Originally Posted by dancjodanc
It's been a while since I ran DIRAC...and going to do another set up....and had a question. After all the levels are set, don't you have to make sure all x-overs are on 'Full' before you run DIRAC? What about delays?
Here's notes I've written/plaguarized on my own Dirac setup which may help you (I have 5 Aerial 7ts, 4 KEF in ceiling THX speakers, and 2 JL Audio f212 subwoofers chained) (note that DIRAC I think disengaged SSP settings for x-vers, nonetheless, as my own precaution I manually set all speakers to x-over "Full" and have speaker distances entered in the CBIV-A menu prior to running Dirac. Then after Dirac is all done and the filter loaded, I set the crossovers and redo speaker levels - see below for more detailed info)
Dirac Live Setup Procedure with Theta Casablanca IV-A:
Before Dirac setup, you turn off all crossovers and set all speakers full range with 1 subwoofer (chain multiple subwoofers). (Technically, Dirac overrides CBIV-A crossovers, slopes and delays, so really doesn’t matter what the CBIV crossovers, slopes and delays are set to). Set speaker levels - play a 2 channel music CD on infinite repeat during speaker level setup (which will initiate being able to use internal test tones) so that all speakers and the 1 subwoofer are equal in level at 70 dB. Use CBIV-A’s built-in speaker level test tones for this.
On first page of Dirac setup select Custom, 10 speakers, Theta Casablanca with 4 heights. When you get to the mic setup page, the first time around, only Left and Right channel show. You then have to enter the other 8 channels manually and then rescan. It is this rescan step that seems to cause the subwoofer check mark to be de-selected. Before Dirac measurement step, take one last look to see that the subwoofer channel is checked as "subwoofer."
Now perform the Dirac measurements. Play a 2 channel music CD on infinite repeat during spl level setup and Dirac setup. Since the music is playing, how could you set up mic gain and start any measurement? When you are ready to set up the mic gain, click on the little arrow/play button of the left front channel, the music would then mute so you could start calibrating and measuring. Use couch/sofa measurements, not chair, as former best gauges room characteristics and will sound the best. Use the “Save Project” and “Save Target” as you perform the measurements and setup the crossovers. Do Dirac measurements with leather recliners upright not reclined.
STOP the CD before uploading the Dirac file to CBIV-A or uploading will fail. If you have multiple Dirac filters, the CB IV-A only holds one Dirac filter at a time. In order to load a different filter, connect the CBIV-A via USB cable to laptop, connect microphone via USB cable to laptop, open Dirac program on laptop, and d0 not do anything in the Dirac program except to load the new filter. Then go direct to load the new filter to the CBIV-A without clicking on anything else in the Dirac program.
Next set the CBIV-A crossovers with 12 dB slope (so that the CBIV 12 dB slope combined with the Dirac target curve 12 dB slope = 24 dB slope combined) as indicated by the Dirac measurements. Next set the speaker delays, adding 12 ms for subwoofer group delay). Next upload the Dirac filter to the CBIV-A. Next play a CD on infinite repeat and reset speaker levels based on the speaker crossovers, slopes and delays that you have set. Follow the procedure outlined in the Theta CBIV manual (and of course add the “top” speakers), setting speaker levels using the CBIV-A’s internal test tones to 70 dB, and setting the subwoofer’s internal amplifier level to 76 dB (if using analog Radio Shack sound level meter which needs correction for subwoofer test tone compared to other speaker level test tones). And of course, this is a starting point, you may want to set subwoofer “hotter” with a higher level than other speakers – your subjective opinion on this is what counts. Once you’ve set speaker levels post-Dirac, only then do you enter your source inputs, delays, etc.