If the arm-cart system is ringing in response to those things, and you stick in a subsonic filter in the signal chain, the mechanical ringing is still going on, it's going to have sidebands up in the audible range that you aren't going to be filtering, and if its really bad, you can have wow and flutter-like pitch effects. None of those are going to be effected by isolation.Ī subsonic filter can't actually solve any of those problems.
#Subsonic filter diy plus
Plus there can be cutter head rumble embedding in the recording itself. Motor vibration can be another source of rumble (it's almost always a source of noise in turntables where the motor and arm are coupled to the same surface, just not always subsonic noise).
Record surfaces aren't smooth and polished, they contain irregularities that set off movement at subsonic frequencies, and according to the famous B&K study from the '70s, " Audible Effects of Mechanical Resonances in Turntables," the vinyl can produced subsonic noise in the 5 or 8 Hz range or something, which of course can excite an arm-cart resonance. More often it's the result of underdamped ringing of the arm-cart mass-spring resonance set in motion by the vinyl itself, and is best reduced first and foremost, mechanically. I hate to say it but the only way I know of right now is to go out and buy a complete EQ system that offers low cut at 16hz! Just to get the cut!Ĭlick to expand.Subsonic noise isn't typically caused by poor isolation - though obviously footfalls and such are subsonic environmental things that can excite subsonic ring in the arm-cart. Sonic degradation from filters that over reach and have deleterious effects on the musical part of the signal. Again when playing records there isn't any pumping so I don't want nor need any subsonic filter to degrade the sound here. My control room monitors have 8" desktop M&K subs and LS3/5 British monitors. None of the subs exhibit pumping so the only thing the KAB does is help with warps and poorly cut records that have loud rumble. I have four subs in this room which is my perfectionist listening room. Upstairs I have the KAB which I leave OFF because it blurs the separation too much. I use these subsonic filters on a far field monitor rig in the "big" room that features a couple thousand watts RMS and commercial 15" bass bins. I have a bunch of outboard EQs (Furman Q-152) in my recording studio that feature low cuts at 16hz and below which is ideal. You may even lose some of the guts in male vocals at 150hz! What folks don't realize is that when you read that a filter cuts at 40hz and down it really will effect notes well ABOVE the stated cutoff as the subsonic filter cuts into higher frequencies to a certain degree. What you need is a subsonic filter that starts at about 20hz and cuts off below that. Great question as I too have noticed the side effects of the KAB system and never use it unless things are out of hand. However, the SQ from removing the KAB is so overwhelmingly positive aside from that, I'll never go back to using it.Īny ideas on a subsonic/rumble filter which does *not* affect the sound in any way?
The negative side effect of removing the KAB RF-1 is the bass does not have as much slam and precision as it once did. The only guess I can make is my previous system wasn't revealing enough to show the difference. I was completely taken by surprise, to say the least. Well, once I did, the channel imbalance problem immediately went away! Not only that, but my system sounds MUCH better! Was not expecting the slightest of changes but it's like finally hearing what my system is fully capable of for the very first time. However, I never once removed the KAB to see what it could sound like without it. When I first bought it, my system was on the low-end and has had each component upgraded to much higher-end gear. While troubleshooting a channel imbalance issue, I opted to remove the KAB RF-1 which I had in my system for a couple of years.
0 kommentar(er)
