Genelec 1238A Handleiding

Genelec Monitor 1238A

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Genelec 1237A and 1238A

Smart Active Monitors

Operating Manual

1237A and

1238A

Genelec 1237A and 1238A Operating Manual

Introduction

Congratulations and a thank-you for the pur-

chase of this Genelec Smart Active Monitor-

ing (SAM) Series DSP monitor loudspeaker.

This product should be set up using the

fully automatic process in the Genelec Loud-

speaker Manager GLM™ software. There are

no setup controls on the ampliﬁer panel.

This manual describes the basic setup of

the monitor for use with the GLM software, as

well as use in the Stand-alone mode without

the GLM software in use or permanently con-

nected for computer control.

Each monitor is supplied with a mains

cable, one GLM control network cable, and

an operating manual.

System

The Genelec 1237A and 1238A are three-way

monitoring systems for medium sized control

rooms. They perform well as free-standing

monitors as well as ﬂush-mounted in control

room walls. They are suited for recording, ﬁlm

and video post-production, broadcast moni-

toring as well as for mastering.

The unique Directivity Control Waveguide™

(DCW™) technology by Genelec provides

excellent stereo imaging and neutral fre-

quency response even in difﬁcult acoustics.

With program material at a 2 meter listen-

ing distance, the fast low distortion ampliﬁers

drive a stereo system to peak sound levels

in excess of 122 dB SPL (1237A) or 124 dB

SPL (1238A).

The 1237A and 1238A are fully compatible

with Genelec Loudspeaker Manager GLM™

and proprietary Genelec control network.

They can be used with 8200-series SAM

monitors and 7200-series SAM subwoofers

in the same network.

Drivers and Cabinet

Construction

The 1238A reproduces low frequencies with

a 385 mm (15 in) woofer in a 110 litre bass

reﬂex enclosure. The 1237A features a 305

mm (12 in) woofer in a 65 litre bass reﬂex

enclosure. Both monitors use the same pro-

prietary 130 mm (5 in) direct radiating mid-

range driver, and a 25 mm (1 in) metal dome

tweeter, both acoustically loaded by the pro-

prietary Directivity Control Waveguide. All

drivers are magnetically shielded.

Amplifiers and Signal

Processing

The 1237A and 1238A use the RAM-L ampli-

ﬁer unit. The RAM-L is mounted with vibration

absorbers in the rear of the monitor enclo-

sure, and can also be detached and mounted

to 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 ﬂex-

ible parametric ﬁlters, level alignment, and

acoustic delay compensation. These allow

accurate matching to all console output sec-

tions and room acoustics.

Mounting Considerations

Place monitors so that their acoustic axes are

aimed towards the listening position (see Fig-

ures 1 and 2). Place monitors with left-right

symmetry and at an equal distance from the

listening position. Acoustic reﬂections from

objects close to monitors and the listening

position can cause colouration and blurring

of the sound image. Symmetrical positioning

of reﬂective objects maintains good stereo

imaging. When sofﬁt (ﬂush) mounting, the

wall surface should extend to the monitor,

forming a continuous surface.

Minimum Clearances

The minimum clearance is 5 cm (2 in) behind,

above and on both sides of the monitor, when

the RAM-L ampliﬁer is mounted on the enclo-

sure. The ambient temperature around the

ampliﬁer must not exceed 35 degrees Cel-

sius (95°F). When sofﬁt mounting, sufﬁcient

ventilation should be a arranged behind the

monitor. This may require forced ventilation

around the RAM-L ampliﬁer.

When the RAM-L ampliﬁer is mounted

in a 19 in rack, the minimum free space

is 1U both above and below the ampliﬁer

and both sides of the ampliﬁer fully open

to enable free movement of air. Use the

included rack mount front plate to ensure

sufficient space above and below the

ampliﬁer.

When the RAM-L is mounted on a table,

shelf or similar solid surface, there must be a

free space of at least 250 mm (10 in) above

and 10 cm (4 in) on both sides of the ampli-

ﬁer. Free air ﬂow must be possible in the front

side of the ampliﬁer.

Set-up and Use

Monitor calibration and setup

The 1237A and 1238A are set up using the

GLM software. The setup is fast and consists

of the following steps:

1. Run a CAT5 (RJ45) cable from the mon-

itor control network to the next monitor.

2. Run the ﬁnal cable to control network

input of the GLM Adapter device.

3. Connect the GLM Adapter device to

your computer USB connector. The

cable

is a part of the GLM User Kit

4. Place the Genelec measurement micro-

phone at the listening location of the engi-

neer, on a stand, with the microphone

pointing upwards and the microphone

top at the height of the engineers ear in

normal working position. The microphone

is a part of the GLM User Kit.

5. Run the microphone cable to the micro-

phone input in the GLM Adapter device.

6. Download GLM software at the Genelec

web site (www.genelec.com). Install the

GLM software.

7. Follow the GLM software instructions to

measure and set up your monitors.

8. If you plan to not use a computer for

controlling the monitors, use the GLM

software to write the setting into the

monitors ("Store the Settings").

Recommendations for

AES/EBU Audio

For a digital input signal of –30 dB FS, the

1237A and 1238A monitors will produce a

100 dB sound level (SPL) at 1 meter distance,

in free space. The sensitivity of the monitor

system is set using the GLM software.

It is advantageous to keep the maximum

incoming digital audio signal level high, near

to 0 dBFS. It may be useful to lower the inter-

nal GLM level control. This enables maintain-

ing high digital resolution in the digital source.

Single-wire mode of AES/EBU is the

default and the older dual-wire mode is auto-

matically detected if used at the source.

The standard AES/EBU cable carries two

channels of audio, called A and B. As a default,

“DIGITAL THRU AES/EBU” Connector

This output carries an unaltered copy of

the digital audio signal and can be used for

daisy-chaining the signal up to three addi-

tional SAM monitors or subwoofers.

“ANALOG IN” Connector

The maximum input level of the analog input

is +25.0 dBu. The analog input must not be

overloaded, otherwise distortion will result.

When the maximum input is exceeded, the

enclosure front panel light turns red, indicat-

ing the overload.

The sensitivity of the monitor system is

set using the GLM software. Coming from

the factory, the analog input is set to the

highest sensitivity, resulting in a sound

output of 100 dB SPL for a -6 dBu analog

input signal.

“CONTROL NETWORK” Connectors

The RJ-45 sockets connect the monitor to

the proprietary Genelec Loudspeaker Man-

ager™ (GLM™) network. Do not connect to

Ethernet LAN.

“Loudspeaker Connectors” Group

These connectors are used when the RAM-L

ampliﬁer is mounted separately in an equip-

ment rack.

1. “LED” Connector

This RJ-45 socket is a connection for

the front panel warning LED.

2. “Woofer” Connector

A standard four-pole Speakon cable

connects to the woofer.

3. M i d r a n g e / Tw e e t e r ” C o n n e c t o r

Figure 3. GLM network cabling

LISTENING

POSITION

MICROPHONE

GLM

NETWORK

GLM

NETWORK

GLM

NETWORK

USB

Figure 1. The location of the acoustic axis.

H1 mm (in) W1 mm (in) H2 mm (in) W2 mm (in)

1237A 540 (21 1/4 in) 200 (7 7/8 in) 230 (9 1/16 in) 170 (6 11/16 in)

1238A 650 (25 5/8 in) 240 (9 1/2 in) 282 (11 1/8 in) 202 (7 15 /16 in)

both A and B subchannels are reproduced by

the monitor. GLM software is used to set up

the monitor to speciﬁc channel assignments.

RAM-L Amplifier

Power Button

The power button in the middle of the RAM-L

ampliﬁer front panel controls several functions.

A short press of the power button turns

RAM-L on or off. Turning on, the power button

light ﬂashes rapidly, and lights on steadily

when the turn-on has been completed.

Testing modes are explained later in this

manual.

Setting ISS™

The Intelligent Signal Sensing (ISS) puts the

monitor to a power-saving stand-by mode

automatically. The factory setting for ISS is

"OFF." The ISS can be activated using the

GLM software (see Figure 5). When ISS is

active, if no audio signal is sensed during

the selected time, the monitor powers down.

The monitor will power up again once a

signal is detected. The ISS setting is applied

to all ISS-enabled monitors in the currently

selected Setup.

Connections

“MAINS INPUT” Connector

Connect to the mains supply.

“DIGITAL IN AES/EBU” Connector

The monitor defaults to reproducing an

analog input signal. The digital audio AES/

EBU input is selected automatically when a

valid digital audio signal is presented. Use

GLM software to deﬁne the AES/EBU sub-

frame to monitor.

100 120

0 - 0

Figure 2. Recommended placement and

alignment of monitors in a 5-channel

system (ITU-R BS.775-1)

Product specificaties

Merk:	Genelec
Categorie:	Monitor
Model:	1238A

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