Marco Rutz's
Date of "Visit":
11 March 2002










e-mail to:
Marco Rutz

My name is Marco. I live in Schwyz. It is the main city of one of the three foundation cantons of Switzerland. Schwyz is about 60 km south from Zurich and rather a village than a city. I like the place very much, although it is in the country where only "foxes and rabbits say good night to each other".

I started this hobby about thirty years ago, but I did not have the budget necessary for an excellent sounding system. Today, I developed my own system based on individuality and the actualisation of my own ideas.

25 years ago I analysed several constructions and learned that the two main reasons for bad sounding systems were the high complexity of electronics and the crossover topologies. Other reasons I often came accross were the mediocre quality of electronic components and the neglect of several details such as vibration, materials involved, magnetism, distortion spectrum etc.

Those years the magazines " l'Audiophile ", " Wireless World "and several articles written by Jacques Mahul, Jean Hiraga, Siegfried Linkwitz, L.J.S: Bradbury, Roy F. Allison influenced me very much.

Then, as 23 year old I designed and built my first set of electronics: the Preamplifier No.1, the Active X-over No.1 and the FET Class A Power Amplifier No.1. This Power Amplifier has been produced for several music enthusiast and colleagues. Today, after 22 years some of these power amplifiers are still in use and according to the owners they perform much better than many high rated commercial amplifiers.

Up to now I have built this and that as you can see on the list below. My last project has been the Fullrange TML Speaker No 3 using Manger's Bending Wave Transducer MSW. In my opinion this transducer is one of the best loudspeakers ever made in the frequency range of 150Hz to 24kHz. Unfortunately, the Hi-Fi community still does not pay enough attention to the MSW.

I am very lucky to have enough space for the equipment: The room dimensions are 2.4m x 5.6m x 3.6/6.7m (35 m2) . WAF has never been an issue, I assume it's due to the fact that I always tried to design the equipment as elegant as possible.

I listen to many styles of music, which comprises approx. 25% classical, 30% jazz and 45% rock, pop and electronic music.

Evaluation LP's and CD's:


Title, Artist


Reference no.


Edition Ira Gale


6 LP Set Limited Edition No.479


Cantate Domino


Proprius, ATR002


Gitarr-Kvartetten, Transkriptioner


Opus 3, 70-10


Carmina Burana, Clemencic Consort


Harmonia Mundi, HM335


At the Pawnshop


Proprius, ATR003


Rickie Lee Jones


WB 56628


Under the Pink, Tori Amos


WB 7567-82567-2


The Gold Experience, Prince


WB 9362-45999-2


Secret World Live, Peter Gabriel (Live)


2 CD Set, Realworld, PGDCD 8


Quicksilver, DJ Quicksilver


DOSorDIE Recordings

 System's Components


Current Components

Former Components


Micro Seiki, modified:
- body filled with concrete: weight 50kg
- 4 layer platter (different materials)
- modified electronic circuit
- extra cabinets for electronic circuit, transformer

- Rega Planar 3,
- Ariston (modified),
- Linn Sondek (modified)


Syrinx PU3, modified:
- tonearm wires
- mounting base
- Copper/Silver/PTFE Cables

- Rega RB-250,
- Formula IV,
- Technics EPA500 (modified)


Audio-technica AT-OC9,
Clearaudio Delta

- Decca (modified),
- Denon DL103 (modified),
- Dynavector


see section Preamplifier

- Denon AU340 transformer,
- Prepre Hiraga (DIY)


Homebuilt Preamplifer System No. 3,
- Fully operated with accumulators
- Volume control uses 12 position military grade switches
- all resistors are carbon composition types
- no electrolytic capacitors used

- Quad 22 (modified)
- Quad 33 (modified),
- Meridian (modified),
- Exposure,
- Hafler (modified),
- Homebuilt Preamplifier No.1 & 2


Homebuilt active X-over No.1


Sony XA50ES, modified:
- clock replaced
- analog section partly replaced: resistors, capacitors, solid state elements, cables etc.
- mechanical treatments against vibration done

- Marantz's first CD-Player (mod.),
- Marantz CD17 (modified),
- Sony XA7ES (modified)


Sony JA50ES, modified
Sharp MD-MS200H

- Revox A700 (modified),
- Nakamichi Tape Deck (modified)

Power Amplifier

Homebuilt FET Class A Amplifier No. 2, Features:
- fully operated with accumulators
- no capacitors used within signal path
- no electrolytic capacitors used
- stable and linear bandwith up to 2 Mhz
- two stage design
- 8 W class A , peak power up to 20W
- all resistors are carbon composition types
- main distortion characteristics like tube amplifiers

(please refer to the images)

- Quad II (modified),
- Quad 303 (modified),
- Meridian (modified),
- Exposure,
- TVA (modified),
- Electrocompaniet, ML-2,
- Homebuilt FET Class A Amplifier No.1

(please refer to the images)


Homebuilt Fullrange TML Speaker No 3 using Manger's Bending Wave Transducer MSW,
- 4 layer box with floating inner chambers
- 3 chamber system
- Transmission line port
- aperiodic damping (lowers system Q)
- no traditional damping technics used
- sensitivity is 90db/2.83V/1m, max. SPL 104db
- the system manages 40Hz-24kHz (+/-3db)
- weight 60kg per piece

(please refer to the images)

- KEF (small BBC Monitor),
- Quad ELS 55/57 (modified),
- Homebuilt Onken Mahul Speaker

System No. 1,
- Homebuilt Fostex Magnetostat

Speaker System No. 2

(please refer to the images)


Sennheiser HD590

Stax, Sennheiser


Copper/Silver Cables, PTFE-insulated (types used in spatiales)

SAEC, Leonische, Isoda, Mogami, XLO


RDC, LAST LP-treatment, Decca LP Brush, MC and Neutrik Connectors, homebuilt component rack

ADC-Headshell, Super Black, Line Power Filters, Wine

Pictures' Legend:

1. Homebuilt Onken Mahul Speaker System No.1 and FET Class A Amplifier No.1 and X-over No.1

2. Homebuilt Fostex Magnetostat Speaker System No.2 with FET Class A Amplifier No.1

3. Homebuilt Fullrange TML Speaker No.3 using Manger's Bending Wave Transducer MSW

4. Homebuilt FET Class A Amplifier No. 2; here without cover

5. Homebuilt component rack and component string suspension

6. Close-up of homebuilt Preamplifier No.1, Power Amplifier No. 1, X-over No. 1

7. Close-up of homebuilt Preamplifier System No.3

Marco's comments about his System:

AA: "Marco, how would you describe your system's sound?"

MR: "In my opinion, the most important quality of a system is that it conveys emotions and you are able to forget the loudspeakers. Normally I do not like descriptions like slow, fast, depth, tight, harsh and whatsoever... I will have a go! Think of the micro dynamics of a horn speaker driven by a tube amplifier, the coherence and sound resolution of an electrostatic speaker, the bass of a medium-sized two way speaker driven by a solid state amplifier and the holographic sound reproduction of a single fullrange speaker - that's it, a nice emotion mediator system!"

AA: "Do you think there is room for improvement?"

MR: "Yes of course, generally speaking, there is always room for improvement! Although my system has been in a permanent evolution and improvement process I cannot imagine ever stopping to initiate changes. I do not feel the urge to force any major changes immediately. I am pretty happy to enjoy the music.

AA: "Have you got plans for upgrading?"

MR: "I always produce numerous ideas and possible upgrades. Therefore, for me the question is rather a rhetorical one. Yes, there are lots of plans but I have no idea how and when I will start to tinker with my system. However, to be honest, I have some plans to improve the clock part in the CD player again and to play with additional damping techniques on the speaker system no.3!"