Genelec 1238AC Operating Manual
Introduction
Congratulations and thank you for
choosing Genelec!
Since 1978, Genelec has been guided
by a single idea – to make perfect
active monitors that deliver neutral and
accurate sound in every kind of acoustical
environment. In Genelec’s quest for this
ultimate goal, our unrivalled commitment
to research and development has led us
to continuously develop innovative driver
technology, electronic circuitry, enclosure
designs and more.
Our design philosophy is based on
sustainability and environmental values,
where industrial design serves our
products' acoustical performance. Your
Genelec product has been designed and
manufactured with care in our factory, in
Finland, using environmentally efficient
solutions to give you reliable operation
over many years.
Please take the time to read this manual.
Happy monitoring!
General Description
The Genelec 1238AC is a three-way
monitoring system for medium sized control
rooms. It performs well as free-standing
monitor as well as flush-mounted in control
room walls. It is suited for recording, film
and video post-production, broadcast
monitoring as well as for mastering.
The unique Directivity Control
Waveguide™ (DCW™) technology by
Genelec provides excellent stereo imaging
and neutral frequency response even in
difficult acoustics.
With program material at a 2 meter
listening distance, the fast low distortion
amplifiers drive a stereo system to peak
sound levels in excess of 124 dB SPL.
The 1238AC is fully compatible with
Genelec Loudspeaker Manager GLM™ and
the proprietary Genelec control network.
It can be used with 8200-series SAM
monitors and 7200-series SAM subwoofers
in the same network.
Drivers and Cabinet
Construction
The 1238AC reproduces low frequencies
with dual 250 mm (10 in) woofers in a 110
litre bass reflex enclosure. The proprietary
130 mm (5 in) direct radiating midrange
driver, and a 25 mm (1 in) metal dome
tweeter are acoustically loaded by the
proprietary Directivity Control Waveguide.
All drivers are magnetically shielded.
Amplifiers and Signal
Processing
The 1238AC uses the RAM-L amplifier unit.
The RAM-L is designed to be mounted in
a 19 inch rack. Digital signal processing
in the RAM-L amplifier unit is done with
high precision algorithms, and includes
driver and amplifier overload protection.
The room response compensations
include highly flexible parametric filters,
level alignment, and acoustic delay
compensation. These allow accurate
matching to all console output sections
and room acoustics.
Cables
Each 1238A is delivered with the following
cable kit:
• One mains cable
• Two 10 m (32 ft 9 in) 4-pole Speakon
cables
• One 10 m (32 ft 9 in) RJ45 cable
• One 5 m (16 ft 4 in) RJ 45 cable
The 10 m cables are designed to go
between the amplifier and the monitor
enclosure. If you need to make custom
length cables for this, please connect the
Speakon cables pin to pin and see Table 1
for recommended wire gauges.
Operating Environment
These monitors and their RAM-L
amplifiers are designed for indoor
