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It is a possible LF tone arm resonance with the arm and cartridge pair. You can check the cartridge compliance and arm mass to see if that is the problem. There are charts that show compatibility.A high pass rumble filter can deal with that problem if that is the cause.
This is the subsonic filter that we bought and it works to get rid of the woofer slap. Read all the positive reviews.https://store.acousticsounds.com/d/60042/DB_Systems-DB_Systems_Subsonic_Filter-Turntable_Accessories
Hey! Yes, likely the cart/arm resonance is the culprit. My pre have rumble filter which I can't turn off so when I set up cart I use Hi-Fi News test record with vertical and horizontal resonance test tracks to check arm/cart resonance. Luckily so far all the carts I've use tend to fall on the acceptable range. Anyway, out of curiosity... Charles/rollo, what cart you had on that arm before the Ortofon M2 Bronze?
Rollo, I have the same problem. It’s not a tonearm cartridge mismatch. It’s not the floors. You just need a Phono Pre with a bass filter. I have two turntables, a cd player and streamer. Each turntable has a new cartridge professionally installed. The woofers flap while using either turntable. My floors are thick concrete so the problem is not a bouncy floor. I also tested moving a turntable far away from the speakers and the issue remained. My main speakers are small standmounts with 5” woofers. But I also have several pairs of older speakers with larger woofers. When I connect those larger speakers there are no woofers oscilating. The small bookshelves are super sensitive to vinyl irregularities. Each record has more or less or zero woofer flapping. When I switched to a Phono Pre with a bass filter the problem went away. I’m currently using a Simaudio 110 which works well. But the Lehmann Black Cube Statement with its bass filter on works the best. Zero flapping. SUMMARYChange the Speakers or the Phono Pre
Audio Technia. The Ortofon and the Kuzma Stogi S VTA arm is a VG match. charles
If it helps, here’s a way to think about it: MOST of the time, extra woofer excursions are not indicative of a real equipment problem upstream. It is usually the cart/arm system actually trying to respond accurately to real mechanical information at the record surface. Below about 5-10 Hz this info is not actual audio signal but is instead unwanted sub-sonic “noise” from record surface warps. Some may not be very visible to the eye but become more so when “read” out through woofer motions. And large woofer motions have other unintended consequences of amplifier over-taxing or simply moving the woofer off of the center sweet spot where best audio performance happens or in the worst case bottoming out against the end of woofer travel.Filter it out and you’ll be pleased with more cart/arm combos...
