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Low Frequency Rumble Question

I have a Linn LP12/Ekos/van den hul black beauty analog front end. When I play records from my collection, it is very quiet.

I have recently purchased some reissues of famous RCA recordings from Classic Records (all classical music) that appear on Harry Pearson's "super disc" list. In playing some, but not all, of these records, there is a fairly loud, low frequency "rumble" type noise in some fairly lenghty passages. It never lasts the whole disc, but is very pronounced when it occurs, almost like a low frequency "feedback" sound. This does not occur on my other records.

Has anyone had such a problem with any of the Classic Records reissues?? Could it be a problem with my system? - arm/catridge resonance problem perhaps? Any ideas on why it does this on only a few records?? Thanks for any thoughts.
jackcob
joeabrams
132 posts
 
Based on yr description, it may be feedback brought on by subsonic content in THOSE recordings. One way to test this theory is to listen on headphones with the speakers silent-- if your system can do that -- to see if the problem goes away. If it does, then you need to do a better job of isolating the turntable from acoustic vibration.
Best of luck,
Joe
rcprince
3,079 posts
 
Many of the RCA records recorded in England (for example, the Faust/Carmen or Royal Ballet Gala records), like their Decca counterparts, have glorious reproduction of the London Underground going by under the hall in which the recording took place; the Heifetz recordings often have a low frequency content that may be someone moving around on the podium(?)--for example, the Bruch Scottish Fantasy. On my Shaded Dog of the latter there is no problem, but Classic's records have much better bass extension, which in many cases is a mixed blessing. That may be what you're hearing, assuming your speakers can get into those nether reaches. Ah, wish my pre had a rumble filter!
detlof
1,899 posts
 
Both Joe and Rcprince are right on the dot! You can even discern very nicely which way "the tube" is going!
Cheers,
jackcob OP
37 posts
 
Thanks for the responses. I checked last night and I can hear the "rumble" through headphones with no sound coming through the speakers. So it seems it must be coming either from the recordings or from some problem with the arm/cartridge combo (ekos/vdh black beauty).

The "rumble" sound is so pronounced, it is hard to believe that it is on the discs themselves. Could it be a "resonance" problem, whatever that means?
jimbo3
304 posts
 
Seeing that the problem occured only on a couple of albums, I would tend to think that it is those albums that are the problem. However, you may want to clean/inspect/re-lube the main bearing on the Linn.

A resonance problem would possibly manifest itself by mis-tracking. Mis-tracking might be apparent either sonically or actually seeing the arm jumping around excitedly or both.

Take a look and let us know...

Regards
Jim
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