EseLab

Multidimensional Audio (Henning Moller, Bruel & Kjaer)

Rega VTA by Roy Gandy
Exposing the VTA myth? By Geoff Husband

Behind the curtain Nibiru MC RIAA phono preamplifier additional information

The original idea that made me think about audio topology in a radicaly different way from the mainstream was the reading of The Be Yamamura Interview published 1996 on Cyberfi.

We obtained the first useful results in year 2000 and only a year ago we could say with confidence “This is it!”

The audio circuit is a break through in analog audio equipment as it is using a proprietary current domain class A circuit without capacitors in circuit and without any form of negative feedback applied. Low parts count, short signal path, the best possible components used, tight tollerances and very important layout design as well as consideration of every detail, even the ones considered irrisory and usualy overlooked, play a big role in complete outcome. It must be underlined that phono stages have to process and amplify the most tiny signals involved in a reproduction system. If we try to make a simple calculation it will be a lot easier to understand as to why it is so difficult to make an outstanding MC phono stage and why it is sensitive to mechanical vibrations trough coupling even extreme measures to prevent this are taken.

If we take an average MC cartridge with 0.5mV output on full modulation which is 10cm/s and pretend a good response on small signals such as hall reflections and other low levell information we must assure impeccable behaviour to at least 60dB lower, translated to voltage it is 0.0005mV! I can assure you that this is a realy tiny signal and should be treated as such. The other aspect that should be considered is the noise floor of the stage. If noise floor is not by a 20dB lower than the smallest signal we can not expect high quality low levell details.

The same consideration is to be done regarding the influence of structural and airborn vibrations on sound. We know that all parts form resistors and capacitors to transistors, even wires are sensitive to vibrations. We stuggled to make the Nibiru as inert as possible in this regard.