ADAM Audio Gamma Semi-active Version - Handbuch (Seite 12)

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6.3 Impedance linearization (for tube amplifiers)
The semi-active Tensor Gamma was designed for you to be
able to use your own amplifier at bass-midrange, midrange
and high frequencies. Usually, this will be a transistor
amplifier that does not have any problems with the vacillating
impedance characteristics due to its low internal resistance.
With the output of a tube amplifier however, the situation is different. The sound
quality can be improved if the amp gets an impedance of 4 Ω or 8 Ω that stays
the same at all frequencies. That is why the semi-active Tensors feature built-in
impedance linearization that can be patched into the signal path.
6.4 Tweeter Level
In addition, the ‘Tweeter Level’ allows to either raise or lower
the high frequency level by 1,5 dB. Just insert the short circuit
plug in the accordant position: -1,5 dB to lower and +1,5 dB to
raise the high frequency level.
6.5 Parametric Bass Equalizer
The acoustic properties of specific rooms may cause problems
with authentic reproduction of music (see 5.1). Frequently
the bass is the ‘problem child’ in the attempt to create a
natural sound, producing a ‘standing wave’ – the overlapping
of two waves of the same frequency and phase spreading in
opposite directions. This results in local (at specific positions
in a room) imbalances of particular frequencies.
For example, in a room of 6 meters (20 feet) width and length,
a standing wave typically occurs at approximately 28 Hz, me-
aning that this tone sounds overemphasized and droning.
Using the parametric equalizer properly, a bass ‘overkill’ like
this can effectively be neutralized.
Furthermore, specific listening habits or preferences may
lead you to want to change the lower frequencies to either
emphasize or attenuate the bass. The parametric equalizer is
the perfect tool for this as well.
6. Speaker Adjustment