TL SERIES
USER MANUAL
TL-1201
TL-1501
TL-1561
TL-1500
TL-1550
TL-1800
Turbosound Ltd.
Star Road, Partridge Green
West Sussex RH13 8RY England
Tel: +44 (0)1403 711447 Fax: +44 (0)1403 710155
web: www.turbosound.com
Issue 1.0 Copyright 2001 Turbosound Ltd.
user manual
TL series
INTRODUCTION
Thanks
Thank you for choosing a TURBOSOUND TL series loudspeaker product for your application.
Please spare a little time to digest the contents of this manual, so that you can obtain the best
possible performance from this unit.
All TURBOSOUND products are carefully engineered for world class performance and reliability.
If you would like further information about this or any other TURBOSOUND product, please
We look forward to helping you in the near future.
Congratulations, you have just purchased a professional loudspeaker system from the renowned
Turbosound range, designed to give you the best in audio quality and many years of reliable,
trouble free operation. It offers superior audio quality, full technical documentation, and rigging
and flying hardware options. Please read through this manual carefully before you attempt to
operate the loudspeaker system. It contains valuable information enabling you to quickly and
easily set up and connect the loudspeakers, important system and set-up checks together with
positioning and mounting instructions.
Unpacking the TL series loudspeaker
After unpacking the unit please check carefully for damage. If damage is found, please notify the
carrier concerned at once. You, the consignee, must instigate any claim. Please retain all
packaging in case of future re-shipment.
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TL series
FEATURES
•
•
Superb audio quality: carefully designed and matched loudspeaker drive units are used to
give you exceptional performance and many years of reliable, trouble free operation.
High quality loudspeaker components are used throughout the range. Low frequency drivers
are specified for high sensitivity and durability, while high frequency drivers are selected for
consistent and reliable performance.
•
High frequency protection system: two-stage thermal overload circuits on all two way
products prevents damage to the HF drive units from both transient peaks and long term
heating effects.
•
•
•
•
•
Professional appearance: TL series enclosures are equally suited to live sound as well as
permanently installed applications.
Easy transportability: comfortable, ergonomic flush handles are provided on all TL series
enclosures for easy lifting and transportation in mobile sound reinforcement applications.
Wide dispersion: TL series enclosures are designed to give wide and even dispersion patterns
in order to maximise sound coverage over a given area from single loudspeakers.
Solid construction: all Turbosound TL series cabinets are built from high grade birch plywood
and are finished in a durable semi-matt textured paint.
Integral rigging points: fitted as standard, enabling use with optional M10 shoulder eyebolts
for many types of fixed installations. All models are type-tested for load rating to ensure safe
rigging.
•
•
Pole mount and tripod stand use is facilitated by the provision of integral pole mount fittings
on all models with the exception of the TL-1561.
Speakon NL4MP connectors are fitted to all TL series enclosures, enabling simple and easy
hook-ups as well providing loop-in / loop-out facilities to additional enclosures.
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TL series
PRODUCT RANGE SUMMARY
TL-1201
The TL-1201 is a compact trapezoidal passive two-way loudspeaker
enclosure designed for use in a wide variety of live sound
applications as well as in fixed installations ranging from cafes,
pubs, bars and restaurants to retail stores and houses of worship.
It consists of a 12” reflex-loaded low frequency driver and a 1” high
frequency compression driver in an optimally tuned, birch plywood
enclosure. These high-grade components are matched with an
internal second order passive crossover network.
Its wide dispersion pattern of 70°H x 40°V enables a variety of foreground sound applications,
including use as a delay speaker in distributed sound reinforcement system.
Two Neutrik Speakon NL4MP connectors provide input and loop in / loop out connections to the
enclosure. Internal threaded rigging points provided on the top and back are designed for use with
optional M10 shoulder eyebolts for rigging single enclosures in fixed installations. An integral
35mm pole mount is fitted for use with standard tripods and poles.
TL-1501
The TL-1501 is a trapezoidal passive two-way loudspeaker
enclosure designed for use in a wide variety of live sound
applications as well as in fixed installations ranging from
cafes, pubs, bars and restaurants to retail stores and houses of
worship.
It consists of a 15” low frequency driver and a 1” high
frequency compression driver in an optimally tuned, birch
plywood enclosure. These high-grade components are
matched with an internal second order passive crossover
network. The TL-1501 is designed to provide wide horizontal
coverage (70°H x 40°V) making it suitable for use in a variety of
foreground sound applications, including use as a delay speaker in distributed sound
reinforcement system.
Two Neutrik Speakon NL4MP connectors provide input and loop in / loop out connections to the
enclosure. Internal fixing points provided on the top and back can be used with optional M10
shoulder eyebolts for rigging single enclosures in fixed installations. An integral 35mm pole
mount is fitted for use with standard tripods and poles.
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TL series
TL-1561
The TL-1561 is a trapezoidal passive three-way loudspeaker
enclosure designed for use in a wide variety of live sound
applications as well as in fixed installations ranging from cafes,
pubs, bars and restaurants to retail stores and houses of
worship.
It consists of a front-loaded 15” low frequency driver, a front-
loaded 6.5" mid frequency driver and a 1” high frequency
compression driver on a 70°H x 40°V high frequency horn,
matched with an internal second order passive crossover
network.
The three-way design affords an increase in mid-range energy
when compared to its two-way counterpart, as well as
providing extended low frequency response due to the
increased enclosure size.
A rear panel connector plate carries two Neutrik Speakon NL4MP connectors for loop in / loop out
connections to additional enclosures. Flush handles are provided for easy lifting and carrying.
TL-1500
The TL-1500 is a trapezoidal 15” low frequency enclosure
designed to give low frequency support to TL-1201 or TL-1501
enclosures. As such it can be used in a wide variety of live
sound applications as well as in fixed installations ranging from
cafes, pubs, bars and restaurants to retail stores and houses of
worship.
It consists of a front-loaded 15” low frequency driver and an
internal high pass crossover network in an optimally tuned,
birch plywood enclosure. The cabinet is fitted with a pole mount socket in the top panel.
Two Neutrik Speakon NL4MP connectors provide input and high pass output connections to TL-
1201 or TL-1501 enclosures. Flush handles are provided for easy lifting and carrying.
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TL series
TL-1550
The TL-1550 is a trapezoidal dual 15” low frequency enclosure
designed to give low frequency support to TL-1201 or TL-1501
enclosures. As such it can be used in a wide variety of live
sound applications as well as in fixed installations ranging from
cafes, pubs, bars and restaurants to retail stores and houses of
worship.
It consists of two front-loaded 15” low frequency drivers and an
internal high pass crossover network in an optimally tuned,
birch plywood enclosure. The cabinet is fitted with a pole
mount socket in the top panel.
Two Neutrik Speakon NL4MP connectors provide input and
high pass output connections to TL-1201 or TL-1501 enclosures.
Flush handles are provided for easy lifting and carrying.
TL-1800
The TL-1800 is a trapezoidal 18” low frequency enclosure
designed to give low frequency support to TL-1201 or TL-
1501 enclosures. As such it can be used in a wide variety of
live sound applications as well as in fixed installations
ranging from cafes, pubs, bars and restaurants to retail
stores and houses of worship.
It consists of a front-loaded 18” low frequency driver and
an internal high pass crossover network in an optimally
tuned, birch plywood enclosure. The cabinet is fitted with a
pole mount socket in the top panel.
Two Neutrik Speakon NL4MP connectors provide input and high pass output connections to TL-
1201 or TL-1501 enclosures. Flush handles are provided for easy lifting and carrying.
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TL series
SYSTEM REQUIREMENTS
TL series enclosures are passive loudspeaker systems. This means that they require only one
amplifier channel for correct operation, the frequency splitting between the low frequency driver
and the high frequency driver or mid and high frequency driver in two-way and three-way
products being accomplished by the internal passive crossover network built into each enclosure.
If additional low frequency enclosures are used in conjunction with TL series two-way enclosures
to extend low frequency response, no additional amplifier channels or external electronic
crossovers are required. All TL series low frequency enclosures are equipped with internal high
pass crossover networks, splitting the full range signal and feeding the appropriate frequency
band to the two-way enclosure. Therefore a full range system consisting of, for example, a TL-
1201 and a TL-1500 can be powered from a single amplifier as shown below, thereby saving the
expense of additional amplifiers and external crossovers.
INPUT
LINK
INPUT
LINK
TL-1201
TL SERIES
INPUT
LINK
INPUT
LINK
AMPLIFIER
TL-1500
TL SERIES
1. Connect the amplifier output to the Speakon INPUT socket on the bass enclosure.
2. Then connect an additional speaker cable from the LINK socket on the bass cabinet to the
INPUT socket on the full range cabinet. Speakon pin connections are shown below.
Speakon Pin Wiring
Pin 1+ Positive
1+
Pin 1- Negative
Pin 2+ No Connection
2+
Pin 2- No Connection
Back
Front
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TL series
Amplifier considerations
Turbosound speaker enclosures should be driven by high quality power amplifiers designed for
true professional use. Such amplifiers will have balanced inputs, DC and RF fault protection, and
well-designed cooling systems for reliability. Turbosound power amplifiers such as the TMC-
T1000 are available and recommended for this purpose.
The program power listed in the loudspeaker’s technical specification is the best guide to the size
of amplifier required for general-purpose applications. The amplifier should therefore be capable
of delivering long term broadband power equal to the loudspeaker’s program power rating at the
loudspeaker’s stated nominal impedance. This approach allows sufficient headroom to generate
good dynamic range.
RECOMMENDED AMPLIFIER POWER RATINGS:
The amplifier's rated r.m.s. continuous power output (20Hz – 20kHz, per
channel) should be equal to the program power handling of the
loudspeaker at its nominal impedance.
In general, the more powerful the amplifier the better it will sound, provided that it is not driven
into sustained clipping. It should be understood that overdriving an insufficiently powered
amplifier is more likely to cause loudspeaker damage – the total energy in a heavily clipped signal
is far higher than in an unclipped signal – than operating a more powerful amplifier within its
ratings.
Equalisation
TL series enclosures are designed to provide smooth and even frequency response. They do not
need excessive amounts of external equalisation to overcome the sonic deficiencies often found in
many lesser designs.
In order to compensate for the room acoustics, TL series enclosures require only minimal
equalisation. As in any system, over-equalisation introduces phase shifts, distortion and a
reduction in headroom, usually causing more problems than it cures. Under most circumstances a
1/3 or 1/2 octave graphic equaliser will generally be adequate, with the fader settings applied
smoothly and as little as possible for the required room compensation. Most rooms will have
resonances that will be excited at particular frequencies needing some cut to help tame the sound.
These problems are most pronounced at the lower frequencies where loudspeakers generally
exhibit very little directional control. If you find that the system needs a lot of boost at lower
frequencies you may need additional sub-bass units. It is good practice to use as little equalisation
as possible, aiming to cut frequencies rather than adding large amounts of boost.
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TL series
Dispersion
TL series enclosures are designed to provide relatively wide (70°) horizontal coverage. This allows
the majority of live sound applications to be covered with enclosures placed individually to take
advantage of this performance feature, for example either side of a stage in a pub or small club
environment as shown below. The loudspeakers should be either mounted on tripod stands or
supported on straight poles on top of TL-1500, TL-1550 or TL-1800 bass enclosures. In order to
optimise the sound coverage, point the loudspeakers inwards slightly, such that the centre lines
intersect at a distance approximately equal to twice the width of the stage.
STAGE
It is possible to array TL series loudspeakers in order to achieve wider horizontal coverage and in
these applications it is recommended that the cabinets be placed such that the trapezoidal sides
are touching to ensure that the appropriate splay angle is observed. For guidance when designing
a sound system, a 70º horizontal polar pattern equals an angle of 35º either side of the centre line
at which the sound pressure level is 6dB down with respect to centre, (averaged over the whole
frequency range of the loudspeaker). Thus a 40º vertical dispersion gives an angle of 20º above
and below the horizon.
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TL series
MOUNTING AND FIXING
Rigging hardware
A versatile range of mounting hardware is available
that allows enclosures to be used in a variety of
ways, in either mobile sound reinforcement
applications or permanent installations.
A pole mount / tripod stand fitting is fitted to the
bottom of the TL-1201 and TL-1501 full range
cabinets. Use this pole mount facility with either
optional Turbosound PA-100 35mm diameter poles,
or conventional loudspeaker tripod stands. Doing so
will raise the TL-1201 or TL-1501 loudspeaker above
the heads of an audience, providing better sound
coverage from a single enclosure. A matching pole
mount socket is provided on the top of the TL-1500,
TL-1550 and TL-1800 low frequency enclosures to
accept the PA-100 pole.
All TL series cabinets, including low frequency enclosures, can be rigged in permanent
installations using optional M10 shoulder eyebolts. The top of the cabinet is provided with two
internal threaded rigging points, and a further rigging point is provided on the back panel, below
the connector plate, used to determine the amount of downward angle. As supplied, these rigging
points are fitted externally with M10 countersunk bolts. To facilitate rigging of the enclosure
simply remove these M10 bolts and replace them with M10 x 18mm shoulder eyebolts using a
suitable thread locking compound to avoid the possibility of loosening (please refer to Appendix
C: Use of thread locking compounds at the back of this manual). Note: Eyebolts must have a
thread length of at least 18mm (3/4”).
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TL series
NOTE: The rigging points are designed to suspend single enclosures only. There is no facility to
hang an additional cabinet below a flown TL series enclosure.
IMPORTANT: Any installation, whether temporary or permanent, must be securely attached to the
structure of the building using chain, steel wires or web straps which are certified and load rated
for the purpose. The combined weight of the sound system, its cables and the rigging system
must be safely carried by the points at which attachment is made to the building or structure.
Great care must be taken in selecting the attachment points and methods, being absolutely sure of
the load carrying capacity of points chosen.
NOTE: The rigging of loudspeaker systems is an extremely serious matter with potentially lethal
consequences should anything go wrong. It is of vital importance that you, or other people rigging
the system, are suitably qualified to do so and have a full understanding of all the factors involved
with safety as a number one priority. Turbosound accepts no responsibility for any accident,
damage or failure of any rigged system. This rigging information is specifically related to the
requirements of TL series enclosures only. For more detailed information on the whole topic of
rigging various handbooks are available. If you are in any doubt contact your Turbosound dealer
who will be able to refer you to an experienced rigging company.
Choosing the best location
When using any TL series system, certain room parameters will affect the resultant sound quality
and coverage. For example, any boundary like a wall or floor will lift certain frequencies. If you are
placing the unit in a corner then a lift at the bass end is to be expected and it may sound rather
boomy. This can be compensated for moving the speaker or cutting low frequencies with a
graphic equaliser.
When speakers are flown in free space then boundary effects are minimised. The result is a
smooth frequency response without any boost at odd frequencies, but the bass end may appear
subjectively light. In this case increase the sub-bass level to bring the low end up.
The relationship between sound pressure level and distance is an “inverse square law” so
remember that every time the distance from the sound source is doubled the sound level
decreases by 6dB. For every 3dB increase of speaker output you need a doubling of input power
and you can work out the wattage input needed to give the required SPL levels at various
distances from the loudspeaker(s).
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TL series
MAINTENANCE
If any of the drive units in your TL series cabinet should cease functioning and need a replacement
recone or diaphragm, you are advised to remove the faulty unit from the cabinet and send it to a
professional service centre authorised to recone and repair Turbosound loudspeakers.
Removal of the low frequency driver(s)
The perforated steel loudspeaker grille is held in place under tension only, fitting into slots at
either side of the baffle. There are no screws or other fixings holding the grille in place.
1. Lay the cabinet on its back and, using two small screwdrivers inserted through the mesh of
the grille, firmly pull the grille away from the slot at one side of the baffle until it is free. Set
the grille aside for later re-assembly.
2. Undo the four screws holding the driver(s) in place and carefully lift it out and away from the
cabinet. Make a note of the driver polarity for later reconnection. Disconnect the cables from
the drive unit and completely remove the driver from the cabinet.
3. To reinstate the driver(s) simply reverse the above procedure, making sure you observe the
correct polarity when reconnecting the cables back into the terminals of the drive units.
Removal of the mid frequency driver
1. Remove the loudspeaker grille as described above and set the grille aside for later re-fitting.
2. Undo the four screws holding the driver(s) in place and carefully lift it out and away from the
cabinet. Make a note of the driver polarity for later reconnection. Disconnect the cables from
the drive unit and completely remove the driver from the cabinet. To reinstate the driver
simply reverse the above procedure, making sure you observe the correct polarity when
reconnecting the cables back into the terminals of the drive units.
Removal of the high frequency compression driver
1. Remove the loudspeaker grille as described above and set the grille aside for later re-fitting.
2. Remove the horn/driver assembly by unscrewing the four screws holding the flange in place.
Lift it out and away from the cabinet.
3. The high frequency driver can now be disassembled from the HF horn.
4. To reinstate the high frequency horn and compression driver, simply reverse the above
procedure making sure you observe the correct polarity when reconnecting the cables back
into the terminals of the drive unit.
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TL series
APPENDIX A
Use of thread locking compounds
When assembling flying hardware to TL series loudspeaker enclosures it is advisable to use
thread-locking compounds to eyebolts and other bolts in order to avoid any possibility of
loosening.
The recommended thread-locking compound is Loctite 222.
The threaded rigging points used in TL series enclosures are manufactured from zinc-plated mild
steel. Therefore, and additionally if the external bolts used are zinc-plated, zinc-passivated,
stainless steel or anodised (as the majority are), then the corresponding activator, Loctite 7471,
should be used to achieve 100% performance.
Application: Spray Loctite 7471 into the thread holes and allow to evaporate. Apply Loctite 222
thread locking compound to the bolts prior to fitting, allowing sufficient to fill all the engaged
threads. Assemble components and tighten as necessary.
The parts may be disassembled by hand if required.
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TL series
APPENDIX B
Spares and Accessories
CD-106
1” HF compression driver
Replacement diaphragm for CD-106
6.5” MF loudspeaker
RD-106
LS-6504
RC-6504
LS-1211
RC-1211
LS-1514
RC-1514
LS-1807
RC-1807
MG-1201
MG-1501
MG-1561
MG-1500
MG-1550
MG-1800
PX-1201
PX-1501
PX-1561
PX-1500
PX-1550
PX-1800
Recone kit for LS-6504
12” LF loudspeaker
Recone kit for LS-1211
15” LF loudspeaker
Recone kit for LS-1514
18" LF loudspeaker
Recone kit for LS-1807
Metal grille for TL-1201
Metal grille for TL-1501
Metal grille for TL-1561
Metal grille for TL-1500
Metal grille for TL-1550
Metal grille for TL-1800
Passive crossover network for TL-1201
Passive crossover network for TL-1501
Passive crossover network for TL-1561
Passive crossover network for TL-1500
Passive crossover network for TL-1550
Passive crossover network for TL-1800
Flying Accessories
EB-10
M10 x 18mm shoulder eyebolt
35mm straight pole
PA-100
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TL series
APPENDIX C
Technical Specifications
TL-1201
TL-1501
TL-1561
Dimensions
(H x W x D)
550mm x 395mm x 383mm
(21.6” x 15.5” x 15”)
635mm x 480mm x 465mm
(25” x 18.9” x 18.3”)
810mm x 480mm x 465mm
(31.9” x 18.9” x 18.3”)
Net weight
21kg (46.2lbs)
26kg (57.2lbs)
32kg (70.4lbs)
Components
1 x 12” LF driver
1 x 15” LF driver
1 x 15” LF driver
1 x 1” HF compression driver
1 x 1” HF compression driver
1 x 6.5” MF driver
1 x 1” HF compression driver
Frequency response
Nominal dispersion
Sensitivity
54Hz – 20kHz ±6dB
46Hz – 20kHz ±6dB
42Hz – 20kHz ±6dB
70°H x 40°V @-6dB pts
98dB, 1 watt @ 1metre
70°H x 40°V @-6dB pts
99Db, 1 watt @ 1metre
70°H x 40°V @-6dB pts
98dB, 1 watt @ 1 metre
Power handling
250 watts r.m.s.
300 watts r.m.s.
300 watt r.m.s.
500 watts program
600 watts program
600 watts program
Maximum SPL
122dB continuous
128dB peak
124dB continuous
130dB peak
123dB continuous
129dB peak
Construction
Grille
15mm (5/8”) birch plywood
15mm (5/8”) birch plywood
15mm (5/8”) birch plywood
Powder coated perforated steel
mesh
Powder coated perforated steel
mesh
Powder coated perforated steel
mesh
Connectors
(2) Speakon NL4MP wired
pin 1+ positive,
(2) Speakon NL4MP wired
pin 1+ positive,
(2) Speakon NL4MP wired
pin 1+ positive,
pin 1- negative
pin 1- negative
pin 1- negative
Due to continuing product improvement the above specifications are subject to change.
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TL series
TL-1500
TL-1550
TL-1800
Dimensions
(H x W x D)
530mm x 480mm x 465mm
(20.9” x 18.9” x 18.3”)
875mm x 480mm x 465mm
(34.4” x 18.9” x 18.3”)
600mm x 500mm x 485mm
(23.6” x 19.7” x 19”)
Net weight
23kg (50.6lbs)
37kg (81.4lbs)
26kg (57.2lbs)
Components
1 x 15” LF driver
50Hz – 225Hz ±6dB
99dB, 1 watt @ 1metre
2 x 15” LF drivers
50Hz – 225Hz ±6dB
101dB, 1 watt @ 1metre
1 x 18” LF driver
Frequency response
Sensitivity
42Hz – 225Hz ±6dB
97dB, 1 watt @ 1 metre
Power handling
300 watts r.m.s.
600 watts r.m.s.
350 watt r.m.s.
600 watts program
1200 watts program
700 watts program
Maximum SPL
122dB continuous
128dB peak
124dB continuous
130dB peak
123dB continuous
129dB peak
Construction
Grille
15mm (5/8”) birch plywood
15mm (5/8”) birch plywood
15mm (5/8”) birch plywood
Powder coated perforated steel
mesh
Powder coated perforated steel
mesh
Powder coated perforated steel
mesh
Connectors
(2) Speakon NL4MP wired
pin 1+ positive,
(2) Speakon NL4MP wired
pin 1+ positive,
(2) Speakon NL4MP wired
pin 1+ positive,
pin 1- negative
pin 1- negative
pin 1- negative
Due to continuing product improvement the above specifications are subject to change.
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TL series
APPENDIX D
Limited Warranty
This Turbosound loudspeaker product is warranted to the original end-user purchaser and all
subsequent owners for a period of two (2) years from the original date of purchase.
Warranty Coverage
Warranty coverage includes defects in materials and workmanship. It does not include:
•
•
damage caused by accident, misuse, abuse, neglect or modification by any person other than
an authorised Turbosound representative,
damage caused by failure to operate the product in accordance with the instructions
contained in the user manual,
•
•
•
damage occurring during shipment in transit,
claims based on any misrepresentation by the seller,
products which do not have the original components as specified in the product engineering
information,
•
products on which the serial number has been removed or defaced.
Shipping
Should any fault develop with a component of your Turbosound system, please return the
product, freight pre-paid, in its original packing carton, along with proof of purchase such as the
original bill of sale or receipted invoice, and a description of the suspected fault to Turbosound
Ltd. (Att: Customer Service), Star Road, Partridge Green, West Sussex RH13 8RY, England, or your
local authorised Turbosound representative. The product serial number must be quoted in all
correspondence relating to the claim. Insurance is recommended, as Turbosound or its
representatives are not liable for loss or damage in transit. Turbosound will pay for return freight
costs should repairs be covered under warranty.
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TL series
Incidental and consequential damages
Turbosound's liability is limited to the repair or replacement, at our option, of any defective
product, and shall not be liable for any incidental and consequential damages including, without
limitation, injury to persons or property or loss of use.
Limitation of implied warranties
All implied warranties, including warranties of merchantability and fitness for a particular
purpose, are limited in duration to the length of this warranty.
This warranty is in addition to, and in no way detracts from, your statutory rights as a consumer.
No other warranty is expressed or implied.
Please record your purchase information below for future reference:
Dealer Name _______________________________________________________________________
Dealer Address ____________________________________________________________________
___________________________________________________________________________________
___________________________________________________________________________________
Post / Zip Code _____________________________________________________________________
Dealer telephone / fax ______________________________________________________________
Invoice number ____________________________________________________________________
Date of purchase ___________________________________________________________________
Unit serial number _________________________________________________________________
TL series manual
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Turbosound Ltd.
Star Road, Partridge Green
West Sussex RH13 8RY England
Tel: +44 (0)1403 711447 Fax: +44 (0)1403 710155
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