Oldhvymec, There is LOADS of low frequency "noise" on vinyl that has nothing to do with the music. I have several recently pressed records that were obviously done on a poorly maintained lathe as the records have some of the worse rumble I have ever heard. The first time this happened I though my bearing went bad.
Many subwoofer systems start rolling off at 30-35 hz by 18 Hz they are perhaps 6 dB down and that is only one octave. My system also doubles for theater work and there is loads of bass down there. Just watch Ford vs Ferrari.
Rumble can be very low down as are surface irregularities on the vinyl. I use a digital high pass filter that rolls off at 100 dB/oct starting at 18 Hz.
If I defeat it the woofers will start flapping from just vinyl irregularities wasting power and taking the subwoofer drivers out of the linear part of their excursion causing distortion. Remember you have a resonance frequency between 8 and 12 Hz if you set up your tonearm correctly so these frequencies are amplified. Unfortunately, Records are not perfectly flat. You will see woofer movement in any system plating vinyl usually fairly mild as most system do not do much below 30 Hz although there are plenty of threads about flapping woofers. With modern subwoofers, amplifiers that go right down to DC and room control this can become a huge problem. Most Room control units, at least the ones I am familiar with allow you to design filters which if you play vinyl is for all intents and purposes mandatory.
Many subwoofer systems start rolling off at 30-35 hz by 18 Hz they are perhaps 6 dB down and that is only one octave. My system also doubles for theater work and there is loads of bass down there. Just watch Ford vs Ferrari.
Rumble can be very low down as are surface irregularities on the vinyl. I use a digital high pass filter that rolls off at 100 dB/oct starting at 18 Hz.
If I defeat it the woofers will start flapping from just vinyl irregularities wasting power and taking the subwoofer drivers out of the linear part of their excursion causing distortion. Remember you have a resonance frequency between 8 and 12 Hz if you set up your tonearm correctly so these frequencies are amplified. Unfortunately, Records are not perfectly flat. You will see woofer movement in any system plating vinyl usually fairly mild as most system do not do much below 30 Hz although there are plenty of threads about flapping woofers. With modern subwoofers, amplifiers that go right down to DC and room control this can become a huge problem. Most Room control units, at least the ones I am familiar with allow you to design filters which if you play vinyl is for all intents and purposes mandatory.