|Originally posted by noah katz
"Also, we are switching from the Rane PE-17 parametric EQ to a QSC DSP-4 digital EQ. It is a digital EQ & in addition, the QSC piece can tame room resonances. I have a dandy at 25-30 hz."
What can the QSC do that the Rane can't to allow this?
Of course both the Rane PE-17 and the QSC DSP-4 can both be used to help tame resonances by selective filtering. I see the key differences in the precision and capacity of the two pieces of equipment.
The Rane is a pure analog 5-channel parametric equalizer with high and low cut filters and variable input and output gain.
The QSC DSP series of digital signal processors are full digital devices with fully configurable parametric equalizer "blocks" with up to 8 channels per equalizer block. Gain blocks, shelf filters, low and high pass filters are also available. Equalizer channels have up to 12dB of gain (same as the Rane PE-17) and as much cut as you like (Rane is -15dB per channel), with Q adjustable from 0.3 to 500 (Rane is 0.67 to 43)
The QSC gives you the ability to measure the room response, and then graphically build the equalization curve to remove energy from the resonant frequencies and smooth the room response. See picture below. The complexity of this curve is only limited by the amount of processing power in the DSP.http://www.qscaudio.com/images/produ...Sigman1big.jpg
Pricing (for new units) is very similar between the two.
The QSC does require a computer to set it up. But once set up you can back up your settings, load different settings and even A-B different settings on the fly. The Rane's rotary knobs are subject to bumping and "fingerpoken".
Bottom line: They can both do the job, the DSP is just a more precise and sophisticated tool.