The most outstanding sonic virtues of the K-70 include its ability to take the loudspeakers to the peak of their performance without spurious overtones and to deliver music’ s intoxicating beauty with truth, sublime delicacy and dynamic explosiveness on a grand scale.
Dynamic simplicity, can only be achieved by the use of single ended Class A, current mode circuits, woven together in our unique way where elements mutually couple to form a strength far greater than their sum. Unavoidably expensive to execute and time consuming to create, this is the path of the K-70.
High performance loudspeakers often present reactive loads where voltages and currents are no longer in tune with each other. This places unusual demands upon amplifiers and often causes them to severely under-perform, sounding unpleasant and underpowered. It is from this notion that many brands have pursued a super high current and power approach.
The K-70’ s unique architecture makes it at total ease with such speakers and this, combined with the amplifier’s near instantaneous recovery from overload, its non reliance on protection circuits, and a total lack of time smear ensures the seventy watts available appears limitless, easily coaxing the loudspeakers to adere to the task of presenting the event even with demanding, swinging music at high volumes, but also to deliver new levels of speaker control.
The extreme complexities of hardware monitoring circuits regulating operational conditions and adjusting runtime parameters are avoided only by virtue of the fact that the Takumi K-70 is built to be the purest form of any amplifying device.
Not intended as a retrospective statement or a traditional stance or “it was done better in the old days” purist attitude, the amplifier is designed and built about the premise that if done correctly the circuit will function optimally within all operational parameters without recourse to spurious monitors, computers and applied dynamic variation of real-time values.
The meticulous assembly and testing of each Takumi K-70 amplification system takes a full two weeks and involves great personal effort and unique build team resources. This electronics heart and final unit assembly is undertaken by the designer himself.
A further one week minimum of run time in the producers music room is required to validate sonic performance before final test bench testing and packing. Rob Koch’ s search for this his final definition (and paradoxically first product) of amplification over a period of many enthusiastic years, the cost of materials, energy and Robert Koda’s unique sourcing of materials to arrive at this amplification unit.
DNA : Single Ended Class A1 hybrid power amplifier with separate power supply.
Output power : Greater than 70W (Power delivery maximised for 3 to 7 ohm loads)
Gain : 25.5dB SE in or balanced in, voltage mode. 10V/mA in current mode.
Input impedance : 30K Ohms, Voltage mode, 50 ohms current mode.
Output impedance : Less than 0.07 ohms 20 Hz to 20Khz.
Signal to Noise Ratio : Greater than 115dB A weighted at nominal output. Greater then 97dB A weighted at 1W/8 ohms
Power response : Less than 5Hz to greater than 200KHz.
Power consumption : 1000 Watts at any volume into any load.
Size : 380mm wide, 256mm high, 550mm deep (each of 3 units)
Weight : Power supply 40Kg, Mono amps 20Kg each
Operating temperature : 0 to 35 degrees Celsius.
Operating environment : Altitude sea level thru 3000m above sea level.
Storage temperature : –20 to +50 degrees Celsius.