Why are my woofers pumping?
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?
Atmasphere - you may be right. But Lyra does not warn, and web debate does not complain, using the Atlas on the SME V - so i wonder.It might be that some of those debaters don't have the bottom end bandwidth in their systems that yours has. I went from the SME5 to the Triplanar and that helped get rid of that problem in my system. The SME5 seemed like it was a higher mass arm than the Triplanar. |
It is a long-term discussion - https://forum.audiogon.com/discussions/how-to-change-effective-mass-of-a-sme-v Atmasphere, isn’t your Triplanar arm mass higher than the SME V? I should get the arm mass down, to get the resonance frequency up - true? Increasing the arm mass is not difficult, decreasing it is the trick ;-) |
I agree with @atmasphere that cartridge compliance is almost certainly too high, although placing the turntable too close to your woofers may exacerbate the problem. Short of replacing the cartridge and/or counterweight, you might also see if you can lessen the problem with damping. You write that you "tried to strip my arm of extras, cleaned the damping trough," so it’s not clear that you’re using any damping at all. Is that correct? |
atmasphere It might be that some of those debaters don’t have the bottom end bandwidth in their systems that yours has.That’s possible. It’s also possible that the debaters have absolutely no experience with the arm, or with your arm/cartridge combo. There are many self-proclaimed vinyl "experts" on the web who have no idea what they’re talking about. |
