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Introduction
3
and in turn 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 speaker 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 speakers 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 torroidal 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. These incorporate a cast alloy chassis and a carbon
fibre cone, and 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 speakers 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.