Originally Posted by Kimwyn
I understand what you mean but my question remains, without measurements how can you tell what sounds like reference?????
Short answer: from having heard/listened to it in my room since the beginning of April.
Long answer: the first addition I ever did to my HT room was upgrading my single subwoofer to a DSP-3100 with Paradigm PBK. With PBK I was able to see a real time graph of how my subwoofer behaved in my room and the corrections that PBK did to achieve a reference curve. From this I knew that with a single subwoofer setup with the subwoofer in the front left corner, the sound coming from it was reference. I than added a second DSP-3100, but unfortunately PBK cannot EQ subs together (only individually). So individually, the second sub in the front right corner was almost reference (there was a dip around 80Hz that PBK could not fully correct to the reference curve but only by 2dB). I then added XT 32 into the loop back in September, which allowed me to cut PBK out of the equation and also allowed both subs to be EQ'ed together and work better together. Now, with my most recent subwoofer upgrades, plus my projector upgrade, and my seating upgrade, I finally have the opportunity to try different spots in the room to see if I can achieve better sound BEFORE running XT 32 (since physical adjustments before using EQ is the best route).
From this, I know what reference in the lower end sounds like, I know what to listen for. This is not some "spur of the moment" foray into subwoofer placement and I am not a newbie wondering what to listen for. I know what to listen for (without measuring gear) and I will be able to tell if the sound is better or worse when I try new positions. I merely created this thread to make sure I was doing the simple "sub crawl" method correctly for dual subs.
Interesting note: when I was running just a single sub back in April, I originally placed it in the front left corner using the sub crawl method and it wasn't until a few days later that I confirmed this was the best spot upfront using the PBK software. I was able to pick the best spot back in April when I was just starting out in this hobby using just my ears......so I have no hesitation that I can pick out the best spots using my ears again months later after becoming very familiar with my room and what reference sound should sound like. Just like, after a few years of having my TV's professionally calibrated, I can now view a TV and judge if the picture is close to reference or how far off it is (red push in skin tones, crushed blacks, picture to bright, etc). It's all learned knowledge which allows me to know what to look for in a picture and what to listen for in sound.