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In Reply to: Question for SUB-experts out there: posted by WSB on January 26, 2000 at 12:04:27:
... in just about all things audio!However, a couple of things spring to mind: there's a lot of room modes going on in the low frequencies, which makes it pretty tough to call without a lot more detail about your room. You may have a mode cancelling, or reinforcing, in one part of the room and not another.
Try putting your sub on a chair in your prime listening position, then walk around the room and find where the bass sounds the best. Then put the sub there, and put yourself back in the listening position. Quite a few times this will help you find the best position.
Don't be afraid to play around with positioning. In my listening room, moving the subs a couple of inches excites a room mode at 80Hz by something like 15dB.
The first thing I would do is reset the AVR or Pre-amp setting as someone might have DRC, LFE ATT, or Lvl screwed-up and to simplify details start from scratch. Second set your speakers (front large, center small, rears small, and sub yes/plus if you have the appropriate other Mission setups I think you have like their matching center and rears). Check all speaker wire connections because if any one speaker is firing out of phase and is in a bass enhanced section of the room mode could actually muffle the bass effect from the listening positioning. I don't know what sub-woofer cable you use but if you are not at least using a monster THX sub-cable (the lowest I recommend) then you might not get a good signal. While playing some music loud set the sub at middle of the gain setting (normally this is way too loud but is easier to set phase) and adjust the phase of your sub (if this is noticibly louder when you adjust phase then that is the correct setting). I don't know if you're an experienced hobbiest and I don't mean to insult you but if your sub's power cord is plugged into your AVR it's now time to give it it's own outlet (I am amazed at how many people plug a sub or amp to the low output accessory outlet of most AVRs as now the AVR and the sub now competes for current drawn from the bare-bones cord that comes with their AVR). Positioning the sub follow the person's advice who posted before me and in addition buy a cheap TV lazy-susan (Walmart for about $5) put about a 2' x 2' board on it, then your sub, and as music plays have someone turn the sub to find out what is the best firing facing for performance (you would be amazed how this tightens bass performance and well as enhance output by using the better room modes). You might have to also see if everything in that room is on the same circuit and how much power is being drawn from all items as well as maybe removing the sub from a line conditioner (though this tightens bass, it will sometimes effect dynamics and extension when the amp draws the most juice). If the sub is on a carpeted surface you might have to buy spikes to couple it to a more firm surface (wood or concrete). Worst case scenerio set all speakers to small and direct all bass to the sub as some gear will limit the signal to the sub if any speakers are set in the large setting. Can you do all of us a favor, list some of the other equipment in use AVR/pre-amp/amp, interconnects (namely sub, CD player, and DVD player avoid optical connections), line conditioners (if used), and potential room treatments (if used) as someone else on this site might can offer a better solution than I.
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