AER Basscube Operating Instructions Manual page 4

Basscube
how varied the problem is and why we followed
radically different paths when we set out to realise
our tone ideas in order to make the bass sound the
way it wants to sound.
• A controlled switched mode power supply clocked
to 200 kHz supplies the 350 watts/8 Ohm bass pow-
er amplifier with adequate constant voltage, inde-
pendant from the load current. Its efficiency is ex-
ceptionally high. Among other things, this makes it
possible to provide this degree of performance in
such a small cabinet without causing thermal prob-
lems.
• The analogous signal processor monitors the sig-
nal so that full power-amplifier performance can be
called upon without the "headroom" that would
normally be necessary. That saves space and weight,
is gentle to the loudspeaker and provides for con-
stant and definite conditions in the power amplifi-
er. Since a "closed system" (power amplifier, proces-
sor and loudspeaker) is at issue, it is possible to match
all components involved optimally, thus ensuring a
maximum of effectiveness without overstraining the
system. We approach the limits without exceeding
them.
• We chose a 12" B&C die-cast long-stroke speaker.
This 12" loudspeaker is particularly suitable for bass
reproduction in small bass-reflex cabinets. Repro-
duction characteristics, capacity and efficiency are
interrelated in such a manner that special bass speak-
ers are always somewhat softer (by about 3 dB) than
universal speakers. The speaker has been subjected
to electrical and mechanical testing according to AES
(Audio Engineering Society) standards.
• The cabinet must withstand enormous strains. It it
made of 18 mm birch multiplex (13 ply) and is
grooved and glued with waterproof glue. The loud-
speaker is contained in a bass-reflex chamber sepa-
rate from the electronic unit so that everything is
mechanically decoupled.
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• The BASSCUBE is "two-way-active", that is, there
is an additional dome tweeter with active frequen-
cy crossover and its own power amplifier with 60
watts to 8 ohm. The tweeter is mounted on a mul-
tiplex traverse in the middle of the 12" bass loud-
speaker (coaxial construction). The
"combo-amplifier" is hence a full-range 2-way ac-
tive speaker system with audio quality.
• Furthermore, the BASSCUBE is constructed with 3
channels (supplemented by Aux-in). This makes com-
plicated set-ups using a piezoelectric pick-up, mag-
netic pick-up and microphone, all linked to one am-
plifier, through which you can also sing.
• Further features include:
- 48 V phantom source for a microphone
- 9 V phantom source for bass electronics (through
a stereo cable)
- FX-loop, mono, parallel
- Notch filter with adjustable cut and frequency
- switchable compressor
- variable DI-out to XLR
- line-out, tuner-out, headphones-out
- footswitch (FX-loop on/off)
- variable tape-in (RCA phono plug)
- active subwoofer out
- passive ext. speaker out
- groundlift & voltage select
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