SAM 2

[ogs]

As posted elsewhere, I have struggled a bit with REW.  After a bit of effort and hassle and frustration this morning, I have finally got it to run without the various error messages I obtained previously.  As my main issue at the moment is with SAM 2, I thought I'd try a few checks at different SAM % and SAM off.  I wouldn't read too much into these curves, I couldn't get the mic into the correct listening position.  (I have lent someone my USB extension cable that I would need for this), plus these are the first runs I've obtained with REW, and I think I still need to do a bit of fine tuning with REW.  Anyway, see the screen grab attached, it does show something interesting.  (I've just shown the bass end of the response curve, the rest is very dull, but nicely flat) The purple line at the top is with SAM 100%, the lower green line is SAM off, the reddish purple and vomit coloured lines in the middle are SAM 50% and 40% respectively.

I need to spend some more time fine tuning REW and experimenting a bit, however, what this graph appears to show is that with SAM 100% the level of the very lowest bass is actually increasing significantly exactly where you would expect it to be tailing off to nothing.  Assuming these graphs are reasonably indicative of reality, it's no wonder I am preferring SAM% wound down to at least 40%.  I need to spend some more time with this.  (but not today, about to start wasting many hours watching F1 at Monza)

Another conclusion I have reached is that I should perhaps spend a little time looking into room treatments, I think I need it!  (my room does have a nice carpet, sofa and other soft things, but it is rectangular, has walls, a ceiling, corners and other awkward things)

Hi Confused

interesting measurements there! I can well understand you prefer 40-50%
I do not use any room treatment, but I use room correction. With 7.1.3 and SAM for the Atohm GT1 enabled at 100% (this will be the old SAM). I guess 100% is a little too much here too, but Audiolense creates a very nice correction on top of this. The result is very very good. I've got a prominent standing wave in my room at 47Hz which is nicely controlled by Audiolense.
I plan to test 8.1.3. As SAM will be v2 with 8.1.3 I'll have to do a new measurement with Audiolense. I am in no hurry to do this as SQ is so good at the moment.