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O 810 / O 870 Operating Manual Page 9 of 96

Version 01

Format

(Connector)

Impedance

Cable Length

S/P-DIF (RCA)

Ω

up to 10 m (30’)

AES3 (XLR)

110

Ω

up to 100 m (300’)

AES3id (BNC)

Ω

up to 1000 m (3000’)

An AES3 signal (applied to an XLR connector) is point-to-point and may not be looped. An AES3id or S/P-DIF
signal can be applied to a BNC connector. The BNC input stage has an internal 75

Ω

termination so T-pieces and

terminators are not required. A consequence of this is that it is not recommended to loop the signal to other
equipment using T-pieces. Digital audio errors on any one of the inputs are indicated by a flashing POWER ON
light. If this happens check the cables and connectors, and the source equipment.

User-bit volume control (IEC 60958-1) may be used for muting input channels: set gain to -

∞

. Channel soloing is

also possible by muting the other input channels (must be handled by the source). Channel volume control is not
supported. The source must support the IEC 60958-1 standard for muting and soloing to work – see information
provided by the manufacturer of the source to see how it has been implemented. System volume is still possible
by the using the remote control socket (SRC n or RS-232) to control the analog output VOL control blocks without
having to scale the digital signal.

A common problem in television broadcast facilities is audio-video synchronization. The video signal must be
delayed if the video leads the audio, however normally the video lags the audio so the audio should be delayed.
This can be accomplished using the built-in 8-channel digital delay which is located just before the DACs. A time
delay can be applied equally to all eight input channels to compensate for delayed video signals. This facility is
not designed for compensation of loudspeaker time-of-flight differences as this should be inserted at each
loudspeaker output, not at the input channels to the bass manager. The time length of a frame depends on the
picture frame rate frequency: 50 Hz

→

20 ms or 60 Hz

→

16.5 ms. The sample rate is automatically detected and

affects the maximum possible delay – higher sample rates lead to a lower maximum delay. The maximum delay
on a 48 kHz signal is 507 ms, which can compensate over 12 x 50 Hz frames or 15 x 60 Hz frames. To set the
delay on the DIM 4, use the free “DIM 4 Setup” software (available for PC and Mac - downloadable from
www.klein-hummel.com), and the “Remote Control and RS-232” socket (USB-to-RS232 and RS232-to-CAT5
interface cables may be required). Alternatively, user-bits (IEC 60958-1) may be used for setting system delay by
sending appropriate commands to input stage 1 subframe A (left channel). User-bit data on other channels
relating to loudspeaker delay is ignored.

DIM 4 setup software

In addition on the DIM 4, the 7 main channels are summed and the LFE input has a 0 / +10 dB gain stage. Finally,
the test signal is routed onto the left input for reproduction by the subwoofer and left loudspeaker (see
Calibrating Phase section).

Warning:

Warning:

Warning: The digital input option’s BNC connectors protrude from the cabinet’s back panel. The circuit board will
be damaged if the cabinet is placed vertically on a flat hard surface with the driver(s) facing upwards (only
recommended when servicing the driver(s)). Find a soft surface, such as bubble wrap, packing foam, or a folded
blanket, or angle the cabinet slightly to avoid applying pressure to the BNC connectors.

Loudspeaker

Level

System Delay

Left

00.0

Delay

200.0

Center

00.0

Sample Rate

kHz

Right