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INPUT CONFIGURATION SWITCH
Mono / 2 Ch
The amplifier operates in two-channel mode when the rear panel Mono/2 Ch switch is in the 2 Ch position. To use the amplifier
in single channel, bridged mono applications, the front panel switch must be in the Mono position. When in Mono, the Channel
1 (+) and (–) inputs are connected to Channel 2 in reversed polarity, which inverts the Channel 2 output. Only the Channel 1
input is used, and the speaker is connected to the two positive (+) output terminals.
For thermal considerations we do not recommend using less than a nominal eight ohm load on the amplifier when running it in
bridged mono.
Por consideraciones térmicas, no recomendamos el uso de una carga nominal menor de ocho ohmios cuando el amplificador
esté trabajando en el modo puente.
Pour de raisons thermales, nous ne recommandons pas d'envoyer à l'amplificateur, une charge de valeur nominale inférieure
à huit ohm, au moment du fonctionement en mode “mono.”
Um thermische Störungen zu vermeiden, empfehlen wir in der mono Brückenschaltung die minimale Last von 8 Ohm nicht
zu unterschreiten.
Per ragioni di natura termale non consigliamo l'uso di un carico nominale dell'amplifiactore inferiore a 8 ohm nel caso di
funzionamento monofonico ostruito.
GROUND SWITCH
Ground loops are characterized by a hum or buzz in the system and are caused by a voltage potential difference
between two points in a ground circuit. Ground loops are aggravated when multiple paths exist for a given circuit.
Mounting components in a rack with metal rails may introduce ground loops between associated equipment,
because the rails can establish an additional ground path.
The CHASSIS/FLOAT switch allows you to select the amplifier grounding scheme for best system compatibility. With
the switch in the CHASSIS position all signal grounds are referred to the chassis and power line ground.
In the FLOAT position the signal ground is decoupled from the chassis. The position of the switch is determined by
the overall noise in the system; choose the position which gives the lowest hum.
LOAD FAULT PROTECTION
Because of the self-protecting properties and fault tolerance of the lateral MOSFETs used in the 9505, elaborate
voltage and current limiting protection schemes are not necessary. To prevent damage to the amplifier from a fault
in the loudspeaker load, the power supply B+ and B– rails are fused. Check these fuses if the sound is garbled or there
is no output. The fuses should not blow under normal use and a blown fuse is usually an indication of a fault. The
fault could be a bad connection, a problem with the speaker or a short in the speaker line. Disconnect power to the
amplifier before removing the cover.
WARM UP
In order to achieve the best sonic performance from the amplifier, we recommend letting it warm up for 1 hour before
beginning any critical listening. The amplifier will not deliver its full potential sound quality before this time has
passed.
CLEANING AND MAINTENANCE
There is no requirement for regular maintenance on the electronic components of the amplifier. If the case becomes
soiled it can be cleaned using a soft cloth and a mild detergent, such as spray window or glass cleaner. If the amplifier
is located in a particularly dusty environment cleaning the inside with compressed air or vacuuming every 18 to 24
months is sufficient.
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