TOA Electronics IQ 18B User Manual
PowerDual
iQ 18B
USER MANUAL
2
CONTENTS
1. Introduction...............................................................................................................5
2. Unpacking.................................................................................................................5
3. Connectors/Cabling.................................................................................................5
4. Polarity Checking.....................................................................................................6
5. Amplification & Power Handling...............................................................................6
6. Operation..................................................................................................................6
7. Equalisation..............................................................................................................7
8. Dimensions..............................................................................................................7
9. Positioning................................................................................................................8
10. Flying......................................................................................................................9
10.1. Flying an iQ 18B............................................................................................10
10.2. Flying Double iQ 18B....................................................................................10
10.3. Flying an iQ 18B with iQ 10...........................................................................11
10.4. Flying Double iQ 18B and iQ 10....................................................................12
11. Performance Data................................................................................................13
12. Technical Specifications......................................................................................14
13. iQ 18B Service Parts and Accessories...............................................................16
14. Warranty...............................................................................................................16
3
4
1. Introduction
Thank You for purchasing Tannoy PowerDual™ iQ i8B.
The iQ 18B is a dedicated sub-woofer designed for high definition sound reinforcement
at low frequencies. It comprises an 18” driver in a horn-loaded cabinet, giving increased
efficiency and improved LF output.
For optimal performance, the iQ 18B has been designed to operate in conjunction with
the iQ 10 mid/high horn-loaded cabinet, where the system is controlled by a dedicated
loudspeaker management system TDX2.
The cabinet is constructed from high quality 18mm birch plywood, featuring handles for
easier transportation, convenient M8 flying points and a pole-mount stand socket that
serves as a base for locating the iQ 10 mid/high speakers in the air.
2. Unpacking
Every Tannoy iQ 18B is carefully tested and inspected before packing. After unpacking,
please inspect your iQ 18B for any damage sustained during transit. In the unlikely
event of any damage, would you please notify your dealer immediately and retain your
shipping carton, as your dealer may ask the faulty unit to be returned for inspection.
3. Connectors/Cabling
The iQ 18B is fitted with two 4-pole Speakon™ connectors. Speakon™ has the
following advantages over EP and XLR type connectors: All terminations are solderless,
making 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 15 mm and a current rating
of 30 Amps.
The pins of the two Speakon™ sockets, marked input/output on the rear of the speaker,
are paralleled within the enclosure.
Tannoy has adopted the following wiring standard for iQ 18B: -
SPEAKON™
CONNECTOR
Pin 1+ Positive
Pin 1- Negative
Should you encounter any problems obtaining Speakon™ connectors, please contact
Neutrik or its distributors on the following numbers: -
UK: NEUTRIK MARKETING: 01983 811 441
USA: NEUTRIK USA INC.: 732 901 9488
For a worldwide list of distributors, please contact Neutrik directly on: NEUTRIK AG: +423 237 2424
Or visit their website on http://www.neutrik.com/
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: -
SIGNAL
5
CABLE RUN
(m)
10 2.5
25 2.5
50 2.5
100 2.5
4. Polarity Checking
It is most important to check the polarity of the wiring. A simple method of doing this is
to use a pulse based polarity checker for LF units. Connect the speaker leg which you
believe to be connected to Pin 1 to the +
ve
the –
terminal of the amplifier. Check the phase as instructed by the polarity checker
manufacturer. If you have wired it correctly, the polarity checker should indicate the LF
unit is wired in phase, indicating the wiring is correct. If however the polarity checker
indicates negative phase, the input connections must be inverted.
C.S.A. OF EACH
CONDUCTOR (mm)
4.0
6.0
4.0
6.0
4.0
6.0
4.0
6.0
CABLE
RESISTANCE ΩΩ
0.14
0.09
0.06
0.35
0.22
0.14
0.69
0.43
0.29
1.38
0.86
0.58
ve
terminal of the amplifier and likewise Pin 2 to
% POWER LOSS
INTO 8ΩΩ LOAD
1.7
1.1
0.73
4.3
2.7
1.8
8.6
5.4
3.6
17.0
11.0
7.2
% POWER LOSS
INTO 4ΩΩ LOAD
3.5
2.2
1.5
8.6
5.4
3.6
17.0
11.0
7.2
35.0
22.0
14.0
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 of the loudspeaker to
be realised.
It is important when using different manufacturers amplifiers in a single installation that
they 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
compressor/limiter or active crossover is being used with multiple cabinets; it is
therefore recommended that the same amplifiers be used throughout.
6. Operation
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