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In Reply to: RE: Some insight needed for points/footers. posted by pc123v on December 11, 2014 at 08:11:48
IME, the Iso-Cup without a ball is problematic since the flimsy wall of the cup-shaped opening affects the firmer functionality of the compliant material as intended. If a set of hardballs are undesirable, a set of Herbie's Audio Lab Gabon Ebony Domes can be secured to the bottom of a component or platform and placed within a set of Iso-Cups, such as for a more secure interface on the horizontal plane via domes vs. balls or for system tuning purposes.
Herbie's Audio Lab Iso-Cup with hardball footer combines both coupling (hardball) and decoupling (compliant base). The Iso-Cup with hardball footer is generally appreciated most when placed directly under a power amplifier, but I also use it under a laminated bamboo platform that supports an outboard preamplifier power supply to good effect. The stock feet of the power supply are replaced with a set of thick non-compliant carbon fiber composite discs adhered with RTV silicon to the bottom of the power supply unit. Additionally, a very thin low-compliance (firm) Herbie's Audio Lab Thin grungebuster Dot is adhered to the bottom of each carbon fiber disc to help mitigate inter-surface microphonics while offering minimal compliance, since the high-compliance of the Iso-Cup base provides a more effective decoupling layer. Furthermore, implementing more than one high-compliance layer within a stacked multi-layer vibration control platform tends to be counter-productive, since the function of a high-compliance footer/pad depends on two opposing rigid surfaces in order for the compliance of the footer/pad to work efficiently. YMMV
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"inter-surface microphonics" - that's not one I've heard of before. Care to explain what that is? Thanks.
In this case, 30mm W x 10mm H carbon fiber composite discs with Thin grungebuster Dots are directly adhered to the bottom of the PSU enclosure, which is then placed on a laminated bamboo board supported by a set of four Herbie's Audio Lab Iso-Cup footers. The effectively pointed hardball does well to couple resonance from the board onto/into the compliant Iso-Cup decoupling base placed between the laminated bamboo vibration control platform and the rack shelf surface. However, the carbon fiber discs placed on the vibration control platform without a thin decoupling layer creates a poorly coupled interface, which is prone to mechanical ringing (microphonics) due to the hard flat surface of the carbon fiber discs resonating against the hard flat surface of the laminated bamboo board. The very firm, minimally compliant Thin grungebuster Dots placed between the bottom of the carbon fiber discs and the vibration control platform surface avoids this resonance issue without adding the detrimental effect of an additional highly compliant layer within the particular multi-layer vibration control platform configuration.
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