Acoustical Controls - Klein + Hummel O 300 Operating Manual

switch to "LEFT"
To connect multiple O 300 D monitors together, use BNC T-piece connectors (not supplied) - see picture below. in
The digital input can be applied to either the XLR or BNC input of the first loudspeaker in the chain. BNC
connectors should be used for the rest of the loudspeakers in the chain. An appropriate setting should be made
on the rear panel signal selector switch depending on the location of the loudspeaker.
Note that the BNC connector has no output driver. When using the AES3 input, the output level is derived
passively from the AES3 signal's input level. This has a wide tolerance, therefore the length of the
interconnection cable and number of loudspeakers will depend on the level of the source signal and quality of the
interconnecting cables.
It is not possible to have an analog XLR and a digital BNC cable simultaneously connected to the loudspeaker as
the BNC connector is parallel connected to the XLR input.

Acoustical Controls

Klein + Hummel loudspeakers are designed to have a flat pass band magnitude response in anechoic conditions
when all the acoustical controls are set to 0 dB. When a loudspeaker is installed into a listening environment the
response changes and thus should be corrected back to a flat response. It is therefore expected that the controls
will need adjustment to improve the in-situ response of the loudspeaker. The acoustical controls' settings will
depend on the loudspeaker's location and will probably be different for the same loudspeaker type installed in
different locations in the same room. In a symmetrical installation, left/right pairs (front or back) will probably
have the same acoustical settings. Suggested settings are shown after this description of the controls:
The bass control is used to compensate for the effect of loading due to nearby large solid boundaries such as
walls. Four settings are available: 0, -3, -6, and -9 dB.
O 300 (D) Operating Manual
Set rear panel
BNC
Subframe A – Left signal
Subframe B – Right signal
AES3id or S/P-DIF
Digital Source
digital input connections on the O 300 D
BNC
Multiple O 300 D connections using BNC
Klein + Hummel
Set rear panel
switch to "RIGHT"
BNC
T-piece
75 Ω
Terminator
6