Meridian DSP420 User Manual page 7

produces a convincingly 'big box' sound from an
in-wall unit. At moderate volumes, a psychoacoustically
correct filter extends the bass response much further
than can be achieved with an analogue loudspeaker
of equal size while at high volumes dynamic DSP
bass protection is used to prevent the woofers from
bottoming. As a result only the very lowest frequencies
are reduced.
Power amplifiers
The loudspeakers are driven by two high-power, low-
feedback power amplifiers using carefully selected
bipolar output devices. The amplifiers are direct coupled
to the drive units for the most efficient delivery of power
and the best possible control over driver excursion.
The power supply includes a substantial toroidal
transformer and audiophile-grade capacitors, and the
system uses careful star earthing, resulting in extremely
low levels of noise and distortion.
DSP420 drivers
Each DSP420 loudspeaker uses two parallel 127mm
(5") bass drive units which incorporate a cast alloy
chassis and carbon fibre cone. They have a very large
magnet which provides excellent drive and control.
Combined with Meridian's active bass extension
technology, they provide surprisingly rich, deep bass,
quite unprecedented for this size of cabinet.
The treble unit is a very high quality 25mm (1")
aluminium dome with a neodymium magnet and a
protective grille. It is extremely well matched to the
woofer, and also tonally very compatible with the other
loudspeakers in the Meridian range.
The DSP420 is enclosed in an acoustic back box
and front baffle constructed from aluminium, which
has low resonance at low frequencies and has been
further dampened by incorporating stiffening into the
back box. Additional high-frequency damping ensures
that the whole system suffers exceptionally little
cabinet coloration and delivers excellent mid-range
transparency. All damping materials have been fully
tested to ensure they comply with building regulations
for in-wall designs.
Meridian High Resolution (MHR)
The DSP420 In-Wall Loudspeaker System supports
Meridian High Resolution (MHR) to allow you to
connect to other MHR-compliant Meridian products to
take advantage of high-rate audio sources and provide
the additional benefits of lower jitter and improved
sound quality on all sources.
MHR is a proprietary secure encoding format that uses
encryption and anti-copy methods to provide a secure
copyright protection environment, and allow the secure
transfer of audio streams within a Meridian-only system
for playback only.
Meridian Comms
The DSP420 In-Wall Loudspeaker System is part of
the Meridian family of advanced digital, analogue, and
video components. These incorporate a sophisticated
communications link to allow you to control any
combination of units using a single remote and ensure
that they will work together as a fully integrated system.
The communications system also allows you to extend
your hi-fi system into two or three rooms with the ability
to control the sources in one room from the controller
in another room.
The following pages show two recommended
configurations based on the DSP420 In-Wall
Loudspeaker System to illustrate the flexibility of
Meridian components.
3
Introduction