TAG MCLAREN AUDIO 700:7r Owner's Manual - T E C H N O L O Gy

t e c h n o l o gy

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An Optimal Mix of Global and Local Negative Feedback

The 700:7r gives excellent linearity and low distortion without relying on excessive global

negative feedback, which can present difficulties with stability and the handling of rapidly-

changing signals. The 700:7r design is implemented by giving each amplifying stage

controlled amounts of local feedback, which not only linearises it but also defines the gain

and other vital parameters closely. Each stage is thus configured for dependable and

predictable operation, so that when they are joined together to build a complete amplifier,

and a carefully chosen amount of negative feedback applied around it, the results are highly

dependable and predictable.

Cascode Compensation

The 700:7r uses an advanced loop stabilisation concept called Cascode Compensation. 

To the best of our knowledge TAG McLaren Audio is the only manufacturer to use this

sophisticated and elegant system in an audio amplifier.

Its advantages are as follows:

Excellent stability. All

the active components

involved are operated

under circuit conditions

that maximise their

bandwidth. This results

in greater stability

when the negative-

feedback loops are

closed.

Inherently good

supply-rail rejection.

Components that are

essential for power-

supply filtering in a

conventional amplifier

are no longer

required, saving

weight and cost and

enhancing reliability.

Reduction of DC drift. In a normal high-

power amplifier transistors in sensitive

parts of the circuitry get warm, which

means their characteristics vary depend-

ing on the air flow around them.

Variations in cooling can appear as DC

drift at the output. Cascode compensat-

ion transfers the heat dissipation to non-

critical parts of the circuit and DC drift

is virtually eliminated.

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