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Author Topic: Need help to mount QSC ISA amplifiers with a cp55 Elia Orselli Film Handler Posts: 42 From: Imola, Bologna, Italy Registered: Feb 2008 posted 03-14-2009 08:50 AM                        I bought two QSC ISA 450 to replace 4 old Cinemeccanica C300 amplifiers and I have three problems to solve: 1. What connector is better? XLR or terminal block? 2. What low frequency filter is better? 30 or 70Hz? Speakers are KCS 2000 series ( ) 3. ISA450 has 1.07V of imput sensitivity so I have to solder again W5, W6, W7 and W8 jumpers on cat 242 of the cp55. These jumpers now are cut I think because the imput sensitivity of C300s amplifier is more than 1.23V. Do I have to change other elements on the cp (in the manual I downloaded there aren't the last lines of the paragraph about this operation)? Thanks a lot. Elia Orselli - Cinema Cappuccini Imola, Italy [ 03-16-2009, 02:18 AM: Message edited by: Elia Orselli ]  |  IP: Logged Samuel Hynds Film Handler Posts: 50 From: Riverside, CA, USA Registered: Aug 2004 posted 03-16-2009 09:40 AM                     for your first question - the XLR input or the terminal block would work; just depends on if you want to change the wiring from the CP55 to the amplifiers. You could use a pre-made cable with XLR male connectors & cut the cable to wire to the terminal strip of the CP55. As for the High pass filters of the ISA - use the 30Hz setting for your stage loudspeakers & the 70Hz for your surrounds. Turn the filter off for your subwoofer. For the jumpers on the CP55 - it may work - you'll have to turn down the output level for each channel output of the CP55. Good Luck - Sam Hynds Product Specialist - Cinema QSC Audio Products, LLC  |  IP: Logged Elia Orselli Film Handler Posts: 42 From: Imola, Bologna, Italy Registered: Feb 2008 posted 03-16-2009 12:29 PM                        Hi Sam, Thanks for your complete reply. quote: Samuel Hynds it may work You mean that I don't have to resolder the jumpers?  |  IP: Logged

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