Barlos Posted February 16, 2015 Share Posted February 16, 2015 Hi, I'm rewiring the sound system in one of our bars (mains cable has been used for both signal and speakers) and I'm struggling with the layout. Could any of you give me some pointers. The bar is rather large and the sound system is split into 2 zones with a cloud 2 zone mixer. We have 12 8 ohm tops and 3 amps and I'm looking to add 3 subs to give it a bit of balls. Zone 18 8 ohm Tops and 2 8 ohm subs Zone 2 4 8 ohm Tops and 1 8 ohm sub.The amps are 2 QSC RMX 1450s - 4 ohm bridged 1400 Watts, 2 ohm stereo 700 watts pch and 1 QSC USA 900 - 8 ohms Bridged 900 watts, 2 ohm stereo 550 watts pch. What is the best way to wire these together? The subs have built in crossovers with an out to the tops. I've tried to work out the resistance but the built in crossover throws me off. I could buy a rack mount crossover if need be.Thanks in advance,Col Link to comment Share on other sites More sharing options...
themadhippy Posted February 16, 2015 Share Posted February 16, 2015 . I've tried to work out the resistance but the built in crossover throws me offassuming its designed for an 8 ohm top box the whole network will be 8 ohms Link to comment Share on other sites More sharing options...
Barlos Posted February 16, 2015 Author Share Posted February 16, 2015 . I've tried to work out the resistance but the built in crossover throws me offassuming its designed for an 8 ohm top box the whole network will be 8 ohms That's what I was thinking, the amp only sees the crossover? Link to comment Share on other sites More sharing options...
sam.spoons Posted February 16, 2015 Share Posted February 16, 2015 If you series/parallel wire the tops you'll end up with a 8 ohm load on the HPF output of the sub's crossover. I think any other wiring would mess with the crossover frequency. Link to comment Share on other sites More sharing options...
Barlos Posted February 16, 2015 Author Share Posted February 16, 2015 If you series/parallel wire the tops you'll end up with a 8 ohm load on the HPF output of the sub's crossover. I think any other wiring would mess with the crossover frequency. Will this cause phase problems? Link to comment Share on other sites More sharing options...
sam.spoons Posted February 16, 2015 Share Posted February 16, 2015 Not if you wire it with everything correctly polarised. It'll require some logical thinking and possibly some special speakon adapters though. Link to comment Share on other sites More sharing options...
stu00c Posted February 17, 2015 Share Posted February 17, 2015 The subs have built in crossovers with an out to the tops. If budget allowed, I would definitely use an external active crossover rather than the passive crossover in the subs. The main reason being that you will be able to balance the level of the subs and tops. Being able to set the crossover point and type of filter is also a bonus. Relying on the passive crossover means that if the sensitivity of your tops is different to that of the loudspeaker the designer expected to be connected, then you will likely have something that is unbalanced (too much or not enough bass). Stu Link to comment Share on other sites More sharing options...
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