Join Date: Feb 2009
Location: Bakersfield, CA
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1. Split a side surround input channel into two or three side surround channels. This would be a common application where the single side surround channel needs to be routed to two different side surround speakers and have each of those side surround speakers individually managed with respect to SPL, delays, filters, etc.
2. Split the LFE input channel into multiple output channels. This would be where two, three, or four subwoofers are being used in a room and each of those subwoofers requires independent management of filters, spl, phase/delay. This is a common practice used to manage low frequency response at the seating locations.
ANSWER: Both cases are as described. However a software upgrade now being planned will add a 'crosspoint switch' to the inputs. That will allow a single input to be routed to 'n' channels concurrently solving the described problem. The software within the AP20 can be updated via USB memory stick inserted into the front panel or by connecting to the internet.
3. This is clearly very much a "pro" piece. You are warned, before you run any EQ (including DIRAC) to be certain you have your crossovers correct (for example).
ANSWER: Oh yea, no hand holding here! You have complete freedom to run subwoofer tones into your tweeters.
4. The AP-20 provides only three parametric filters per channel to manage low frequency response. This falls way short of what is typically required in a residential sized to room (even a properly treated room) to manage the low frequency response of subwoofers in the room. Three PEQ filters per channel are likely sufficient for very large venues; however, even with that, your multiple subwoofer channels would have to be defined, split and routed prior to the input side of the AP-20 due to the limitation preventing splitting the LFE channel into multiple output channels inside the AP-20 itself. EDIT: What would have been a better approach (in my mind anyway) is to not limit the PEQ filters by channel, rather to have 3x16 PEQ filters available which can be applied to any output channel as required (until the bank runs out of filters).
ANSWER: I didn't want to put parametrics in the box. You simply don't need them when using Dirac Live. Nor do you need 3rd octave filters. However others pointed out that the AP20 would not be accepted by the 'traditional types' installing commercial spaces if they weren't in there. As result we put the industry standard collection of PEQ and 3rd octave filters in the product.
If you are a traditionalist or for whatever reason don't want to use Dirac Live you can apply the AP20 using traditional techniques. The AP20 contains a mic preamp, spectrum analyzer and noise source to facilitate that process. The results will be as good or better than when using a competitors product as we took great pains (and expense) to create the best sounding box possible. However if you install your room using the Dirac Live tools (my preference) you don't need PEQ nor 3rd octave filters. In fact using the PEQ or 3rd octave filters after applying Dirac Live is poor practice and can only degrade performance. Best practice is to make all of your changes using the Dirac Live editor and then push the changes to the processor. The DL2 does not include PEQ nor 3rd octave filters.
I hope this answers your questions.