2018/08/29 created
2022/05/25 updated

Purpose of This Website

I began, in 2010, writing "Tonochi's Audio Room" in order to put my experiences as an audiophile in writing. I am only an amateur, though, I have experienced many things in my hobby, DIY audio, since 1970. Now I have my own point of view and methods in this field. I believe showing my experiences to public is meaningful in any way for people who are interesting in DIY audio. I'd appreciate if readers would refer to this website as a helpful information.

I wish that not only experienced audiophiles but beginners and music lovers visit this website.
I was originally a liberal arts student. Now I can design circuits, PCBs and simple mechanisms. My designs may not as good as ones designed by professional engineers, but my audio equipment is as good as my friends praise very highly. Anyone with enthusiasm can build his/her own unique audio devices. I'd be very happy if any readers would take up DIY audio by being inspired by this website.

This website is originally written in Japanese. I would like this website to be read by non-Japanese people. So I created this English edition. The contents are the same as Japanese edition.
These days, machine translation (automatic translation) technology is advancing in quality, though, I translate my website by myself, because I'd like to express my opinion by my own words.
[Japanese edition]

Pages on This Website

This website contains the pages shown below:

Page title Contents
Top page [Go] The top page of this website "Tonochi's Audio Room II".
Info This page; it explains the purpose of this website, and introduces pages here.
System Design
The page on the system design of the DIY audio system Gaudi II, which is the main subject of this website. This page also describes the concept and the goal of Gaudi II.
System Build
The page on the actual Gaudi II. This page gives the current status of Gaudi II, the difference between the system design and the actual Gaudi II, and lessons I learned from building Gaudi II.
My Components
This page introduces all the audio devices I've built. It also explains my private brand "NOBODY" and model numbering system. *1
The page of reference materials concerning audio; This page includes documents on my own methods and theories, called Tonochi Method and Tonochi Theory, respectively. It also contains the glossary, a list of references and information about tools for DIY audio.
Contact [Go] Email address of Tonochi and links to other websites Tonochi recommends.

*1: My works are categorised as shown in the following list:

Analog disc player (record player)
MC head amplifier, phono equalizer
HA-213, PE-114 Petit
Preamplifier, crossover network
PA-202, PA-203, PA-210 Simplicity, MV-217 X'tal, CD-206, CD-211 A-NET
Power amplifier
MA-201, MA-205, MA-208, MA-215 Arabesque
SS-307, SS-309 Trad, SS-312 Study
AR-416 Air

About Gaudi Project

In 1974, when I was 17, I concluded that the best audio system is 3-way multi-amplifier system (triamplified system), and started building it. I decided to build every component myself since I didn't have deep pockets. It was so difficult to build everything in a short period that I took a step-by-step strategy and started with a simple mono amplifier system.

It was a 5-year plan at first. But there was no good progress. The plan was revised to a 10-year one, then a 20-year one... There seemed to be no end.In 1999, it seemed to me that I couldn't complete my audio system by the end of my life, and my system is like Sagrada Familia desinged by Antoni Gaudi. I named my audio system after the name of the great architect: Gaudi. And, I named the plan Gaudi Project.

Gaudi was completed in 2015, though, I decided to continue the project because I thought I could improve Gaudi system further by utilizing what I had learned from Gaudi Project.I name the new system Gaudi II, which means Gaudi Version 2. I plan to make it the audio system of the highest sound quality.

On this website, the main theme is the system design of Gaudi II and its implementation. Because I believe that the system-oriented approach is fundamental to realize the best sound quality.As of February 2021, the system design is completed, but the implementation has just begun. I hope the readers enjoy the process of building the audio system together with me.

Link to the Old Website

This website is a sequel of the old version (Ver. 1) "Tonochi's Audio Room".
Here's the link to the old website.

[2022/03/19] {The old website is not compatible with today's browsers, so I've closed it}
For information about the previous Gaudi project, see 'History of Gaudi'.

Technical Terms

The terms concerning audio on this website are common terms in hi-fi circles. But some of them are defined by Tonochi.
For details, see the glossary... here


The referances are indicated as 'Ref #3' on this website. The number is designated in the reference list.
The reference list is on the page of 'FYI'... here


In this website, Tonochi provides technical information about audio devices he designed. But he won't guarantee the design quality, because he is not a professional engineer.
Tonochi won't take responsibilty if the reader isn't satisfied with the sound quality of the device he/she has built according to Tonochi's design. Tonochi won't take responsibility either if the reader suffers any damage by a trouble and/or an accident that may occur in building and/or use of his/her devices based on Tonochi's design.