Harman Lexicon DD-8 Guía De Usuario página 9

DD-8 Power Amplifiers
BaSIc operatIon
3. Local Inputs
Provides a line-level RCA connector input to feed a corresponding speaker-level output channel.
When the DD-8 is used as a multi-zone amplifier, each channel can be provided with a dedicated input
signal. The signals from this input will only be available on the corresponding speaker-level output.
Local inputs are grouped and identified in pairs with the labels A, B, C and D and channel numbers 1-8
on the rear panel of the DD-8. These labels can be utilized to easily identify corresponding controls
and connections for selecting desired output configurations.
4. Output Level Controls
Provides speaker-level attenuation for each output channel.
The output level controls function as attenuators for each channel and can be used to level-match
speakers in an installation. The center detent is the default position that will be appropriate for most
speakers with +13dB or -76dB of adjustment from default available as needed. These controls are
labeled in pairs A, B, C and D and with channel numbers 1-8 to easily identify which speaker-level
output is being adjusted.
5. Stereo/Mono Selection
Selects between Stereo and Mono output configuration for each group of speaker output pairs.
When using the DD-8 in standard stereo operation, select the Stereo position. In this mode, the
Left and Right stereo input signals remain intact and are output at the corresponding left and right
speaker connection. The DD-8 provides connectivity for four stereo pair of loudspeakers (A, B, C and
D) when configured in Stereo mode.
It is possible to combine a stereo bus or local input signal onto two single output channels by
selecting the Mono position for that channel pair. This mode is useful for instances where two
normally stereo speakers are located far apart and it is desirable to send a combined left and right
channel signal to both speakers simultaneously in order to maintain optimal fidelity.
If desired, the DD-8 can be utilized in all mono operation. In this mode, all eight channels can be
used independently with either a single mono bus input signal or eight independent mono local
input signals. As notated in the bus and local input descriptions, using only one input connector will
attenuate the gain by 6dB. A "Y-adaptor" RCA cable can be used at the input to maintain full gain if
desired.
6. Local/Bus Selection
Selects between Local and Bus inputs for each group of speaker output pairs.
The Local/Bus input selection provides the ability to easily configure the DD-8 either as a single-zone
or multi-zone amplifier. The speaker outputs are grouped in pairs A, B, C and D (channels 1-8) with a
switch for each pair. For example, selecting the Bus input for speaker output pair A (channels 1 and
2) will route the input signal from the Bus input to speaker output pair A. Selecting the Local input
for speaker output pair A (channels 1 and 2) will route the input signal from the Local input pair A
(channels 1 and 2) to speaker output pair A.
Operation Manual 9