ANOTHER series of mat/clamp comparisons.

[Balle Clorin]

Thinking about how a doctor use liquid gel when doing ultrasonic imaging. The gel transmit the vibration in both direction by a tight coupling minimising the skin interface disturbance. So a the interface matters , but it is not clear for me if the interface should be closer to the record properties or platter properties.. should it absorb the vinyl vibrations or transmit them, I think maybe the last.. when wil someone try liquid gel under their record

It seems like most rubber mats are made to damp and isolate motor and chassis/bearing noise from reaching the vinyl/cartridge, and not care about vibrations in the record caused by the stylus

 

[spiritofmusic]

Thinking about how a doctor use liquid gel when doing ultrasonic imaging. The gel transmit the vibration in both direction by a tight coupling minimising the skin interface disturbance. So a the interface matters , but it is not clear for me if the interface should be closer to the record properties or platter properties.. should it absorb the vinyl vibrations or transmit them, I think maybe the last.. when wil someone try liquid gel under their record

It seems like most rubber mats are made to damp and isolate motor and chassis/bearing noise from reaching the vinyl/cartridge, and not care about vibrations in the record caused by the stylus

Comparison of soft mat (Stack) versus hard mat (Spec) should be very interesting.
Right now, I cannot identify one area that the Stack is poor at or identifies it's in the system.
The very definition of neutral and transparent.

 

[mtemur]

Thinking about how a doctor use liquid gel when doing ultrasonic imaging. The gel transmit the vibration in both direction by a tight coupling minimising the skin interface disturbance. So a the interface matters , but it is not clear for me if the interface should be closer to the record properties or platter properties.. should it absorb the vinyl vibrations or transmit them, I think maybe the last.. when wil someone try liquid gel under their record

It seems like most rubber mats are made to damp and isolate motor and chassis/bearing noise from reaching the vinyl/cartridge, and not care about vibrations in the record caused by the stylus

In ultrasonic imaging the operator uses a gel specifically to eliminate the air gap. The gel provides a denser transmission medium with acoustic impedance very close to that of human tissue, allowing ultrasound waves to pass efficiently into the body.

Ultrasound requires transmission of sound through the medium.

With turntables, we want the exact opposite. We don’t want vibration passing from the platter into the record. The goal is to block transmission, not facilitate it. Isolating is the key word, not damping but isolating because when you damp you probably absorb the vibration generated by the stylus. It’s the sound carved in the grooves, which we want to keep. So the principles are fundamentally reversed.

 

[Balle Clorin]

My point of concern was not vibrations from the sourroundings to the record, but the vibrations in the vinyl record generated from the stylus., ie reflections caused from that and muddying the reproduction from the grooves.

It is clear that if vibrations can travel from the record to the platter, the opposite will happen too, but what is the worst problem? It has always been focus on the path from sourroundings to as they has been regarded as the main problem, maybe correctly, I am just wondering .If we prevent vibrations from platter to record we would also prevent vibrations from record to platter, which may not be desirable. …
4 different rubber and sorbothane mat has had no difference in impact of my ruble/ motor noise. It seem that the noise is coming from TT to stylus regardless of mat or not, which is not the conventional wisdom. All Hifi News test show reduced rumble with a rubber mat.

If we isolate and limit the path from platter to record, will not that not have a side effect of making the vibration on the record worse? That is we’re I am curious,Maybe I am just going is circles in my private rabbit hole..