TOA Electronics Speaker i12 User Manual

T12 & i12  
USER MANUAL  
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CONTENTS  
1. Introduction  
2. Unpacking  
3. Connectors/Cabling  
4. Polarity Checking  
5. Amplification & Power Handling  
6. Crossovers  
7. Equalisation  
8. Dimensions  
9. Rigging  
10. Performance Data  
11. Technical Specifications  
12. T12 & i12 Recommended Service Parts & Accessories  
13. Warranty  
14. Wall Mounting Bracket - Assembly Instructions  
15. Declaration of Conformity  
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1. Introduction  
The Tannoy T12 and i12 professional loudspeakers have been designed for a wide variety of  
sound reinforcement applications requiring extended frequency response from a compact system,  
capable of delivering high sound pressure levels with extremely low distortion, resulting in  
outstanding clarity, definition and detail.  
The T12 and i12 comprises one 12 inch Dual Concentric driver in which the low frequency (LF)  
and high frequency (HF) sources are coincidentally aligned to a point source, resulting in a smooth  
uniform frequency response over a wide area of coverage either as a portable stand alone system  
or in a multi-cabinet array. The sophisticated CAD designed waveguide combines 60 degree  
conical dispersion and excellent acoustic impedance characteristics. As the system is a point  
source, clusters and arrays have minimal lobing. These features are inherent and achieved  
without the use of any electronic signal processing.  
The T12 features a recessed carrying handle, stand mount and a rugged, multiple-ply hardwood  
cabinet with structural integrity further enhanced by internal steel braces which double as the flying  
points accepting M8 eyebolts strategically placed to distribute the weight of the enclosure evenly.  
The T12 can also be used as a low profile stage monitor. Its conical coverage pattern gives the  
performer greater freedom of movement than allowed by conventional horn loaded designs.  
While delivering the same performance as the T12 and utilising the same transducer and high  
power, low-loss crossover components the i12 is designed for fixed installations. Featuring the  
same flying system as the T12 the i12 is constructed from medium density fibreboard (MDF), for a  
high level of acoustic damping.  
For applications requiring extended low frequency enhancement, a range of Tannoy sub-bass  
systems are available and can be used in conjunction with the T12 and i12.  
2. Unpacking  
Every Tannoy T12 and i12 product is carefully inspected before packing. After unpacking your  
loudspeaker, please inspect for any exterior physical damage, and save the carton and any  
relevant packaging materials in case the loud speaker again requires packing and shipping. In the  
event that damage has been sustained in transit notify your dealer immediately.  
3. Connectors/Cabling  
T12 and i12 are fitted with 4-pole SpeakonÔ connectors. Speakon has the following advantages  
over EP and XLR type connectors: All termination’s 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 15mm and a current rating of 30 Amps. The pins of the 2 Speakon  
sockets identified input/output on the rear of the input panel are paralleled within the enclosure.  
Tannoy have adopted the following wiring standard for the T12 and i12 products :-  
Pin 1+ is Positive  
Pin 1- is Negative  
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Should you encounter any problems obtaining Speakon connectors, please contact Neutrik or its  
distributors directly on the following numbers:-  
UK: NEUTRIK MARKETING:  
USA: NEUTRIK USA INC.:  
0171 792 8188  
(201) 901 9488  
For a world wide list of distributors, please contact Neutrik directly:-  
+41 7529666  
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:-  
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 before the speaker system is flown. 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.  
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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 or the loudspeaker to be realised.  
It is important when using different manufacturers amplifiers in a single installation that the 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 active crossover is being used with  
multiple cabinets, it is therefore recommended that the same amplifiers are used throughout.  
6. Crossovers  
The T12 and i12 are supplied as standard for passive operation via the internal crossover network.  
If higher peak outputs are required then both models can be used in conjunction with the Tannoy  
TX2 controller/crossover which provides high pass filtering and a degree of parametric  
equalisation (see performance data section), as well as a fixed crossover point for use with sub-  
bass loudspeakers.  
7. Equalisation  
The T12 and i12 loudspeakers are designed to need no equalisation or correction to overcome  
system limitations. As a result, they 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. T12 and i12 loudspeakers are point source, phase coherent designs and violent  
equalisation will be detrimental to the overall sound quality.  
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7. Dimensions  
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8. Performance Data  
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