Rear Panel Functions. Plinius SB-301 Power Amplifier

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Rear Panel Functions. Plinius SB-301 Power Amplifier | Manualzz

Rear Panel Functions

This panel incorporates all the terminals for connecting the input signals from your preamplifier and output to the loudspeakers and mains supply. Be sure that you understand your system’s requirements fully before you make any connection to this amplifier.

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1. INPUT TERMINALS

Input terminals for your Plinius SB-301 MKII Power Amplifier are easily accessible and fitted near the top centre area of the rear panel.

RCA INPUTS: These standard RCA terminals are for use with unbalanced signals from most signal sources such as audio preamplifiers.

XLR BALANCED INPUTS: XLR connectors fitted to this amplifier are for use with balanced line signals from audio preamplifiers. Balanced signals are carried via a three way cable that connects all three pins at each end of the interconnect cable.

The XLR input pin configuration used in all Plinius products is as follows:

PIN 1 to GND

PIN 2 to +Signal

PIN 3 to -Signal

NOTE: Because of the way balanced XLR inputs are configured it is not possible to connect both XLR and RCA at the same time.

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2. AMPLIFIER CONFIGURATION SELECTOR (ACS)

The Amplifier Configuration Selector (ACS) is a unique switching method that exploits all of the operational features of your Plinius SB-301 MKII Power Amplifier. By using this switch it is possible to operate your amplifier with either balanced or unbalanced signals.

The ACS switch options are:

• RCA STEREO: This option provides a stereo output via both left and right output channels from a stereo signal connected to both left and right input RCA inputs.

• XLR STEREO: This option provides a stereo output signal from a balanced stereo input signal connected to both the left and right XLR inputs.

BALANCED/UNBALANCED SIGNALS

Balanced or unbalanced input options will depend on the type of signal available from your preamplifier or other equipment. The Plinius SB-301 MKII provides both options to allow you to choose the most suitable preamplifier for your purposes. Plinius preamplifiers offer both balanced and unbalanced output options.

Balanced line is normally used to transmit signals in a professional environment.

Because balanced line effectively reduces or eliminates noise pick-up by the system cabling, it has become increasingly more important in high-quality domestic high fidelity systems.

Unbalanced leads such as single ended, RCA or coaxial are common and are used in the majority of audio signal systems. The terminal plug and socket are most commonly called RCA and can be found on your Plinius SB-301 MKII for use as the standard input terminals for both left and right inputs.

3. OUTPUT TERMINALS

Output connections for the loudspeakers are provided on the left and right hand side of the rear panel. Two parallel pairs of binding posts for each channel are fitted – these provide ease of use with bi-wiring and multiple cables requiring a large contact area.

4. MAINS SWITCH

This heavy-duty rocker switch in the centre of the panel turns the Mains/Line Power to the amplifier ON or OFF. An LED in the centre of the front panel indicates that the power is on. When first switched on the power LED will vary in brightness for ten seconds – this is an initialisation sequence, after which the power LED remains lit. The amplifier draws a moderately high current when switched on. Despite the

“Soft Start Circuit” within the amplifier reducing current demand on the mains as the amplifier is switched on, it is not good practice to rapidly turn the Mains switch on and off repeatedly.

5. MAINS POWER CORD IEC CONNECTOR

This connector is where the mains supply cable from your wall connects to the

POWER AMPLIFIER 9

amplifier. You will notice that a fuse holder is mounted within this connection, and it holds a mains fuse to provide surge and overload protection for your amplifier.

6. REMOTE TRIGGER TERMINALS

In order to integrate more effectively into a home theatre or multimedia system, the Plinius SB-301 MKII has remote trigger terminals fitted to the rear panel. By connecting a processor with a remote trigger signal to these terminals, the SB-301

MKII can be put in and out of Standby by the processor to which it is connected.

When in Standby the amplifier draws less current and will operate at minimum temperature. The output relays are also open, disconnecting the loudspeakers. This may be of advantage in a multi-amplifier and/or remote installations. Polarity of the connections to the remote trigger is not important.

7. GROUND LIFT SWITCH

This switch is located adjacent to the Mains Input Socket, and allows the signal ground to be disconnected from the chassis. In some installations a hum loop may exist due to duplicate ground paths from different equipment. Use this switch to remove the connection from 0V to ground thus allowing some flexibility in your particular set-up. Note that when using Balanced XLR inputs, the ground lift switch should always be set to ‘chassis’.

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