I am a Micro Seiki guy and that cartridge is a very nice match for the tonearm of the DD30.
There are two paths for acoustic feedback, structure borne, which means that the structure that you are putting the turntable on is inducing the feedback, usually through the floor, or airborne feedback which simply means that your turntable is too close to a speaker.
Let's take the first one first. What type of structure do you have your turntable on? If it is heavy, like a dresser or large shelving unit then a good experiement is to try it on a very light table, like a TV tray table and see if that helps. Likewise, you can try things like tennis balls cut in half for feet or even a partially inflated inner tube with a piece of plywood on top of it. KAB Acoustics also makes a low frequency filter - what we used to call a "rumble filter" that may work as well.
If it is airborne, you have but one solution and that is to move the turntable to a place where it is no longer excited by the loudspeakers.
There are two paths for acoustic feedback, structure borne, which means that the structure that you are putting the turntable on is inducing the feedback, usually through the floor, or airborne feedback which simply means that your turntable is too close to a speaker.
Let's take the first one first. What type of structure do you have your turntable on? If it is heavy, like a dresser or large shelving unit then a good experiement is to try it on a very light table, like a TV tray table and see if that helps. Likewise, you can try things like tennis balls cut in half for feet or even a partially inflated inner tube with a piece of plywood on top of it. KAB Acoustics also makes a low frequency filter - what we used to call a "rumble filter" that may work as well.
If it is airborne, you have but one solution and that is to move the turntable to a place where it is no longer excited by the loudspeakers.