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Author Topic: Surround sound wiring Steve Moore Expert Film Handler Posts: 211 From: Leeds, West Yorks, UK Registered: Apr 2008 posted 04-10-2014 12:41 PM                     Dennis, you are right to agree with Ken's agreeing with Brad's agreeing with Scott. As for that QSC amp, in theory it would drive into 2ohms OK, according to it's manual, but I'd be a little on edge going that low; unless they are not being driven too hard. I have series'd two up and then paralleled one across the two in series before in a screen with three per wall, however the single speaker gets more punishment and would be more prone to damage. Possible cheaper than a new amp is purchase another pair of speakers and put 4 a side, but that depends on what speakers you are running and if they are available.  |  IP: Logged John Eickhof Jedi Master Film Handler Posts: 588 From: Wendell, ID USA Registered: Jan 2000 posted 04-10-2014 01:02 PM                        Save the trouble, parallel each set of three then series them at the amplifier nominal impedance will be abou 3.75 ohms and there will be no reaction with impedance from voice coil movement.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 04-10-2014 01:20 PM                     John... Series parallel was thrown out 20 years ago. Speakers in series parallel cause too much resultant phase shift and other nasty distortion's. Will it work? Sure. But it is typically not done any more. And that's one reason for the 4 channel QSC power amps! Mark  |  IP: Logged Paul Looker Film Handler Posts: 83 From: Pittsburgh, PA/United States Registered: Sep 2009 posted 04-10-2014 02:27 PM                     It says. 4 ohms per channel. 8 in mono bridge mode  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 04-10-2014 03:16 PM                     Same here: http://www.tristatetheatre.com/Series_One_Manual.pdf So it is only spec'd to a minimum of 4 ohms. That means, per spec, parallel all three speakers is not possible. I have no experience with this type of amp to guess wether they will deal with 2.6Ohms at the required power level in real life. Some amps do, some not. Check the speakers as well, they should say 4 or 8 ohms at the back. Though it is unlikely they would have 4ohms. - Carsten  |  IP: Logged Ken Lackner Phenomenal Film Handler Posts: 1907 From: Atlanta, GA, USA Registered: Sep 2001 posted 04-10-2014 03:19 PM                     quote: John Eickhof Save the trouble, parallel each set of three then series them at the amplifier nominal impedance will be abou 3.75 ohms and there will be no reaction with impedance from voice coil movement. Unless I'm misunderstanding what you're suggesting, that will not satisfy his requirements. He needs TWO channels, each with three speakers. Wiring the three speakers in parallel is best, but the two groups of three would then not be wired in series. quote: Paul Looker It says. 4 ohms per channel. 8 in mono bridge mode. Then as Carsten points out, you do not want to wire all three parallel with this amp. Series-parallel isn't ideal, but it would be your best option. Thank you all for agreeing with me agreeing with Brad agreeing with Scott. You're the best.  |  IP: Logged Jarod Reddig Jedi Master Film Handler Posts: 513 From: Hays, Ks Registered: Jun 2011 posted 04-10-2014 05:54 PM                     You could for now just run two surrounds per side parallel per channel until you find/buy another amp. Think I'd pick the two closest to the screen but that kinda depends on the layout. If your first surround from the screen is rather close to it than maybe pick the back two.  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 04-10-2014 06:19 PM                     I still do series parallel speaker arrays some fairly large and don't really have a issue with that The best solution would be to add 2 more speakers on the rear wall and then one would be able to balance the load  |  IP: Logged Jarod Reddig Jedi Master Film Handler Posts: 513 From: Hays, Ks Registered: Jun 2011 posted 04-11-2014 12:37 AM                     Curious what impendance the surrounds are. Could hook a Multimeter/ohm tester to one of the wire runs and find out.  |  IP: Logged

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