Tannoy Speaker B475 User Manual

B475  
USER MANUAL  
 
CONTENTS  
1. Introduction.......................................................................................................... 5  
2. Unpacking............................................................................................................ 5  
3. Connectors/Cabling ............................................................................................. 5  
4. Polarity Checking................................................................................................. 6  
5. Amplification & Power Handling ........................................................................... 6  
6. Crossovers........................................................................................................... 7  
7. Equalisation ......................................................................................................... 7  
8. Flying ................................................................................................................... 7  
9. Positioning ........................................................................................................... 8  
10. Dimensions ........................................................................................................ 9  
11. Technical Specifications................................................................................... 10  
12. B475 Service Parts & Accessories................................................................... 11  
13. Warranty.......................................................................................................... 11  
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1. Introduction  
Thank you for purchasing Tannoy B475.  
The Tannoy B475 is an 18” direct radiating bass loudspeaker system, designed for  
high definition sound reinforcement at low and ultra-low frequencies. It will extend the  
power bandwidth of Tannoy i/T range mid/high sound reinforcement systems to below  
30Hz, making it ideal for effects in club, theatre and concert sound applications, with  
ultra-low frequency enhancement and increased system headroom.  
The B475 is intended for use on the ground and can also be close stacked, while the  
main system is flown. This powerful loudspeaker is capable of delivering high sound  
pressure levels with extremely low distortion while maintaining a uniform frequency  
response throughout its dynamic range. This makes the speakers capable of  
consistent intelligibility and tonal quality at any listening level.  
The B475 comprises 1 ´ 18” high efficiency bass units housed in a heavily braced  
optimally vented enclosure. Ruggedly constructed from multiple-ply hardwood, the  
B475 features carrying handles, along with convenient flying points and a pole mount  
socket for ground-stacked applications.  
2. Unpacking  
Every Tannoy B475 product is carefully inspected before packing. After unpacking  
your loudspeakers, please inspect for any exterior physical damage, and save the  
carton and any relevant packaging materials in case the loudspeaker again requires  
packing and shipping. In the event that damage has been sustained in transit notify  
your dealer immediately.  
3. Connectors/Cabling  
The B475 is fitted with two 4-pole Speakon™ connectors. Speakon™ has the  
following advantages over EP and XLR type connectors: All terminations are  
solderless; this makes life easier at the time of installation or when field servicing is  
required. Contacts will accept 6 sq. mm wire with an outside diameter of up to 15 mm  
and a current rating of 30 Amps.  
The pins of the two Speakon™ sockets, marked input/output on the rear of the input  
panel, are paralleled within the enclosure.  
Tannoy has adopted the following wiring standard for B475: -  
SPEAKON™  
SIGNAL  
CONNECTOR  
Pin 1+  
Pin 1-  
Positive  
Negative  
Should you encounter any problems obtaining Speakon™ connectors, please contact  
Neutrik or its distributors on the following numbers: -  
UK:  
NEUTRIK MARKETING:  
01983 811 441  
USA: NEUTRIK USA INC.:  
+1 732 901 9488  
For a worldwide list of distributors, please contact Neutrik directly on: -  
+423 237 2424  
NEUTRIK AG:  
Cable choice consists mainly of selecting the correct cross sectional area in relation to  
the cable length and the load impedance. A small cross sectional area would increase  
the cables series resistance, inducing power loss and response variations (damping  
factor).  
Connectors should be wired with a minimum of 2.5 sq. mm (12 gauge) cable. This will  
be perfectly satisfactory under normal conditions. In the case of very long cable runs  
the wire size should exceed this, refer to the following table for guidance: -  
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CABLE RUN  
(m)  
C.S.A. OF EACH  
CONDUCTOR (mm)  
CABLE  
RESISTANCE W  
% POWER LOSS  
INTO 8W LOAD  
% POWER LOSS  
INTO 4W LOAD  
10  
2.5  
4.0  
6.0  
2.5  
4.0  
6.0  
2.5  
4.0  
6.0  
2.5  
4.0  
6.0  
0.14  
0.09  
0.06  
0.35  
0.22  
0.14  
0.69  
0.43  
0.29  
1.38  
0.86  
0.58  
1.7  
1.1  
0.73  
4.3  
2.7  
1.8  
8.6  
5.4  
3.6  
17.0  
11.0  
7.2  
3.5  
2.2  
1.5  
8.6  
5.4  
3.6  
17.0  
11.0  
7.2  
35.0  
22.0  
14.0  
25  
50  
100  
4. Polarity Checking  
It is most important to check the polarity of the wiring. A simple method of doing this  
without a pulse based polarity checker for LF units is as follows: Connect two wires to  
the +ve and -ve terminals of a PP3 battery. Apply the wire which is connected to the +ve  
terminal of the battery to the speaker cable leg which you believe to be connected to  
Pin 1+ of the speaker connector and likewise the -ve leg of the battery to Pin 1-.  
If you have wired it correctly the LF drive unit will move forward, indicating the wiring is  
correct. All that remains now is to connect the +ve speaker lead to the +ve terminal on  
the amplifier and the -ve lead to the -ve terminal on the amplifier. If however the LF  
driver moves backwards, the input connections need to be inverted.  
If problems are encountered, inspect the cable wiring in the first instance. It should  
also be noted that different amplifier manufacturers utilise different pin configurations  
and polarity conventions. If you are using amplifiers from more than one  
manufacturer, check the polarity at the amplifiers as well as the loudspeakers.  
5. Amplification & Power Handling  
As with all professional loudspeaker systems, the power handling is a function of  
voice coil thermal capacity. Care should be taken to avoid running the amplifier into  
clip (clipping is the end result of overdriving any amplifier). Damage to the  
loudspeaker will be sustained if the amplifier is driven into clip for any extended period  
of time. Headroom of at least 3dB should be allowed. When evaluating an amplifier, it  
is important to take into account its behaviour under low impedance load conditions. A  
loudspeaker system is highly reactive and with transient signals it can require more  
current than the nominal impedance would indicate.  
Generally a higher power amplifier running free of distortion will do less damage to the  
loudspeaker than a lower power amplifier continually clipping. It is also worth  
remembering that a high powered amplifier running at less than 90% of output power  
generally sounds a lot better than a lower power amplifier running at 100%. An  
amplifier with insufficient drive capability will not allow the full performance of the  
loudspeaker to be realised.  
It is important when using different manufacturers amplifiers in a single installation  
that they have very closely matched gains, the variation should be less than +/- 0.5dB.  
This precaution is important to the overall system balance when only a single  
compressor/limiter or active crossover is being used with multiple cabinets; it is  
therefore recommended that the same amplifiers be used throughout.  
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6. Crossovers  
For optimal performance the B475 has been designed to operate with Tannoy Install  
or Transportable series, e.g. i12/T12, i15 and T300, where overall system control is  
achieved by utilising the TDX2 system controller. The TDX2 has been factory preset  
to provide the recommended cross-over points, delays and overall system balance.  
Please refer to the TDX2 manual for operation. Alternatively, Tannoy TX1, TX2 and  
TX3 system controllers can be used.  
If you intend using an alternative loudspeaker management system (e.g. BSS™, Klark  
Teknik™, XTA™ etc) please contact your distributor or visit our website,  
www.tannoy.com for the correct parameter settings or refer to the recommended  
crossover points in the technical specifications section of this manual.  
7. Equalisation  
The B475 loudspeaker is designed to need no equalisation or correction to overcome  
system limitations. As a result, it will only need equalisation to compensate for difficult  
acoustic environments.  
Over equalisation can reduce system headroom, and introduce phase distortion  
resulting in greater problems than cures. If equalisation is required then it should be  
applied gently and smoothly. Violent equalisation will be detrimental to the overall  
sound quality.  
8. Flying  
The B475 utilises convenient flying points as well as 2 MAN pullback points allowing  
for ease of installation and flexibility with the highest levels of safety. As with any flying  
system, safety can only be guaranteed when all precautions have been implemented  
correctly. A pole mount is also provided for flying a mid/high cabinet in the air.  
NOTE: The installation of this product must be carried out in conformity with  
local building codes and standards. If necessary, consult your local safety  
standards officer before installing any product. Alternatively, check any laws or  
bylaws. Tannoy will not be held responsible for any damage caused by the  
improper installation of any flying gear or loudspeaker.  
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9. 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 Figure 9a 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 Figure 9b, 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  
(Figure 9d) 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 omni  
directional 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.  
Figure 9a. Free-Field  
Figure 9b. Half Space  
Figure 9c. Quarter Space  
Figure 9d. Eighth Space  
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10. Dimensions  
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11. Technical Specifications  
Frequency response (1) +/- 3dB  
28Hz - 240Hz  
Recommended Amplifier Power  
Power Handling  
400 - 800 Watt / 8W  
Average (2)  
300 Watt  
Programme  
600 Watt  
Peak (10ms)  
1200 Watt  
Sensitivity (1)  
2.83 volt @ 1m  
98dB  
101dB (half space)  
Maximum SPL (3)  
@ 1m  
Average  
123dB  
Peak  
129dB  
Impedance  
Nominal  
Minimum  
8W  
7.8W  
Distortion  
0.1 Full Power  
100 Hz  
2nd Harmonic  
0.22%  
3rd Harmonic  
0.12%  
250 Hz  
0.23%  
0.08%  
0.01Full Power  
100 Hz  
2nd Harmonic  
0.17%  
3rd Harmonic  
0.23%  
250 Hz  
0.21%  
0.29%  
Driver Complement  
Crossover Point  
1 x 18” High efficiency bass unit Type 4505  
Active: Recommended points  
70-240 Hz, 24dB/octave, Linkwitz – Riley  
(dependant on application)  
Enclosure  
Finish  
168 litre, vented, 18mm multi-ply birch plywood  
Textured black/grey paint  
Protective Grille  
Connectors  
Fittings  
Black Perforated Steel, with 50% free air-flow  
2 × Speakon™ NL4MP – in/out  
8 × M10 flying inserts  
2 ´ Man pullback point  
2 × recessed carrying handles  
1 ´ pole mount socket  
Dimensions  
Weight  
577mm (H) × 556mm (W) × 650mm (D)  
22.7” (H) × 21.9” (W) × 25.6” (D)  
40.0 kg (88 lbs)  
NOTES:  
(1) Average over stated bandwidth. Measured at 1m on axis, in an anechoic chamber.  
(2) Long term power handling capacity as defined in EIA standard RS - 426A.  
(3) Unweighted pink noise input, measured at 1m  
Tannoy operates a policy of continuous research and development. The introduction of new materials or manufacturing  
methods will always equal or exceed the published specifications which Tannoy reserve the right to alter without prior notice.  
Please verify the latest specifications when dealing with critical applications  
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12. B475 Service Parts & Accessories  
Part Number Description  
7900 0599  
7900 0603  
Driver Kit Type 4505  
Recone Kit Type 4505  
8001 2190  
EBS10 Eye Bolt Set M10  
8000 0727  
8000 0728  
8000 0729  
TDX2 Digital loudspeaker management system 60-250V - UK  
TDX2 Digital loudspeaker management system 60-250V - EUR  
TDX2 Digital loudspeaker management system 60-250V - USA  
13. Warranty  
No maintenance of the B475 loudspeaker is necessary.  
All Tannoy professional loudspeaker products are covered by a 5-year warranty from  
the date of manufacture subject to the absence of misuse, overload or accidental  
damage. Claims will not be considered is the serial number has been altered or  
removed. Work under warranty should only be carried out by a Tannoy Professional  
dealer or service agent. This warranty in no way affects your statutory rights. For  
further information please contact your dealer or distributor in your country. If you  
cannot locate your distributor please contact Customer Services, Tannoy Ltd at the  
address given below.  
Customer Services  
Tannoy Ltd.  
Coatbridge  
ML5 4TF  
Scotland  
Telephone:  
01236 420199  
(National)  
+44 1236 420199  
01236 428230  
(International)  
(National)  
Fax:  
+44 1236 428230  
(International)  
E-Mail:  
Website:  
DO NOT SHIP ANY PRODUCT TO TANNOY WITHOUT PREVIOUS AUTHORISATION  
Our policy commits us to incorporating improvements to our products through  
continuous research and development. Please confirm current specifications for  
critical applications with your supplier.  
EASEÔ Data for Tannoy Professional products available on request.  
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Tannoy Limited, Professional Division, Coatbridge, Strathclyde, ML5 4TF, Scotland.  
Tel: +44 (0) 1236 420199 Fax +44 (0) 1236 428230  
Tannoy / TGI North America Inc., 335 Gage Avenue, Suite 1, Kitchener, Ontario, Canada N2M 5E1.  
Tel: (519) 745-1158 Fax: (519) 745-2364  
Tannoy Nederland b.v., Anthonetta Kuijlstraat 19, 3066 GS Rotterdam.  
Tel: (010) 286 0554 Fax: (010) 286 0431  
Tannoy is a member of the  
ML 27th March 2001  
Group of Companies  
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