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Introduction

Congratulations and a thank-you for the purchase of this Genel-
ec 1238CF DSP Loudspeaker. This loudspeaker is designed to 
integrate easily into the digital production environment. There are 
several ways to configure and operate the DSP loudspeaker for a 
wide variety of high quality audio applications. The 1238CF also 
has an analog input, making it a versatile and intelligent replace-
ment for analog loudspeakers.

This manual addresses setting up and using the 1238CF DSP 
loudspeaker in stand-alone mode without the Genelec Loud-
speaker Manager GLM™ and the proprietary Genelec loud-
speaker control network. Use with the GLM™ is described in the 
DSP System Operating Manual.

EC Declaration Of Conformity

This is to certify that Genelec 1238CF DSP loudspeakers con-
form to the following standards:
 
Safety: EN 60065: 2002 + A1: 2006 + A11:2008 / IEC 60065: 
2001 7th E A1: 2005
EMC: EN 55020: 2007, EN 55013: (2001) + A1: 2003 + A2: 2006 
EN 61000-3-2 (2006) and EN 61000-3-3 (1995) + A1: 2001 + 
A2: 2005
 
The products herewith comply with the requirements of The Low 
Voltage Directive 2006/95/EC, EMC Directive 2004/108/EC and 
Energy related Products (ErP) Directive 2009/125/EC.

Signed:
  Ilpo 

Martikainen

Position:   

Chairman of the Board

Date:  

30-September-2010

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 equip-
ment 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.

Safety Considerations

Although the 1238CF has been designed in accordance with 
international safety standards, to ensure safe operation and to 
maintain the loudspeaker under safe operating conditions, the 
following warnings and precautions must be observed:

•  Servicing and adjustment must only be performed by 

qualified service personnel. The loudspeaker enclosure 
must not be opened.

•  Do not use this product with an unearthed mains cable or 

a mains connection without the protective earth contact as 
this may lead to personal  injury.

•  To prevent fire or electric shock, do not expose the unit to 

water or moisture. 

•   Do not place any objects filled with liquid, such as vases on 

the loudspeaker or near it. 

•  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.

•  Free flow of air behind the loudspeaker is necessary to 

maintain sufficient cooling. 

•   Do not obstruct airflow around the loudspeakers.
•   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.

WARNING! 

The Genelec 1238CF loudspeaker is capable of producing sound 
pressure levels in excess of 85 dB, which may cause permanent 
hearing damage.

System

The Genelec 1238CF DSP Loudspeaker is designed for precise 
monitoring of 24 bit/192 kHz AES/EBU digital audio signal or 
line level analog audio signal. The 1238CF is fully compatible 
with Genelec Loudspeaker Manager GLM™ and the proprietary 
Genelec loudspeaker control network and Genelec 7271A DSP 
Active Subwoofer, but can also be used independently of these. 
The 1238CF features high SPL output and low colouration in 

Summary of Contents for 1238CFM

Page 1: ...Genelec 1238CF DSP Loudspeaker Operating Manual 1238CF ...

Page 2: ...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 C...

Page 3: ...ital 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 l...

Page 4: ...rs 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 see Figure 2 Vertical placement is mandatory to maintain cooling behind the loud speaker Maintain Symmetry Check that the loudspeakers are placed symmetrically and at an equal distance from the listening pos...

Page 5: ...ing the effects of the adjustments however careful listening with suitable test recordings can also lead to good re sults if a test system is not available Table 1 shows some typical settings in various situations Always start adjustment by setting all switches to OFF position Measure or listen systematically through the different combina tions of settings to find the best frequency balance See Ta...

Page 6: ...ck of each loudspeaker to enable the internal Acoustic Settings and then turn it on again To set the phase control on the subwoofer connect the Center channel output of the subwoofer to the loudspeaker to be used to align phase Follow the instructions in the subwoofer user manual for setting phase and level Maintenance No user serviceable parts are to be found within the loudspeaker enclosure Any ...

Page 7: ... 1238CF Bass amplifier short term output power Midrange amplifier short term output power Treble amplifier short term output power Long term output power is limited by driver unit protection circuitry 150 W at 4 Ohm load 120 W at 8 Ohm load 120 W at 8 Ohm load Slew rate 80 V us Amplifier system THD at nominal output 0 05 Signal to Noise ratio referred to full output Bass Midrange Treble 100 dB 100...

Page 8: ...S please contact 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 please contact Beijing Genelec Audio Co Ltd Jianwai SOHO Tower 12 Room 2605 D 1504 Chaoyang District Beijing 100022 China Phone 86 10 8580 2180 Fax 86 10 8580 2181 Email genelec china genelec com In Sweden please contact Genelec Sverige Ellipsvägen 10B P O B...

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