BSS Audio
V 4.0
TCS-80X User Manual version v4.0
3rd December 1997
User Manual
This equipment has been tested and found to comply with the following European
and international Standards for Electromagnetic Compatibility and Electrical Safety:
Radiated Emissions (EU):
RF Immunity (EU):
Mains Disturbance (EU):
Electrical Safety (EU):
(1990) Associated Equipment
(1992) RF Immunity, Fast
Transients ESD
We have written this manual with the aim of helping installers, sound engineers
and consultants alike get to grips with the TCS-80X series and obtain its maximum
If you are new to BSS equipment, we recommend that you begin at the start of the
manual. If, however, you are already familiar with the intended application, and
just want to get the unit installed without delay, then follow the highlighted
sections. Since this manual is dual purpose in covering both the TCS-803 and the
TCS-804 units, information that applies to only one of the units will be clearly
noted for you. Where a particular function applies to both units, the method of
access and operation is identical for both units and the manual will show pictures
of the TCS-804 as an example.
Should you have any comments or questions about applying the TCS-80X series
within your application, please write to us, or e-mail us, at the addresses in the
warranty section. We welcome any comments or questions regarding the TCS-80X
series or other BSS products, and you may contact us at the address or World Wide
Web site given in the warranty section.
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TCS-80X User Manual version v4.0
1 The TCS-80X Series.
2 What is special about BSS Delays?
3 Earthing Requirements
4 Unpacking
5 Mechanical Installation
6 Mains Power Connection
7 Input Connections
7.1 XLR Plugs
8 Output Connections
8.1 XLR Plugs
9 Control Connections
9.1 Remote Program Selection
10 Powering Up
10.1 Default Settings and Display
10.2 Error message display
10.3 Mode setting (TCS-804 only)
11 Parameter Selection
11.1 Bypass
11.2 Adjust time delay or distance
11.3 Adjust Input and Output Level (TCS-803)
11.4 Adjust Input and Output level (TCS-804)
11.5 Output mutes
11.6 Program store and recall
11.7 Control lockout
11.8 Utility
12 Master/Slave Operation
12.1 Transmit mode ‘tr t°’. Temperature Linking
12.2 Transmit mode ‘tr.Pr’. Transmit Program
12.3 Transmit mode ‘tr.SL’. Transmit Slave
12.4 Transmit mode ‘tr. -’. Transmit Off
13 Linking (TCS-804 Only)
13.1 Stereo pairs
13.2 Relative Delay, Mono mode
13.3 Relative Delay, Dual Channel Mode
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14 Applications
14.1 Time correction for audience distances
14.2 Time correction for speaker driver placement
15 Midi Implementation
16 BSS Temperature probe
17 Service section
17.1 Chassis/0V Link removal
17.2 Transient suppressor replacement
17.3 Extended memory
17.4 Option transformers
18 Warranty Information
19 Specifications
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1 The TCS-80X Series.
The TCS-803 and TCS-804 form a series of multitap time correction units that offer
you the very best from todays' affordable digital technology. Utilising advanced
BSS proprietary conversion techniques they have exceptional headroom, phase
linearity and low level resolution that will not weaken a conventional high quality
analogue signal processing chain. Whether your application is professional live
sound, theatre sound, broadcast or disc mastering the TCS-80X series will offer the
most cost effective and intelligent high specification multitap time delay that is
2 What is special about BSS Delays?
Some of the features available within the series are:
• Stereo operation with two outputs per channel accurately linked, or dual mono
• Mono one-in/four-out on the TCS-804. Mono one-in/three-out on the TCS-803.
• Friendly rotary control knob for all parameter adjustments.
• Time or distance entry and display in milliseconds, feet, inches or metres.
• 10uS minimum delay steps.
• 105dB usable dynamic range includes full +20dBu headroom with fine
resolution at low signal levels. No companding or pre-emphasis means superior
high frequency performance.
• Exceptional phase linearity and HF accuracy from high sample rate and gentle
• 12 non-volatile user programmable memories with remote recall via contact
closure or Midi.
• Maximum delay up to 2.6 seconds on TCS-804 in mono mode up to 1.3
seconds on TCS-803.
• Master/slave linking of multiple units by Midi.
• Delay time compensation for auditorium ambient temperature change. Fully
automatic on the TCS-804 with optional probe fitted.
• Electronic security lockout with optional mechanical security cover.
• Relay controlled signal bypass optionally available which is also linked into failsafe processor and power supply watchdog.
• Digital level control for both input headroom and output gain on the TCS-804,
gives automatic headroom compensation and allows remote control of output
levels and program storage.
Every TCS-80X is manufactured to the highest professional standards with a robust
steel case, high quality circuit boards and ICs, and high quality components to
provide reliable performance under the most demanding conditions of the global
sound-reinforcement environment. In common with all other BSS equipment, the
TCS-80X is subject to stringent quality control procedures throughout the
manufacturing process. Components are tested against demanding acceptance
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criteria. Every completed unit is tested both by measurement and in a listening test
carried out by trained audio professionals. To positively ensure reliability, all units
are burnt-in for fifty hours, before being tested.
3 Earthing Requirements
IMPORTANT: The wires in the mains lead are colour coded in accordance with
the following code.
Green and Yellow......Earth
As the colours of the wires in the mains lead may not correspond with the
markings identifying the terminals in your plug, proceed as follows.
• The wire which is coloured Green and Yellow or Green must be connected to
the terminal which is marked with the letter ‘E’ or by the Earth signal or which is
coloured Green and Yellow or Green.
• The wire which is coloured Blue must be connected to the terminal labelled ‘N’
or coloured Black or Blue.
• The wire which is coloured Brown must be connected to the terminal labelled
‘L’ or coloured Red or Brown.
Those units supplied to the North American market will have an integral moulded
3 pin connector which is provided to satisfy required local standards.
The mains voltage selector switch provides a simple external adjustment to allow
operation on all international AC power standards. The allowable ranges for the
supply voltage are:
90VAC up to 132VAC on the 120V position
180VAC up to 264VAC on the 240V position.
Outside of these ranges the unit will not work satisfactorily, if at all. Voltages in
excess of the maximum will probably cause damage. Voltages below the minimum
will cause the power supplies to drop out of regulation, degrading the performance
of the system.
4 Unpacking
As part of BSS' system of quality control, this product is carefully inspected before
packing to ensure flawless appearance.
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After unpacking the unit, please inspect for any physical damage and retain the
shipping carton and ALL relevant packing materials for use should the unit need
In the event that damage has occurred, please notify your dealer immediately, so
that a written claim to cover the damages can be initiated. See section 18;
Warranty Information.
5 Mechanical Installation
A vertical rack space of 1U (1¾" / 10½mm) deep is required. Adequate ventilation
must be provided for by allowing sufficient room around the sides and rear of the
unit for the circulation of air.
If the TCS-80X are likely to undergo extreme vibration through extensive road
trucking and touring, it is advisable to support the unit(s) at the rear and/or sides to
lessen the stress on the front mounting flange. Failure to do so may impair
reliability and will invalidate the warranty. The necessary support can generally be
bought ready-built, as a rack tray. As with any low-level signal processing
electronics, it is best to avoid mounting the unit(s) next to a strong source of
magnetic radiation, (for example, a high power amplifier), to help keep residual
noise levels in the system to a minimum. The front of the unit should not be
exposed to long term sunlight, as this can have a detrimental effect on the display
The internal power supply regulators are mounted on the case sides and use this as
their heatsink. After a period of time in an enclosure, the metal case will feel hot to
the touch, but this is quite normal and should not be a cause for alarm.
6 Mains Power Connection
Voltage: The TCS-80X operate on voltages specifies in the earthing requirements
section (Refer to section 3; Earthing Requirements). If the unit(s) are accidentally
connected to an AC supply giving in excess of 132V AC, refer to section 17.2;
Transient suppressor replacement.
Frequency: Both 60Hz and 50Hz are acceptable.
Grounding: The TCS-80X must always be connected to a 3-wire grounded
('earthed') AC outlet. The rack framework is assumed to be connected to the same
grounding circuit. The unit(s) must NOT be operated unless the power cables'
ground ('earth') wire is properly terminated - it is important for personal safety, as
well as for proper control over the system grounding.
Connections: The AC power cable has a moulded 3-pin utility plug attached to the
free end to facilitate the correct and proper connections.
AC Power Fusing: The incoming line power passes through a 150mA (for 240V
only) anti-surge ('T') fuse, accessible from the rear panel (The fuse is rated at
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250mA for 120V and 150mA for 240V). If the fuse blows without good reason,
refer to section 17.1;. Always replace with an identical 20mm x 5mm T rated fuse
for continued protection from equipment damage and fire.
It is unlikely that a fuse will fail during normal use, and must be treated with some
caution to the cause, if it should do so. One of the most likely reasons for failure is
the incorrect setting of the voltage switch on the rear of the unit. Another reason
could be the inadvertent connection of line to line rather than line to neutral phase
voltages when using three phase power supplies. In either case, internal transient
suppressor can be damaged, and consequently replacement fuses will continue to
blow, providing protection for your unit. The damaged suppressors must be
removed from the unit to allow further use, and should be replaced as quickly as
possible to provide continued protection. Refer to section 17.2; Transient
suppressor replacement for information on replacing these suppressors.
7 Input Connections
7.1 XLR Plugs
The input signals are 10k ohm active balanced on a standard 3 pin 'female' XLR
which will accept levels up to +20dBv, and can drive into loads of 600ohms or
greater. The wiring convention is as follows:
Pin 1: No connection (the shield of the drain wire can be terminated
here if desired).
Pin 2: Signal '+', in phase or 'HOT'.
Pin 3: Signal '-', out of phase or 'COLD'.
For unbalanced sources:
Pin 1: Leave open, or link to pin 2.
Pin 2: Shield, braid, or screen wire.
Pin 3: Signal '+' or 'HOT' (inner core).
There is no internal ground connection to Pin 1 of the female XLR to avoid
possible interconnection earth loops. The input signal cable shield must therefore
be tied to ground, or signal 0V, at the source end.
If the equipment driving the TCS-80X has only unbalanced outputs then you will
need to add a wire jumper such that the screen connection on Pin 1 of the XLR is
shorted to either Pin 2 or Pin 3, depending on system convention.
If the equipment being connected to the TCS-80X outputs have only unbalanced
inputs, then we recommend that you still use a balanced (i.e. 2 core shielded)
cable. You should ground the shield from the pin 1 connection, whilst the cold
connection should be used as the 0v ground and the hot connection for the live,
on the unbalanced input. The cable screen should not be connected through to the
chassis/0V. Strict adherence to this will help to eliminate potential ground loop
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Strict adherence to the wiring conventions noted above within a fully balanced
signal system will yield the best possible results with none of the problems
normally associated with interconnected audio equipment. Wherever possible,
cable screens should not be connected to any signal pin, but rather left to perform
a cable shielding function only. Please refer to section 17.1; Chassis/0V Link
removal for information on this procedure.
Under no circumstances should the safety ground wire be removed from the
mains AC power connector as an interim measure to achieve similar results.
8 Output Connections
8.1 XLR Plugs
The four signal outputs are DC blocked low impedance unbalanced from a
standard 3 pin male XLR and are designed to drive up to +20dBv into 600 ohms or
greater. The wiring convention is as follows:
Pin 1: Connects to shield, screen or drain wire.
Pin 2: '+', hot or 'in phase' output.
Pin 3: '-', cold or 'out of phase' output.
If the amplifiers you are feeding have unbalanced (single ended) inputs, but are fed
from standard pin to pin XLR cables (See above), simply link the cable at the
crossover end as follows:
Pin 1: Connects to shield or screen wire.
Pin 2: Link to Pin 1.
Pin 3: Connects to the inner 'hot' or live core.
Unbalanced transmission is not recommended for connections to distant
equipment, but is generally acceptable for local connections within the rack, or to
an adjacent rack.
Technicians note: As with a traditional transformer balanced output, either output
phase (+ or -, hot or cold) can be linked to ground to 'unbalance the line' without
upsetting the operation of the unit. BSS follows the convention of 'screen goes
forward with the signal'. As with a transformer, output level remains the same in
the unbalanced mode.
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9 Control Connections
Both the TCS-803 and TCS-804 have two external control ports, one being the
Remote Program Selection, the other a standard MIDI control interface having both
IN, THRU and OUT connectors. More about the MIDI option and its control codes
are detailed in section 15; Midi Implementation. The 9 pin Remote Program
Selection 'D' type connector is wired as a 4 by 3 matrix which allows by simple
switch closure, the selection of 12 user programmable memories. The figure below
gives the matrix pinning for each program number.
9.1 Remote Program Selection
The voltage available at these pins is less than 5V and current limited, so that no
particular attention needs to be paid to safety and either momentary or latching
switch closure is all that is required to recall a memory number. Individual
screened cable is not required to connect your remote switching box to the TCS80X, however it is recommended that you use a cable that has an overall screen,
which should be connected to your control box at one end and the designated pin
on the D-Connector at the other end.
PX is the program number which is recalled by connecting together the two
designated pin numbers. Pins 5 and 9 are connected to ground.
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10 Powering Up
When the TCS-80X is switched on, by operating the power on-off switch located
on the rear panel, the internal circuitry carries out a series of routine diagnostic
tests. The display will show a series of numbers which will advise:
• The TCS model number, plus a suffix ‘E’ if the internal memory has been
• The software version number currently fitted.
• Which interface option is fitted (TCS-804 only).
• If the BSS temperature probe is fitted (TCS-804 only)
10.1 Default Settings and Display
Following the startup routine and screen display, the TCS-80X will automatically
resume the settings that were last selected, and show the last selected delay before
the previous switch-off. When first powered up, the factory set defaults will be as
shown below.
The internal memory automatically remembers all switch functions and display
readings when the unit is switched off, so it is not necessary to reload level and
delay information every time the unit is activated. The same applies for the user
programs, whose memory retains their contents indefinitely when mains power is
Factory Default Settings
Tr. Pr
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10.2 Error message display
Should the unit detect bad data internally, on a control interface, or an
incompatible mode setting, an error message number will be displayed to show
there is a problem. Any other indicated errors will require the unit to be referred to
an authorised service centre for repair.
Err.3 Midi timing error
Err.4 Option interface timing error
Err.5 Incorrect mode selected for master-slave linking or program recall
Err.6 Program Store Error
10.3 Mode setting (TCS-804 only)
The two modes of operation of the unit are selected by the push switch located on
the rear panel and labelled ‘mode select’.
Confirmation of the selected mode will be seen from the front panel display. For
MONO mode the top headroom meter display will be active, as will the legend
MONO. In DUAL CHANNEL mode the MONO legend will be extinguished and
replaced by the letters L and R adjacent to each headroom display meter.
The MONO operation mode is where all four delay outputs are part of the one
channel, this being the ‘left’ channel. Four independent delay taps from the one
unit give extra flexibility in system design. Please use the legend printed above the
delay selection switches.
In DUAL CHANNEL mode, the TCS-804 is partitioned, to give two identical
channels, each one having two delay outputs. Each channel can be operated
separately, or with the output pairs linked as is necessary for true stereo operation.
Linking is explained fully later on in this manual.
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11 Parameter Selection
This section deals with selection of the various modes of operation as well as the
adjustment of delay times and signal path gain structure.
Where a feature is common to both the TCS-803 and TCS-804, the selection and
adjustment is identical. Where there is a difference, it will be described separately.
We hope you will find it quite intuitive to operate and suggest that you have your
unit with you to operate the switches as you read through this section.
11.1 Bypass
The bypass function or IN/OUT provides a switch toggle for cancellation of all
delay times. For complete cancellation of all electronic stages and level settings,
the output relay option needs to be specified. The bypass is then a complete
input/output wired link.
Normal operation.
Total bypass input to output.
11.2 Adjust time delay or distance
The TCS-80X will allow the required delay to be set in ‘time’ or in ‘distance’ units.
This is selected by operating the units switch. If more delay time is required, an
extended memory option is available which is easily installed. To set the delay:
Select a delay to read or adjust it’s value.
If required, select to alter display units. Readings in excess of '9999' will show
‘FEET’ and then automatically change to read feet.
Turn knob for fine adjustment or push and turn for coarse adjustment.
11.3 Adjust Input and Output Level (TCS-803)
Separate input headroom and output level controls are provided on the front panel
to enable optimum operating headroom setting, and individual output level trim.
The input control range allows for a maximum operating level between 0dBu and
+20dBu. The output level control allows for individual gain adjustment of the three
outputs by plus or minus 10dB. There will be unity gain through the unit when
both input and output level controls are in their central position.
It is most important for correct operation of the unit that you set the input level
control correctly. As is common for all electronic equipment, care must be taken to
ensure that the input signal does not exceed the maximum internal clipping level
and the input headroom meter is therefore an important display. When setting up,
ensure that on one hand your maximum signal peak does not exceed the 0dB scale
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point, and on the other that it is not wasteful of dynamic range. It is always
adjusted first on initial setting up.
The output level trims will be useful for providing some degree of individual
adjustment for each of the three outputs. They can be adjusted following the
correct setting of input headroom. Remember that if the input control needs to be
turned back, the output control will need to be turned up to restore the through
gain as these two controls work together. The input control works to maximise
operating dynamic range whilst the output control works to trim the required
through gain.
11.4 Adjust Input and Output level (TCS-804)
Input headroom and output level adjustment is essential for the correct operation
of the unit to maximise dynamic range and trim individual output gains. The
section for TCS-803 should be read if more detail is required, but remember that
for the TCS-804 all adjustment is performed digitally, rather than with analogue
control knobs. To enter the level adjustment mode:
The '|-' symbol in the display denotes tandem adjustment
L denotes left channel adjustment
r denotes right channel adjustment
The display is showing the level in dBu for input clip (0dB on the headroom
meter). The symbol to the left is indicating which of the two input channels is
selected for adjustment. The ‘|-’ symbol is showing that both channels are being
adjusted together.
To adjust input levels
Turn knob to set headroom value in dBu.
Press again to select next channel or step through to exit.
For speed and convenience of use, the sequence that is used to cycle through is
different depending on whether MONO, DUAL or STEREO mode has been
To adjust output levels
At any time when in the LEVEL mode, a delay button can be selected to allow
trimming of output gain. The adjacent LED will stop flashing and remain on, to
indicate selection. The display will change to show the input to output through
gain, in dB, for the output selected.
Turn the knob to set the gain required in dB
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One of the many advantages of this digital level control is seen when adjusting
input headroom. The input to output through gain will always be held constant at
the dB value previously set because internal circuitry automatically provides the
necessary correction to output level. This will be limited to a range such that the
sum of input headroom in dB plus the through gain in dB is within a range greater
than -10dB and less than +20dB and ensures that the output circuitry can not be
set to clip the signal.
11.5 Output mutes
The TCS-804 will also allow independent muting each of the four delay outputs.
Enter the ‘LEVEL’ mode, and select the delay output to mute.
Press in control knob.
Press and turn.
The output selected will now be muted. On releasing the control knob and
returning to level display, the mute mode will be indicated by “pause” lines to the
left hand side of the display.
Press and turn.
11.6 Program store and recall
There are 12 program memories available for storing different front panel settings.
These programs are accessible either from the front panel or via either of the rear
panel control interfaces.
For the TCS-803 each program can store the individual delay times or distance that
has been set for the three outputs. Level information is not stored as it is adjusted
by the front panel analogue controls.
For the TCS-804, both delay time and output gain information are stored, together
with information on mode select, stereo linking and relative delay. Input headroom
is not stored, as this would be dangerous when recalling programs with widely
different settings.
The Program, Store and Recall operations are similar for both units, and to enter
the program mode:
The display shows the current program number.
Turn knob to select program number.
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Sets parameters to those of displayed program number.
Stores current parameters into displayed program number and will overwrite any
previous settings.
Once either Recall or Store has been pressed, the display returns to the delay
display that was shown before the Program mode was selected. Press at any time to
exit Program mode.
Press at any time to exit Program mode.
For speed and convenience, the PROGRAM mode can be accessed at any time by
pressing either the ‘store’ or ‘recall’ buttons. The display will change to show a
flashing current program number, but the store or recall function will not be
activated unless the switch is pressed a second time. Once the button is pressed
twice, the current settings are stored or the program is recalled, and the display will
return to normal.
When any storable parameter is altered, a ‘.’ appears after the program number to
show that the program has been edited and not subsequently stored. It will remain
blinking for other display modes as an operator warning. Pressing program STORE
will cancel it.
An error message appearing temporarily on the display following a program recall
is advising that the program was initially stored in the opposite MONO/DUAL
CHN mode than the unit is currently switched to. The program will be recalled,
but the error message warns that it may be inappropriate:
11.7 Control lockout
An ‘electronic security cover’ is available to stop unauthorised persons from
tampering with parameter settings that have previously been entered. The switch to
activate this is located behind the front panel and is operated by inserting a small
blunt instrument through the round hole adjacent to the IN/OUT switch. The
corresponding legend will appear.
'Safe On' allows all parameters to be viewed as normal, but none can be altered.
Press again to return to normal unprotected operation.
The control lockout will not disable any of the rear panel control interfaces.
External program selection remains active.
11.8 Utility
The utility menu is selected by pressing the UNITS button and holding for
approximately 2 seconds. Access will then be given to MIDI channel number
selection, ambient temperature setting and master/slave transmit mode.
The display changes to show the current MIDI channel number.
Turn the knob to select channel or address number;
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Press again to display temperature and again to display master/slave transmit mode.
Press and hold to exit UTILITY.
Both the TCS-803 and TCS-804 allow compensation for the change in delay times
needed to maintain a fixed distance as the ambient temperature varies. In addition,
the TCS-804 has as an optional external temperature probe which then makes this
correction automatic.
When the probe is not used, the current temperature can be manually entered. If
this then changes substantially, a new value entered will cause the delay times to
be slowly adjusted to maintain the correct distance.
When using program recall, the delay times which are stored as distance
information, will also be correctly adjusted for the current temperature, when
Turn the knob to set current temperature. If the BSS probe is fitted, it will override
the manual setting.
Press and hold to exit to normal display.
The control knob increments in one degree steps and the range of temperature
adjustment available extends from -19°C to +44°C. If there are a number of TCS80X units within an installation, then rather than have a temperature probe fitted to
each, it is possible to transfer the temperature data from one master probe to all
other units by utilising the MIDI interface. Please refer to section 12; Master/Slave
Operation for an explanation of how to implement this feature.
Please note that when a probe is first plugged in, it can take up to one minute
before the temperature appears on the display. Allow at least ten minutes for the
probe temperature to stabilise before setting delay times and if the probe is
unplugged at any time, the last measured temperature remains active.
The probe should be placed in a position away from equipment heat, out of direct
sunlight and where a typical temperature for the venue is likely to be found. A
standard screened XLR lead may be used to connect the temperature probe to the
jack adapter which plugs into the TCS-804.
Master/Transmit Slave mode
When setting up for master/slave operation it is possible to select a number of
different modes and these are selected from the utility menu.
Turn the knob to select the required mode from:
tr. -;
Press and hold to exit to normal display.
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12 Master/Slave Operation
By using the MIDI control interface it is possible to interconnect a number of TCS803 and TCS-804 units so that one unit takes on a MASTER function while other
selected ones assume a SLAVE function. In addition there are three different modes
of operation to choose from determining what data is to be transferred. Select this
from within the UTILITY menu at the same time as setting MIDI channel number.
Refer to section 10; Powering Up.
Using standard MIDI DIN connecting leads, link the MIDI OUT socket of the unit
you wish to be MASTER to the MIDI IN socket of the first SLAVE unit. Continue in
a ‘daisy chain’ fashion linking MIDI THRU to MIDI IN on all the other units that
are to be controlled. (The MIDI out socket is only used on the MASTER unit).
Be sure to set equal MIDI CHANNEL numbers for all units, and set the required
transmit mode on the MASTER.
When a master unit is first powered up, after a few seconds it will transmit all
selected parameters to the slaves. If there is any doubt as to whether the slave units
are ready to receive the initial data, check that the slaves are NOT powered up
after the master, or that cabling is done after the master is turned on. A second
initial dump of data can be sent by altering the transmit mode on the master and
then returning it back to that required. Thereafter parameters are only transmitted
from the master when they are altered.
12.1 Transmit mode ‘tr t°°’. Temperature Linking
This mode is for transferring temperature data only, between Master and Slave. It
suppresses all data except temperature on the MIDI interface and therefore allows
a BSS temperature probe connected into the master to act for all other
interconnected units. Where temperature compensation is desirable, this will avoid
having to install a BSS probe for each unit in the system.
12.2 Transmit mode ‘tr.Pr’. Transmit Program
A change in this mode means only program recall and temperature data are
transferred. When you Recall a program on the master, all other interconnected
units will respond by recalling their own program with the same number. If the
display is set to Program number on the slave units, confirmation of program
change will be shown.
Temperature data is also transferred so that the stored distance information from
the slave units' programs will allow temperature compensated delay times to be
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12.3 Transmit mode ‘tr.SL’. Transmit Slave
This is a full Master/Slave linking mode where all delay settings, in/out status, and
temperature data is transmitted by the Master unit for duplication on each slave
unit. Program recall and level information is not transmitted and remains locally
For this mode you can only mix TCS-803 and TCS-804 units within a system if the
latter is set to its mono mode, and similarly all TCS-804 units within the same
system must be set to the same mono/dual channel mode. The error message ‘Err.5’
will be displayed if this is not the case.
12.4 Transmit mode ‘tr. -’. Transmit Off
Selecting this mode allows MIDI transmit to be switched off, whilst still allowing
MIDI receive to be functional. It is of use mainly in large MIDI control setups and
controls data to the MIDI OUT socket only.
13 Linking (TCS-804 Only)
13.1 Stereo pairs
Selecting DUAL CHANNEL mode in a unit gives the possibility to link together the
delay times on each left/right group to facilitate maintaining a stable stereo image
as the overall delay time offset is adjusted.
Note that Delay 1 and Delay 2 form the first left/right group, whilst Delay 3 and
Delay 4 form the second left/right group. The following example uses the first
group numbering but it applies equally to the second group.
Set both delay 1 and delay 2 individually to minimum delay, or set an initial
imbalance if this is required in your particular situation.
Pressing both switches SIMULTANEOUSLY cause them to become linked together:
One of the delay indicator lights will now be flashing to show that this group is
linked, and that adjustment of one will drag the other with it.
Turn the knob to set the required delay, and the incremental change will be
applied EQUALLY to both delay 1 and 2.
Selecting either delay switch will display it’s absolute value, which will include
any initial offset that was entered prior to being linked.
When the switches are pressed again simultaneously, both units will become
LINKS may only be switched on or off when in the normal delay mode and not
when in Relative mode.
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Note that LINKING only applies to delay time. The individual through gain for
each output remains independent and is adjustable by the LEVEL mode as
described earlier.
13.2 Relative Delay, Mono mode
Relative delay is a display and adjustment mode that allows the assigning of either
of the four outputs as a reference such that all other outputs will be linked to it,
and dragged when the reference is moved. The relative delay between reference
and a chosen other output is also displayed.
This unique facility is invaluable when using the TCS-804 as an array alignment
tool, or when using it for loudspeaker driver offset alignment.
Enter the relative mode:
The four flashing red LEDs indicate to choose which delay is to be assigned as the
reference. Selecting delay 3 gives:
The red indicator points to delay 3 to confirm it is the reference, the green
indicator underneath shows that this is the delay currently being displayed, and the
three remaining green indicators are flashing to warn that their respective delay
outputs will all be dragged when delay three is adjusted.
Turn the knob to set the required delay, and the incremental change will be
applied EQUALLY to delay 1, 2 and 4.
Now select delay 1:
The display will show the RELATIVE delay between delay one and the reference
delay (which is delay 3).
Turn the knob to set the required delay RELATIVE to delay 3
It is possible to display and adjust the RELATIVE delay for any of the non reference
delay outputs in a similar manner.
Confirmation of the absolute delay time can be obtained by exiting the relative
mode and selecting delay display in the usual manner.
Exit relative mode, and select delay 1:
In the relative display mode both positive and negative delays are indicated to
show the true displacement. It is quite likely that you will want to select the units
to display and adjust in distance, rather than time, so that the setting up is much
more intuitive to what you are measuring.
13.3 Relative Delay, Dual Channel Mode
Relative delay is a display and adjustment mode that allows the assigning of certain
outputs as references, such that the other outputs of the pair are linked to it, and
dragged with it when it is adjusted. The relative delay between reference and the
other chosen output is also displayed.
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This unique facility is invaluable when using the TCS-804, and in the dual channel
mode there are two possible applications for relative linking depending on whether
the system is stereo, or a split band loudspeaker system correcting for array
displacement or loudspeaker driver offset.
Enter the relative mode:
Delay 1 red LED confirms that it is the reference for one group, and delay 2 and 3
red LEDs flash to indicate selection of the other reference, depending on the
chosen application. For a stereo system select delay 3 as the other reference for the
other group:
The two red indicators point to the reference outputs, and the green LED for delay
3 shows that this is the delay currently being displayed. The flashing green LED for
delay 4 is indicating that it is linked to delay 3 and will be dragged by it, when
Turn the knob to set the required delay, and the incremental change will be
applied EQUALLY to delay 3 and 4.
Now select delay 4:
The display will show the RELATIVE delay between delay 4 and the reference
delay which is delay 3.
Turn the knob to set the required delay RELATIVE to delay 3.
In a similar manner, the absolute value can be displayed and adjusted for the other
reference output, delay 1 and its associated linked output, delay 2. Confirmation of
the absolute delay time can be obtained by exiting the relative mode and selecting
delay display in the usual manner.
Exit relative mode and select delay 4:
If the other reference output has been chosen as delay 2, rather than delay 3, then
the above description of operation is still identical but with delay outputs 1 and 2
as reference pulling delays 3 and 4 with them. The indicators will confirm this
Stereo links are also active in relative mode and may cause additional delays to be
dragged by the reference.
In the relative display mode both positive and negative delays are indicated to
show true displacement. It is quite likely that you will want to select the units to
display and adjust in distance, rather than time, so that the setting up is much more
intuitive to what is being measuring.
Although seemingly complex in description, the relative mode is simple to use after
a short time. Remember: The red LED shows the reference delay, and a flashing
green LED shows a linked delay which will also be dragged when it’s reference is
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14 Applications
14.1 Time correction for audience distances
In any large public auditorium it is necessary to arrange the loudspeaker system in
clusters which are distributed around the arena to help obtain a more uniform
distribution of sound level.
For any given position within the arena a listener will be hearing a combination of
both the direct sound from the stage, and that from the nearest distributed cluster.
Because the speed of sound in air is considerably slower than that of the equivalent
electrical signal in the cable, the audible sound from the nearest cluster will be
heard by the listener slightly before that arriving from the stage. The time delay
between these two needs to be compensated for, otherwise the listener will hear
anything from a slightly unintelligible sound to one that is totally indistinct.
Both the TCS-803 and TCS-804 can be used to cure this situation by connecting
one of its delay outputs to the distributed cluster. The delay time needed will be
equivalent to the distance between the loudspeakers. Remember that the speed of
sound at 20°C is approximately 343 meters per second. This gives you a rule of
thumb of 1 msec/ft, or 3 msec/metre. When using multiple ‘delay’ clusters or when
working in stereo, it will be up to the user to decide whether it is better to use the
TCS-803 or the TCS-804 switched to mono or dual channel mode.
14.2 Time correction for speaker driver placement
When a loudspeaker sound system is constructed which utilises different
loudspeaker drivers for separate frequency bands it is not generally possible to
mechanically mount them all such that each sound source is in the same vertical
plane. The effect of this is that phase errors might occur between drivers which
produce a substantial cancellation of the signal around the crossover region, and
there can also be a general lack of transient clarity to the sound resulting from a
poor impulse response due to inaccurate combining of the wavefront arriving at
the listener.
It is the vertical displacement of the loudspeakers versus the wavelength of the
signal around the crossover region that causes the phase cancellation. Remember
that the wavelength of a 1kHz sinewave is 23cm and for a 5kHz signal it is 7cm.
For zero cancellation the vertical displacement must be in whole multiples of the
wavelength. For a good impulse response the zero phase start point for each
loudspeaker drive unit must be in the same vertical plane. Both of these criteria
will probably therefore require each MF and HF drive unit to be time delayed from
the LF drive unit.
Both the TCS-803 and the TCS-804 are ideally suited for this style of correction.
However because you need to delay after the main loudspeaker crossover, a
separate delay channel is needed for each ‘way’ of the crossover. This can be very
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wasteful of facilities and not economic for a typical three or four way stereo
A very powerful method utilising delays with a multiple loudspeaker system is to
integrate the delay into the crossover such that one multitap delay will provide all
the facilities for one channel of a sound system. The BSS FDS-360 Electronic
Crossover has built into it a special interface which will allow interconnect of
either the TCS-803 or the TCS-. For example, two TCS-803 units will then provide
all the time correction needed to correctly align a full four way stereo sound
system; a single TCS-804 unit will provide all the time correction needed to
correctly align a stereo three way system.
A special interface connector is available to assist in the connection of the delay
unit to the FDS-360 rear barrier strip.
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15 Midi Implementation
Both the TCS-803 and the TCS-804 can be controlled externally via the MIDI
control interface. All the relevant parameters are accessible where applicable.
However, both input headroom and outpupt gain are not available for the TCS-803
Delay 1
MSB 17
LSB 49
Delay 2
MSB 19
LSB 51
Delay 3
MSB 18
LSB 50
Delay 4
MSB 16
LSB 48
D1 Increment
D2 Increment
D3 Increment
D4 Increment
Level 1
Level 2
Level 3
Level 4
Headroom L
Headroom R
Store PGM
Stereo Mode
True number
160us steps up to 2.6s
x10us steps INC
32-63 x2.56ms steps INC
64-95 x10us steps DEC
96-127 x2.56us steps DEC
Gain (n-6)dB
Range ±6dB
Clip level
Range -9dBu to +20dBu
Mute 1=1, Mute 2=2, Mute 3=4, Mute
4=8. Add to combine
Temp (n-19)°C -19 to +44°C
Program (n+1) Prog 1 to 12
Switches (see notes)
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Receive Notes:
The Delay LSB must precede the MSB. If Delay LSB is not received then it is
assumed to be 0. Increment may be used to obtain resolution down to 10us.
The Stereo mode flag checks for the correct setting of the mono/stereo switch and
produces an error message if there is a conflict.
Transmit Notes:
Delay times are transmitted as LSB then MSB then INCrement.
General Notes:
Delay times are transmitted and received correctly for 20°C. If the temperature
value set on the unit is different to this, then values will automatically be adjusted.
16 BSS Temperature probe
TCS-804: To enable the temperature corrected delay time feature of the TCS-80X
series to be automatically implemented, there is an external temperature measuring
probe available as an additional option.
It is supplied mounted into an standard 3 pin XLR connector and comes complete
with an XLR to RTS jack converter. The probe plugs into the RTS jack socket on the
TCS-804 rear panel. Should you wish to mount the probe some distance away from
the unit, use a standard 3 pin balanced XLR cable as an extension.
Remember that control of a number of TCS-80X units from the one temperature
probe can be done via the MIDI control interface.
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17 Service section
17.1 Chassis/0V Link removal
For both TCS-80X units the signal 0v ground is connected to the metal chassis,
which in turn is connected to the safety ground. In the unlikely event that the link
needs to be removed, or if a small amount of impedance needs to be added to
reduce earth loop currents, then proceed as follows:
Since both the audio inputs and outputs are wired fully balanced, we suggest that
you fully check that all audio wiring is correct prior to proceeding.
CAUTION: Under NO CIRCUMSTANCES should the incoming ground wire be
disconnected from the power line cord or from the internal chassis connection as
an alternative to this procedure.
• Disconnect the mains power cord and remove the top cover from the unit.
• Locate the green wire bolted to the chassis immediately above the 9-pin 'D'
connector which terminates onto the PCB at a point marked 'AGND'.
• Remove the end of this wire link from the chassis connection, fold over and
• The signal 0v (AGND) is now separate form the chassis.
The other green wire terminated onto this chassis bolt connects the output XLR pin
1 connections to the chassis. Under NO CIRCUMSTANCES is it recommended that
this link is removed.
17.2 Transient suppressor replacement
The primary of the mains transformer within the TCS-80X is protected against high
voltage spike interference by two voltage dependent resistors. These provide a
short circuit to voltage peaks in excess of their maximum rating.
Should the TCS-80X be inadvertently connected to 3 phase line/line voltages, or to
240V when selected to 120V, or any other incorrect voltage, these suppressors are
likely to fail in a protective short circuit mode. This will be demonstrated by
repeated mains fuse failure when powering up the unit.
Even in this case of extreme overvoltage, the TCS-80X are protected against failure,
and the simple removal of these suppressors will allow the unit to be used again.
However, it is important that they are replaced as soon as possible to ensure
continued protection.
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17.3 Extended memory
The maximum available delay time can be easily extended should this be required.
Refer to the spare parts information sheet at the back of this manual for details on
part numbers for the relevant parts. You will require 2 off for the TCS-804 and 1 off
for the TCS-803.
Please remember that these chips are static sensitive and that they should be
handled with care. If you are not familiar with the correct handling procedures
then we suggest you refer the installation to your local BSS dealer.
TCS-804: FIT IC42 and IC43.
17.4 Option transformers
Provision is made internally for transformers to be fitted to the electronically
balanced inputs if required. Refer to the spare parts information sheet at the rear of
this manual for details on required parts. You will need one transformer for each
channel. The transformers are easily fitted onto the main PCB in the positions
shown. The orientation must be such that the white 'spot' on the transformer
corresponds with the ring printed on the circuit board.
Wire links LK101, LK102, LK201 and LK202 must also be cut.
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18 Warranty Information
When sold to an end user by BSS Audio or a BSS Audio Authorised Reseller, this
unit is warranted by the seller to the purchaser against defects in workmanship and
the materials used in its manufacture for a period of one year from the date of sale.
Faults arising from misuse, unauthorised modifications or accidents are not
covered under this warranty. No other warranty is expressed or implied.
If the unit is faulty it should be sent to the seller of the equipment, in its original
packaging with shipping prepaid. The unit will be returned to you when the repair
has been completed. If the unit was purchased in the European Union, you may, as
an alternative, return the unit to any other BSS distributor in the European Union.
You should include a statement listing the faults found. The unit’s serial number
must be quoted in all correspondence relating to a claim.
We recommend that you record your purchase information here for future
Dealer Name:
Dealer Address:
Post/Zip Code:
Dealer Phone No.:
Dealer Contact Name:
Invoice/Receipt No.:
Date of Purchase:
Unit Serial Number:
In keeping with our policy of continued improvement, BSS Audio reserves the right
to alter specifications without prior notice.
The TCS-80X was designed and developed by BSS Audio, Hertfordshire, England.
Phone (+44) (0)1707 660667. Fax (+44) (0)1707 660755.
World Wide Web address:
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19 Specifications
Input section: 10k ohm electronically balanced, +2-dBu maximum
input level via XLR 3-31or equivalent.
Output section: Electronically balanced and floating, capable of driving
+20dBu into 600ohms or greater via XLR 3-32 or
System performance
Conversion method:
Frequency Response:
Dynamic Range:
Group Delay Dev:
Stereo Sync:
User Memory Type:
Dynamic floating window PCM.
±0.5dB, 20Hz to 20kHz.
Typically 105dB, no pre-emphasis.
≤0.03% 20Hz - 20kHz at +10dBu level.
±7µS from 20Hz to 20kHz.
EEPROM. No batteries are required.
Delay Range - Stereo: 75µS - 650mS. (1.3 seconds Optional).
Mono: 75µS - 1.3S. (2.6 seconds Optional).
Minimum Step Size: 10µS (3.4mm at 21°C)
Input Level
TCS-804: +10dBu, ±10dB adjustable by level control.
TCS-803: -9 to +20dBu, digitally adjustable in 1dB steps.
Output Level
TCS-803: ±10dB adjustable by level control.
TCS-804: ±6dB digitally adjustable in 1dB steps.
Temperature: -19°C to +44°C manual entry or automatic with probe.
Remote pgm Select: 9 Pin submin D connector, 3 x 4 contact closure matrix
for selection of 12 programs.
MIDI: IN, THRU, OUT 5 Pin 180° DIN connector.
Temperature Probe: 0.25" RTS jack socket for BSS probe.
Input Headroom: 7 step linear showing 0dB to +20dB.
Parameters: 4 digit plus unit/status LEDs.
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AC 50VA, 50-60Hz, 120v/240v selectable externally.
Pluggable IED power cord.
Dimensions: 482 x 44 x 228mm
19 x 1.75 x 9".
Weight: 4.5kg net.
Transformer Balancing: Internal.
Memory Expansion: TCS-803 to 1.3 seconds.
TCS-804 MONO to 2.6 seconds.
TCS-804 DUAL CHN to 1.3 seconds per channel.
Temperature Probe: Allows automatic temperature compensation for delay
time. Accurate to ±3°C.
Security Cover: Mechanical fixing to supplement electronic lockout.
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