13
Loudspeakers
Connections
Connect speakers to the terminals marked LOUDSPEAKERS
at the back of the receiver. Use multi-stranded wire as thick
as possible and make firm connections. The receiver will
deliver optimum undistorted power when the resultant
impedance of all the speakers connected to each stereo
channel is between 4 and 8 ohms. Speakers or combinations
of speakers with higher or lower impedances will give output
powers below the optimum. For load impedances below 4
ohms the output power drops rapidly (see curve).
The bottom figure shows some possible speaker
combinations for one stereo channel. Each channel has 3
outputs in parallel, A, B, and C. But only 2 of the outputs
(A+B or A+C) can be switched in at the same time. So when
calculating the resultant impedance you must take this into
account.
Polarity
Whichever combination of speakers is used it is important to
observe the polarity when speakers are in the same room. In
other words the cones must move forwards and backwards
together. If the polarity is wrong, one cone will be moving
forwards when the other is moving backwards and the result
will be a reduction in bass volume. The polarity will usually
be correct when each terminal marked with a minus sign (---)
on the rear panel of the receiver is connected to the terminal
marked COMMON (or NEGATIVE) on each respective
speaker. However, reversals of polarity can occur in the
wiring between the receiver and the speakers or even
occasionally inside the speaker cabinet and one way to be
certain is to check the bass volume (under mono conditions
with the speakers facing each other about 6 inches apart) and
reverse any wrong connections.
What type of speaker?
This receiver has been designed for use with speakers having
a wide range of phase angles i.e. electrostatic as well as
moving-coil systems. A good all-round type of loudspeaker
which is reliable in design, manufacture, and use is the totally
enclosed infinite baffle type. Tandberg produce a full range
of this type of loudspeaker. Ask your dealer for details.
Summary of Contents for TR-2075
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