TOA Electronics IQ 18B User Manual

Loading...

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™

SIGNAL

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: -

5

CABLE RUN

C.S.A. OF EACH

CABLE

% POWER LOSS

% POWER LOSS

(m)

CONDUCTOR (mm)

RESISTANCE Ω

INTO 8Ω LOAD

INTO 4Ω LOAD

10

2.5

0.14

1.7

3.5

 

4.0

0.09

1.1

2.2

 

6.0

0.06

0.73

1.5

25

2.5

0.35

4.3

8.6

 

4.0

0.22

2.7

5.4

 

6.0

0.14

1.8

3.6

50

2.5

0.69

8.6

17.0

 

4.0

0.43

5.4

11.0

 

6.0

0.29

3.6

7.2

100

2.5

1.38

17.0

35.0

 

4.0

0.86

11.0

22.0

 

6.0

0.58

7.2

14.0

4. Polarity Checking

It is most important to check the polarity of the wiring. 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 terminal of the amplifier and likewise Pin 2 to the –ve 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.

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

6

+ 13 hidden pages