B225
USER MANUAL
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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. B225 Service Parts & Accessories................................................................... 11
13. Warranty.......................................................................................................... 11
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1. Introduction
Thank you for purchasing Tannoy B225.
The Tannoy B225 is a 15” direct radiating bass loudspeaker system. For installations
that require extended bass response from an ultra-compact cabinet, with flying and
wall-bracket mount capabilities, the B225 makes the ideal companion to Tannoys' i/T
series of sound reinforcement loudspeakers.
The B225 uses a high efficiency 15” driver, combining powerful, natural bass
performance with compact dimensions. M10 flying points located around the cabinet
mean the B225 can be quickly and easily installed using the EBS10 Eye Bolt Set.
Capable of delivering high sound pressure levels with extremely low distortion, the
B225 adds extra low frequencies with traditional Tannoy reliability.
2. Unpacking
Every Tannoy B225 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 B225 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 have adopted the following wiring standard for B225:-
SPEAKON™
CONNECTOR
Pin 1+
SIGNAL
Positive
Negative
Pin 1-
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
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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 B225 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 B225 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 B225 utilises convenient M10 flying points where the unit can be flown, by utilising
the EBS10 Eye Bolt Set 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.
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 Space
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
50Hz - 2kHz
Recommended Amplifier Power
Power Handling
400 - 800 Watt / 8W
Average(2)
400 Watt
Programme
800 Watt
Peak (10ms)
1600 Watt
Sensitivity (1)
2.83 volt @ 1m
95dB
98dB (half space)
Maximum SPL (3)
@ 1m
Average
121dB
Peak
127dB
Impedance
Nominal
Minimum
8W
7W
Distortion
0.1 Full Power
100 Hz
2nd Harmonic
1.37%
3rd Harmonic
0.57%
250 Hz
0.63%
0.451%
0.01Full Power
100 Hz
2nd Harmonic
0.42%
3rd Harmonic
0.149%
250 Hz
0.35%
0.312%
Driver Complement
Crossover Point
1 x 15” High efficiency bass unit, Type 3814
Active: Recommended points
100-300 Hz, 24dB/octave, Linkwitz – Riley
(depending on application)
Enclosure
Finish
65 litre, vented MDF
Textured black/grey paint
Black Perforated Steel
2 × Speakon™ NL4MP – in/out
8 × M10 flying inserts
Protective Grille
Connectors
Fittings
Dimensions
590mm (H) × 450mm (W) × 420mm (D)
23.2” (H) × 17.7” (W) × 16.5” (D)
Weight
24.0 kg (52.8 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. B225 Service Parts & Accessories
Part Number Description
7900 0597
7900 0601
Driver Kit Type 3814
Recone Kit Type 3814
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 B225 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 27nd March 2001
Group of Companies
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