Tannoy B225 Manuel utilisateur

B225

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. B225 Service Parts & Accessories...................................................................11

13. Warranty..........................................................................................................11

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 SIGNAL

Pin 1+ Positive

Pin 1-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:-

NEUTRIK AG: +423 237 2424

or visit their website at: http://www.neutrik.com/

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:-

CABLE RUN

(m) C.S.A. OF EACH

CONDUCTOR (mm) CABLE

RESISTANCE ΩΩ % POWER LOSS

INTO 8ΩΩ LOAD % POWER LOSS

INTO 4ΩΩ LOAD

10 2.5

4.0

6.0

0.14

0.09

0.06

1.7

1.1

0.73

3.5

2.2

1.5

25 2.5

4.0

6.0

0.35

0.22

0.14

4.3

2.7

1.8

8.6

5.4

3.6

50 2.5

4.0

6.0

0.69

0.43

0.29

8.6

5.4

3.6

17.0

11.0

7.2

100 2.5

4.0

6.0

1.38

0.86

0.58

17.0

11.0

7.2

35.0

22.0

14.0

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.

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.

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

10. Dimensions

11. Technical Specifications

Frequency response (1) +/-3dB 50Hz -2kHz

Recommended Amplifier Power 400 -800 Watt / 8Ω

Power Handling Average(2) Programme Peak (10ms)

400 Watt 800 Watt 1600 Watt

Sensitivity (1)

2.83 volt @ 1m 95dB 98dB (half space)

Maximum SPL (3) Average Peak

@ 1m 121dB 127dB

Impedance Nominal 8Ω

Minimum 7Ω

Distortion

0.1 Full Power 2nd Harmonic 3rd Harmonic

100 Hz 1.37% 0.57%

250 Hz 0.63% 0.451%

0.01Full Power 2nd Harmonic 3rd Harmonic

100 Hz 0.42% 0.149%

250 Hz 0.35% 0.312%

Driver Complement 1 x 15” High efficiency bass unit, Type 3814

Crossover Point Active: Recommended points

100-300 Hz, 24dB/octave, Linkwitz –Riley

(depending on application)

Enclosure 65 litre, vented MDF

Finish Textured black/grey paint

Protective Grille Black Perforated Steel

Connectors 2×Speakon™ NL4MP –in/out

Fittings 8 × M10 flying inserts

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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