Sherbourn PRE-1 Anleitung zur Fehlerbehebung PDF herunterladen (Seite 11)

ohm speakers in series is an eight-ohm load. Series con-

nections are easier on the amplifier than parallel connec-

tions as the total impedance is higher than driving a single

speaker.

Parallel Connections

A parallel circuit is established when voice coils are con-

nected in a way that there are multiple paths for audio sig-

nals to flow “in” and multiple paths for audio signals to

flow “out”. When speakers are connected in parallel, the

total resistance at the amplifier is proportionally divided

based on the value of each individual voice coil resistance.

The term “divided” simply means all of the values togeth-

er in parallel are a SMALLER value than each all by it-

self. For example, if you were to parallel connect two

speakers to the front right channel of the amplifier; the

positive output terminal of the right channel connects to

the positive input post of the first speaker and to the posit-

ive post of the second speaker.

The negative output terminal of the right channel connects

to the negative input post of the first speaker and to the

negative post of the second speaker.

The total impedance of equal speakers in parallel is found

by dividing the impedance of one speaker by the number

of speakers. For example; two eight-ohm speakers in par-

allel is a four-ohm load (eight ohms divided by two), four

eight-ohm speakers in parallel is a two-ohm load (eight

ohms divided by four). Two-ohm single channel loads are

NOT RECOMMENDED for Sherbourn amplifiers!

Running your amplifier below recommended imped-

ance level can cause excessive heat and will eventually

drive the amplifier into protect mode (blinking red

LED’s on the front of the unit).

Parallel connections are harder on the amplifier than series

connection, as the total impedance is lower compared to

driving a single speaker, and the amplifier must produce

more current to drive them. Ideally, the total average im-

pedance should be no less than 4 ohms per channel. You

must make sure that the lower impedance does not cause

the amplifier to overheat, shut down, blow the line fuse, or

trip your circuit breaker. If this happens, you should re-

duce the number of speakers wired in parallel, rewire them

in series, or use more than one power amplifier.

Technical Note about Multiple Speaker Connec-

tions

Although there are two possible connection types dis-

cussed in this manual, it is imperative that with either con-

nection type that you use loudspeakers of the same type

and nominal impedance for these connections. In doing so,

you have the most predictable outcome for your installa-

tion. When speakers of different nominal impedances

and/or different bandwidths are used, there are many other

acoustic problems that come into play in addition to com-

plex impedance at the amplifier’s speaker output termin-

als. If you must use multiple speakers on any individual

amplifier channel, please use speakers as close to identical

as possible.

Troubleshooting Guide

Sherbourn Series amplifiers are expertly designed and

built to provide years of trouble-free performance. Most

problems that occur can usually be solved by checking

your setup or making sure that the audio and video com-

ponents connected to the amplifier are on and fully opera-

tional.

Note: Before turning on your amplifier for the first

time, be sure to check:

1. The Balanced / Unbalanced selectors for each ampli-

fier channel (located on the back panel). If the selection

does not match the connection, the channel will not work.

Make sure you are selecting the proper type of connection

for the cables you are using.

2. The status and meter LED selectors on the rear pan-

el. If these are in the 'off' position, the status and meter

LEDs will not light.

The following information will help you deal with com-

mon setup problems you may experience during normal

use of your unit. If problems persist, contact Sherbourn

support for help.

No Sound (from one or more speakers connected to the

amplifier)

• Speaker cables may have come undone. Turn off your

system and check the cables, tighten the amplifier

and speaker binding posts.

• Damaged audio cable.

• The preamplifier volume level is low for the channels

concerned. Recheck the preamplifier calibration pro-

cedure.

• A preamplifier Mute switch may be on, an external

processor loop or a tape monitor loop is engaged.

• Check that your preamplifier or source is running the

correct surround mode. Maybe it is set for 2-channel

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