i am new to qsc products, i got an rmx 2450. well, youll probably gonna think im stupid but here it goes any help is very appreciated. i have 2 cerwin vega lr36 subs 8ohm. if i bridge both subs (8ohms each) does the amp run mono at 4 ohms? do you think it could run both?
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Re: bridging subs mono mode
Sat, September 22, 2007 - 1:11 PMi believe you can do so. with 8ohm subs you can run the amp in bridged mono as long as the speakers are connected/wired in parallel (daisy chain) thus presenting a 4ohm load to the amp. In theory you'd get more power, but in practice I'm not sure whether you achieve benefit. The big thing to ensure is that the subs are indeed 8ohm and that the thru connection on the subs are parallel
some useful links/info...
www.qscaudio.com/products/...mx/rmx.htm
www.cerwinvega.com/manuals/...H2005.pdf
Daisy-Chaining Speakers: Since all Vega!Bass Folded Horns are equipped with a pair of speakons and a pair of 1/4” input terminals (that are all parallel inputs), it is possible to daisy-chain speakers by connecting the output of the powered amplifier to one input , and a second subwoofer to the other one. Since each folded horn is a 8 ohm load, this will allow the amplifier to operate properly and avoid overheating.
As mentioned above, all of our folded horns have an nominal impedance of 8 ohms. Since most professional amplifiers are designed to provide stable performance at a load impedance of 4 ohms or 8 ohms. Cerwin-Vega! recommends the no more than two 8 ohm speaker systems be daisy-chained together.
www.faceaudio.com/support_faq.html#q4
Q: When should I put my amplifier into Bridge/Mono mode?
A: Bridge/Mono mode allows a higher load (usually around 2ohms) to be handled more effectively by the amp. It puts the amplifier into a "push, pull" configuration, utilizing both sides of the amp into one single output. Our real answer here is that you should only run in bridged mode when you simply have no other choice. You should always choose the right amp for the load being placed on it. Sometimes, however, you get stuck in a situation requiring more power than you have at hand in stereo mode. Bridged mode can allow you more power handling capabilities in a pinch. We don’t recommend making it a habit.
www.crownaudio.com/amp_htm/...loads.htm
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Re: bridging subs mono mode
Sun, September 23, 2007 - 12:33 PMFor subs, mono is the best way to go. Wire the subs in parallel and set the amp to bridge mono and you're all set. The amp will drive the subs at 4 ohms. -
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Re: bridging subs mono mode
Sun, September 23, 2007 - 5:25 PMIt is best to run two seperate cords to the subs.
When you can get an amp that can give you more then enough power to drive the cabs.
More speakers are blown by under powering then by over powering a speaker.
I used to drive my subs in mono mode. But over the years I find that an amplifier with more power
then I need sounds way better.
It is heavy. Sometime I yearn for the underpowered days. -
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Re: bridging subs mono mode
Wed, September 26, 2007 - 11:06 AMYou should feed your cabinets double the program rated watts...overstressing and clipping your amps is much more the cause of blowing speakers than overpowering them with a clean signal.
As to the weight, you should look into amps with switching power supplies...like the plx series from QSC.
Major wattage, light weight. But you will pay a bit more.
Worth it, IMHO, if you use them alot.
Oh, and most amps will not run a 2 ohm load bridged...so stop at 4ohms...
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Re: bridging subs mono mode
Sun, September 23, 2007 - 4:53 PMthank you very much guys. -
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Re: bridging subs mono mode
Thu, September 27, 2007 - 8:42 AMA hot amp sounds like crap @ 4 AM.
Always strive to have a clean sound at the end of the show.
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