User manual B&W DM 305

[. . . ] This greatly helps to break up the regular internal cabinet volume that would otherwise encourage coloration from internal standing waves. homogeneous fibre cone bass/midrange drive units are used for minimum coloration and maximum definition. The DMTM305 also features a soft dome tweeter with magnetic fluid cooling to ensure good definition to the limits of audibility and maintain dynamics to high sound levels. [. . . ] If the general level of bass is too high, try moving the speakers further away from the walls. Conversely, if you need more bass, move the speakers closer to the walls. Space behind the speakers also improves the impression of perspective on well recorded material. If the central image is poor, try moving the speakers closer together or toeing them in so they point at or just in front of the listening area (figure 5). If the sound is too harsh, increase the amount of soft furnishing in the room. Conversely reduce the amount of soft furnishing if the sound is dull and lifeless. Test for flutter echoes by clapping your hands and listening for rapid repetitions. These can smear the sound, but may be reduced by irregular shaped surfaces such as bookshelves and large pieces of furniture. Whenever possible fit the spike feet supplied after you have optimised the positioning. Initially, screw the lock nuts fully onto the spikes and screw the spikes fully into the threaded inserts in the base of the cabinet. If the cabinet rocks, unscrew the two spikes that do not touch the floor equally until the cabinet sits firmly on the floor, and lock them in place by tightening the lock nuts against the cabinet. If there is no carpet and you wish to avoid scratching the floor surface, use a protective disc between the spike and the floor. (figure 4) Some experimentation with the position of the speakers is well worthwhile to optimise the interaction between them and the listening room. However, as an initial guide: Do not fit the spike feet until you have found the best position for the speakers. place the speakers and the centre of the listening area approximately at the corners of an equilateral triangle. Having the speakers too close to walls increases the level of bass relative to the midrange and may give a boomy quality to the sound. [. . . ] Failure to observe correct polarity will result in poor sound balance and image focusing. Before fine tuning the installation, double check the polarity and security of the connections. If the level of bass is uneven with frequency, this is usually due to strong excitation of resonance modes in the room. [. . . ]