I originally started this thread just to get some feedback on MY measurements - I'm very glad to see that it may be continuing on indeffinitely helping others with REW! It's great to see Amir and GIK helping out us less educated with this sometimes hard to understand information. Thanks guys!
Here are some guidelines for posting graphs:The preferred axis for ALL subwoofer graphs is:
VERTICAL = 45dB-105dB
HORIZONTAL = 25Hz-120Hz.
The preferred axis for full range graphs is:
VERTICAL = 45dB-105dB
HORIZONTAL = 25Hz-25,000Hz.
For subwoofer Waterfall graphs:
- Time range should initially be set to 300ms, never more than 600ms
- Lower limit should be set just above the noise floor in your room, typically around 45-50db - anything below this is useless background noise
I posted this in the REW/USB/HDMI Setup thread, but it moves so fast, I think it's getting lost. I thought re-posting in it's own thread might get me a better response. Thanks in advance for any insight!
OK, I got some good measurements last night after pushing subs around my room for about and hour and a half.
I've got 3 subs - 2 new, 1 older that is mismatched - and the placement combinations are seemingly endless! Anyway, I think I've got the bass response as good as it's gonna get without treatment (in the plans).
These measurements were taken with my UMM-6 and legacy audio connections (PC audio out to AVR). I've still got a small ground loop hum at 60hz that I need to hunt down and kill though.
Here's my graphs:
Subs + L/R, Audyssey OFF:
Subs + L/R, Audyssey ON:
Subs + L/R, Audyssey ON/OFF overlayed:
Subs + L/R, Audyssey OFF, full range sweep:
Subs + L/R, Audyssey ON, full range sweep:
Subs + L/R, Audyssey ON/OFF, full range sweep, overlayed:
Subs + L/R Waterfall, Audyssey OFF:
Subs + L/R Waterfall, Audyssey ON:
Drawing of my room with current sub placement:
Alan P2.zip 1751k .zip file
The sub response to me looks really good with Audyssey off, but after it's turned on there is some weirdness going on above the crossover point (80hz). Audyssey did however flatten it out nicely between 30-60hz.
On the full range sweeps, Audyssey created a big dip between 90-170hz. This is the "meat" of the mid-bass, correct?
Waterfalls are set to 600ms to get the last of the decay - looks not too bad to me, but what do I know.
After I took these measurements, I had a listen to some demo material I'm familiar with (Audyssey on) and the (for lack of a better word) "richness" was lacking - bass was almost non-existent. Checking the speaker levels in my AVR with the SPL meter in REW showed them to be quite a bit under 75db. Some were off by just a couple db, but the subs were down a good 10-11db. This has been my experience every time I run Audyssey on this system in my room though, so no surprise there.
I wrote down the speaker levels set by Audyssey, then adjusted the FL/FR and subs to as close to 75db (per REW's SPL meter) as I could. WOW! The sound really got "rich" after this - much more bass and mid-bass. I know, I'm gonna go to Audyssey Hell for this, but whatever it takes to make me smile I guess. Listening to the same demo material again did most certainly bring a smile to my face. I stayed up way too late enjoying the audio goodness!
I have not taken measurements after adjusting the speaker levels, but plan on doing that tonight.
Too anyone reading this, I can't stress enough the importance of experimenting with sub placement - especially if you have multiple and/or mis-matched subs. The inter-reaction between them is key to getting good sound. I'm stunned by how just moving one sub from the front to the back of the room made a world of difference. I also gain matched
(thanks Craig!) these subs for the first time last night (was always level matching before) and I think this may have greatly contributed to the results I'm getting.
Thanks to you guys for all your helpful input!