Vibration Source?


Hello Goners. I haven't been able to find any discussions that address this topic, so here goes: As you go up the fidelity chain, in terms of resolution, do any of you encounter vibrations coming from the speakers that seem to be in the recordings themselves? I have a CD only system, and I detect vibrations in about one in ten or so CDs (usually old ones,) but only on certain tracks. The vibrations come from different speakers, depending on the track, but usually in the mid range. The vibrations on any given track sound to be tied to a specific instrument in every case. For example, in a clean electric guitar part, it's as if the vibration is coming from the guitar amp that was used to make the track, not from an issue with my speaker. However the problem pops up with piano and acoustic bass as well. If I put the same CD in my stock car system, it comes across as low level noise, not vibrations. But I rarely seem to encounter any low level white noise at home, only vibrations coming from specific instruments in a track.  Thanks for your insights.
barnegat666

Showing 2 responses by barnegat666

Basically, it sounds like a buzz coming from around the speakers. My first thought was that it was some part of the living room vibrating from a resonant frequency, as frequently happens in cars. Or, maybe the midrange drivers need to be replaced in the speakers. But on closer inspection it is definitely not the former. I can't pinpoint the exact source of the buzz on the speaker, so it seems as if it coming from inside the sound field, aka the recording. I've never heard anyone talk of this issue, so I'm confused. The main thing is that it could be either side of the stereo image and always comes from one specific instrument in a recording. The buzz is faint and is imperceptible during louder passages of music (on a track where it even occurs at all.) Do I need to hire someone with "golden ears" to come by and tell me what the problem is?
     Thanks for the responses so far. I'll try to come with a list of songs that I notice the problem on. One I can think of off the top of my head is Steve Earl's "Goodbye" from the album Train a Comin'. It sounds like a buzz is coming from the right speaker in the midrange that is associated with the acoustic bass. If any of you play guitar or bass, think of an unwanted rattle or amp noise coming from the cabinet that the amplifier drives.
     I guess it might help some of you if I tell you what my system is. I consider it to be pretty revealing, but I haven't heard the "super systems," so maybe it's not. The room is large: 26' wide x 15' deep with a ceiling that is 14' on the sides and 18' in the middle. The speakers are along the long axis, 2.5' from the back wall. They are 8' apart and the listener position is 10' back.

     CD player:  Krell KPS 20i.
     DAC:          Audio Research DAC 3 (I just started playing with tubes.)
     Preamp:     Krell KRC HR.
     Amp:          Krell KSA 200s.
     Speakers:  Thiel CS 7.
     Cables:      All cable is Transparent Audio Ultra mm2. (except the                               digital cable.)

     The speakers are 4 ohm nominal, so the amp runs at 400w per channel. The speakers could ideally use even more power, but that's a very minor issue.