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user manual
TCS Compact series
tcs compact manual
page 19
Crossovers and Processors
In order to correctly set up your sound system a selection of audio processing devices are
necessary to divide the frequencies between the speakers, apply equalisation and limit
the dynamic headroom. These duties can be performed by proprietary units such as
standalone crossovers, graphic equalisers and limiters, and a TCS Compact series
installation can be built in this way by paying careful attention to details such as
appropriate crossover settings. This information is provided in the Technical
Specifications for each TCS Compact series speaker.
Active and Passive systems
Passive crossover networks split the frequency range between drivers after the amplifier.
Although this an economical method for many general purpose applications, problems
associated with this approach include the loss of energy (watts) as heat in the
components of the crossover. Also, it is not possible to design steep roll-offs, as a broad
range of frequencies has to be covered by both components. This causes smearing
between the drivers and potentially raises the distortion from the individual components.
If the headroom limit of the amplifier is reached the HF component can be heard
‘pumping’
,
as large amounts of energy are consumed by the low frequency transients.
In an active system the crossover is placed before the amplifiers to gain particular
advantages. More amplifier channels are needed to deal with the split of frequency bands
but this separation also helps to deliver a cleaner, more controlled sound from the
speakers. The HF cannot be modulated by power drains needed by the LF speakers.
Loudspeaker Management Systems
The concept of a Loudspeaker Management System is to provide all the processing
electronics you might need in one box. This typically includes crossover functions,
equalisation, limiters, delays and preset memories, that can store different set ups for
various applications. A loudspeaker management system offers potentially better audio
quality, more precise control and protection against unwanted changes in settings.
Digital processing enables steeper roll-offs through the crossover areas to be designed,
allowing more output from the speakers, as they are individually handling more
appropriate bandwidths. Also, the addition of delay to the LF signal to match the arrival
of the HF can help to make the image more intelligible. Therefore, it is much easier, and
more efficient, to manipulate audio digitally in low voltage electronics than in the passive
crossover networks found inside speakers.
The TCS Compact series has a range of sub bass units (TCS-115C, TCS-118C, TCS-215C,
TCS-218C) that are designed to be used actively with the mid/top cabinets (TCS-081C,
TCS-101C, TCS-121C, TCS-151C). The Turbosound LMS-D24 and LMS-D26 loudspeaker
management systems contain custom presets for the TCS Compact series along with a
world-class audio specification.