Bowers and wilkins dm 305

But at least outwardly the system hasn't undergone any significant changes.

Rachel Cramond Thursday, October 25, They call this new form of construction the Prism system and it comprises a plastic moulded back panel having many of pyramid-shaped spikes projecting into the cabinet expressly to break up, and hence reduce the undesirable coloration from internal standing waves. However, it should still be seen as a non-luxury loudspeaker in comparison with most systems of similar dimensions. It does not simply have a strong family resemblance to the earlier model, it looks uncannily as if the designers have taken a DM and stuck it on top of a box with a moulded fascia whose angled edges carry the DM's profile down to floor level. Of course there is more to the new model than this. Although the 26mm tweeter is the same wide ranging soft-dome unit as in the DM, the woofer is entirely new.

Bowers and wilkins dm 305

The new DM is a relatively small and affordable two-way tower speaker whose performance belies its size, weight, and cost. The center of the woofer cone has a rigid conical dome, and both drivers are normally concealed by a removable plastic-framed grille. In addition to a conventional circular bass duct whose vent is on the rear of the cabinet, there is also a narrow ducted vent across the front of the cabinet below the woofer. The rear of the cabinet presents an unusual appearance. It resembles an egg-crate, with more than fifty square openings. At the center are the input connectors. The input connectors are two sets of recessed binding posts, normally paralleled by removable metal jumpers. They allow the system to be biwired or biamplified, and apparently they are designed for use only with stripped wire ends, which must be passed through holes in the posts and then screwed down; dual banana plugs cannot be used, and even single plugs are extremely awkward to install because of the limited visibility and finger access to the connections. Because the DM is a floor-standing system, it is not magnetically shielded. Our measurement of the external magnetic-field strength at 4 inches from the front panel of the speaker showed a safe flux level of less than 2 gauss, indicating that the DMs could be placed fairly close to a TV if necessary. We measured a maximum of 26 ohms at 65 Hz and a minimum of just over 4 ohms at 1. The measured sensitivity was a respectable 90 dB sound-pressure level SPL at 1 meter with a 2. Nevertheless, there appears to be considerably more to this loudspeaker than can be inferred from its plain exterior and modest price — in fact, it must be inferred, since the manual is surprisingly reticent about technical details of its design. Fortunately, the speaker speaks for itself with an eloquence rarely associated with products in its price and size range. Read all.

However, it is a middleweight performer with a limited punch. Nevertheless, there appears to be considerably more to this loudspeaker than can be inferred from its plain exterior and modest price — in fact, it must be inferred, since the bowers and wilkins dm 305 is surprisingly reticent about technical details of its design. The price is about right but its baby brother, the DM now looks like even better value for money at less than half the price.

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The new DM is a relatively small and affordable two-way tower speaker whose performance belies its size, weight, and cost. The center of the woofer cone has a rigid conical dome, and both drivers are normally concealed by a removable plastic-framed grille. In addition to a conventional circular bass duct whose vent is on the rear of the cabinet, there is also a narrow ducted vent across the front of the cabinet below the woofer. The rear of the cabinet presents an unusual appearance. It resembles an egg-crate, with more than fifty square openings. At the center are the input connectors. The input connectors are two sets of recessed binding posts, normally paralleled by removable metal jumpers. They allow the system to be biwired or biamplified, and apparently they are designed for use only with stripped wire ends, which must be passed through holes in the posts and then screwed down; dual banana plugs cannot be used, and even single plugs are extremely awkward to install because of the limited visibility and finger access to the connections. Because the DM is a floor-standing system, it is not magnetically shielded.

Bowers and wilkins dm 305

Rachel Cramond Thursday, October 25, They call this new form of construction the Prism system and it comprises a plastic moulded back panel having many of pyramid-shaped spikes projecting into the cabinet expressly to break up, and hence reduce the undesirable coloration from internal standing waves. However, it should still be seen as a non-luxury loudspeaker in comparison with most systems of similar dimensions. It does not simply have a strong family resemblance to the earlier model, it looks uncannily as if the designers have taken a DM and stuck it on top of a box with a moulded fascia whose angled edges carry the DM's profile down to floor level. Of course there is more to the new model than this. Although the 26mm tweeter is the same wide ranging soft-dome unit as in the DM, the woofer is entirely new. It is larger, at mm, and has a resin-impregnated homogeneous fibre paper coil with internal damping and a stiffened neck for improved stability. A novel feature, which enables the cone to emulate the smooth response of Kevlar cones, is a series of V-section embossed ribs described as 'wave spoilers'. These run out tangentially from the central former region almost to the cone edge and have the effect of inhibiting standing waves due to transmitted and reflected energy within the cone, including bell-mode or 'lampshade' resonance modes. The chassis is a high-rigidity casting.

Nationwide 723

Stuffing dusters into the rear vents I'll try anything in the interests of science robbed the loudspeakers of almost all of their warmth and bass extension. The nominal impedance is quoted as 8 ohms but this dips to a 4. The upper portion, which houses the drive units and the Prism back panel, with its array of inward projecting 'wedges' and six front-to-back braces, has a front facing letterbox shaped reflex port as in the DM It is larger, at mm, and has a resin-impregnated homogeneous fibre paper coil with internal damping and a stiffened neck for improved stability. The new DM is a relatively small and affordable two-way tower speaker whose performance belies its size, weight, and cost. The measured sensitivity was a respectable 90 dB sound-pressure level SPL at 1 meter with a 2. The former arrangement, which I suppose looks more disciplined, works well with over-bright loudspeakers as the listener is then marginally off-axis and extreme high frequencies are to some extent attenuated. It resembles an egg-crate, with more than fifty square openings. Rachel Cramond Thursday, October 25, As for bass, I have said that quite low-pitched sounds were clearly audible, but coverage of the lowest octaves was uneven. If you are a library, university or other organisation that would be interested in an institutional subscription to Gramophone please click here for further information. Although the 26mm tweeter is the same wide ranging soft-dome unit as in the DM, the woofer is entirely new. At the center are the input connectors. Tweeter height is about ideal and so the main detail to be determined was whether to point the loudspeakers straight ahead or at an angle towards the listening position.

But at least outwardly the system hasn't undergone any significant changes.

Of course there is more to the new model than this. As for bass, I have said that quite low-pitched sounds were clearly audible, but coverage of the lowest octaves was uneven. The area of heads' mounting is reinforced by bars. Slit-type output of the resonator on the faceplate and the classic cylindrical one on the rear panel are connected with total volume of the loudspeaker. Therefore, although the tweeter design and its mounting plate combine to give a good measure of equable dispersion over a wide frontal angle, I angled-in the loudspeakers to put myself almost exactly on-axis. At the center are the input connectors. The chassis is a high-rigidity casting. Paper cone of the woofer is also profiled in a special way. In addition to a conventional circular bass duct whose vent is on the rear of the cabinet, there is also a narrow ducted vent across the front of the cabinet below the woofer. However, the space, creating by the acoustic pair, has relatively low resolution in depth: the scene seems to be a bit flat.