Circuit Chassis Interface FAQ


What is the CCI?
For about 20 years I haven't been thinking to label my work with a name (and, before me, Grundig engineers did the same). Only in 2004 I started to use the acronym "CCI" for this purpose. It means "Chassis Circuit Interface" and it remarks the importance of a carefully addressed and systematic implementation in the chassis frame (and, of course, in the circuit) to avoid any RF noise generated by both external and internal factors that can intermodulate audibly the audio signal. Unfortunately these problems can't be solved damping panels with bituminous materials or using non-ferromagnetic materials. I have spent 20 years of my life studying the problem, basically to improve audio results.


Why do Grundig CCI were not discovered?
For two reasons equally important:

1) the Grundig "brand" was famous for radios and tv sets. The Grundig HiFi products were unknown and not easy to find into HiFi specialized shops. This is the reason why almost nobody has ever known and could ever hear them compared to other hi fi products.
2) in the 70s-80s period, the first rule for all the hi-fi magazines was:"an hi fi system must be composed by separated devices".
They were used to give great importance to the measures instead of listening. The "everything separate and different brands"
rule, associated with low distortions (-100dB level!) forced the people to ignore Grundig products, made to be perfect for the german "DIN 45500" rules.

How do they discover the CCI system in Grundig?
The CCI system was at its best in Grundig from the beginning of the year 1974 to the 1979. They had a momentary negative period in 1980-82, in which they made products with a "japanese" design chassis.
This caused a worsening because the design team had to revise certain design criteria due to the totally different frame. The final
solutions for the new chassis design was found in the 83-84 products. It demonstrates that the technical solution was not so easy even if they were already knowing the problem on a different frame (from 75 to end 79). Everybody can notice that the study of the CCI in Grundig components was not "a single case": in fact ALL Grundig components of that period sound in the same beautiful way (with very subtle differences) and they all are so dramatically different from any other brand....

Why Grundig company has lost the heritage of CCI know-how?
Grundig was absorbed by Philips in 1986 and the HI-FI engineering work was completely outsourced (the production was already). The internal technical team was re-directed to another task in video-equipments engineering. I think that they did not patent the CCI implementation because, once disclosed, it would have been easily copied with some small variation. So, the Grundig marketing worked on the "quality" message in all catalogs (the only true case!) not mentioning the special features of these products (which would have made competitors curious...).

Which is the reason why these important products have been unknown for 30 years?
Some people nowadays know Grundig qualities (mostly due to my website) but it is still difficult for others to check easily it: the only way to listen these products is to find a friend who have them at home! The official hifi channels defend their sponsors and the dogma of untouchability of The "High End". They are very expensive
components, built like a tank, but a lot worse than any CCI product. Only a few Italian and foreign people, they can testify the CCI qualities but, every time they try to start this topic in some HiFi forum, the reaction by those who defend the untouchability of the "High End" is rough and angry. So the truth in this case cannot be
unveiled !

Does LT design share the same electronic circuits with Grundig?

No. The LT products share with Grundig only the same CCI chassis tuning. Another difference is that LT amplifiers do not have any tone controls, in order to reach the maximum linearity of response. It is a subtle difference anyway.

How did you discover CCI and Grundig?
I've built my first "big" 100W power amplifier in 1983 following the advices and the rules of the most important technical magazines (high slew rate, high output current, zero feedback, etc). It was simply orrible to listen! .... while a small 10W amplifier built by myself at high school (absolutely unpretentious) was a joy to my ears, so I thought: "are the experts kidding me?"
Then I started in 1984 my work and studies in seeking the mysterious secrets of the HiFi reproduction. 6 years later, I accidentally listened to a Grundig HiFI system: I discovered a "new world" and I had the opportunity to study that amazing tecnology, improving my experience and my know how. I have been learning a lot from Grundig...

What brand is LT?

Linear Transfer is not a commercial brand but simply a trademark that I've given to my projects. My products are the result of twenty years of research work on CCI. The hope is that there may be some company that is interested in CCI in order to start a series production. The benefits would be enormous and with small investment as they can easily modify their actual production line. Im ready to demonstrate the CCI performance to any hifi company that is interested in this kind of technology.

What are the sonic peculiarities of the CCI components, which you prefer so much than any others?

Basically the harmonic space! Listening to a CCI system you can hear (with almost any records) the room where the sound was recorded: this is due to the ability in reproducing any subtle and minimal nuance originally recorded. The sound flows freely with no hardness even at higher levels. It unveils so many details simply unkonwn by the other hifi systems. More peculiarities are the absence of excessive microfonic "sssss" on the voices, the "dynamic ability" (impact without any harshing) and the sound definition: the different timbers never jam or cover each others.


Why it is better to have in the HiFi chain every component featuring CCI?
Just think about a trasparent and clean "windows, you can perfectly look through: every non-transparent glass (obscured or colored) compromise the vision of the landscape which is then deformed and overshadowed. In the audio it is the same! The best result is with all transparent windows.

Even the loudspeakers do they feature CCI?
The CCI intervention on loudspeakers systems is less important, as they are not affected in the same way as electronics although that does not mean that it is negligible...

Where can we listen or purchase this kind of CCI equipments?
The people of our forum organize every year some "meeting" in different cities of Italy in which you can bring your personal hifi components in order to compare them directly to a complete CCI chain. You are also welcome to my home and you can listen to my CCI systems: the only condition that I pose is to bring with you one or more hifi component for a direct comparison (at least your amplifier and CD player would be desirable), so the differences can appear clearly and evident. Regarding the possibility of purchasing Grundig components, the place where to buy are and (with fewer risks) the market of our Italian forum. Unfortunately, the greater risk is to find components in bad conditions, not completely original (some parts replaced) or even broken.

Reading the comments on various forums on the web, I find that you are told as a kind of sect of sick guys.

Is it dangerous to share your opinion?
Well, the only real risk is to save a few thousand (or ten thousands) euros .... and for someone this is very dangerous...

home (GB)       home (I)         e-mail