2. analog
  3. 142242-3420

Why don't all phono preamps include a rumble filter?

In my system, the use of a rumble filter is mandatory (I notice no degradation of sonics when I engage the rumble filter).  I'm thinking of upgrading my phono preamp and would like to choose one that has this as an optional feature.  However, it appears that most manufacturers of phono preamps do not include this.  Why not?  Does the use of a rumble filter degrade the sound of a phono preamp?
louisl

Showing 2 responses by wlutke

wlutke
294 posts
 
louisl,
Have you inspected and lubricated the main bearing lately?  My HW-19 MK IV had no audible rumble at any volume.  The Technics in stock form may be more immune to feedback.  Could it be that you are referring to acoustic feedback as rumble?  As noted, there are solutions for that.
wlutke
294 posts
 
louisl,
You said "Also, isn’t acoustic feedback the same as rumble. If not, what’s the difference?"
I’ve always thought of rumble as something audible or inaudible (pumping) with the volume turned up, the table spinning with the needle down and no music playing, and acoustic feedback as an external excitation by the speakers.
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