Active Speaker Abacus A-box 10

The abacus box 10 (1190 euro / pair) is a Studio box for use at home. It combines the finest resolution with gloriously colorful sounds.

  1. Active speaker abacus A-box 10
  2. Data sheet

The abacus Rieder amplifier among the small, but very ambitious manufacture products in Germany, which brought it to the status of the tips in the scene 25 years ago.

Just this manufacturer is today more focused on active speakers. Company founder Karl-Heinz special combined with his abacus A box 10 the advantages of direct coupling amplifier and chassis with the possibilities of the digital switch and filter technology. So he succeeds, only 10 litre small, closed A-box 10-26 Hertz on down linearly to equalize.

Parallel to the wall or slightly bend. Make sure that the place to the side. Wall close draft on approx. 60 Hz, free also, then goes with something slim bass.

Because this requires long strokes to the paper, coated 17-Cone in the linearity, the draught via controller can be meaningfully limit. In the high-frequency plays a single inch dome with silk membrane. Special value sets special amplifier technology: he called Transconductance amplifier its amplifiers — they should allow a strong negative feedback without sound malicious false rules and better control the chassis.


The abacus box 10 shows excellent values of neutrality, where she scores thanks to their digital equalization with an incredible lower limiting frequency of 26 Hz in closed volume. This is of course at the expense of the sound pressure – their draught can be regulated but, only a few Hz waiver already significantly increases the feasible maximum levels. The switch for the subwoofer can be used in positions about 100 Hz.

No contradictions

Sober Studio monitor or nice-sounding Hi-Fi box? The abacus box 10 is both: despite a finely resolved representation of the final II of Wagner’s “Lohengrin” (Bychkov) she are wooing the ears with colorful sounds. Stage projected them in, similar to a 3D image, very natural.

Surprise in the bass: the sparkling double bass runs in Jacques Loussier “play Bach” (Telarc) she followed with the accuracy of a precision instrument and shaped to the bass drum as dry as we know it only by sensor-controlled bass. At most dynamically performs no miracles little, makes them relatively quickly in the deep bass at higher levels.

Whether this is relevant for practice, must decide the music taste: with classical music, folk, and not to hard Jazz is you will never experience this limit – and enjoys one of the most accurate and yet most beautiful voice boxes, AUDIO has tested so far for this. And who want to hear loud (what works), an additional subwoofer is recommended.

Abacus-A-box 10

Manufacturer Abacus
Price €1200.00
Rating 82.0 points
Test procedure 1.0

Technical data and test results

General data
Dimensions (W x H x D) 21.0 x 35.0 x 21.0 cm
Weight 6.5
Surfaces Veneer
Color Black, white
Technical characteristics
Bass principle Two-way bass reflex
Number of ways 2
Working principle of full Active
XLR connectors
Space adaptation Draft regulator
Surround complementary.
Laboratory characteristics
Maximum volume upper value 89 dB
lower cut-off frequency (-3dB) 34 Hz
Lower cut-off frequency (-6 dB) 26 Hz
Nominal impedance (audio)
Very neutral, soft laid-back monitor with great figure, draught and sensational precise timing.
Very limited level, bass rather slim as punchy.
Bass quality 80
Bass depth (bass Foundation) 90
Attention to detail (precision) 95
Dynamic 65
Maximum level (vitality) 45
Neutrality 95
Imaging 75
Spatial (airiness) 85
Processing Very good
Sound judgment very good 82
tested in issue: 3 / 11


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