Genelec AutoCal 8250A Manuel utilisateur

dsp

Operating Manual

8240A and 8250A DSP Loudspeakers

INTRODUCTION

Congratulations and a thank-you for the purchase of this Genelec 8200 Series DSP Loudspeaker. These

systems are designed to integrate easily into the digital production environment. There are several ways

to configure and operate the DSP loudspeakers for a wide variety of high quality audio applications. The

loudspeakers also have analog inputs, making them versatile and intelligent replacements for analog

loudspeakers.

This manual addresses setting up and using the 8240A and 8250A DSP loudspeakers in stand-alone

mode without the Genelec Loudspeaker Manager GLM™ and the proprietary Genelec loudspeaker

control network. Use with the GLM™ is described in the DSP System Operating Manual.

EC Declaration Of Conformity

This is to certify that Genelec 8240A and 8250A DSP loudspeakers conform to the following standards:

Safety: EN 60065: 2002 / IEC 60065:2001 7th Edition

EMC: EN 55020 : 2002 + A1 : 2003, EN 55013: (2001), EN 61000-3-2 (2000) and EN 61000-3-3 (1995)

The products herewith comply with the requirements of The Low Voltage Directive 73/23/EEC, EMC

Directive 89/336/EEC and 93/68/EEC

Signed:

Ilpo Martikainen

Position: Chairman of the Board

Date: 20-February-2006

Compliance to FCC Rules

This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions:

• This device may not cause harmful interference, and

• This device must accept any interference received, including interference that may cause

undesired operation.

Note: This equipment has been tested and found to comply with the limits for a Class B digital device,

pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against

harmful interference in a residential installation. This equipment generates, uses and can radiate radio

frequency energy and, if not installed and used in accordance with the instructions, may cause harmful

interference to radio communications. However, there is no guarantee that interference will not occur in a

particular installation. If this equipment does cause harmful interference to radio or television reception,

which can be determined by turning the equipment off and on, the user is encouraged to try to correct the

interference by one or more of the following measures:

• Reorient or relocate the receiving antenna.

• Increase the separation between the equipment and receiver.

• Connect the equipment into an outlet on a circuit different from that to which the receiver is

connected.

• Consult the dealer or an experienced radio/TV technician for help.

Modifications not expressly approved by the manufacturer could void the user’s authority to operate the

equipment under FCC rules.

SYSTEM

Genelec 8240A and 8250A DSP Loudspeakers are designed for precise monitoring of 24 bit/192

kHz AES/EBU digital audio signal or line level analog audio signal. They are fully compatible with

Genelec Loudspeaker Manager GLM™ and the proprietary Genelec loudspeaker control network, and

Genelec 7260A, 7270A and 7271A DSP Active

Subwoofers, but can also be used independently of

these. The 8240A and 8250A feature high SPL output, low colouration and broad bandwidth in a small

enclosure size. They are suitable for a wide variety of tasks, such as near field monitoring, mobile vans,

broadcast and TV control rooms, surround sound systems and home studios. The Minimum Diffraction

Enclosure™ (MDE™) and advanced Directivity Control Waveguide™ (DCW™) technologies provide

excellent frequency balance even in difficult acoustic environments.

Drivers

The bass driver dimensions are 165 mm (6 1/2”) and 205 mm (8") for 8240A and 8250A respectively. The

long, flow optimized reflex tube has a large cross sectional area and terminates with a wide flare at the

back of the enclosure. The high frequency driver is a 19 mm (3/4”) metal dome on the 8240A and a 25

mm (1") metal dome on the 8250A. All drivers are magnetically shielded.

Amplifiers

The amplifier unit is mounted in the rear of the loudspeaker enclosure. The unit incorporates special

circuitry for driver thermal overload protection. Variable input sensitivity allows accurate level matching to

console output section.

USING THE 8240A AND 8250A IN STAND-ALONE MODE

The 8240A and 8250A accept both analogue line level input signals and AES/EBU formatted digital input

signals.

When the 8240A and 8250A are not connected to Genelec loudspeaker control network, they operate

in the stand-alone mode. However, settings made with the Genelec Loudspeaker Manager software can

be saved into each loudspeaker and applied even when the network is disconnected by setting

switch 1

“STORED/MANUAL CONTROL” on switch group 2 of each loudspeaker to position “STORED.”

This manual concentrates on using the 8240A and 8250A without the control network. All issues concerning

use with the network are explained in detail in the System Operating Manual provided with the GLM™

Loudspeaker Manager software kit.

Connections

Each loudspeaker is supplied with a mains cable, one 5 m GLM network cable and an operating manual.

Before connecting up, ensure that the mains switch is off.

“MAINS INPUT” connector

Connect the mains supply to this connector.

“DIGITAL IN AES/EBU” connector

Use this female XLR connector for AES/EBU formatted digital audio input signals. This input is selected

automatically when a valid digital audio signal is present, and overrides the analogue input.

Depending on the digital hardware, transmission of a 192 kHz sample rate is achieved using a double

speed, single channel/cable interface. This is called dual-wire mode. In this case one cable per channel is

used and no channel selection is required. Dual-wire mode is automatically detected by the input stage.

If the digital source device has a digital level monitor pot or graphical volume fader that controls the

digital level, it may be advantageous to lower the level control either on the computer interface or the

loudspeaker’s back panel controls, which in turn will force the use of more of the digital [bit] resolution in

the volume control.

If the digital inputs are used, all audio outputs are referenced to 0 dBFS (digital Full Scale, the largest

level that may be represented in the AES/EBU signal). Genelec DSP loudspeakers produce 100 dB SPL

at 1 meter in free space for a digital input signal of –30 dB FS. It is advantageous to keep the digital level

as high as possible.

“DIGITAL THRU AES/EBU” connector

This male XLR carries an unaltered copy of the digital signal fed into the “DIGITAL IN AES/EBU” connector.

It can be used for daisy-chaining up to four loudspeakers together.

“ANALOG IN” connector

Use this connector for analog audio signals. When operating an 8200 Digital system in the analog mode

the A/D converter must not be overloaded, otherwise distortion will be heard. The maximum analog input

level is +18.5 dBu peak.

If the “Level” control on the 8200 back panel is reduced (turned counter-clockwise), the acoustic output will

be reduced. This control decreases the output from the D/A converters. Ideally the Level control should

be set to force the use of more of the input range of the A/D converter without overloading it. Remember,

there is no headroom above the maximum input to the A/D conversion. Once the analog signal reaches

+18.5 dBu, it attains the value “digital 1” or 0 dBFS.

“CONTROL NETWORK” connectors

Use these RJ-45 sockets to connect the loudspeaker to the proprietary Genelec Loudspeaker Manager™

(GLM™) network only. This connector is not Ethernet LAN compatible. Do not connect to Ethernet LAN.

Front panel warning light

Normally the light on the front panel of an 8200 loudspeaker is green, indicating that the loudspeaker is

in normal operational mode.

The overload light (red) is activated by several events,

• exceeding the maximum input range of the analog input

• exceeding the maximum input range of the digital input with large probability

• exceeding the output capacity of the power amplifier (clipping in the power amplifier) and thermal

overload of the power amplifier or loudspeaker drivers (thermal protection has activated)

• if an error is detected in the AES/EBU audio data

If a red warning light appears, turn the analog source down! If the levels are already modest and a digital

signal is being used, ensure that there are no bit errors in the AES/EBU digital audio data.

MOUNTING CONSIDERATIONS

Align the loudspeakers correctly

Always place the loudspeakers so that their acoustic axes are aimed towards

the listening position. Vertical placement is preferable, as it minimises acoustical

cancellation problems around the crossover frequency.

Maintain symmetry

Check that the loudspeakers are placed symmetrically and at an equal distance

from the listening position. If possible, place the system so that the listening

position is on the centerline of the room and the loudspeakers are placed at an

equal distance from the centerline.

Minimise reflections

Acoustic reflections from objects close to the loudspeakers like desks, cabinets, computer monitors etc.

can cause unwanted colouration and blurring of the sound image. These can be minimised by placing

the loudspeaker clear of reflective surfaces. For instance, putting the loudspeakers on stands behind and

above the mixing console usually gives a better result than placing them on the meter bridge. Symmetrical

positioning of the reflective objects is also importent in order to maintain a balanced soundstage.

Minimum clearances

Sufficient cooling for the amplifier and functioning of the reflex port must be ensured if the loudspeaker is

installed in a restricted space such as a cabinet, or integrated into a wall structure. The surroundings of

the loudspeaker must always be open to the listening room with a minimum clearance of 5 centimeters

(2") behind, above and on both sides of the loudspeaker. The space adjacent to the amplifier must either

be ventilated or sufficiently large to dissipate heat so that the ambient temperature does not rise above

35 degrees Celsius (95°F).

Mounting options

The vibration insulating Isolation Positioner/Decoupler™ (Iso-Pod™) table stand allows tilting of the

loudspeaker for correct alignment of the acoustic axis. The stand can be attached to three mounting

points allowing vertical and symmetrical horizontal positioning.

Genelec 8240A and 8250A can be fitted to König & Meyer loudspeaker mounts on two sets of M6x10

mm threaded holes on the back of the enclosure. On the base of the enclosure is an M10x10 mm

threaded hole which can be used for securing the loudspeaker to its base. Do not use this thread for

mounting the loudspeaker on a microphone stand which has a 3/8" UNC thread. A wide variety of

ceiling and wall mounts is available through your Genelec dealer.

Setting the input sensitivity

The loudspeaker level sensitivity functions for both analog and digital input. The sensitivity can be matched

by adjusting the rotary Level control together with the System Level switches located in the switch group

2. (switches 6 and 7). The switches provide attenuation levels of -10 dB (sw. 6 ON), -20 dB (sw. 7 ON)

and -30 dB (both switches ON) The combined attenuation ranges from 0 to -42 dB.

Functions on switch group 1 (Tone controls)

Switch group 1 (the upper switch group) comprises the tone controls that can be used to adjust the

frequency response of the system in stand-alone mode to match the acoustic environment. The

controls are labelled "TREBLE TILT", "BASS TILT", "BASS ROLL-OFF" and “DESKTOP”. The factory

settings for these controls are all "OFF" to give a flat anechoic response. Note that these controls have

no effect when switch 1 “STORED/MANUAL CONTROL” on switch group 2 is set to “STORED” or

when the loudspeaker is connected to the

Genelec loudspeaker control network.

Bass Roll-Off control

Bass Roll-Off control (switches 1 and 2) affects the low frequency roll-off of the loudspeaker and attenuates

its output near the cut-off frequency. Attenuation levels of -2 dB (sw. 1 ON), -4 dB (sw. 2 ON) or -6 dB

(both switches ON) can be selected.

Bass Tilt control

The Bass Tilt control switches (swiches 3 and 4) offer three attenuation levels for the bass response below

800 Hz, usually necessary when the loudspeakers are placed near room boundaries. The attenuation levels

are -2 dB, -4 dB and -6 dB.

Desktop low frequency control

The desktop low frequency control (switch 5) attenuates the bass frequencies around 160 Hz by 4 dB.

This feature is designed to compensate for the boost often occurring at this frequency range when the

loudspeaker is placed upon a meter bridge, table or similar reflective surface.

Treble Tilt control

Treble Tilt control (switches 6 and 7) allows adjusting the treble response above 5 kHz by +2 dB, -2 dB or

-4 dB, which can be used for correcting an excessively bright or dull sounding system or to compensate

for high frequency level loss if the loudspeaker is placed behind a screen.

An acoustic measuring system such as MLSSA or WinMLS is recommended for analyzing the effects of

the adjustments, however, careful listening with suitable test recordings can also lead to good results if a

test system is not available. The table below shows some typical settings in various situations.

Always start adjustment by setting all switches to "OFF” position. Measure or listen systematically through

the different combinations of settings to find the best frequency balance. See table below for some typical

settings in various situations. Please note that the GLM Loudspeaker Controller allows a much more

versatile and precise set of controls to be used, and supports the fully automatic system alignment feature,

the Genelec AutoCal.

Loudspeaker Mounting Position Treble Tilt Bass Tilt Bass Roll-Off Desktop

Flat anechoic response None None None None

Free standing in a damped room None -2 dB None None

Free standing in a reverberant

room None -4 dB None None

Near field on a reflective surface None -2 dB None -4 dB

In a corner None -4 dB -4 dB None

Functions on Switch Group 2

Stored / Manual Ctrl

This allows the selection between two basic methods of controlling the loudspeaker in the stand-alone

mode. “MANUAL CTRL” refers to controlling the loudspeaker using the controls on the loudspeaker’s

back panel. The “STORED” refers to using settings stored inside the memory of the loudspeaker. These

settings are made using the GLM and the GLM Control Network. There is additional functionality compared

to that offered by the room response correction switches on the back panel. Note that setting the selector

to “STORED” overrides all back panel switches except “DRIVER MUTE”. These switches only have effect

when the selector is set to “MANUAL CTRL”.

AES/EBU CH

This selects the audio channel(s) available on the AES/EBU cable to be reproduced by the loudspeaker.

Turning both switches on reproduces the sum of the two channels on the AES/EBU cable. Turning both

switches off has the same effect which has been done deliberately to avoid the situation where no input

channel is selected and the loudspeaker is effectively muted. When two channels are selected, 6 dB of

attenuation is automatically applied to avoid overloading the loudspeaker.

If the AES/EBU cable is operated in dual-wire mode (typically 192 kHz sampling frequency) one AES/

EBU cable carries only one audio channel. The loudspeaker detects this situation automatically and the

channel selection switches have no effect.

Driver Mute

These two switches allow you to mute the treble driver (marking TW) and bass driver (marking WF)

independently. This may be useful to diagnose if a transducer is faulty.

System Lvl

These switches allow scaling down of the loudspeaker output. The signal sent to the “Thru” output

connector is not affected. The switches are additive, for example, “–30 dB” attenuation is achieved by

turning on the “–10 dB” and “–20 dB” switches. The effect of these switches is combined with the effect of

the rotary level adjustment control. This results in total possible attenuation of 42 dB, 30 dB by the system

level switches and another 12 dB by the rotary control.

Using 7000 Series Analog Subwoofers with 8200 Series DSP Loudspeakers

Please follow the steps below to integrate an analog subwoofer into a system of DSP loudspeakers:

• Connect cables carrying analog audio to the 7000 Series analogue subwoofer first.

•

Connect the subwoofer outputs to the analog inputs of the 8200 Series DSP main loudspeakers.

Ce manuel convient aux modèles suivants

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