TOA Electronics Home Theater System TX2 User Manual

ELECTRONIC LOUDSPEAKER SYSTEM CONTROLLER  
TX2  
USER MANUAL  
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INTRODUCTION  
Thank you for purchasing the Tannoy TX2 loudspeaker system controller.  
The TX2 is an advanced electronic controller intended to optimise the performance  
of Tannoy loudspeaker systems. It can be used in full range mode where it performs  
equalisation functions, extending the low frequency response of the system  
significantly. Also, it can be switched to 2-way active mode for applications requiring  
greater capability at very low frequencies, where it provides a mono sub channel  
output with optimised high and low pass internal crossovers.  
The TX2 also features :  
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stereo operation.  
balanced inputs and outputs.  
individual sub level control.  
high pass filters to protect against hazardous ultra low frequencies.  
industry standard 19’’ rack-mounting  
As well as technical specifications, this manual contains some helpful advice on how  
to use the controller. Thank you for taking a few minutes to read it prior to  
installation.  
OPERATING INSTRUCTIONS  
Preliminary advice and information.  
The information contained in this manual is relevant for all TX2 controllers although  
versions will vary with different internal adjustments for equalisation or cross-over  
sections. Each version is dedicated for use with a specific Tannoy loudspeaker  
system. Make sure that the controller you are planning to use is suitable for your  
loudspeakers, as degradation of the sound quality and unreliable operation could  
result from an improper combination.  
Please inspect the unit immediately after unpacking for signs of transit damage. In  
the unlikely event that this has occurred please inform the carrier and the supplier. It  
is always a good idea to keep the carton for possible future transportation.  
Before the TX2 is connected to the mains supply, make sure that the unit is  
selected for operation with the correct mains voltage. This can easily be checked  
by looking at the rear panel, where the selected input voltage appears on the voltage  
selector itself, located near the mains socket. Where necessary, change the selection  
by sliding the switch to the correct position. The position marked 115V is suitable for  
any mains voltage from 100V to 120V, whereas the position marked 230V will suit  
any voltage between 220V and 240V.  
Figure 1. TX2 back panel  
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Input connections.  
As with other devices of its type, the TX2 controller is inserted in the audio chain  
between the last link of audio source (mixing console, preamp, CD player, etc.) and  
the power amplifiers.  
The two audio inputs are the 3 pin female XLR connectors on the rear panel, marked  
L for left and R for right. On each connector the signal is received between pins 2  
and 3 and pin 1 is grounded.  
When the device connected at the input (e.g. console) and at the output (i.e.  
amplifier) are both balanced, there is no hot and cold pin to worry about : the TX2 is  
neutral polarity with pin to pin connections (pin 1 to pin 1, pin 2 to pin 2, pin 3 to pin  
3). Note that pin 1 connection should be made using the cable shield.  
Where a device with an unbalanced output (e.g. hi-fi CD player or preamplifier) is  
connected to the input of the TX2, the signal should be applied to either pin 2 or pin  
3 of the input XLR, according to which pin is ‘hot’ on the amplifier connected at the  
output. The unused signal pin (3 or 2 respectively) should then be linked to pin 1 for  
grounding (see Fig. 2).  
Figure 2. Input connections from an unbalanced source  
Output connections.  
The audio outputs are the three 3 pin male XLR connectors on the rear panel. Two of  
them (marked L for left and R for right) are the output channels for the main system,  
while the third one (marked MONO SUB OUT) is for the optional sub-bass system.  
On each of these connectors the signal is applied between pins 2 and 3 and pin 1 is  
grounded.  
When devices connected at the input (e.g. console) and at the output (i.e. amplifier)  
are both balanced, as said previously, the controller is neutral polarity with pin to pin  
connections (pin 1 to pin 1, pin 2 to pin 2, pin 3 to pin 3).  
Where amplifiers with unbalanced inputs are used, the hot pin of the amplifier input  
should be connected to either pin 2 or pin 3 of the TX2 output XLR, according to  
which pin is ‘hot pin’ on the device connected at the input. The unused signal pin (3  
or 2 respectively) should then be linked to pin 1 for grounding.  
Note however that the use of amplifiers with unbalanced inputs - rather unusual for  
professional products - is not recommended, among other drawbacks it will cause the  
level to drop by 6dB on the outputs of the controller.  
Operation with and without a sub-bass system.  
The unit should be powered (green LED showing on the front panel) before being  
connected , or the amplifiers should be turned off, to avoid any switch noise or power  
surge that could damage the loudspeakers. Similar precautions should be taken  
when power is switched off.  
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Figure 3. TX2 front panel  
The way the TX2 operates with and without the sub-bass system can be seen on the  
simplified block diagram of Fig. 4.  
When the front panel push-button (left side of the SUB-BASS window) is depressed,  
the main - left and right - channels operate full range with the signal passing through  
the LF EQ section, resulting in an extension of the bottom end response of the  
system. This section consists of a ‘High Q’ 2nd order high pass filter which provides  
electronic boost where required and also cuts very low frequencies.  
When the switch is pushed in, with the adjacent red LED coming on, the LF EQ  
section is bypassed and the signal on each main channel is re-routed via a high-pass  
filter at 100Hz designed to provide an optimised acoustic summation for the sub-  
bass system.  
On the sub-bass channel, signals from both left and right inputs are summed  
together, and the resulting mono signal is low-pass filtered before being sent through  
the level control section.  
To sum up: the push-button should be ‘in’ when a sub-bass system is used, ‘out’  
when not.  
However it should be noted that the sub-bass channel itself is not affected by the  
position of the switch, which means that it is possible to have the main system  
operating full range while the sub-bass is also in operation. In that configuration both  
systems would overlap over a wide bandwidth, with a large phase cancellation.  
Reversing the polarity on the sub overlapping the main system would on the other  
hand give an excess of energy in the 60-100 Hz range, but to the detriment of sound  
accuracy, headroom and sensitivity to spatial alignment of the loudspeakers.  
Figure 4. TX2 simplified block diagram.  
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SERVICING  
If servicing is required, it must only be carried out by qualified personnel. Do not  
remove the top cover as there may be a risk of electric shock.  
Fuse replacement.  
Disconnect the TX2 from the mains power supply, and pull back the fuse drawer  
located at the bottom of the mains input. (A small screwdriver might be helpful.) The  
fuse drawer has two compartments, one containing the fuse under operation and the  
other a spare. Replacement fuses must be of the 5 x 20 mm type, and of the correct  
rating as indicated on the back of the unit.  
Having replaced the fuse push the drawer in fully, until it is secured in its original  
position.  
List of spare parts.  
This list does not include any individual electronic parts contained in the unit. For  
more detailed information please refer to the Service Manual or consult your local  
dealer or distributor.  
PART NUMBER  
DESCRIPTION  
6481 0273  
6883 0096  
6883 0093  
6883 0095  
TX2 User Manual  
TX2 Front Panel  
TX2 case. Chassis  
TX2 case. Top cover  
Warranty  
No maintenance of the controller is necessary.  
All Tannoy electronic components are guaranteed for a period of one year from the  
date of manufacture, subject to the absence of, or evidence of, misuse, overload or  
accidental damage.  
For further information please contact your dealer or the distributor in your country.  
If you cannot locate your distributor please contact :  
Customer Services  
Tannoy Limited  
Professional Division  
Rosehall Industrial Estate  
Coatbridge  
Strathclyde ML5 4TF  
Scotland  
Telephone  
Fax  
e-mail  
01236 420199 (UK)  
01236 428230 (UK)  
+44 1236 420199 (International)  
+44 1236 428230 (International)  
DO NOT SHIP ANY PRODUCT TO TANNOY WITHOUT PREVIOUS  
AUTHORISATION.  
This warranty in no way affects your statutory rights.  
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TECHNICAL SPECIFICATIONS  
Inputs  
Two electronically balanced inputs on 3 pin XLR connectors.  
Input impedance 10 kW.  
Outputs  
Three electronically balanced outputs on 3 pin XLR  
connectors. (Left, Right and Mono Sub)  
Output impedance 50 W.  
Max. level +20 dBV.  
Hum and Noise  
-90 dBV, 20 Hz - 20 kHz unweighted  
Controls and Indicators  
Power on LED.  
Sub channel operation switch and LED.  
Sub level control potentiometer, -6dB to +6dB.  
Mains supply  
IEC mains connector with integral fuse holder.  
Voltage selector for 115V or 230V operation (50/60Hz).  
Fuse type 5 x 20mm, rating T32mA - 250V for 230V  
operation, T63mA - 250V for 115V operation.  
Dimensions  
Weight  
1U high, 19” rack mount width  
44.5 mm H x 482 mm W x 150 mm D  
1.7 kg  
Tannoy operate 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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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.  
The apparatus complies with the Principal Elements of the Safety Objectives of the Low  
Voltage Directive 73/23/EEC.  
Details of the Apparatus:  
Tannoy Active Crossover/Equaliser  
Model Number: TX2  
Associated Technical File:  
Applicable Standards:  
EMCTX2  
EN 50081-1 Emission  
EN 50082-1 Immunity  
EN 60065:1994  
Signed:  
Position:  
Date:  
Technical Manager  
Tannoy Professional  
16th July 1998  
For Tannoy Ltd  
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Tannoy Loudspeakers are manufactured  
in Great Britain by :  
Tannoy Limited, Coatbridge, ML5 4TF. SCOTLAND  
Telephone: +44 (0)1236 420199 Fax: +44 (0)1236 428230  
TGI/Tannoy, 300 Gage Avenue, Kitchener, Ontario, CANADA, N2M 2C8  
Telephone: (519) 745 1158 Fax: (519) 745 2364  
Tannoy Nederland BV, Anthonetta Kuijlstraat 19, 3066 GS, Rotterdam THE NETHERLANDS  
Telephone: (010) 2860554 Fax: (010) 2860431  
Tannoy is a member of the  
Group of Companies  
Issue 2 Part No. 6481 0273  
GH 30th March. 1998  
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