LIFEFORCE 100

The Lifeforce 100 is a solid state, push-pull power amplifier module available both to outright buyers and to existing builders of the AKSA range. It delivers 100 watts RMS into an 8 ohm load and 180 watts into a 4 ohm load. Input sensitivity for 100W output into 8R is 740mVrms into 40K. The amplifier is based on the same topology as the Lifeforce 55 and has a gain of 30.3dB.

The Lifeforce module is the crowning result of three years of thorough R&D, and was developed immediately after the LF55 was released. The aim has been to produce a high end amplifier of unparalleled sonics, like the LF55, but with greater power; and the results are nothing short of stunning. Bass, midrange and top end are extraordinary, delivered with tinkling clarity and warm, intimate engagement to challenge the cream of the crop. This amplifier is electrically and sonically superlative, with astonishing impact and slam, and amazing soundstage. The Lifeforce uses extremely sophisticated circuit techniques, yet it is relatively simple. The amplifier is extremely load tolerant and fast, driving electrostatic speakers with ease, and extraordinarily stable.

The Lifeforce 100 pcb measures 125mm x 90mm (5" x 3 1/2") on a single-sided, solder-masked pcb which mounts directly to a heatsink. The module is sold fully built and tested. The user need only connect the two power rails, an earth, the two signal input wires, and the Speaker output wire. Clear instructions with diagrams and photos detail set-up, which is quite straight-forward and should take no more than a few minutes. The Lifeforce can easily be installed by people with limited electronics experience; you need only follow simple instructions and possess some skill with a soldering iron.

The 100W module is suitable for nominal 4R or 8R loads with impedance dips down to 2.5 ohms, and both bias and offset are factory set. Once operational, it needs no further attention for many years. This is one of the most outstanding modular amplifier designs in the hifi world with stunning sonics.

SPECIFICATIONS:

 

Frequency Response:	-1dB points at 15Hz and 55KHz.
Harmonic Distortion:	TBA
Topology:	Modified Class AB Bailey design, with state of the art input and output stages. Nested feedback with phase lead compensation is used.
Quiescent Current:	58mA per output pair, +/-5mA, with bias control incorporating slightly overcompensated thermal tracking for enhanced stability.
Stability:	Unconditional: 1KHz Square Wave, 25W into 8R in parallel with 470nF.
Square Wave:	Triangulates at 48KHz.

The Lifeforce audio amplifier was developed to address the intrinsic sonic problems of solid state, push pull Class AB technology. It incorporates highly innovative thinking, driven by both the engineering and the subjective sonic issues of music reproduction.  With solid engineering principles an integral part of the design, the development cycle has focused on the audiophile listening experience, and the inspired aim to transfer human emotion via the artform of music.  The justification for this is simple;  people listen to music to be moved, not to marvel at the elegance of the amplifier design.

While the subjectivist approach might be seen to downplay traditional distortion measurements and technical considerations of linearity, the Lifeforce has markedly reduced distortion over other, more conventional designs. Global feedback is low at 26dB. Distortion measurements and slew rates are outstanding, but there will always be concerns that an amplifier which measures well may not always be musical. This strongly indicates that there is more to this technology than first appears, with the latest thinking highlighting the significance of distortion spectra and the concept of monotonicity, a gradually decreasing distortion spectrum with increasing harmonic order. 

The Lifeforce 100 amplifier creates a presentation comparable to a very powerful, high quality tube amplifier, whilst delivering stunning resolution, a broad, deep and tall soundstage and a pure, extraordinarily engaging musical sound.  Like many tube amplifiers, the Lifeforce 100 is best suited to quality speaker systems of 84dB/Watt/metre or higher.

The key features of the Lifeforce are the utter absence of intermodulation, the startling transients, crystalline clarity, and palpable depth and height of the soundstage.  The midrange is forward and intimate, promoting a full engagement with the music. The Lifeforce confers extraordinary emotional communication to music, a feature regarded as unusual for a solid-state amplifier, and a quality usually evident in only the best tube amplifiers.

The designer, Hugh R. Dean, an Australian with an eclectic background in military education, business computing and language training, stands behind his product with unsurpassed 24/7 email backup.

The Lifeforce is available as fully built and tested modules and fully built and tested power supply pcb, featuring UFSR diodes with premium quality filter caps. For an extraordinarily resolving amplifier of great power which takes you effortlessly into the recording, we commend you to our fully built, tested Lifeforce 100W today!!

www.audiocircle.com

PRICES:

The prices for all our products can be found at: BUYING/PRICELIST