If I were you, I'd start from square 1....make sure the cartridge suspension and stylus is ok. I'd send it back to Lyra for a checkup. They probably won'r even charge you to look at it. The Atlas is one of my favorite cartridges....I've heard it in V with a high end system with powerful low end and no woofer pumping.
Why are my woofers pumping?
The other day, with sunlight direct from the side, I noticed that the
woofers in my speakers are pumping in and out, much more than I was aware of,
when the stylus is in the groove, even between tracks (no music). I can see it, even if I don’t hear it. Why
does it happen? The woofers behave normally (no pumping) with digital music, and
when the stylus it lifted from the groove, so it is not the speakers, amps,
preamp or phono stage.
I’ve read that the typical reason for woofer pumping is that the cartridge / arm resonance is too low. I tested, with my Hifi News test record, and yes, the lateral test puts the resonance at 7 hz or so – too low (but I’ve seen some doubts about the results from that test record). It is strange, since the combo I use – Lyra Atlas cartridge and SME V arm (on a Hanss T-30 player) is supposed to work well. I tried to strip my arm of extras, cleaned the damping trough, etc – but it did not help much.
Anyone has an idea, why it happens, or what to do about it?
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- 185 posts total
>>>>>> I can see it, even if I don’t hear it. Why
does it happen? The woofers behave normally (no pumping) with digital music, and
when the stylus it lifted from the groove, so it is not the speakers, amps,
preamp or phono stage.
<<<<<< In the day of phono only they had a button sometimes labeled "Rumble filter." That's what you got. Others may say "Low filter." Interaction between the cartridge, tonearm and record cause ir. |
Does your turntable have an attached cover? If yes, it catches low frequency audio like a sail catches wind. See if removing it reduces the feedback. If yes but you still want to keep the cover attached, rotate it perpendicular to the speakers to at least reduce the pickup. Worked for me! Just a thought. - Andy |
Whatever you do, don’t get a subsonic filter, unless of course you want to kill good sound.This is nonsense. I use the cheap DB Systems filters and the loss in fidelity is barely perceptible. I also discovered that, indeed, "silent" record grooves are not the same. You discovered that subsonic noise is often cut into the grooves. This is why you're not getting pumping in the runout grooves. I once believed warps were the major culprit. They’re not. It’s usually acoustic feedback and poor album cuts Read some of the reviews on these: http://store.acousticsounds.com/d/60042/DB_Systems-DB_Systems_Subsonic_Filter-Turntable_Accessories At only $20, it can’t hurt to try them. If you like the result, consider investing in the DB-12 or KAB filter. |
- 185 posts total