Tannoy B400 User Manual Download Page 6

8. Positioning

When a bass loudspeaker is used in an environment with boundary surfaces, its placement
affects its frequency response. When such effects are properly understood, they can be used
to great effect in producing the desired sound quality without the aid of additional
amplification.

Consider fig (a) in the diagram below, here we see a loudspeaker in free field or anechoic
conditions. We measure its sound pressure level at a distance D, and refer to this as our
reference level, or 0 dB SPL.
If we now place a large reflective surface (i.e., a wall, ceiling or floor) next to the
loudspeaker, see fig (b), the sound that is radiated towards the boundary is reflected. As a
result, the sound pressure level can increase by as much as 3 dB (effectively doubling the
available amplifier power). The loudspeaker is radiating its power into half as much space,
this is known as half space loading. For each additional boundary the SPL can increase by
3dB. Corner placement or eighth space loading can increase a bass speaker’s efficiency by
up to 9dB.
This effect is not the same at all frequencies. Loudspeakers are only essentially
omnidirectional at low frequencies (where the wavelength is large in comparison to the
loudspeaker). At high frequencies sound radiates in a more directional manner. We can
position full range loudspeakers next to a boundary in order to boost the lower frequencies
while the highs remain unchanged.
Coupling, or placing bass cabinets together will also increase bass output.

Summary of Contents for B400

Page 1: ...B400 USER MANUAL...

Page 2: ...ling 4 Polarity Checking 5 Amplification Power Handling 6 Crossovers 7 Equalisation 8 Positioning 9 Dimensions 10 Rigging 11 Performance Data 12 Technical Specifications 13 Recommended Service Parts A...

Page 3: ...he air and by using 35mm tubing a tripod can be eliminated 2 Unpacking Every Tannoy product is carefully inspected before packing After unpacking your B400 please inspect for any exterior physical dam...

Page 4: ...larity Checking It is most important to check the polarity of the wiring before the speaker system is flown A simple method of doing this without a pulse based polarity checker for LF units is as foll...

Page 5: ...dB This precaution is important to the overall system balance when only a single active crossover is being used with multiple cabinets it is therefore recommended that the same amplifiers are used thr...

Page 6: ...undary is reflected As a result the sound pressure level can increase by as much as 3 dB effectively doubling the available amplifier power The loudspeaker is radiating its power into half as much spa...

Page 7: ...9 Dimensions 115 0 160 0 260 0 650 0 130 0 578 0 555 0 325 0 B400 365 0 330 0...

Page 8: ...ficer before installing any Superdual series product Alternatively check all relevant laws or bylaws The B400 utilises MAN Rigging accessories This easy to use system combines flexibility with the hig...

Page 9: ...11 Performance Data...

Page 10: ...Finish Textured black grey paint Protective Grille Perforated steel black with 50 free air flow Connectors 2 x Speakon NL4MPR IN OUT Rigging Fittings 2 x Recessed carrying handles 1 x 35mm Pole Mounti...

Page 11: ...0732 Tannoy TDX1 Digital loudspeaker management system HK 220 240V 14 Warranty No maintenance of the B400 loudspeaker is necessary All Tannoy professional loudspeaker products are covered by a 5 year...

Page 12: ...ed such that electromagnetic disturbances generated do not exceed levels allowing radio and telecommunications equipment and other apparatus to operate as intended and the apparatus has an adequate le...

Page 13: ...99 Fax 44 0 1236 428230 Internet http www tannoy com TGI Tannoy 300 Gage Avenue Kitchener Ontario CANADA N2M 2C8 Telephone 519 745 1158 Fax 519 745 2364 Tannoy Nederland BV Anthonetta Kuijlstraat 19 3...

Reviews: