Hevos 400S Head



Categorie: ,


400S is an ultra-light amplifier with a total weight of 2 kgs. Suitable for both electric and acoustic basses. Thanks to the application of the newest technics, the 400S is completely quiet, even at full power. The class-D technology takes care of the absence of heat dissipation, resulting in a very compact design.

It’s an amplifier with a continuous power of 400 Watts. Separate gain controls for both inputs. This allows to connect two electric basses at the same time, or in case of an acoustic – 2 pickups. The LED above input 1 is a clip indicator, turning from green into red as soon as the signal is too high.

The first input has a -6 dB switch to reduce sensibility if necessary. This could be the case while using an active bass guitar or a double bass with a separate preamp. The use of a separate preamp for acoustic piezo pickups is not necessary though. Input 1 is also provided with a phase turn switch, allowing to connect an acoustic bass with two different pickups. Setting one pickup out of phase results in a differend sound.

400S is also equipped with a mute out. The internal signal is interrupted and will be available at the mute out to be sent to a tuning gear. The equalizer is a 4-band with frequency ranges at 80, 250, 800 and 2500 Hz (+/- 12 dB). In normal acoustic circumstances the use of the tone unit won’t be necessary.

At the back it’s equipped with 2 Speakon loudspeaker outputs, a headphone output and a symmetrical line out with a pre/post switch. The pre/post switch controls the source of the line out signal.

The loudspeaker output has a minimal load of 4 Ohms , making it possible to connect two cabinets at 8 Ohms each. Controllable headphone output. Built-in start delay and protected against short circuit and clipping. The 400S is powered by a class-D power amplifier with UcD technics, resulting in an extremely stable and noiseless performance. The high efficiency of the class-D power amp makes any cooling redundant.

Type: transistor class-D, high-end
Power: 400 Watts/4 Ohms
Damping: >2000/1 kHz/4 Ohms
Inputs: 2x, independent gain
Tone control: 4 band active
Protection: short circuit, open output, DC-protection output, temperature protection, mismatch, clip, delayed switch on
Divers: mute-out, headphone output, -6 dB switch, phase turn switch, symmetrical line-out with pre-post switch
Output: 2x Speakon
Weight: 2 kg
Dimensions (HxWxD): 8x23x20 cm