![subsonic filter subsonic filter](https://img.ricardostatic.ch/t_1000x750/pl/1055191720/0/1/nakamichi-sf-10-subsonic-filter.jpg)
(0, 10:44)David A Wrote: I tried using the subsonic filter for a while but went back to not using it. Maybe you could sell your 'problem' to Devialet to be used as a sales pitch Of course it could just have been made up by an advertising company. It turned out that it was a train or subway that was close to the recording studio at the time of the recording. There was a story going around at the time that Philips introduced the CD that they had made a recording that had some sort of rumble that they couldn't quite identify. This very likely went unnoticed in the studio, with normal speaker low frequency roll off, but with SAM pushing subsonic stuff to virtually flat / zero roll off, then the effect is exacerbated and becomes very apparent. Not from my turntable, this is a CD rip, but from one of the turntables used to actually perform the track in the first place. Thinking about this today, I'm wondering if this is exactly what it is. I said in my original post that it looks like the kind of environmental feedback that you get with vinyl. does it come with a rhythm or is it random) Have you tried listening through headphones? Is it part of the music? (i.e. It would be interesting to know what creates the low frequency noises on your track Confused. (1, 21:43)Confused Wrote: (1, 14:00)Pim van Vliet Wrote: With my Dynaudio C1's, and SAM on, the bass drops off when I turn it up too loud so it must be the protection part of SAM that does that. I always thought redbook CD was limited to 20hz? My last question, I am sure these cone movements are somewhere in the 10 to 20hz range. After all, it does not make sense to compromise 99% of ones listening, just to prevent a minor issue with one or two specific tracks. However, I do wonder if there are any negative to using the subsonic filter. I am thinking of trying this, to see if it tames the unwanted (and slightly alarming) low frequency cone movements that SAM + tacks like "Hell is Around the Corner" can produce. I am aware that it is possible to enable a "Subsonic filter" in the general settings section of the configurator. Is it just the SAM / Blade combo that is upset by this track, does it impact some other speakers, large or small? I am curious!Īs a second question. Firstly, it would be interesting if other users with SAM enabled systems could try this track. It is hard to judge, but I would say the cone movement is below the 20hz / audible range. This is the kind of cone movement you can sometime see using vinyl due to environmental feedback if a subsonic filter is not used. (CD rip, AIR Ethernet) In addition to sounding a little odd in the very lowest bass with SAM enabled, parts of the track with SAM on produce very large, slow, cone movements. Tricky's "Hell is Around the Corner" (Maxinquaye). I will be leaving the speakers in this position for a while to see how everything sounds after some more prolonged listening.īut there was one track. After much experimentation, I found that actually a 3" (75mm) shift was enough to tame the bass issues, whilst giving a much better overall balance to the sound than was apparent from the 10" (250mm) shift. Plus, almost as proof of concept, the majority of the "rouge" tracks either no longer displayed any of these negative bass artefacts, or at least, the effects were reduced to the point that they were no longer of any real concern. The result? Well moving the speakers away from the wall did change the overall balance toward the "lean" end of the scale.
#Subsonic filter full
With this complete, I positioned the speakers a full 10" (250mm) further away from the wall, an the listened through the playlist of tracks with rouge bass. Today I spent some time trying to tidy up the cabling of my system, and to facilitate this I had moved the speakers. The idea being that when I had a few of these tracks compiled, I could experiment with speaker positioning, to see what effect it would have on these particular tracks. For while, if I ever listened to a track that I felt was producing some sort of bass artefact, or if the bass was simply extremely overblown in some way, I placed the subject track into a playlist. I had a theory that these seemingly negative effects of SAM could be eliminated by adjusting the speaker positioning. These are very low frequency "puffs" of other not very musical low bass effects. Since getting SAM for the KEF Blades, have noticed the very occasional track that sounds a little strange with SAM, or displays some kind of "bass artefact", for want of a better term. I did consider posting this in the "effects of SAM" thread, but though on balance it deserved a new thread.