I have arc ultra, era 300 as surrounds and brand new sub 4 (which replaced sub mini) . I had mixed feelings regarding sub 4, comparing to sub mini, so I tried frequency sweep with surrounds off. I found that sub 4 works perfectly at 30hz but then there is hole between 33- 45hz, there is almost no rumble (in fact sub drivers stop) Checked in some places in room (sub crawl etc), with on and off trueplay, with loudness off and on - there is always poor response between 33-45 hz. Sub rumbling at 30hz, the rumbling is gone and then at circa 45 returns….
To be clear: made multiple tests (after full factory reset, fresh advanced truplay calibration and after last update), and tested sub with stereo par of symfonisk bookshelf gen 2. Always there is hole around 35 - 45 with total lack of drivers response at part of frequency range (in music when cutoff frequency matters and in only LFE (dolby 5.1) sub frequency tests.
I understand that room geometry matters, and maybe truplay must be repeated, but- sub mini had no issues and sounded much better in my 23 square meters room:(
It’s my second attempt with sub 4, tried almost year ago, and returned because sounded inferior to mini. Thought that maybe Sonos made some software changes, but can’t see progress….
Maybe doing something wrong? Or maybe lack of working sub between 35hz and 45hz is normal?
Let’s say defective one (but for me second defective one :( ) Checked also sub mini in all similar tests. No issues at all. Bass starts at 20hz and its linear.
