LIFEFORCE 55

The Lifeforce 55 is a solid state, push-pull power amplifier module available to existing builders of the AKSA range. It delivers 55 watts RMS into an 8 ohm load and 90 watts into a 4 ohm load. Input sensitivity for 55W output into 8R is 642mVrms into 40K. This is a gain of 30.3dB.

The Lifeforce module is the crowning result of three years of thorough R&D. The aim has been to produce a high end amplifier of unparalleled sonics, 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 is is relatively simple. The amplifier is extremely load tolerant, yet blindingly fast.

The Lifeforce measure 82mm x 90mm (3 1/4" 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 purchaser need only connect the two power rails, an earth, the two signal wires, and the Speaker output wire. Clear instructions describel the set up procedure, which is quite straightforward and should take no more than a few minutes. The Lifeforce can easily be installed by people with limited electronics experience; if you follow simple instructions and possess some skill with a soldering iron you will be fine.

The module is suitable for loads down to 3.5 ohms, and requires only minor checks/tweaking for operating point once installed. Once operational, it needs no further attention for many years. This is one of the most outstanding designs in the hifi world.

SPECIFICATIONS:

 

Frequency Response:	-1dB points at 15Hz and 85KHz.
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, +/-5mA, with bias control incorporating thermal tracking.
Stability:	Unconditional: 1KHz Square Wave, 25W into 8R in parallel with 470nF.
Square Wave:	Triangulates at 58KHz.

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 in mind, the design 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, preliminary indications are that the Lifeforce has markedly reduced distortion over other, more conventional designs. 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. 

The Lifeforce 55 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 AKSA 55 is best suited to quality speaker systems of 87dB/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 to any buyer outright, and to Aspen customers who own an AKSA55 on a trade-in basis. Regardless of whether you presently own an AKSA or not and are considering purchase, we commend you to our fully built, tested Lifeforce 55W today!!

www.audiocircle.com

PRICES:

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