TOA Electronics T12, i12 User Manual

T12 & i12

USER MANUAL

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

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 Speakon™ 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

Should you encounter any problems obtaining Speakon connectors, please contact Neutrik or its distributors directly on the following numbers:-

UK: NEUTRIK MARKETING:	0171 792 8188
USA: NEUTRIK USA INC.:	[phone]

For a world wide list of distributors, please contact Neutrik directly:-

NEUTRIK AG:

[phone]

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	C.S.A. OF EACH	CABLE	% POWER LOSS	% POWER LOSS
(m)	CONDUCTOR (mm)	RESISTANCE Ω	INTO 8Ω LOAD	INTO 4Ω LOAD
10	2.5	0.14	1.7	3.5
	4.0	0.09	1.1	2.2
	6.0	0.06	0.73	1.5
25	2.5	0.35	4.3	8.6
	4.0	0.22	2.7	5.4
	6.0	0.14	1.8	3.6
50	2.5	0.69	8.6	17.0
	4.0	0.43	5.4	11.0
	6.0	0.29	3.6	7.2
100	2.5	1.38	17.0	35.0
	4.0	0.86	11.0	22.0
	6.0	0.58	7.2	14.0

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.

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 subbass 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.

7. Dimensions

8. Performance Data

11. Technical Specifications

Frequency response (1) +/- 3dB

Recommended Amplifier Power

Power Handling

Sensitivity (1)

2.83 volt @ 1m

Maximum SPL (3)

@ 1m

Impedance

DI Averaged (PCQ)

@1kHz (ISO)

@2kHz (ISO)

@4kHz (ISO)

@8kHz (ISO)

@16kHz (ISO)

Q Averaged (PCQ)

@1kHz (ISO)

@2kHz (ISO)

@4kHz (ISO)

@8kHz (ISO)

@16kHz (ISO)

Distortion

0.1 Full Power

250 Hz

1000 Hz

10000 Hz

0.01 Full Power

250 Hz

1000 Hz

10000 Hz

Driver Complement

Crossover Point

Enclosure

Finish

Protective Grille

Connectors

Fittings

70Hz - 25kHz

45Hz - 25kHz (with Tx2 controller)

200 - 400 watt / 8 ohm
Average(2)	Programme Peak (10ms)
200 watt	400 watt	800 watt
97 dB
Average	Peak
120 dB	126 dB
Nominal		8.0 ohm
Minimum		6.1 ohm
8.3, 250 Hz - 16 kHz
7.1
9.3
10.1
12.6
14.2
9.5, 250 Hz - 16 kHz
5.1
8.5
10.2
18.2
26.3
2nd Harmonic		3rd Harmonic
0.17%		0.14%
1.00%		1.25%
1.78%		0.04%
2nd Harmonic		3rd Harmonic
0.08%		0.06%
0.32%		0.89%
0.56%		0.01%

1 x 12” (300mm) Constant Directivity Dual Concentric Type number 3142

Passive 1.5 kHz

2nd order high pass, 2nd order low pass Halogen HF protection

38.7 litre vented, 15mm birch plywood (T12), MDF (i12)

Textured black\grey paint

Perforated steel, black with 58% free air flow

2 x Speakon NL4MPR IN/OUT

T12: 1 x Recessed carrying handle T12: 1 x 35mm pole mounting socket

T12/i12: 8 x M8 flying inserts & 1x M8 pullback point

Dimensions	486mm(H) x 370mm(W) x 385mm(D)
	19.13ins(H) x 14.57ins(W) x 15.15ins(D)
Weight	20 Kg (44 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 operate a policy of continuous research and development. The introduction of new materials or manufacturing methods will always equal or excee published specifications which Tannoy reserve the right to alter without prior notice.

Please verify the latest specifications when dealing with critical applications.

12. T12 & i12 Service Parts & Accessories

Part Number	Description
7900 0433	Driver Kit - 3142
7900 0441	Recone Kit - 3142
7900 0199	HF Diaphragm Kit
7300 0158	Crossover Kit - 1206
7900 0442	Paint - Touch up Black-Grey
8000 0644	Padded Protective Transit Cover (T12)
8000 0647	Flying Kit ( 3 x M8 Eyebolts )
8000 0648	Wall Mounting Bracket
8000 0630	Tannoy TX2 Active System Controller

13. Warranty

No maintenance of the T12 and i12 loudspeakers 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.
Rosehall Industrial Estate
Coatbridge
Strathclyde
ML5 4TF
Scotland
Telephone:	01236 420199	(National)
	[phone]	(International)
Fax:	01236 428230	(National)
	[phone]	(International)
E-Mail:	[e-mail]

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.

EASE™ Data for Tannoy Professional products available on request.

14. Wall Mounting Bracket - Assembly Instructions

A dedicated wall mounting bracket (Part No. 8000 0648) is available for the T12 & i12.The design of the bracket allows the loudspeaker to mounted either in portrait or landscape orientation:-

Landscape mounting - Remove two of the original M8 countersunk screws on one side of the cabinet, place the T- Bar in position and fix in place using the two caphead bolts which are included along with the bracket hardware, remembering to use the washers and locking washers which are also provided. Assemble the bracket as shown on the diagram below. It is imperative that the bracket is fixed soundly to the wall. Be sure to use the correct fixings (e.g. Rawbolt, Rawplug) according to the wall type.

Portrait mounting - Using a hacksaw, cut along the indents on the T-bar. Carry out the above instructions, removing two of the original M8 countersunk screws on top of the cabinet.

Exploded View of Bracket

Assembled View of Bracket

Declaration of Conformity

The following apparatus is/are manufactured in the United Kingdom by Tannoy Ltd of Rosehall Industrial estate, Coatbridge, Scotland, ML5 4TF and conform(s) to the protection requirements of the European Electromagnetic Compatibility Standards and Directives relevant to Domestic Electrical Equipment. The apparatus is designed and constructed 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 level of intrinsic immunity to electromagnetic disturbance to enable operation as specified and intended.

Details of the Apparatus:	Tannoy Contractor Loudspeaker
	Model Number: T12/i12
Associated Technical File:	EMCT12/i12
Applicable Standards:	EN 50081-1 Emission
	EN 50082-1 Immunity
Signed:

Position:	Technical Manager
	Tannoy Professional
Date:	16th July 1998

For Tannoy Ltd

Tannoy Loudspeakers are manufactured in Great Britain by :

Tannoy Ltd, Rosehall Industrial Estate, Coatbridge,

Strathclyde, ML5 4TF, SCOTLAND

Telephone: [phone] Fax: [phone]

Internet: http://www.tannoy.com

Tannoy North America Inc. 335 Gage Avenue, Suite 1, Kitchener, Ontario, CANADA, N2M 5E1 Telephone: [phone] Fax: [phone]

Tannoy Nederland BV, Anthonetta Kuijlstraat 19, 3066 GS, Rotterdam THE NETHERLANDS Telephone: [phone] Fax: [phone]

Issue 3 Part No. 6481 0266

GH 14th April 1997