Delivering 900 watts per channel, into a 4 ohm load, the Magtech is just about all the power you will need to bring your music to life. There are also Mono versions available, for when you want, or need more...2000 watts into 4ohms
Roger Sanders designed this unique amplifier in Colorado, USA.
The regulated power supply employed is the key to it's stability and the grain fee sound is dynamic, detailed, and involving power delivery.
Roger has appointed Mcleans as his Australian Agent for Sales and Support of his products.
Warranty; Lifetime [yours].Please note that warranty is not transferable.
Magnetic speakers differ from electrostatic speakers in one fundamental way -- they require massive amounts of current and power. This causes the power supply voltages in an amplifier to change dramatically (typically by 30%) between idle and full power.
Electronics have their lowest distortion and optimum performance at a specific design voltage. If the voltage varies, the amplifier's performance will suffer.
An additional problem in amplifiers is that they require bias to eliminate crossover notch distortion and determine their class of operation. The bias will vary as the voltage does, which will further reduce performance.
An amplifier's voltage will fluctuate wildly as dynamic music is played. This causes the amplifier's distortion and bias to vary constantly and fail to meet its full performance potential.
As if all these problems are not enough, as an amplifier's voltage sags under load, the power it can deliver is greatly reduced. If the voltage would remain stable, the amplifier could produce much more power. Since most audiophile speaker systems require several hundred watts of power to avoid clipping and compression of the dynamic range, power is extremely important.
All quality, line-level electronics use voltage regulation in their power supplies to produce a stable voltage, regardless of load or the mains voltage. Audiophiles would not consider using a source component that did not have regulated power supplies. So why use amplifiers with unregulated supplies?
The main problem is heat. Amplifiers operate at much higher voltages and currents than line level source components. These higher voltages and currents forces conventional regulator designs to waste large amounts of energy, which wastes expensive electricity and causes the amplifier to get very hot.
Also, many regulator designs radiate RF (Radio Frequency) energy when switching high currents and voltages. This RF gets into the amplifier's electronics and can cause instability, oscillation, and noise. As a result of these problems, modern power amplifiers do not use regulated power supplies and fail to take advantage of the benefits available from doing so.
Sanders has solved these problems by developing a voltage regulator that is essentially 100% efficient. There is no heat dissipated by the regulator system. There is no high-power/high-voltage switching that causes heat generation or RF problems.
The regulator in the Magtech amplifier maintains a stable voltage regardless of load or reasonable changes in the line voltage feeding the amplifier. It runs stone cold, produces zero RF energy, and is simple and reliable.
Unlike other amplifiers, the distortion in the Magtech amplifier is virtually unchanged regardless of power level. The bias is stable regardless of load.
The regulator makes it possible to obtain a 50% increase in power over the same amplifier operated unregulated. In its stereo form, the Magtech will deliver 500 watts/channel into an 8 ohm load and 900 watts/channel into a 4 ohm load.
The Magtech is built into the same chassis as the ESL Amp [Rogers Electrostatic specific Amplifier], so it is compact enough (17" wide, 5-1/2" tall, 14" deep) to place on a shelf or into a cabinet. It is also light enough (54 pounds) to be picked up. Like the ESL amp, it runs very cool and may be left on continually without concern for power usage.
The Magtech amplifier also uses the same advanced technology that makes the ESL amp able to drive the most difficult loads without performance-degrading, protective circuitry. The Magtech amplifier is the only amplifier on today's market that features a linear voltage regulator. The result is a compact, yet extremely powerful amplifier that is ideally suited to driving the most difficult magnetic speakers.
We offer the Magtech Stereo Power Amplifier with local support and warranty.
But what does Bill think of the sound?
"It may take you many years, and many hours of auditioning, testing and elimination, as I have, to find a synergistic Loudspeaker/Amplifier match at a reasonable price...you need look no further than the Magtech stereo, or mono amps, from Roger Sanders to power your speakers, especially Magnepan Speakers".
The typical, first response, from everyone who listens to the Magtech and Magnepan combinationin our showroom system set-up, be they seasoned audiophiles or new comers to hi-end audio, is 'wow that's like being there!'.
Power (Stereo Version)
500 watts RMS per channel into an 8 ohm load
900 watts RMS per channel into a 4 ohm load
DC through 100kHz
Class of Operation
100K unbalanced, 1K balanced
Input voltage required for full output
More than 110dB below rated output
Less than 0.01%
Greater than 600 into an 8 ohm load
Voltage is user selectable for use world-wide.
55 pounds (25 Kgs)
17" wide x 6" (including feet tall) x 15" deep (including binding binding posts) 43cm x 15.2cm x 40.6cm
17" wide x 5.5" (NOT including feet) tall x 14" deep (NOT including binding binding posts) 43cm x 14cm x 35.5cm
The Absolute Sound
by Robert E. Greene
This has to be short, so I'll get right to the point: If you paid $5000 US [$5,500 as at November 2014]or more for a presently available amplifier and did not check this one out first, you should have. There are, in some important ways, very few competitors for this design.
And some of these, like the Lightstar and its relatives, you cannot buy any more. This is not to take anything away from other power amplifiers, many of which work really well and sound all but perfect when they are not being stressed out too much. But when the going gets really tough, not just for loudness as such but for the complex and current demanding loads that speakers present in the real world, what one needs is a regulated power supply. Hardly any contemporary amplifiers have this; this one does. This idea is not news to long-time TAS readers. Back in issue 25(!), Dave Wilson, then a TAS reviewer, wrote of some solid-state amplifier "The power supply is not regulated per se, but it is so stiff and so responsive that even on very deep, very loud material it is like unto a brick." Implied was the idea that regulated would be even better!
In practice, regulated power supplies are a true rarity in the output stages of power amplifiers of any substantial power, though they are almost universal in amplification devices at lower signal levels like preamps. They are almost universal there because they work better. And it seems they work better for large-signal purposes, too. They are just hard to arrange.
I do not have room to explain what is going on here or even what a regulated power supply is. You can get the basics at Wikipedia and there is further information on this amplifier specifically on the Sanders site (sanderssoundsystems.com).
The Magtech does not have a switched-mode power supply, the usual way to get power supply regulation in a practical form for power amps. The Magtech has a patented linear regulation system, and that makes it unique.
Does that matter? I have not run double-blind tests and so on, and of course there would be other variables since there is no way to un-regulate the regulated power supply for comparison. But in informal albeit concentrated listening, the Magtech not only drove the tricky Prince II electrostatic load very well, indeed, it also delivered truly superlative performance into dynamic speakers. The sound from my Harbeth M40s (original version) sounded precise, controlled, defined, dynamic, perfectly balanced, and extremely clean with unusually silent background and extreme solidity even in demanding passages.
Thundering piano music, for example, was as solid as a rock. The Sanders Magtech amp has power to spare, 500 watts per channel into 8 ohms, 900 into 4. But it sounds as if it had infinite power into anything with total stability. The Sanders Magtech joins (really only, in my experience) the Lightstar family and the DALI Gravity in extreme ability to handle anything and sound perfect while doing it. An instant classic in my book. Try it before you decide I am exaggerating. REG
Roger Sanders has been at this for 40 years. His first published article on Electrostatic Speakers was in 1974, followed by another on amplifiers to drive ESL's in 1976.
His contribution to audio include the invention of the curved, free-standing, electrostatic loudspeaker driver (click on image to right to view the published article); the development of extremely compact transmission line woofer systems; integration of electrostatic speakers and transmission line woofer systems; and, several "how to" construction articles in "The Audio Amateur" and "Speaker Builder" magazines.
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