle of Housing offener Dipol / open dipole
Outer dimension height 1215 mm
Outer dimension width 538 mm
Outer dimension depth 355 mm
CONSTRUCTION
The panels are cut to size and glued together as shown in the drawing. The crossover can be attached to the rear of the baffle between the loudspeakers, for example, or on the base. The terminal connections are fitted to the vertical panel attached to the base.
Proposal 2 is more complicated. The edges are embellished with solid wood strips. In addition, a grille frame is included so that the entire front can be covered with fabric (please order separately). The frame is simply forced between the side pieces. The woofer should be recessed by 10 mm so that it does not touch the fabric.
If critical tube amplifiers are used, the impedance curve should be made more linear (see circuit diagram). The components are mounted on a separate PCB as shown in the circuit diagram and connected upstream of the input to the NoBox BB crossover.
Component parts list for 1 box
The kit includes all the components listed here but not the cabinet.
Fullrange speaker B 200 6 Ohm 1 piece
Woofer BGS 40 8 Ohm 1 piece
Terminal ST 77 1 piece
Crossover Crossover NoBox BB
Wood screws 5 x 30 mm 8 pieces
Wood screws 4 x 25 mm 6 pieces
Cable 2 x 2.5 mm2 1.5 m
Cabinet parts list for 1 box
Parts Size (mm) Quantity
Version 1:
Material: 19 mm chipboard or MDF
Front panel 1210 x 500 1
Bottom panel 325 x 500 1
Side panels 1216 x 355 2
Panel for terminal 150 x 150 1
Version 2:
Material: 19 mm chipboard or MDF
Front panel 1210 x 512 1
Bottom panel 315 x 500 1
Side panels 1186 x 295 2
Panel for terminal 150 x 150 1
Material: Wood strips
Edges 1220 x 30 x 30 4
Upper edges 143 x 30 x 30 2
Material: 10 mm MDF
Frame 1210 x 498 1
Schéma du filtre passif de l'enceinte Visaton NOBOX BB en kit :
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