Genelec 8020A Manuel utilisateur

Genelec 8020A

Active Monitoring System

Operating Manual

8020A

General description

The bi-amplified GENELEC 8020A is an ex-

tremely compact two way active monitoring

loudspeaker designed for near field monitoring,

mobile vans, broadcast and TV control rooms,

surround sound systems, home studios, multi-

media applications and also for use with com-

puter soundcards. As an active loudspeaker, it

contains drivers, power amplifiers, active cross-

over filters and protection circuitry. The MDE™

(Minimum Diffraction Enclosure™) loudspeaker

enclosure is made of die-cast aluminium and

shaped to reduce edge diffraction. Combined

with the advanced Directivity Control Wavegui-

(DCW

), this design provides excellent

frequency balance in difficult acoustic environ-

ments. If necessary, the bass response of the

8020A’s can be extended with a Genelec 7050B

subwoofer.

Positioning the loudspeaker

Each 8020A monitor is supplied with an inte-

grated amplifier unit, mains cable and an oper-

ating manual. After unpacking, place the loud-

speaker in its required listening position, taking

note of the line of the acoustic axis. The axes of

all loudspeakers should converge at ear height

at the listening position (see Figure 1).

Connections

Before connecting up, ensure that the volume

control potentiometer on the front panel is turned

fully counter-clockwise to the stand-by setting.

Connect the loudspeaker to an earthed mains

connection with the supplied mains cable. Never

connect the loudspeaker to an unearthed mains

supply or using an unearthed mains cable.

Audio input is via a 10 kOhm balanced fe-

male XLR connector labelled “INPUT”. An un-

balanced source may be used as long as pin 3

is grounded to pin 1 at the unbalanced source

connector (see Figure 2).

The male XLR “OUTPUT” connector can

be used for daisy-chaining up to six 8020A’s

together or for connecting a Genelec 7050B

or 7050A subwoofer. The volume control at-

tenuates the signal on this output, so the first

“master” loudspeaker on a daisy chain can be

used to adjust the level on the whole chain. The

volume controls on the “slave” loudspeakers

should be set fully clockwise.

Once the connections have been made, the

loudspeakers are ready to be switched on.

Volume control and stand-by

switching

The input sensitivity of the loudspeakers can be

matched to the output of the mixing console or

other source by adjusting the volume control on

the front panel. When the volume control knob

is turned fully counter-clockwise, the 8020A

goes into stand-by mode. The loudspeaker

can be left in stand-by mode whenever it is not

used, however, it is only completely disconnect-

ed from the mains power when the mains cable

is disconnected.

Setting the tone controls

The frequency response of the Genelec

8020A can be adjusted to match the acous-

tic environment by setting the tone control

switches on the rear panel. The controls are

“Treble Tilt”, “Bass Tilt” and “Bass Roll-Off”. An

acoustic measuring system such as WinMLS

or comparable is recommended for analyzing

the effects of the adjustments, however, care-

ful listening with suitable test recordings can

Figure 1:

Location of the acoustic

axis

Figure 2:

Type of cable needed

if unbalanced source is used

(example shown is RCA output to

the XLR input)

Figure 3:

Control and connector layout on the rear panel

of an 8020A.

also lead to good results if a test system is

not available. Table 1 above shows some ex-

amples of typical settings in various situations.

Figure 4 shows the effect of the controls on

the anechoic response.

Treble Tilt

Treble Tilt control (switch 1) attenuates the

treble response of the loudspeaker at frequen-

cies above 5 kHz by 2 dB, which can be used

for smoothening down an excessively bright

sounding system.

Bass Tilt

Bass Tilt control offers three attenuation levels

for the bass response of the loudspeaker below

2 kHz, usually necessary when the loudspeak-

ers are placed near a wall or other room bound-

aries. The attenuation levels are -2 dB (switch

3 “ON”), -4 dB (switch 4 “ON”) and -6 dB (both

switches “ON”).

Bass Roll-Off

Bass Roll-Off (switch 2) activates high-pass

filtering at 85 Hz to complement the low-pass

filters of a Genelec 7050B or 7050A subwoofer.

This switch should always be set to “ON” when

using the 8020A with these subwoofers.

The factory setting for all tone controls is “OFF”

to give a flat anechoic response. Always start

adjustment by setting all switches to “OFF” po-

sition. Measure or listen systematically through

the different combinations of settings to find the

best frequency balance.

Mounting considerations

Align the loudspeakers correctly

Always place the loudspeakers so that their

acoustic axes (see figure 1) are aimed towards

the listening position. Only vertical placement is

preferred, as it minimises acoustical cancella-

tion problems around the crossover frequency.

Maintain symmetry

Check that the loudspeakers are placed sym-

metrically and at an equal distance from the

listening position. If possible, place the system

so that the listening position is on the center-

line 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 coloura-

tion blurring of the sound image. These can be

Table 1:

Suggested tone control settings for differing acoustical environments

Speaker Mounting Position

Treble Tilt

Bass Tilt

Bass Roll-Off

Flat anechoic response

OFF

Free standing in a damped room

OFF

Free standing in a reverberant room

OFF

-2 dB

OFF

Near field or console bridge

OFF

-4 dB

OFF

Near to a wall

OFF

-6 dB

OFF

With a 7050B subwoofer

See above

minimised by placing the loudspeaker clear of

reflective surfaces. For instance, putting the

loudspeakers on stands behind and above the

mixing console and tilting them down to point

the acoustic axes to ear level at the listening

position usually gives a better result than plac-

ing the loudspeakers on the meter bridge.

Minimum clearances

Sufficient cooling for the amplifier and function-

ing 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 loud-

speaker. 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 8020A offers several mounting options:

The Iso-Pod™ (Isolation Positioner/Decou-

pler™) vibration insulating table stand allows

tilting the loudspeaker for correct alignment

of the acoustic axis. On the base of the loud-

speaker is a 3/8” UNC threaded hole compat-

ible with a standard microphone stand. On the

rear there are two M6x10 mm threaded holes

for Omnimount

size 20.5 brackets or the key-

hole wall mount adapter provided with the loud-

speaker.

Maintenance

No user serviceable parts are to be found within

the amplifier unit. Any maintenance or repair of

the 8020A unit should only be undertaken by

qualified service personnel.

Safety considerations

Although the 8020A has been designed in ac-

cordance with international safety standards,

the following warnings and cautions should

be observed to ensure safe operation and to

maintain the loudspeaker under safe operating

conditions:

• Servicing and adjustment must only be

performed by qualified service personnel.

The loudspeaker must not be opened.

• Do not use this product with an unearthed

mains cable or an unearthed mains

connection as this may compromise

electrical safety.

• Do not expose the loudspeaker to water or

moisture. Do not place any objects filled with

liquid, such as vases on the loudspeaker or

near it.

• This loudspeaker is capable of producing

sound pressure levels in excess of 85 dB,

which may cause permanent hearing

damage.

• Free flow of air behind the loudspeaker is

necessary to maintain sufficient cooling.

Do not obstruct airflow around the

loudspeaker.

• Note that the amplifier is not completely

disconnected from the AC mains service

unless the mains power cord is removed

from the amplifier or the mains outlet.

Guarantee

This product is guaranteed for a period of one

year against faults in materials or workmanship.

Refer to supplier for full sales and guarantee

terms.

Figure 4. The curves above show the effect of the “Bass Tilt”, “Treble

Tilt” and “Bass Roll-Off” controls on the free field response of the

8020A

Figure 5. The upper curve group shows the horizontal directivity

characteristics of the 8020A measured at 1 m. The lower curve

shows the system's power response.

Bass amplifier output power with an 8 Ohm load: 20 W

Treble amplifier output power with an 8 Ohm load: 20 W

Long term output power is limited by driver unit

protection circuitry.

Amplifier system distortion at nominal output:

THD

0.08 %

SMPTE-IM

0.08 %

CCIF-IM

0.08 %

DIM 100

0.08 %

Signal to Noise ratio, referred to full output:

Bass

95 dB

Treble

95 dB

Mains voltage:

100, 120, 220 or 230 V

according to region

Voltage operating range: ±10 %

Power consumption: Idle 5 VA

Full output 50 VA

Lower cut-off frequency, –3 dB:

Upper cut-off frequency, –3 dB:

21 kHz

Free field frequency response of system:

66 Hz – 20 kHz (± 2.5 dB)

Maximum short term sine wave acoustic output on axis

in half space, averaged from 100 Hz to 3 kHz:

@ 1 m

96 dB SPL

@ 0.5 m

102 dB SPL

Maximum long term RMS acoustic output in same

conditions with IEC weighted noise (limited by driver

unit protection circuit): @ 1 m

95 dB SPL

Maximum peak acoustic output per pair on top of

console, @ 1 m from the engineer with music material:

105 dB

Self generated noise level in free field @ 1m on axis:

10 dB (A-weighted)

Harmonic distortion at 85 dB SPL @ 1m on axis:

Freq: 50…100 Hz < 3 %

> 100 Hz < 0.5 %

Drivers: Bass 105 mm (4") cone

Treble 19 mm (

") metal dome

Both drivers are

magnetically shielded

Weight: 3.7 kg (8.1 lb)

Dimensions: Height

242 mm (9

”)

(including Iso-Pod™ table stand)

Height

230 mm (9

”)

(without Iso-Pod™ table stand)

Width

151

(

Depth

142 mm (5

”)

Connectors:

Input: XLR female, balanced 10 kOhm,

pin 1 gnd, pin 2 +, pin 3 -

Output: XLR male, balanced 100 Ohm

Pin 1 gnd, pin 2 +, pin 3 -

Input level for 100 dB SPL output at 1 m:

-6 dBu at volume control max

Volume control range:

-80 dB relative to max output

Output signal level is 0 dB relative to input signal level

but adjustable by volume control

Crossover frequency, Bass/Treble: 3.0 kHz

Treble tilt control operating range:

0 to –2 dB @ 15 kHz

Bass roll-off control operating in a –6 dB step @ 85 Hz

(to be used in conjunction with a 7050B subwoofer)

Bass tilt control operating range in –2 dB steps:

0 to –6 dB @ 100 Hz

The ‘CAL’ position is with all tone controls set to ‘off’ and

the input sensitivity control to maximum (fully

clockwise).

AMPLIFIER SECTION

CROSSOVER SECTIONSYSTEM SPECIFICATIONS

EC Declaration of Conformity

This is to certify that the Genelec Monitoring System

8020A conforms 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)

EN 61000-3-3 (1995)

The product herewith complies with the requirements of

The Low Voltage Directive73/23/EEC, EMC Directive

89/336/EEC and 93/68/EEC

Signed:

Ilpo Martikainen

Position: Managing Director

Date: 4-May-2005

8020A Operating Manual

Genelec Document D0034R001 Copyright Genelec Oy 5.2005. All data subject to change without prior notice

www.genelec.com

International enquiries:

Genelec, Olvitie 5

FIN-74100, Iisalmi, Finland

Phone +358 17 83881

Fax +358 17 812 267

Email [email protected]

In the U.S. please contact:

Genelec, Inc., 7 Tech Circle

Natick, MA 01760, USA

Phone +1 508 652 0900

Fax +1 508 652 0909

Email [email protected]

In China please contact:

Genelec China Representative Office

Soho New Town, 88 Jianguo Road

D-1504, Chaoyang District

Beijing 100022, China

Phone +86 10 8580 2180

Fax

+86 10 8580 2181

Email [email protected]

In Sweden please contact

Genelec Sverige

Ellipsvägen 10B

P.O. Box 5521, S-141 05 Huddinge

Phone +46 8 449 5220

Fax +46 8 708 7071

Email [email protected]

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