Just to give some perspective I'll describe my system that is on the other end of extreme.For me I not only want to sound like a band I want to feel like a band.
I use a laptop with RB. My tracks are then setup to go to an ESI Gigaport HD+ that is a USB 8 channel Playback interface. These 8 channels then go into a 16 channel Hardware mixer. I use a TC Helicon Harmony GXT for vocals into 2 more channels and finally play bass through a Tech 21 VT Bass pre into another channel.The output of the mixer then goes to a 31 band mono EQ. The output of the EQ to a BBE Sonic Maximiser.Then to an active xover. The Freq. above 100 Hz goes to a 1000 Watt Crown and out to a pair of 15"& horn tops. The freq below 100Hz goes to a 1500 watt Crown and out to a pair of 15" subs.
I have pre built everything so that setup is about 20 minutes.
I also have a pair of 10" subs and 10" + horn tops that I can use instead of the big speakers for smaller gigs. All else stays the same.


John
ESI Gigaport HD+
Lenovo Turion II /4 Gig Ram/ Win7x64 be
15.6" Monitor
"The only Band is a Real Band"
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