A&R Power Amplifier SA200 Podręcznik użytkownika - Strona 5
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Drukuj stronęLoudspeaker Connections
The outputs of the SA150 and SA200 are suitable for driving loudspeakers of 4 ohms nominal
impedance or higher. Both models will drive 4 ohm loads whose impedance dips to as low as
2 ohms, but care should be taken not to operate continuously at high levels into impedances of
less than 4 ohms.
The loudspeaker terminals will accept either bare wires or 4mm plugs. The left hand speaker has
its pair of terminals near the left hand of the rear panel (when viewing from the front of the
amplifier); the right hand speaker terminals are near the centre of the rear panel. The spacing of
the terminals is 19mm (0.75 inch) to accept standard twin speaker plugs.
One side of your speaker (normally the -side) should be connected to the black terminal; the
other (the +side) should be connected to the red terminal. For stereo applications it is important
to ensure that the two speakers are connected in phase (i.e. both wired the same way round to
the amplifier). Do not make any connections between the left and right loudspeaker leads
(except in "bridged mono" applications—see separate instruction sheet).
The SA150 and SA200 are unconditionally stable and suitable for use with all types of
loudspeaker leads, including the 'high definition' types. For good practical results we recommend
the use of heavy duty cables having at least 2 sq mm cross sectional area for each conductor. It is
also good practice for the two speaker leads to be of equal length and you should ensure that all
connections at both the amplifier and speaker are tight.
It is possible to use several pairs of loudspeakers in parallel with the SA150 or SA200 provided
the overall impedance does not fall below the limits described above. No speaker switching is
provided on the amplifiers as this invariably will cause some degradation of the signal, however
slight. If it is necessary to switch speakers we recommend that the main pair be wired directly to
the amplifier wherever possible and that only the 'extension' speakers be switched.
With both models it is possible to reduce the value of output fuse fitted in the amplifier in order to
provide the best protection for both the speaker and amplifier. See page 7 for full details.
Heat Sink
The heat produced by the SA150 and SA200 is dissipated into the air by the large cast heat sinks
whose fins form most of the rear panel. When the amplifier is in use these will run warm and may
become quite hot when the unit is run near full power, particularly into low impedance loads.
This is perfectly normal. However, if the fins become too hot to touch switch off the amplifier
at once and consult your dealer.
N.B. To ensure that the amplifier does not overheat it is important that the natural flow of air over
the heat sinks is not obstructed. It is also unwise to place heat sensitive items (such as L.P.
records) on top of or immediately above the amplifier.