Originally Posted by AustinJerry
I don't see why you are frustrated. My observations:
- REW technique looks pretty good
- Measurement levels are too high (107 dB)
- How did you take the noise floor measurement? It seems low.
- “Average” is not a useful measurement.
- Strange peak in bass 40-65Hz--any idea what is causing that?
- Waterfall looks good
- ETC shows a bad reflection at ~7ft for LCR speakers
- In general, the response curves look quite good for not having REQ active. Except for that issue in the low frequencies.
I'm frustrated with how wavy the SPL curve is compared to the limited manual PEQ settings, and how the high frequencies are dropping off early even though I'm trying to EQ using 'flat' instead of 'natural'. The Polk RM1000W is part of an old Polk 3-piece RM3000 surround system which came with two small satellites. The satellite surround material disintegrated years ago and I kept the RM1000W in storage. When my Velodyne died with parts no longer available, I put the RM1000W back into service until I decided on a replacement sub. I plan to replace it with a SVS PB-1000 this month.
- How did you take the noise floor measurement? It seems low. [I turned off the power to everything which I could hear; I turned off the breaker for the refrigerator, turned off the thermostat, moved a clock into another room so I didn't have to hear it tick, closed all doors, turned off the projector, closed curtains, etc.]
- Measurement levels are too high (107 dB) [The noise floor was around 40-45, but with the 'normal' things on (A/C randomly kicking on, projector fan noise, refrigerator randomly kicking on, outside noises, etc,) the normal noise floor can be anywhere between 50-60dB depending upon what happens to be running. With a recommendation to have peak volume 40dB over the noise floor, I inferred it to be 40dB over the normal noise floor, not the absolute lowest noise floor. So I set the pink noise measurement (p60 in your guide) to be 55'ish+40=95dB. I didn't intend for it to be above 95dB.]
- Strange peak in bass 40-65Hz--any idea what is causing that? [No idea, suggestions on how to isolate it? May not be worthwhile to chase it with the pending sub change.]
- Waterfall looks good [Guide says waterfall measurements need to be a combo L+R+Sub to check modal, do I not need to worry about that? ]
- ETC shows a bad reflection at ~7ft for LCR speakers [MLP is 9.5' from LCR tweeters, there's nothing directly between MLP and tweeters. The mixed use room is only 13' x 15' x 8'. The center channel speaker is angled down to aim at the MLP, side walls are slightly under 7' from the middle of the C tweeter. Each LR tweeter is ~42" from the side wall. Not sure what's at the end of that 7'.]
So I'll take two more sets of measurements, one with room correction and one without: 85dB pink noise level instead of 95dB, only L/C/R/Sub, right?