AUDIO CONSULTING

 SWITZERLAN

IN A WORLD TRULY APART

MIPA AMPLIFIER SERIES

The bandwidth of the MIPA output transformers goes up to 95 kHz

 

The MIPA is  - as the name suggests - designed for pure battery operation. When fully charged, moderately efficient speakers could be driven for eight to ten hours, higher efficiency ones even longer. Now you may say, other manufacturers have already had this idea. True, but that's not everything of course.

 

Here, the house specialty is also the transformer, an essential part of the circuitry. The signal first passes through an input transformer which additionally splits the signal into plus and minus. From there it goes to the MOSFET amplification stages, one for plus and one for minus. The transistors are mounted on a small spring-mounted circuit board. This is the only place that is not hand wired.

 

An interesting side note: The electrolytic capacitors on the circuit board are stripped, meaning the plastic cover on which the data and polarity is stamped, has been removed. This is responsible for quite bit of sonic improvement.

 

The signal goes from the MOSFETs through another transformer to the output jacks. This will optimize efficient signal transmission to the speakers.

 

The bandwidth of the output transformer goes up to 95 kHz. The transformers are meticulously wound in-house using proprietary techniques so that they greatly minimize thermal distortion. Some listeners are probably concerned when they hear that there are transformers in the signal path. You should remember, however, that professionals in the recording world use transformers everywhere and therefore not one "transformer-free" recording exists. The transformers employed have a specially selected core material of 035 grain oriented silicon iron.

 

Meticulous attention is paid to the signal path by connecting all components with in-house silver wire. In addition, most components are not bolted, but clamped between the top and bottom of the unit with wooden columns and felt pads, thus damping them from vibrations.

 

But if that is still not enough, there is much more to the design. The basis for this was written in several articles in the French magazine “L'Audiophile” in the late 70’s. Here, a French rocket scientist with the pseudonym Héphaïstos, examined the phenomenon of thermal distortion in transistors. This phenomenon does not seem to be very well known today or just may be ignored. In this extremely interesting essay, not only basic, but very complex circuits are described in which a multitude of semiconductors mutually try to compensate for this thermal distortion. Audio Consulting take a different path and try, on one hand to produce less distortion by using very simple circuits, and on the other hand to compensate for the rest by using specially wound transformers. It is certainly striking that the equipment remains cold even after many hours of operation.

 

To switch the unit on, the main knob has another special feature: besides "on" and "off" there is also a middle setting, which is always engaged briefly when turning on the machine. In order to limit the power up current, it is first sent through resistors to the capacitors - only when in the "On" position receiving full voltage. This protects the contacts of the ELMA switch from increased wear and tear.

 

The amplifier comes in Stereo and Mono versions. The Stereo delivers 30 watts and the Mono version delivers 120 watts, both respectively into 8 ohms with 4 and 8 ohm taps.

 

The above commentary from TEST 02.05.2013 by  JÜRGEN SAILE of HIFI STATEMENT, Germany.

                        ... read more 

"To me, some transistor equipment sometimes sounds too much like hifi and too little like music. This is totally my personal opinion that you, of course, may disagree with.

Here, however, a piece of equipment is only successful if it can really make music. And nowhere is a tube to be found! Its sound reproduction is very clear, especially in the upper frequencies. But also an acoustic bass is reproduced with a lot of color and nuance. Particularly for a "grandma", bass sounds are not a black hole, a clear distinction between open and fretted strings must be heard. When connected to speakers with the right efficiency, reproduction on the MIPA is tremendously exciting and fast. The music gets very intense – reading the newspaper at the same time is not possible!"

 

JÜRGEN SAILE - HIFISTATEMENT

MIPA 30   Stereo Power Amplifier

MIPA : Mains Independant Power Amplifier

Product Features

  • Linear solid state amplifier / 30 W output power

  • Class A topology

  • Input transformer

  • Output transformer with 4 and 8 ohms tabs

  • Very low idle power dissipation                            This is not a PWM design however !

  • Battery power

  • High speed electrolytics as power supply by-passes

  • 100% wooden chassis

  • Eichmann CablePod Binding Post

  • Eichmann PhonoPod RCA Socket

 

MIPA 30 Stereo Amplifier / Copper Transformers

$ 15,500    Black Wood Chassis 



MIPA 30 Stereo Amplifier / Copper Transformers

$ 18,800    Maple-palisander Natural Wood Chassis 

 

MIPA 30 Stereo Amplifier / Silver Transformers

$ 28,500    Black Wood Chassis 



MIPA 30 Stereo Amplifier / Silver Transformers 

$ 31,800    Maple-palisander Natural Wood Chassis 

SPECIFICATIONS

MIPA-i 50 Cu   Integrated Amplifier

MIPA : Mains Independant Power Amplifier

Product Features

  • Linear solid state amplifier / 50 W output power

  • Class A topology

  • Input transformer

  • Output transformer with 4 and 8 ohms tabs

  • Very low idle power dissipation                        This is not a PWM design however !

  • Battery power

  • High speed electrolytics as power supply by-passes

  • Copper Input & Output Transformers

  • Copper Rock TVC Attenuator

  • Absolute 0/180 Phase Switch

  • 3 x RCA Inputs  /  2 x RCA Outputs

  • 100% wooden chassis

  • Eichmann CablePod Binding Post

  • Eichmann PhonoPod RCA Socket

 

MIPA-i 50 Cu   Integrated Amplifier

  • Copper Transformers

$ 24,500    Black Wood Chassis 



MIPA-i 50 Cu   Integrated Amplifier

  • Copper Transformers

$ 27,500    Maple-palisander Natural Wood Chassis 

MIPA 120   Monoblock Power Amplifier

MIPA : Mains Independant Power Amplifier

Product Features

  • Linear solid state amplifier / 120 W output power

  • Class A topology

  • Input transformer

  • Output transformer with 4 and 8 ohms tabs

  • Very low idle power dissipation 

  • Battery power

  • Low tempco and low tolerance resistors

  • Low distortion power supply decoupling capacitors

  • Wired w/ Audio Consulting cotton/ cryo silver wire

  • Eichmann CablePod Binding Post

  • Eichmann PhonoPod RCA Socket

 

MIPA 120 Monoblock Amplifier / Copper Transformers

$ 31,000     Black Wood Chassis



MIPA 120 Monoblock Amplifier / Copper Transformers

$ 37,600     Maple-palisander Wood Veneer

 

MIPA 120 Monoblock Amplifier / Silver Transformers

$ 44,000     Black Wood Chassis

 

MIPA 120 Monoblock Amplifier / Silver Transformers

$ 50,600     Maple-palisander Wood Veneer

MIPA REFERENCE AMPLIFIERS

 

 

After many years of offering MIPA amplifiers, the need for a state of the art version of this amplifier has become obvious

 

Over the last five years, we also have started developing toroidal versions of our Silver Rock transformers (see Meteor AVC and Meteor MC step up). Using exotic magnetic materials, silver wire and new winding technologies lead us to new levels in transformer performance in audio. 

 

The MIPA Silver Rock Reference is built using even better power supply capacitors and extremely low tempco and low tolerance resistors. In order to further lower supply impedance, we deliver external batteries for the MIPA Reference, which allows for bigger size of the latter.

 

The 30 w and 120 w versions of the MIPA Reference come with one additional cabinet containing two external batteries (total two cabinets).

MIPA REFERENCE SERIES

MIPA 30   Stereo Reference Power Amplifier

MIPA : Mains Independant Power Amplifier

Product Features

  • Linear solid state amplifier / 30 W output power

  • Class A topology

  • Silver Rock Toroidal (SRT)  Input transformer

  • SRT Output transformer with 4 and 8 ohms tabs

  • Battery power

  • Supplied with 1 x wood outboard Battery Chassis

  • Extremely low tempco and low tolerance resistors

  • Very low distortion power supply decoupling capacitors

  • Wired using Audio Consulting cotton/ cryo silver wire

  • WBT Silver Nextgen Binding Post

  • WBT Silver Nextgen  RCA Socket

MIPA 30     Stereo Reference Amplifier

$ 53,000    Black Wood Chassis 



MIPA 30     Stereo Reference Amplifier

$ 56,300    Maple-palisander Natural Wood Chassis  

SPECIFICATIONS

MIPA-i 120 Ag   Reference Integrated

MIPA : Mains Independant Power Amplifier

Product Features

  • Linear solid state amplifier / 120 W output power

  • Class A topology

  • Silver Rock Toroidal (SRT)  Input transformer

  • SRT Output transformer with 4 and 8 ohms tabs

  • Battery power

  • Supplied with 2 x wood outboard Battery Chassis

  • Extremely low tempco and low tolerance resistors

  • Very low distortion power supply decoupling capacitors

  • Wired using Audio Consulting cotton/ cryo silver wire

  • Silver Rock TVC Attenuator

  • Absolute 0/180 Phase Switch

  • 3 x RCA Inputs  /  2 x RCA Outputs

  • Wired using Audio Consulting cotton/ cryo silver wire

  • WBT Silver Nextgen Binding Post

  • WBT Silver Nextgen  RCA Sockets

 

MIPA-i 120 Ag    Reference Integrated Amplifier

$ 67,500    Black Wood Chassis 



MIPA-i 120 Ag    Reference Integrated Amplifier

$ 73,800    Maple-palisander Natural Wood Chassis 

MIPA 120   Stereo Reference Power Amplifier

MIPA : Mains Independant Power Amplifier

Product Features

  • Linear solid state amplifier / 120 W output power

  • Class A topology

  • Silver Rock Toroidal (SRT)  Input transformer

  • SRT Output transformer with 4 and 8 ohms tabs

  • Battery power

  • Supplied with 2 x wood outboard Battery Chassis

  • Extremely low tempco and low tolerance resistors

  • Very low distortion power supply decoupling capacitors

  • Wired using Audio Consulting cotton/ cryo silver wire

  • WBT Silver Nextgen Binding Post

  • WBT Silver Nextgen  RCA Socket

MIPA 120    Stereo Reference Amplifier

$ 57,500     Black Wood Chassis



MIPA 120    Stereo Reference Amplifier

$ 67,400     Maple-palisander Wood Veneer

PREAMPLIFIER SERIES

Audio Consulting SWGLA Preamplifier

SWGLA PREAMPLIFIER

 

 

Imagine a line preamplifier using a silver wire transformer volume control achieving very low output impedance together with a gain of 10dB...

" Infrequently, gear comes along that asks you to put aside the analytical side of your brain and just listen. The components from Audio Consulting do that. When the analytical retreats, music appreciation comes forward. The new SWGLA Preamp and Silver Rock Toroidal Phono Amplifier do things that you don't hear from other components. They reveal the kind of performance details and insights that conjure live sound.

 

This is not to short change how well they perform on the audiophile report card, with excellent grades across the board. But the Audio Consulting gear will obviously have greatest appeal to those who treasure musicality.

 

The Audio Consulting duo stimulated a pleasure factor, and all who heard it agreed: reproduced music should have that more often.

If the shoe fits (and you can afford it), there's no need to look further. Your search would likely be futile."

Positive Feedback - by Marshall Nack ....read more ...

 

 

About the Silver Wire Transformer Volume Control

The first trials with transformer based systems were rather successful and we went on into that direction ending up with custom made iron as well as custom made silver wire.

This potentiometer clearly shows that it is useless to expect resistive systems to perform without major sound deterioration.

 

One should keep in mind, that a conventional 100 KOhms potentiometer, when set at medium position, places a 50 kOhms resistor in series with the signal.

With a 300pF cable or input capacitance, this situation leads to an attenuation of - 3 dB at 11 Khz.

The lower you go with the volume setting, the narrower the bandwidth becomes right in the audio band !

 

One finally understands why at low levels our audio systems sound so bad.

 

With a transformer - potentiometer you have the opposite situation. The lower you go with the volume, the lower the output impedance of you system becomes and the wider the bandwidth.

 

Besides bandwidth problems, we have noticed that putting resistors in series with the sound signal always results in dynamic constriction and loss of details.

 

On top of that, a transformer enables the discontinuity of grounds, which helps to keep RF and LF noise as low as possible.

SPECIFICATIONS

SWGLA   Line Preamplifier

SWGLA : Silver Wire Gain Line Amplifier

Product Features

  • Battery driven, feed back free and unity gain solid state devices as transformer drivers

  • Maximum 50 Ohms output impedance

  • Very low idle power dissipation

  • No heat sink

  • Battery power

  • High speed electrolytics as power supply by-passes

  • Eichmann PhonoPod RCA Socket

  • Phase switch option  + $1200

  • Wooden chassis

  • Custom features upon request

  • Silver Rock TVC Attenuator

  • Absolute 0/180 Phase Switch

  • 3 x RCA Inputs  /  2 x RCA Outputs

  • Wired using Audio Consulting cotton/ cryo silver wire

 

SWGLA       Silver Wire Gain Line Amplifier

$ 16,500    Black Wood Chassis 



SWGLA       Silver Wire Gain Line Amplifier

$ 19,800    Maple-palisander Natural Wood Chassis 

Audio Consulting Logo Badge

SILVER ROCK TVC

Passive Transformer Volume Control

 

The use of resistive elements for volume control leads to major sound deterioration !

 

First we would like to explain our general philosophy :

 

There always is one optimum for a given problem. It costs tremendous amounts of time to find it, but this is the only way to make real progress.

 

If you want a cheap solution for your potentiometer in your sound system, then use carbon pots. They are more neutral than the expensive plastic ones and of course much cheaper.

 

If however you want the best possible solution to your potentiometer problem, then you should try our silver wired transformer - potentiometer that really is a world apart from other volume setting devices.

 

Many years ago, when we still believed that we can achieve good sound with conventional potentiometers, we made a 100 Kohms 24 position stepped potentiometer using specially selected Tantalum resistors. This was a lot of work and we were proud of it.

 

We wanted to see how much better it was comparing it to a surplus graphite type pot. Even if it was very difficult to admit, the graphite type was better sounding and we decided that we need some fundamental research to be undertaken.

 

The first trials with transformer-based systems were rather successful, and we went on into that direction ending up with custom made iron as well as custom made silver wire.

 

This potentiometer topology [ aka TVC ] clearly shows that it is useless to expect resistive systems to perform without major sound deterioration.

 

  • One should keep in mind, that a conventional 100 kOhms potentiometer, when set at its medium position, places a 50 kOhms resistor in series with the signal

  • With a 300pF cable -- or input capacitance -- this situation leads to an attenuation of - 3 dB at 11 Khz

  • The lower you go with the volume setting, the narrower the bandwidth becomes right in the audio band !

  • Besides the bandwidth problems, we have noted that putting resistors in series with the sound signal always results in dynamic constriction and loss of details

  • One finally understands why at low levels our audio systems sound so bad

 

With a transformer-potentiometer you have the opposite situation :

 

  • The lower you go with the volume ... 

  • ... the lower the output impedance of your system becomes ... 

  • ... and the wider the bandwidth

  • On top of that, a transformer enables the discontinuity of grounds ...

  • ... which helps to keep RF and LF Noise as low as possible

The SILVER ROCK TVC is our EI Topology design, and is now in its 4th Generation of development. Although the 1st Generation is still by today's comparative standards still a vastly superior product, implementation of significant materials research-driven improvements of the magnetics and winding techniques have led to even better results, bettered only by another one of our developments -- the Silver Rock Meteor AVC that is based on our latest Silver Toroidal Transformers ... see below.

SPECIFICATIONS

SR TVC   Passive Line Signal Attenuator

SILVER ROCK TVC : Passive Transformer Volume Control

Product Features

  • Transformer with 24 logarithmically set up secondary windings

  • EI Topology

  • Absolute Phase Switch

  • +6 dB gain version available

  • 3 switchable inputs

  • Phase switch option  + $1200

  • Silver wire coils

  • Very exotic magnetics

  • Very special winding techniques to achieve optimal filling characteristics and low losses

  • Very special assembling techniques 

  • Distortion & Noise : almost unmeasurable at all frequencies

 

SILVER ROCK TVC       Silver Transformer Volume Control

$ 12,000                      Black Wood Chassis 



SILVER ROCK TVC       Silver Transformer Volume Control

$ 15,300                      Maple-palisander Natural Wood Chassis 

SILVER ROCK METEOR AVC

Passive Auto-Transformer Volume Control

 

 

The new "Meteor" inductive volume control really is a quantum leap in this technology

 

The story of the birth of a new “Meteor”, or how to create an AVC for the absolute purist :

 

Some time ago, one of our customers and Silver Rock enthusiast made an inquiry for a cost-no-object TVC.After he tried the latest MC Step Up called “Meteor”, that was built into a stealth type of wooden cabinet, he was so impressed that he wanted the same cabinet and magnetic core to be used for a silver wire reference volume control.

 

The cabinet was not so much the problem when considering such a project.We had developed it already for the Mc Step Up transformer, so it was available.It was the winding of several thousand turns onto a toroidal magnetic core and the 22 logarithmically set output loops, which were the real challenge.

 

Indeed, the special magnetic core we use in the “Meteor” Mc Step Up does not allow for machine winding (using the traditional toroidal transformer winding machines), but calls for 100% hand labour.

 

Moreover, the customer wanted to have the HF resonance set as high as possible, and thus a very wide bandwidth as well as less than 100 ohms DCR.

 

After several trials, we decided to go for an autotransformer volume control device.Mind you, even AVC do have HF resonance and it took us a few more prototypes to get there.In the end, we came up with a device that is resonance free up to 2 MHz, where it slowly starts to attenuate the signal with a 6 dB slope.

 

To our knowledge, this is the first magnetic volume control device that uses toroidal magnetic cores.It takes two and a half days of hand labour (no machine in the process whatsoever) to produce such a coil.

 

Each AVC is then carefully mounted into a cylindrically shaped wooden enclosure, and a pair of the latter is then mounted into the “Meteor” cabinet.The meteor cabinet that was first used for the MC Step up transformer is a very special design.It is CNC milled out of a single block of wood. Not only its outer shape is of stealth technology, but also the inside shows not right angles.This allows for very low impact of sound waves to the outside of the cabinet, while waves travelling in the inside of the wood also find only a minimum number of flat surfaces.

 

The combination of the “Meteor” cabinet and the new AVC is sonically very much superior to any magnetic volume setting device we have ever heard.The customer is happy with this very special item and we decided to add it to our list of products that are regularly available.This AVC was meant for the purist, and thus has only stereo input and stereo output.

 

HIFISTATEMENT / GERMANY REVIEW LINKAudio Consulting mit neuem Silver Rock Meteor Audiotransformer Volume Control

Audio Consulting Silver Rock Meteor AVC Gallery
Audio Consulting Silver Rock Meteor AVC Gallery
Audio Consulting Silver Rock Meteor AVC Gallery
Audio Consulting Silver Rock Meteor AVC Gallery
Audio Consulting Silver Rock Meteor AVC Gallery

SPECIFICATIONS

SR METEOR AVC   Passive Line Signal Attenuator

SILVER ROCK METEOR AVC : Passive Auto-Transformer Volume Control

Product Features

  • Autoformer Toroidal Topology

  • Cryo treated Silver wire

  • 22 algorithmically set outputs

  • 75 ohms DCR

  • 80 Hy primary inductance

  • Toroidal magnetic core of very special properties

  • Hand coiled using no machine whatsoever

  • Bandwidth up to 2 MHz

  • “Meteor” wooden stealth cabinet

  • Available in wood finish, black or dark grey

  • Distortion & Noise : unmeasurable at all frequencies

 

SR METEOR AVC         Toroidal Auto-Transformer Volume Control

$ 29,500                      Black or Grey



SR METEOR AVC         Toroidal Auto-Transformer Volume Control

$ 31,500                      Natural Wood Finish

Constantin Gregg-Saad with Audio Consulting Reference System in Nashville

The Audio Consulting Reference System

 

DVAIJNOY Rubanoide Speakers

RUBABASS Bass MK1 Speakers

RUBANOIDE 2-Way Speakers

RUNANOIDE Supertweeter

Silver Rock MIPA Reference 30W & 120W Amplifier

SWGLA Preamplifier

Silver Rock Meteor AVC Auto-former Attenuator

MIPA 120W Monoblock Bass Amplifiers

Silver Rock Reference NOS DAC

Silver Rock Phono Stage

MINIMA Turntable

Thomas Schick 12" tonearm

KOETSU RSP Cartridge

Audio Consulting Reference Silver Cable

Constantin Gregg-Saad - Audio Consulting of Switzerland Auditorium in Nashville.

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