Polycom EF2241 manual Contacting Technical Support, Email vortex@polycom.com

TROUBLESHOOTING

If you suspect the loudspeaker is introducing nonlinearities into the room acoustic path, take these steps to minimize its influence on the echo canceller.

•Keep the loudspeaker’s volume level at less than three-eighths of full scale. If higher volume is required, the EF2241 should operate effectively at volume set- tings of up to 50 percent of full scale. At more than 50 percent, most audio sys- tems and loudspeakers introduce significant nonlinearities. The EF2241 may not adapt under these conditions, and echoes may be heard.

•If the loudspeaker has a bass control, lower it. Excessive bass can cause a boomy effect that is nonlinear. In addition, excessive bass may cause substantial mechanical coupling to the microphone through vibrations induced in the hous- ings and support structures.

•Increase the separation distance between microphones and the loudspeaker. The EF2241 handles up to 10 dB of room gain between the loudspeaker and the microphone. You may be exceeding this limit if the loudspeaker is pointed directly at the microphones or if the loudspeaker volume is excessive (loud- speaker placement is not critical, but it should not be pointed directly at the microphones).

CONTACTING TECHNICAL SUPPORT

If these troubleshooting guidelines don’t resolve the problem you are experiencing with the EF2241, please check our web site (http://www.polycom.com) for the most current technical support information (go to Products & Services, then to Voice Prod- ucts, then to Installed Voice Systems). If you have further questions, please contact us at:

Applications Engineering

Polycom Installed Voice Business Group 1720 Peachtree Street NW Suite 220 Atlanta, GA 30309-2439

Phone: (800) 932-2774

Fax: (404) 892-2512

Email: vortex@polycom.com

Before contacting us, please review the warranty and repair policy on page 55.

© Polycom, Inc. 43 VORTEX EF2241 Reference Manual