21-May-2015, 09:20
(21-May-2015, 08:32)Sylvain27 Wrote:(21-May-2015, 00:13)Saint0 Wrote:I made a test : I converted the lossless flac file into MP3 (Gavotte in D by Jacques Loussier). Even with MP3 file, SAM can be seen without problem.(20-May-2015, 09:01)Sylvain27 Wrote:Thanks, I'll try that one out. I used Massive Attack's "Angel" to check SAM On/Off before, which is the reference track on the Scala V1 SAM webpage.(20-May-2015, 05:58)Saint0 Wrote:Well, I am quite surprised. On the video, the tune played is track 4 of this album http://www.qobuz.com/fr-fr/album/jacques...qref=dac_7 (Gavotte in D major). I just tried at -20 dB the beginning of the track, SAM ON/OFF is obvious, the woofers move much more with SAM ON (100%) and if I reduce SAM %, movements of the woofer are smaller (subsonic filter OFF, I did no try with ON). I know that there is a big woofer on the Scala and 2 smaller woofers on the Diva, but B&W 802D has a big woofer too. I remember that someone who have a pair of Focal Diablo (one of the first speaker SAMed by Devialet) noticed these big movements too. What source are you using?(19-May-2015, 16:23)Sylvain27 Wrote: Hello, I have older Focal Utopia speakers, a pair of Diva. Devialet borrowed my own pair to be SAMed, so I hope the correction is the right one! I have a similar experience, SAM does not change completely the bass, and I think it's because we have speakers with already a good bass response without SAM. However if you look at the boomers while playing double bass for instance, SAM correction can be seen immediately at times, movements of the speakers' membrane have a much larger amplitude with SAM.
Best regards,
Sylvain
Thanks for the feedback Sylvian.
I've seen video's of other SAM'd speakers, like the B&W 802D, on YouTube. It looks like some kind of subsonic vibrations with SAM. Deviate's site claims 10mm excursion for the Scala V1 with SAM, (I thought it used to be 17mm with SAM 1.0 ??). I was hoping to see some visible evidence of SAM in action, but my Scala's woofers don't seem to move in & out with SAM like the others. I've tried it with Subsonic Filter On & Off, but I've not noticed any major visible difference in the woofer's behavior with or without SAM. I usually set the volume at -33dB to -20dB max, may be I'm not playing them loud enough?
Hi Sylvian - I tried the Jacques Loussier Trio Bach Gavotte, and I've finally seen SAM in action with the Scala at the beginning of the track. The large low frequency excursions only happened briefly in a couple of sustained double-bass passages. Most of the time there's no noticeable changes, visually or in SQ. The Scala's woofers just don't move in & out that much, pretty well damped. It's probably a good sign that the Devialet is having iron-grip control of the woofers. Thanks for introducing me to a nice SAM test track.
I remember back in the day, my early college stereo, playing vinyls, I noticed the woofers of my speakers tend to move in & out all the time either from some kind of ultra-low frequency subsonic noise or the amp was getting sloppy, certain not because of SAM!
As you've mentioned, I didn't noticed much change in the bass with SAM. The most obvious difference with SAM is the slightly expanded sound stage in my experience; and SAM 2.0 is even more subtle than 1.0. Maybe my hearing range has diminished at the low & upper end with old age.