Meridian M420 - Manual

Background

In-wall loudspeakers are not a new invention.
Indeed they have been employed for many years
by installers who wish to provide an unobtrusive
audio solution to customers who have been
unwilling or unable to install conventional free-
standing loudspeakers.

However, the design restraints generally imposed
on an in-wall design – limited space and thus
limited enclosure volume, physical limitations on
materials and other restrictions – have meant
that in-walls have traditionally offered a level of
quality and performance that has lagged some
distance behind their free-standing counterparts.

Meridian’s DSP420 breaks that mould with
an in-wall loudspeaker that is a cut above the
rest. Inside each unit, Meridian’s unique high
technology digital signal processing is used to
free the sound from the walls: the result is clear
and open with a wide response, very much in
line with the performance of Meridian’s smaller
free-standing DSP-based loudspeaker models,

and with a similar character, enabling in-wall and
free-standing speakers to be combined in a single
system as required.

As a result, the DSP420 has become one of
Meridian’s most popular loudspeakers. Following
its success, and in response to customer
demand, an active analogue variant, the M420,
is now available, with the same bass drivers
and power amplifiers as the DSP version. In
addition, the back-box available for both units
has been redesigned to permit easier and quicker
installation, including BNC connectors on the
digital version and XLRs on the analogue.

Truly Active In-Walls

The DSP420 and M420 are truly active in-wall
speakers with separate internal amplification
for high and low frequency bands. Rated
at 65 and 85 Watts respectively and using
carefully selected bipolar output devices, the
idealised low feedback designs are based on
those used in other Meridian loudspeakers to
deliver exceptionally fast bass response and

DSP420

Digital Signal Processing
In-Wall Loudspeaker System

M420

Analogue Active In-Wall
Loudspeaker System

INSTALLATION & OPERATION

The world’s first DSP In-wall
based on technology used
in Meridian’s famous DSP
speakers

New analogue active version
also available

Easy-install sealed pre-
construction enclosure with
redesigned, simplified back-
box

Double sealed and damped
acoustic enclosure

Separate, on-board,
85W bass and 65W treble
power amplifiers

2 way active speaker with
DSP (DSP420) or analogue
line-level (M420) crossover

Custom paintable grille/
frame

The DSP420 accepts up to 96kHz/
24-bit inputs including Meridian
MHR Smart Link. The M420
accepts line-level balanced
analogue inputs. Unit is
designed to comply fully
with international building
regulations