Tannoy TURNBURRY 85 LE, Owner'S Manual

Page: 7 / 16

7
Crossover network
During the design of the crossover network the acoustic, mechanical and electrical interactions of the high and low frequency sections
have been fully analysed. The crossover is therefore an integral part of the design of the system. The crossover network provides
complex equalisation in both amplitude and phase for each section and fully integrates the response at the crossover point. All components
are high precision, low-loss and thermally stable. Specially selected components of the highest quality are used, such as ClarityCap™
non-microphonic polypropylene capacitors and very low loss laminated iron core inductors. Wiring is by Oyaide™ PCOCC-A
(99.9999% purity), having a large crystal structure and stable atomic arrangement.
All components in the crossover network are hard wired to eliminate unwanted metal-to-metal contact and ensure freedom from vibration.
The components are laid out to minimise inter component coupling and are placed well away from the driver magnetic field. High current
switch blocks with gold-plated screw terminals permit user adjustment of high frequency energy to suit differing listening environments.
The complementary design of crossover and drive units means that the loudspeaker system as a whole behaves as a minimum phase
system over the audio band and therefore the acoustic sources of the high and low frequency sections are aligned in time and space
to ensure accurate reproduction of stereo images.
Cable choice
Always use the best quality of cable available within your budget. High quality audio signals passing from the amplifier to the loudspeaker
are unusual in their demands on the cable. Wide dynamic range and wide bandwidth information has to coexist with the ability to transmit
peak currents of at least 10 amps, without incurring any loss or signal impairment. This explains why the sound quality of the information
reproduced by the loudspeakers is so dependant on the physical properties of the cables connecting them to the amplifier.
We would recommend that you always keep the cable runs the same length for each speaker. Remember, cable construction
can affect the sound quality so be prepared to experiment to find a cable that suits your ear and audio system.
Connection of earth or ground lead
(See figs. 1, 2, 3 and 4)
The drive unit chassis has an earth connection, which is ideally used with a screened loudspeaker cable for connection to the chassis.
This prevents the driver and cable acting as an antenna, and returning radio signals to the amplifier, causing interference with the audio
signal and impairing resolution.
In order to take advantage of the driver earthing feature within the Turnberry 85LE and to optimise performance further, use a shielded
or screened loudspeaker cable. The screening termination should be connected to the earth or ’ground’ (green) terminal on the
loudspeaker and to the ground or earth connection on the amplifier. Alternatively if you are not using a screened loudspeaker cable but
wish to utilise the earthing facility, run a single cable between the earth or ’ground’ (green) terminal on the loudspeaker to the earth
(ground) connection or chassis on the amplifier.