![]() It did make some difference, but didn't come close to eliminating the issue. I also added one of those 20Hz -12dB/Octave in-line RCA filters at the subwoofer. This shouldn't be a compliance issue with my Tonearm/Cartridge combo? I turned the volume up, and I could see the woofer flutter. I did an experiment where I turned the platter off and just rested the needed on an album. The entire bottom surface is resting directly on the floor. I definatly would recommend this product to some one that needed a simple subsonic filter. With a little tuning of my amp, the woofers sound nice and tight, without wasting energy amplifying sound that can't be heard anyway. The new Martin Logan Grotto i did not come with any floor spikes. Harrison labs subsonic filters do what they advertise. The entire thing is wrapped in very dark cloth. These are subsonic filters for phonos that do not go into a unit with that type of filter supplied. Also, it's VERY difficult to see the drivers with the Vandersteen sub. The first sub (Vandersteen V2W) never appeared to have issues, but that sub is decoupled (if that even matters) from the floor with spikes resting on brass disc. That really eliminated any audible rumble that I was having. I purchased a set of four Herbie's Tenderfeet, and used them in conjunction with a bamboo cutting board as a phono stand. My room has laminate flooring, and I was setting the Rega on a buffet which is where I store my albums). When I first got my TT, I had audible issues. They are designed to stop much of the excessive woofer movement when playing records. I think the final solution is going to need to be a combination of isolation and subsonic filtering. These are subsonic filters for phonos that do not go into a unit with that type of filter supplied. I have 4 tenderfoots under a bamboo cutting board, and then 4 more tenderfoots under the turntable. My turntable is isolated with two sets (8) of Herbies tenderfoots. At $180 I would much rather spend the money on a better phono preamp.Īdditional info : My turntable is a modified Rega RP1 w/Ortofon 2M Blue cartridge. If this thing was $50 it would be a no brainer. I wonder why the new ones are different?ģ) KAB RF1 - Strictly a subsonic filter. I was looking at some of Pro-Jects older products such as the Phono Box II SE and they were 18Hz with a 24dB/Octave attenuation. It starts at 20Hz and attenuates 12db/octave. I can't seem to find this info anywhere.Ģ) Pro-Ject Phono Box DS - Has a built in subsonic filter. ![]() I also don't know how steep the filter slope is. So far I've been able to come up with three options.ġ) Cambridge Audio Azur 651P - Has a built in subsonic filter, but I have no idea what frequency it starts to filter. My current Phono preamp is a Rega fono mini so my current line of thinking is to get an upgraded phono preamp that has a subsonic filter. I just picked up a second subwoofer for my system, and now I have the dreaded woofer pumping issue when playing Vinyl.
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