Specifications

Preserve Source/Tube Saturation

There are four possible states of the two Preserve Source buttons.

Here’s what each does (o =LED lit):

1) Preserve Source: Treble O Bass O

With neither button pressed, frequency splitting does not take place

and the AMM-1 operates in its normal manner according to the

settings in the Source and Modeled Mic sections.

2) Preserve Source: Treble O Bass o

With the Bass button pressed, the source mic’s bass characteristics

are allowed through unchanged while the treble characteristics are

neutralized. Then, at the model end, only the model’s treble charac-

teristics are applied to the signal. The net effect is that you get the

source mic’s bass characteristics and the modeled mic’s treble charac-

teristics.

3) Preserve Source: Treble o Bass O

This, as you’ve probably guessed, is the reverse of no. 2. With the

Treble button pressed, the source mic’s bass characteristics are

neutralized while the treble characteristics are allowed through

unchanged. Then, at the model end, only the model’s bass charac-

teristics are applied to the signal. The net effect is that you get the

source mic’s treble characteristics and the modeled mic’s bass charac-

teristics

4) Preserve Source: Treble o Bass o

With both buttons pressed, both the source’s bass and treble charac-

teristics are allowed through unchanged and no model is applied to

either range. This is equivalent to selecting Bypass for both the

Source Mic and Modeled Mic, with the exception that the Proximity

controls for both the source and modeled mics remain active.

Tube Saturation

The Tube Saturation section is designed to model the distortion that

is typical of a high-quality tube pre-amp.

When tube pre-amps are operated in their linear range, there is

virtually no signal distortion and their audio qualities are essentially

identical to solid state pre-amps. However, it commonly occurs that

transients exceed the linear voltage range, resulting in distortion.

The distortion characteristics of a vacuum tube pre-amp is vastly

different than that of solid state amplifiers and is often described as

adding a certain “warmth” to a sound (in contrast to what is often

described as the “brittleness” of the solid state sound).