DB Technologies is a sister company of RCF and offers similar (not identical) products. EAW has some smaller offereings in their Radius RSX and KF series, as does D.A.S. The Presonus CDL12P is an interesting constant curve array, and many companies offer smaller line source "column" type systems that can work well in smaller venues. There are more, but remember for smaller venues (and many venues of all sizes) a "line array" may be a poor choice. If you don't have taller ceilings to "fly" the array and don't have an array length that approaches 8 to 10 feet of length, you should look at other options. A four foot long "line array" really will not produce the line source effect that line arrays should emulate, and are far more expensive that very good point source systems.