THE REFERENCE series
M600 power amplifier
Our Goal: Providing Music in Its Purest Form
TAD’s philosophy has remained unchanged for over 30 years: deliver sound that conveys the full range of emotions without alteration. This philosophy has driven us to develop technology for reproducing music in its purest form. Over the past three decades our technology has advanced the ultimate limits of quality sound reproduction, to achieve the finest in performance. The result is the 600W/4 ohm total balance M600 Monaural Power Amplifier, transforming the ideal into reality and offering the guaranteed quality and uncompromised design that only TAD can provide.
The basic concept of the TAD M600 is the realization of total symmetry and the fusion of technologies into one perfect form to achieve the ultimate in sound reproduction. The BTL (Bridged transformer-less) design is created with total symmetry. Every aspect has been examined and optimized: the twin power transformers, the parallel positioned electrolytic capacitors and the layout of the components on the circuit board. All are designed to be symmetric with regard to influences such as temperature change, magnetic fields and vibration.
CAST-IRON MONOCOQUE CONSTRUCTION
The M600 employs a 35kg graphite cast-iron monocoque construction to reduce the effects of vibration to the absolute minimum. Compared to regular cast-iron, inner loss is increased making it extremely effective at vibration damping and resonance control. The 18mm (0.7 in.) thick aluminum front panel, the low center of gravity brought about by the adjustable spikes extending downwards from the wide-stance chassis and the aluminum plating in the spaces between the chassis and the components (such as the power transformers and capacitors) all act together to minimize the influence of any vibration. The independent chimney-style heat sink completes this total defense against vibration.
C2I GROUND TECHNOLOGY
The greatest benefit of balanced circuitry is that virtually no electric current flows through the ground. The self-contained heat sink shields the circuitry from the large signals that powers the speakers, thus preventing any potential difference. The balanced amplifier’s ground potential is therefore completely isolated.
For an amplifier to transmit the input signal with complete accuracy to the speakers, the circuit should be as simple as possible. To this end, the M600 is designed to achieve its voltage amplification in just one stage. Combined with current feedback, the amplification stage achieves extremely stable performance. This makes it possible to simplify the phase compensation circuit and eliminate the output choke. Additionally, situating the circuit board directly in front of the rear panel allows the shortest possible signal path from input to output. With the large heat-sink separating the circuit board from the power circuitry, interference from magnetic and electric fields is minimized.
In order to bring the ideal into reality in design and construction the M600 relies on parts of only the highest quality. PPE (Polyphenyl Ether), commonly used in communication satellites, is combined with 135um thick oxygen-free copper foil to create our unique circuit boards. Permittivity is reduced, the capacitance of the pattern is as small as possible and signal transmission losses up to the very high frequencies are minimized. The core of the 10kg (22 lb) transformer is wound with insulating sheets and 2.6mm diameter heavy copper wire to form our exclusive independent winding power transformer. With a power supply using four custom built 33,000uF capacitors, every circuit detail has been studied and optimized to ensure the highest quality.
In order to ensure the absolute maximum product quality the M600 is the beneficiary of total precision at every point in its construction process. The utmost care is exercised in maintaining the quality of every part. One example is the extremely high level of technology that is utilized for the cutting of the ventilation ducts in the aluminum top panel. To achieve the absolute quality demanded by TAD products, all components are developed in a custom workshop and hand assembled by veteran engineers worthy of being called audio craftsmen. This meticulous assembly process uses torque-regulated screws to prevent any distortion in the casing, resulting in a product that truly can be considered a masterpiece.
600W (20Hz to 20kHz, THD 0.2%, 4Ω)
300W (20Hz to 20kHz, THD 0.2 %, 8Ω)
1Hz to 100kHz, +0/-1dB
Less than 0.03% (20Hz to 20kHz, 300W, 4Ω)
29.5dB (Input sensitivity 1.5V)
XLR/220kΩ x 1
Custom large screw terminal x 2 pair
(bi-wire connection available)
516mm (W) × 307mm (H) × 622mm (D) (with spike bases)
(20-5/16 in. (W) x 12-1/16 in. (H) x 24-1/2 in. (D))
90kg (198.4 lb)