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Author Topic: QSC USA amps Tom Wienholt Master Film Handler Posts: 371 From: Towson, MD, USA Registered: Dec 2002 posted 04-13-2005 05:51 PM                     How should the dip switches on the back of a QSC USA900 amp be set? Should the switch be set for a 50Hz or 30Hz cut off? I assume that the screen channels and surrounds should be cut off at 50Hz and subs at 30Hz. Am I correct? Thanks.  |  IP: Logged Samuel Hynds Film Handler Posts: 50 From: Riverside, CA, USA Registered: Aug 2004 posted 04-14-2005 12:19 PM                     Hi Tom, For the Screen Channels (Left, Center & Right) set for a 30Hz cut off. For the Surround channels set for a 50Hz cut off. For the Subwoofer turn the cut off feature OFF - this way you will go down to about 25Hz or so. Have fun Sam Hynds - Product Specialist, Cinema  |  IP: Logged Tom Wienholt Master Film Handler Posts: 371 From: Towson, MD, USA Registered: Dec 2002 posted 04-14-2005 05:29 PM                     I don't think that the cut off feature can be turned off. It has to either be set for 30Hz or 50Hz.  |  IP: Logged Richard Fowler Film God Posts: 2392 From: Ft. Lauderdale, FL, USA Registered: Jun 2001 posted 04-14-2005 05:40 PM                     Tom, the switch next to the filter switch ( #4 / #7 ) will turn on and off the filter function. Sam works for QSC...so he is a product specialist for that company  |  IP: Logged Antonio Marcheselli Phenomenal Film Handler Posts: 1260 From: Florence, Italy Registered: Mar 2000 posted 04-14-2005 09:17 PM                        Hi Sam! Nice to see you! Does not 50Hz filter adds a little boost on the lowest end before the cut when enabled? Just to check if I correctly understood the DCA manual! Bye Antonio  |  IP: Logged Samuel Hynds Film Handler Posts: 50 From: Riverside, CA, USA Registered: Aug 2004 posted 04-19-2005 01:24 PM                     Thanks Richard for the kind remarks. Antonio - Yes the DCA with the 50Hz High Pass engaged does boost a little bit, about 1dB very close to the cut off frequency. This is done so you get a little better bass response, while protecting the loudspeaker from low bass signals. Ciao, Sam  |  IP: Logged Antonio Marcheselli Phenomenal Film Handler Posts: 1260 From: Florence, Italy Registered: Mar 2000 posted 04-21-2005 05:48 AM                        Only 1 dB, nice to know it! Bye Antonio  |  IP: Logged

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