AVS Forum Special Member
Join Date: Feb 2000
Location: Tucson, AZ, Telluride, CO, & Los Angeles,CA, USA
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I was unable to electrically measure the pre-outs with my RTA. I will get a friend who has one that will do this, and has a 4806, do it for us.
This discussion of sub volume settings is interesting. What subs are you guys using?
This sounds like a gain structure issue. If you have had a THX certified sub, you have noticed that there is a THX position, and non-THX position. The THX position is volume full up, no filtering; the task is left to the controller/receiver to provide the filtering and gain setting. A benefit of THX that is not widely discussed is the designed gain structure. Starting back in the decoder on your receiver/controller's chip, and proceeding through to the speakers, THX certified products follow a specific gain structure so that a predictable (and target) reference SPL at the listening location will be achievable.
I wonder if the sensitivity of your subs (presumably non-THX) is such that full up on their volume puts the sub in the "odd man out" position of being too much for the receiver to handle. Either way, as Jase suggests, turn it down using incremental steps and try it out.
I'm using two Klipsch Ultra2 subs in acoustically nominal positions at a distance of about 6 feet, and the sub level lands at +1.5dB after auto cal.