GENELEC 4020C Extremely Compact Two Way Active Loudspeaker Instruction Manual

GENELEC 4020C Extremely Compact Two Way Active Loudspeaker

General
The bi-amplified Genelec 4020C is an extremely compact two way active loudspeaker designed for fixed installations. As an active loudspeaker, it con-tains drivers, power amplifiers, active crossover fil-ters and protection circuitry. The 4020C is designed for indoor use only, in temperatures between 15 to 35 degrees Celsius and relative humidity between 20 % and 90 %.
The MDE™ (Minimum Diffraction Enclosure™) loudspeaker enclosure is made of die-cast alumin-ium and shaped to reduce edge diffraction. Com-bined with the advanced Directivity Control Wave-guideTM (DCWTM), this design provides excellent fre-quency balance in difficult acoustic environments.

Positioning the loudspeaker

Each 4020C is supplied with an integrated ampli-fier unit, mains cable, a 3-pin balanced Euroblock connector for audio signal, a keyhole type wall-mount and an operating manual. After unpacking, place the loudspeaker in its required listening posi-tion, taking note of the line of the acoustic axis. The axis should be pointed towards the center of the listening area.

Connections

Before connecting up, ensure that the loudspeakers and the signal source have been switched off. The power switch of the 4020C is located on the back panel (see Figure 3). Connect the loudspeaker to an earthed mains connection with the supplied mains cable. Never connect the loudspeaker to an un-earthed mains supply or using an unearthed mains cable. Audio input is via a 10 kOhm balanced connector. The pin sequence of the connector is shown in Figure 2.

Connect the signal cable to the 3-pole plug pro-vided with the loudspeaker and secure the con-nections by tightening the screws on each pole. Push the plug into the connector on the loud-speaker.
If you want to daisy-chain multiple loudspeak-ers, simply connect a second signal cable to the plug and use it to route the signal to the next loud- speaker (see Figure 4).
Never connect the 4020C to the loudspeaker outputs of a power amplifier or an integrated am-plifier or receiver.
Once the connections have been made, the loudspeakers are ready to be switched on.

ISSTM Autostart
The automatic power saving function ISS (Intelli-gent Signal Sensing) can be activated by setting the “ISS” switch on the back panel to “ON.” Auto-matic powering down to standby mode happens after a certain time when playback has ended. The power consumption in standby mode is typically less than 0.5 watts. Playback will automatically resume once an input signal is detected from the source.
There is a slight delay in the automatic pow-ering up. If this is undesirable, the ISSTM function can be disabled by setting the “ISS” switch on the back panel to “OFF.” In this mode, the loudspeak-er is powered on and off using the power switch on the back panel.

Level control
The input sensitivity of the loudspeaker can be matched to the output of the signal source by ad-justing the level control on the rear panel.

Setting the tone controls
The frequency response of the Genelec 4020C can be adjusted to match the acoustic environ-ment 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 recom-mended for analyzing the effects of the adjust-ments, however, careful listening with suitable test recordings can also lead to good results if a test system is not available. Table 1 shows some examples of typical settings in various situations.

Figure 5 shows the effect of the controls on the anechoic response.

Treble Tilt
The Treble Tilt control (switch 2) boosts the treble response of the loudspeaker at frequencies above 4 kHz by +2 dB, which can be used for compensat-ing for the high frequency loss occurring at long listening distance, off-axis listening or when the loudspeaker is placed behind a screen or decora-tive cloth.

Bass Tilt
The Bass Tilt control offers three attenuation levels for the bass response of the loudspeaker below 2 kHz, usually necessary when the loudspeakers are placed near a wall or other room boundaries.

Table 1: Suggested tone control settings for differing acoustical environments

The attenuation levels are -2 dB (switch 4 “ON”), -4 dB (switch 5 “ON”) and -6 dB (both switches “ON”).

Bass Roll-Off
Bass Roll-Off (switch 3) activates a -4 dB filter to the lowest bass frequencies (65 Hz). This can be used for compensating excessively heavy bass re-production typically caused by loudspeaker place-ment near room boundaries.
The factory setting for all tone controls is “OFF” to give a flat anechoic response. Always start ad-justment by setting all switches to “OFF” position. Measure or listen systematically through the dif-ferent 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 center of the listening area. Only vertical placement is preferred, as it minimises acoustical cancellation problems around the crossover frequency.

Minimise reflections
Acoustic reflections from objects close to the loudspeakers like walls, cabinets etc. can cause unwanted colouration or blurring of the sound image. These can be minimised by placing the loud speaker clear of reflective surfaces.

Minimum clearances
Sufficient clearance for cooling of 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 3 centimeters (13/16”) 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 Genelec 4020C offers several mounting options: On the base of the loudspeaker is a 3/8” UNC threaded hole compatible with a standard microphone stand. On the rear there are two M6x10 mm threaded holes for Omnimount® size 20.5 brackets or the keyhole wall mount adapter provided with the loudspeaker. See Genelec Accessories Catalogue on www.genelec.com for a complete list of mounting hardware options.

Maintenance
No user serviceable parts are to be found within the amplifier unit. Any maintenance or repair of the 4020C unit should only be undertaken by qualified service personnel.

Safety considerations

Although the 4020C has been designed in accordance with international safety standards, the following warnings and cautions should be observed to ensure safe operation and to maintain the loud-speaker 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 two years against faults in materials or workmanship. Refer to supplier for full sales and guarantee terms.

Compliance to FCC rules
This device complies with part 15 of the FCC Rules. Operation is subject to the following 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 SPECIFICATIONS

• Lower cut-off frequency, –6 dB: < 56 Hz

• Upper cut-off frequency, –6 dB: > 25 kHz

• Accuracy of frequency response: 62 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 > 100 dB SPL

• Maximum long term RMS acoustic output in same conditions with IEC weighted noise (limited by driver unit protection circuit): @ 1 m > 93 dB SPL

• Maximum peak acoustic output per pair @ 1 m distance with music material: > 107 dB

• Self generated noise level in fr ee field @ 1 m on axis: < 5 dB (A-weighted)

• Harmonic distortion at 85 dB SPL @ 1 m on axis:
  Freq: 50…200 Hz < 3 %

  200 Hz < 0.5 %

• Drivers: Bass 105 mm (4 in) cone
  Treble 19 mm (3/4 in) metal dome
  Both drivers are magnetically shielded

• Weight: 3.1 kg (6.8 lb)

• Dimensions:

  • Height 226 mm (87/8 in)
  • Width 151 mm (6 in)
  • Depth 142 mm (55/8 in)

CROSSOVER SECTION

• Input connector: Balanced Euroblock 10 kOhm
• Input level for 100 dB SPL output at 1 m: -6 dBu at volume control max
• Level control range relative to max output: -40 dB (constantly variable)
• Crossover frequency, Bass/Treble: 3.0 kHz
• Treble Tilt control operating range: 0 to +2 dB @ 15 kHz
• Bass Roll-Off control: –4 dB step @ 65 Hz
• Bass Tilt control operating range in –2 dB steps: 0 to –6 dB @ 100 Hz

The ‘CAL’ position is with all tone contr ols set to ‘off’ and the input sensitivity control to maximum (fully clockwise).

AMPLIFIER SECTION

Bass amplifier output power: 50 W
Treble amplifier output power: 50 W
Long term output power is limited by driver unit protection circuitry.

• Amplifier system distortion at nominal output:
  THD < 0.05 %

• Mains voltage: 100-240 V AC 50-60 Hz

• Voltage operating range: ±10 %

• Power consumption:
  Idle 3 W
  Standby in ISS mode <0.5 W
  Full output 60 W

International enquiries
Genelec, Olvitie 5
FI 74100, Iisalmi, Finland
Phone +358 17 83881
Fax +358 17 812 267
Email genelec@genelec.com

In Sweden
Genelec Sverige
Ellipsvägen 10B
P.O. Box 2036,
S-127 02 Skärholmen
Phone +46 8 449 5220
Fax +46 8 708 7071
Email info@genelec.com

In the USA
Genelec, Inc., 7 Tech Circle
Natick, MA 01760, USA
Phone +1 508 652 0900
Fax +1 508 652 0909
Email genelec.usa@genelec.com

In China
Beijing Genelec Audio Co.Ltd
B33-101
Universal Business Park
No. 10 Jiuxianquiao Road
Chaoyang District
Beijing 100015, China
Phone +86 86 5823 2014,
400 700 4978
Email genelec.china@genelec.com

www.genelec.com

References

• World Leader in Studio Monitors - Genelec.com

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