What is the Difference between the old Innersound ESL amp and the new Sanders ESL amp?
- The chassis is now aluminum.
- All chassis parts are thicker to eliminate resonances.
- XLR connectors are genuine Neutrik. They use professional metal sockets with locking devices.
- RCA connectors are Cardas with Rhodium plating.
- The power transformer is larger and more powerful. This has increased the amplifier's power from 300 watts to 360 watts/channel.
- The power transformer is now fully shielded in an aluminum cylinder and potted in epoxy.
- A new power supply circuit board is more compact and all wire has been eliminated (except for a 2" piece connecting the circuit board to the speaker binding post).
- The amplifier is now completely modular in construction.
- The face plate is "cleaner" and less cluttered.
- The low-level, input amplifier circuitry has been redesigned to use the latest and best transistors.
- The bias circuitry has been upgraded to provide more stable operation.
- More powerful and linear output transistors are used to handle even more power and reduce distortion.
- The new circuitry and transistors allow the use of less bias so that the amplifier runs even cooler than the original amp.
- The speaker binding posts are placed at 45 degrees for ease of routing stiff speaker cables.
Amplifiers
DESIGN PHILOSOPHY
Conventional amplifiers have serious problems when forced to drive electrostatic loudspeakers. Roger Sanders has developed the first amplifier specifically designed to drive these unusual speakers.
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Conventional amplifiers have serious problems when forced to drive electrostatic loudspeakers. Roger Sanders has developed the first amplifier specifically designed to drive these unusual speakers.
Electrostatic loudspeakers (ESLs) are very different from conventional magnetic speakers and place unusual and difficult demands on the way amplifiers deliver power to them.
A magnetic speaker presents a resistive/inductive load to an amplifier, while an ESL appears mostly as a capacitor.
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WHAT IS THE DIFFERENCE BETWEEN THE ESL AMPLIFIER AND THE MAGTECH AMPLIFIER?
Magnetic speakers draw tremendous current from an amplifier and that causes the internal power supply voltages to fluctuate dramatically in response to the music (typically by about 30%). This reduces the power from the amp and causes the distortion and bias to be modulated by the music.
A regulated power supply maintains stable internal voltages at all times. This is a tremendous improvement over a free-floating power supply. All amplifiers should use regulators, but virtually none do because their designers have not figured out how to make a powerful regulator that doesn't waste vast amounts of heat. Our regulator is unique in that it runs cold and wastes no heat. So we offer virtually the only regulated power supply amplifier on today's market.
Electrostatic speakers operate on voltage, not current. So they don't cause major fluctuations in the internal voltages like magnetic speakers do. But they will still cause some voltage modulation and mains voltage is not stable either. So even electrostatic speakers will benefit from an amplifier with a regulated power supply.
A regulated power supply will provide the best performance, so most of our customers (even our electrostatic speaker customers) opt for the Magtech. We keep the ESL amp in our line-up because it costs less than a Magtech and so represents a tremendous value. So those customers for whom money is a major concern, use the ESL amp instead of the Magtech.
In summary, the Magtech amp is the best for all speakers because it not only has the electrostatic amplifier modules, but it also includes a regulated power supply. So unless money is a major concern where the value of the ESL amp is essential, Roger recommends the Magtech.