Sherbourn PRE-1 Anleitung zur Fehlerbehebung PDF herunterladen (Seite 9)

Installation and Connections

AC Power Considerations

The majority of household electrical sockets (in places

other than the kitchen and garage) are 15 amperes maxim-

um, which is sufficient to power your Sherbourn amplifi-

er. However, remember to account for the electrical power

that other components will require if they share a common

wall socket or electrical circuit. Most DVD players,

preamplifiers and A/V source units are fairly low current

items, and can successfully share a wall socket with your

power amplifier, but big screen TVs and video projectors

usually have minimum current requirements that can con-

sume nearly an entire circuit. Refer to the owner’s manu-

als of your audio/video devices to assess your electrical

power requirements for your home entertainment system.

If you have any questions relating to issues with the power

requirements for your Sherbourn amplifier, please contact

Sherbourn Support at: 978-663-7385.

Surge Protection - Along with built-in noise filtering,

your Sherbourn amplifier is equipped with overcurrent,

undercurrent, and spike protection.

Upon powering up your Sherbourn amplifier with the

front panel switch or via 3.5mm trigger input (switch on

the rear panel must be set to “ON”), you will notice the

front panel LED lighting starts off red for 5 seconds and

then turns to blue. This indicates the amplifier is “ON,”

functioning normally, and ready for operation. If you do

not see an LED light or a blinking red LED light while the

amplifier is on during (otherwise) normal operation,

please refer to the troubleshooting section of this manual.

Physical Placement /Heat Considerations

Sherbourn series amplifiers employ convection cooling,

which is very effective and completely noiseless. Under

normal operating conditions, your Sherbourn amplifier

will remain cool to mildly warm, but considerations for

heat should be taken into account during placement.

Place your Sherbourn amplifier on a flat, level surface,

with the weight distributed equally on all four feet. If us-

ing a cabinet or shelf, please make sure that there is suffi-

cient ventilation and there is at least 6 inches of free air

space above the amplifier and 3 inches on each side. If ad-

equate ventilation is not available, your may consider in-

stalling two small brushless DC fans (such as those used

in computer cases) to provide continuous airflow around

the unit. If the amplifier is located on a carpeted surface,

place a board under the amplifier’s feet.

Do NOT block the ventilation holes on the amplifier.

Your Sherbourn amplifier is equipped with a massive tor-

oidal power transformer. This transformer generates a

magnetic field that could induce a hum in a turntable (par-

ticularly a turntable equipped with a moving coil cart-

ridge). Do NOT place a turntable directly above or dir-

ectly adjacent to the amplifier.

Before placing the amplifier on a shelf, verify that the

weight bearing capacity of the shelf is 80 lbs or greater.

The amplifier is heavy and should be placed toward the

bottom of an audio rack to minimize the rack being unne-

cessarily top heavy.

Input Connection Considerations

High quality, fully shielded RCA cables are recommen-

ded for use with Sherbourn amplifiers. ‘Twisted Pair’

cables are not recommended. Sherbourn amplifiers have

an extremely high bandwidth, and twisted, non-shielded

cables can actually act as an ‘antenna’, receiving outside

interference and signals (EMI and RFI), which will cause

the amplifier to go into protect mode.

Whenever possible, keep preamplifier level audio cables

away from amplifier electrical power cords by at least a

few inches. Amplifier AC power cords are carrying much

more current than other source and preamplifier compon-

ents, which means there is a larger degree of noise or

“hum” potential with the amplifier power cord in close

proximity.

Output Connection Considerations

The output connectors provided on each channel of Sher-

bourn amplifiers are standard “binding post” speaker con-

nectors with industry standard spacing. These are some-

times called 5-way binding posts because of the many

ways in which the speaker wire can connect into the posts.

The posts can accept bare wire, spade terminals, and dual

or single banana connectors. Spade connections or banana

plugs ensure a simple, solid fit in the terminal whereas

bare wire may be awkward when the terminal is screwed

down to compress the wire into place. Keep in mind that if

you use “dual banana” plugs and “stack” them, you will

be creating a parallel connection. For more details on

series and parallel connections, see pages 13-14.

It is important to observe polarity so that the speaker wire

connects to the red and black terminals on the amplifier

and the corresponding terminals at the speaker. Also, make

sure that the positive speaker wires do not touch the negat-

ive speaker wires, or any chassis metal. This will cause a

short circuit and activate the protection circuitry.

Connection Tips for Superior Sound

Before setting up your new system, please consider the

following:

• Always make sure the amplifier is turned off before

making or changing ANY connections.

• Whenever possible, route the power cords away from

the signal cables or speaker wires to prevent any hum

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