Polarity Checking - Tannoy i8 AW User Manual

Should you encounter any problems obtaining Speakon connectors, please contact
Neutrik or its distributors directly on the following numbers: -
UK: NEUTRIK MARKETING
USA: NEUTRIK USA INC .:
For a world wide list of distributors, please contact Neutrik directly: -
NEUTRIK AG
or visit their website at: 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 variati ons (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:-
CABLE RUN
(m)
10
25
50
100

4. Polarity Checking

It is most important to check the polarity of the wiring. A simple method of doing this
without a pulse based polarity checker fo r LF units is as follows: Connect two wires to
the +ve and - ve terminals of a PP3 battery. Apply the wire which is connected to the
+ve terminal of the battery to the speaker cable leg which you believe to be connected
to the red speaker terminal and likew ise the - ve leg of the battery to the black speaker
terminal.
If you have wired it correctly the LF drive unit will move forward, indicating the wiring is
correct. All that remains now is to connect the +ve speaker lead to the +ve terminal on
the amplifier and the - ve lead to the - ve terminal on the amplifier. If however the LF
driver moves backwards, the input connections should 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, so if you are using amplifiers from more than one manufacturer,
check the polarity at the amplifiers as well as the loudspeakers.
4
:
C.S.A. OF EACH CABLE
CONDUCTOR (mm) RESISTANCE Ω
2.5 0.14
4.0 0.09
6.0 0.06
2.5 0.35
4.0 0.22
6.0 0.14
2.5 0.69
4.0 0.43
6.0 0.29
2.5 1.38
4.0 0.86
6.0 0.58
01983 811 441
1 732 901 9488
+423 237 2424
% POWER LOSS
INTO 8Ω 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 4Ω 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