Proteus SW 2.5

High performance subwoofer amplifier for home cinema, hi-fi and high end


Proteus SW2.5 offers a huge number of features as well as high output power. Its design and quality of manufacturing are what you would expect from a high performance product belonging to our Proteus line.

- 220 W at 4 ohms / 130 W at 8 ohms
- subwoofer filter 3rd order, adjustable from 40 - 110Hz
- subwoofer phase adjustable from 0 - 270°
- bass boost adjustable in level 0 - 6dB and frequency 20 - 40Hz
- satellite filter 2nd order, adjustable from 40 - 110Hz
- subsonic filter 3rd order at 12 Hz
- bypass for subwoofer filter to drive unit from a surround decoder
- auto power on with power mode function
- blue power-on LED 
- AC socket and mains switch with real hardwired "off" position. 
- toroidal transformer for minimal interference
- input for external level control
- made in Germany

 

Applications

Two gold-plated cinch sockets are offered for the left and right outputs of a preamplifier. The satellite outputs will deliver a filtered signal adjustable in the 40Hz-110Hz range. It is also possible to employ an integrated amplifier that does not offer separate preamplifier outputs by connecting the Proteus SW2.5 directly to the loudspeaker outputs. The amplifier's output power should not exceed 2x100W on 4 ohms in this case. For the connection of the subwoofer driver, the SW2.5 comes packed with a set of slip-on connectors. 

Elegant design

The 4 mm aluminium front is brushed and anodised. Rounded corners allow the flush mounting of the SW 2.5 to give your subwoofer that factory-made, professional look. A new etching technology makes sure that the printing is protected against abrasion.

Fig.: Rear view of the  Proteus SW 2.5

 

Fig.: The toggle switches are fitted with chrome-plated levers, underlining the professional, high end appeal of this module. 

  

Fig.: The massive aluminium bar creates a huge cohesion pressure, optimizing thermical contact between the power transistors and the cooling element.

 

 

Fig.: All cinch sockets are gold-plated and the pots are fully enclosed in diecast aluminium, with multiple click-stops for convenient operation.


For the assembly of the SW2.5, we exclusively use bolts made from polished stainless steel (V2A).


SMD-Manufacturing Method

The Proteus SW2.5 electronics are manufactured using surface mounted devices (SMD). This technology allows a very high packing density of the component boards with shorter connecting tracks, which considerably improves on the performance.

Fig.: Input section of the SW2.5 in SMD technology, incorporating a completely symmetrical, double mono circuit layout for minimal crosstalk. 

 

Connectivity

The auto power on function automatically activates the subwoofer unit when an audio signal is present. With the power mode switch, you can deactivate auto power on, if you want to switch the unit manually. 

The internal subwoofer filters can be bypassed for use of the SW2.5 on a surround decoder's subwoofer output. All other functions are still active in this case. 

With the phasing control 0-270°, you can quickly and conveniently align the subwoofer's performance with the main speakers and room acoustics. 

Using the bass EQ, you can extend your subwoofer's deep bass response by boosting the lowest frequencies with additional power. Please keep in mind that a 6dB bass boost means four times the amplifier power! 

Since the SW 2.5 employs independant crossovers for subwoofer and satellites, it is possible to spread the crossover overlap further over the range.

Convenient level control

Use the optional level control to adjust the subwoofer's loudness conveniently from the front. 

 

 

Specifications

Proteus SW 2.5

- nominal power                              

220W at 4 ohms / 130W at 8 ohm
- damping factor 400 with 8 ohms load 

- noise

 - subwoofer amp: better than -92dB at full level
- satellite output: better than -101dB at 0 dBu
- crosstalk - better than -87dB at 1 kHz

- THD

 - subwoofer amp: better than 0.07% at 10 W / 8 ohms
- satellite output: better than 0.009% at 0 dBu
- input impedance - line-input: 10 kohms
- high power input: 2 kohms
- active crossover - subwoofer: 3rd order Butterworth, adjustable 40-110Hz
- satellite: 2nd order Butterworth, adjustable 40-110Hz
- subsonic: 3rd order Butterworth 12 Hz
  (all crossover points referenced to -6dB)
- subwoofer phase control 0-270°
- bass boost max. +6dB, center frequency adjustable 20-40Hz
- protection DC protection against supply failure
- power consumption 220V-240V/50Hz-60Hz, standby: 8 W, on: 260 W max , off: 0 W
- fuses primary: 3.15 A slow, secondary.: 2 x 3.15 A slow
- dimensions 360 mm x 175 mm (thickness of front 4mm)
- cutout dimensions 330mm x 150mm
- depth 115mm
- weight 3.6 kg

 

 

Note:
Each SW2.5 comes packed with a set of ten fastening screws, two plugs for the connection of the woofer and a mains cord. The external level control is available optionally. We recommend installing the SW2.5 in its own sub-enclosure.