Quote:Originally Posted by beastaudio
"what is the difference between the gv-eq, deq, peq, Dynamics Processing:Compressor/Expander/Limiter?"
Let's start with Limiters because that is the easiest one. Basically above a given input signal the output will not go higher; it is basically a brickwall. If it is chopping the heads off the peaks like that you can imagine the problem that causes distortion-wise. So...
This leads nicely into the Dynamics processor; a compressor allows you to define how early and aggressively the device will attack the peaks before the limiter point is reached and engages; softening, smoothing and slowing the blow, rather than an abrupt dead-stop at full output clip and/or full excursion.
So obviously... it is better to limit than to bottom out your subwoofer and destroy it. So you set that value to just under max excursion, given a 0db Ref sine-sweep input. Guaranteeing no bottoming, and using the compressor to ease into the mechanical limits of the thing.
Note: I haven't tested it but I would hope that Behringer implemented it as a proper soft-limiter with some input gain servo intelligence behind it rather than a pure brickwall. (I'm curious enough to go forth and test that now
Behringer's implementation of a "Dynamics Expander", is actually a noisegate. Basically, below a given input level, the signal will not be outputted.
Ok so far all the above was applied on the full signal bandwidth (DC to nyquist).
So that leads nicely into the EQ bits.
Now before we go any further you have to understand the components that define how EQ's operate.
1) Input Signal Level (in db) (aka Threshold) (dynamics only)
2) Output Gain (in db) (the positive or negative amount you desire)
3) Aggressiveness (X db Input for Y db Output) (aka Ratio) (dynamics only)
4) Knee (i.e the Aggressiveness nearest the Threshold value) (dynamics only)
and Last but not least:
5) Center Frequency (in Hz) (aka CF) (i.e the Frequency you care about)
6) Bandwidth (in octaves) (aka BW or QF) (i.e the Frequency range +-3db slope relative to the CF to which EQ will also be affected.)
Ok let's continue...
Let's start with Static EQ, that is the easiest.
It is basically a slider-bar style EQ, it only lets you adjust one thing, the Output Gain. Not very useful, unless your hard up.
Everything else about it is fixed: fixed CF, fixed BW; and no Threshold at all.
(For this reason, those style devices are usually much cheaper.)
Next step up is the GV-EQ, it allows that and BW adjustment, and for this reason is usually digital-domain only from this point onward, and done on a computer screen.
Next step up is PEQ, it allows that and user selectable CF adjustment.
Next step up is DEQ, it allows all 6 adjustables.
DEQ, as you probably guessed, is basically a user selectable frequency-based and level-based compressor/expander(a true gain expander FYI, not a noisegate).
The next step up is fully-auto EQ, which involves a microphone; computer does everything for you, but only when it is on the config mode and playing sweeps. (audyssey)
The next step up is semi-auto EQ, allows you to define a target graph. (Dirac etc)
The next step up is RTA-EQ/FBD, basically auto-EQ, but is always-on, actively listening to the in-room response and making corrections to give the flattest average response and does echo cancellation.
Have I fully cooked your noggin yet?