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Built-in digital amplifiers, switching mode power supply

Superior mains efficiency.

Advanced signalprocessing with Fletcher Munson Compensation

Simply switch from Normal mode to 3 preprogrammed Cardioid modes

Also usable as stand-alone cardioid sub

High acoustic output, compact size

usable stack-height for D-Top1 or D-Top2

Fully compatible and combinable with all other D-Sub models


Frequence range

Max SPL @ 1m


Active high output Low-Q Reflex sub
Double 18 inch, two chamber system
34-100 Hz
Digital, 2000W processor controlled, including
FMC-implementation + cardioid modes
138dB half space
(Calculated and confirmed in real life measurement using a pink noise burst)
HxBxD=120x55x65cm (netto; without castor wheels)
100mm castor wheels
Extra handles, M20 screw adapter for D-Top2

A 4-fold DIP switch offers easy access to several parameters:

DIP-switches 1 and 2 are used to switch between normal mode and three different cardioid modes.

And as usual, DIP 3 and 4 can be used to reduce input sensitivity by 3, 6, or 9dB.

The D-Sub2c , designed for bass reproduction in conjunction with D-Top2 and D-Top1, uses two highly efficient 18 inch woofers with optimized voice coil cooling, thus raising long term power capacity and reducing thermal compression to a mere 2 dB.

The state of the art integrated two channel switching mode amplifier provides massive power at about 95% efficiency. This means an energy loss of only 100 watts at 2000 watts output.
Advantage: No thermal issues and superior mains efficiency. Only 6A mains current draw @ max power.
(=averaged musical program value, short bursts may show conciderably higher values)
This means a complete Control system may be driven to max power on only a 16 ampere /230V mains supply.

Our smart processing ensures safe operating conditions for the drivers. Additionally, level dependant Fletcher Munson compensating bass processing is performed to achieve best performance at all sound levels.

The low tuned, double chamber Low-Q bassrelex enclosure ensures excellent overall efficiciency and opens the possibility to drive both speakers in a different manner.
Therefore, a D-Sub2c can be used as a stand-alone sidefire cardioid bass system. More information on that below:

Cardioid Settings:

This DIP switch schematic is on the sub's amplifier.
Normal mode needs no explanation, the additional three modes are explained below.

In cardioid clusters, all subs need to have the same DIP 3 and 4 settings, except in case of the single Frontfire setup.

Note that Cardioid clusters need space around them, at least half the sub's width.
In any setup, low reduction behind the cluster is always better when reflecting walls and objects are farther away.
In small venues for example, wall reflections partly fill in the reduction zones, so full reduction can't be achieved.
In an open air setup however, full cardiod reduction is fairly easy to achieve.

Sidefire Cardioid:

A D-Sub2c lying on its side or simply standing on its back castor wheels can produce a front to back ratio between 16 up to 26dB.

Using a second D-Sub2c one could build a cardioid corridor with identical front to back ratio.
Spacing betwee both subs should be at least the depth of one sub (=65cm front to front).
But tightly together, standing on the back wheels does a great job as well.
Note that the top speaker of the sub is always the rear speaker in a sidefire setup.
So, a standing sub should be pulled backwards onto its wheels to put it at work as a sidefire sub.

Frontfire Cardioid:

The D-Sub2c can also form a cardioid cluster together with one or two normal subs:
With one D-Sub2c at some distance behind one or two normal subs a front to back ratio of 19 up to 27dB can easily be achieved.

Space between the front subs and the D-Sub2c should be the depth of a sub (=65cm).
So the cardioid sub is 2x 65cm = 130cm farther to the back compared to the front subs.
The configuration with two front subs is technically the best, both for front output as well as rear suppression.
The anti-sound from the back sub adds in phase to the front giving an extra 2,5 dB gain.
Attention: In a Frontfire cluster using a single front sub, the rear sub should be set to -6dB sensitivity reduction (DIP4 on)

Backfire Cardioid:

In this third configuration the D-Sub2c lies on its side, speakers pointing to the back.
On top of that we put two normal mode subs. This way we achieve a front to back ratio of 10 up to 22dB.
For the lowest frequencies this is the least favorable setup because the bass ports of the front and rear subs are relatively close together.
This results in a compromise between less rear reduction or less front output.

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