Members Bugzie Posted September 7, 2014 Members Share Posted September 7, 2014 Was asked a question that I really couldn't answer. Can a bridged 2450 be used to power a pair of JBL MRX 528's. They are 4 ohm cabs, so I said I wasn't sure,but I wouldn't due to the 2 ohm load. The power would be good but the impedence load made me question it. Can someone share some wisdom? I also questioned what the amp would put out in watts as QSC doesn't list a 2 ohm rating. Link to comment Share on other sites More sharing options...
Members agedhorse Posted September 7, 2014 Members Share Posted September 7, 2014 Simple answer is no, you can not bridge that amp into 2 ohms. One box per channel in stereo mode is about the best you can do. Link to comment Share on other sites More sharing options...
Members Bugzie Posted September 7, 2014 Author Members Share Posted September 7, 2014 I didn't think it was adviseable, thanks Andy. Driven 2 channels it wouldn't be nearly powerful enough. I run a pair off an old PL 236 and it's about perfectly matched. But that's 1100 WPC, 500 WPC probably wouldn't even wake them up. Link to comment Share on other sites More sharing options...
CMS Author Craig Vecchione Posted September 7, 2014 CMS Author Share Posted September 7, 2014 It would work better than you may think. If that's all you've got at the moment, it'll do in a pinch. Something in the range of the 236 is of course just about perfect power. Link to comment Share on other sites More sharing options...
Members agedhorse Posted September 7, 2014 Members Share Posted September 7, 2014 Where do you get 500w/chan at 4 ohms for the 2450? In the real world, the difference between the 2450 and the 236 is less than 2dB, especially factoring in power compression. Link to comment Share on other sites More sharing options...
CMS Author Craig Vecchione Posted September 7, 2014 CMS Author Share Posted September 7, 2014 Andy, he may have gotten the 500w figure from some of the specs QSC has published for the 2450...IIRC they showed an @1kHz power spec and a 20-20kHz spec, or some other such variation that had different figures. Link to comment Share on other sites More sharing options...
Members Unalaska Posted September 7, 2014 Members Share Posted September 7, 2014 IIRC the 2450 puts out around 750 @ 4 ohms per channel, I think you'll find it's a good match. This summer I've run into 2 different sound "experts" with amps bridged into 2 ohm loads. On of them use a behringer ep4k bridged into a pair of jbl jrx215 AND jrx118 subs. It was... Interesting. Link to comment Share on other sites More sharing options...
Members agedhorse Posted September 7, 2014 Members Share Posted September 7, 2014 IIRC the 2450 puts out around 750 @ 4 ohms per channel' date=' I think you'll find it's a good match. This summer I've run into 2 different sound "experts" with amps bridged into 2 ohm loads. On of them use a behringer ep4k bridged into a pair of jbl jrx215 AND jrx118 subs. It was... Interesting.[/quote'] And as an amp designer, I shudder at the thought of stupid becoming even more stupid... Link to comment Share on other sites More sharing options...
CMS Author Craig Vecchione Posted September 8, 2014 CMS Author Share Posted September 8, 2014 I dug out the manual that came with my 2450's. QS lists FTC power (20-20k @ .1% THD) as 650w and IEC power (1 kHz @ .1% THD) as 750w. Link to comment Share on other sites More sharing options...
Members agedhorse Posted September 8, 2014 Members Share Posted September 8, 2014 The 750 watt number is what I would use, most of the derating comes between 10kHz and 20kHz. Link to comment Share on other sites More sharing options...
Members RoadRanger Posted September 12, 2014 Members Share Posted September 12, 2014 If you are just looking for cheap power and don't care about weight (an install?) a used pair of bridged RMX1450's would do it - I used to use one into a pair of 500wrms 8 ohm subs... Link to comment Share on other sites More sharing options...
Members Bugzie Posted September 12, 2014 Author Members Share Posted September 12, 2014 oops I was thinking the 8 ohm rating on the 2450 Link to comment Share on other sites More sharing options...
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