KLING & FREITAG K&F E 90 MK II - Manual (Page 11)

User’s Manual E 90 MK II
KLING & FREITAG GMBH ©1995 - 2006 Version 4.0, 02.11.2006 Page 11 of 22
7. Wiring
The speaker is equipped with two parallel Speakon connectors.
−
Make sure that all units are switched off and all controls are turned down be-
fore connecting your E 90 MK II systems.
−
We recommend the use of high-quality speaker cables provided by Kling & Freitag.
−
For connections from the mixer to the power amplifier inputs, please use 2-pin
shielded microphone cable with high-quality connectors.
−
Avoid ground loops (see chapter 7.2 )
−
Please pay attention to the respective pin diagrams in this manual!
−
Make sure that the +/- polarity of the speakers at the amplifier is correct. When
simultaneously using power amplifiers from different manufacturers, be sure to use
the correct specific pin configuration. It may be necessary to modify the pin configu-
ration on the power amplifiers or on the connectors leading to them.
−
Upon completing the wiring, ensure that the connected speaker channels are work-
ing in phase. To do so, use i.e. a phase checker. A phase error can also be recog-
nised when the connected channels are used simultaneously. During simultaneous
use the bass frequencies become notably quieter or the mid-frequencies such as
voices cannot be located.
−
To avoid loss of power, the cables should have a minimum wire gauge of 2.5 mm²
- more for longer cabled distances. A minimum wire gauge can be easily calculated
with the following formula:
If several loudspeakers are connected, the signal can be linked through from one loud-
speaker to the next. Please make sure that the total impedance of the loudspeakers R(
Ω) is
not lower than the minimal impedance indicated on the power amplifier.
1/R
1
+ 1/R
2
+ 1/R
3
+ ... = 1/R
total
7.1 Connecting the Speakon Connector to the Terminal
2.
1. 3.
1.
2.
Important
Minimum Wire Gauge (mm²) = Required Cable Length (m)
2 x Speaker Impedance (
Ω)