ADAM Audio Center Semi-active Version - Handbuch (Seite 10)

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4.4 Impedance linearization (for tube amplifiers)
The semi-active Tensor Center 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.
4.5 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.
4.6 Bass Gain
The ‘Bass Gain ‘ raises or lowers the overall bass level up to +/-3 dB.
4.7 Parametric Bass Equalizer
The acoustic properties of specific rooms may cause problems with
authentic reproduction of music (see 3.1). 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 stan-
ding wave typically occurs at approximately 28 Hz, meaning that this tone
sounds overemphasized and droning. Using the parametric equalizer pro-
perly, 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.
4. Speaker Adjustment