Quadral AURUM VIII - Manual (Page 7)

Midrange switch +2dB/neutral/-2dB
High range switch +2dB/neutral/-2dB
The quadral company assumes no responsibility for any damage to the amplifier!
Midrange switch (MID)
minus 2dB
This lowers the volume in the listening area. In hall-like spaces, this can eliminate
some midrange penetration. However, this switch setting can also simply be used
as a matter of taste.
plus 2dB
The midrange plus 2dB setting makes the fundamental tone range a bit warmer. For
rooms with selectively heavy insulation, this can make the sound altogether more
balanced and warmer.
High range switch (HIGH)
minus 2dB
This switch setting makes sense in very hall-like rooms or at high listening volumes,
because the frequency response in the high range is adjusted to the hearing curve
at higher volumes.
plus 2dB
In the high range, plus 2dB means an overall higher tonal level. This is worthwhile
for very heavily insulated rooms and for everyone who wants to hear a bit more
“analytically”. It can be a special advantage when enjoying soft music, because the
frequency-response curve is adjusted to hearing at a low level.
Beware of clipping!
Even if an amplifier’s nominal output is significantly lower than the rated power-
handling capacity of the speakers connected to it, there is still every possibility that
the speakers might be damaged if not used correctly. The nominal output quoted
merely indicates the number of watts the amplifier is capable of delivering to the
speakers with low distortion. If an amplifier is overloaded it delivers far more power
on the one hand while adding destructive direct current as well as high-frequency
oscillation on the other. This process is known as clipping and negatively affects the
sound through severe distortion in loud passages of music. When distortion becomes
audible you should turn the volume down straight away to avoid damaging the
speakers. Amp-clipping is a typical indication of overloading and always occurs
when the volume and/or tone controls is/are turned up too high. Even when the
tone controls are set in neutral (12 o’clock) position, conventional amps already
reach their limits when subject to loud impulses as soon as the volume control is
turned well beyond the 12 o’clock position.
Care of your loudspeakers
Your AURUM loudspeakers are best cleaned with a soft, dry cloth. Do not use solvents.
You should only clean the loudspeaker systems (woofer, midrange units) when they
have become very dirty (small amounts of dust have no effect on the acoustics).
Use a soft, dry cloth or a soft brush with very gentle pressure, otherwise there is a risk
of damaging the diaphragms.
We strongly advise against cleaning the ribbon tweeter, because this special
transducer reacts with extreme sensitivity to compressed air and drafts and may
be damaged. Therefore the ribbon tweeter must never be cleaned with a vacuum
cleaner. The front opening must also not be blown off!
We accept no liability for improper cleaning of the speaker.