Safety instructions
1. This amplifier is supplied with ~230V or ~115V. Connect
the amplifier exclusively to a power point with earth
connection. Never open the amplifier. Repairs are
exclusively done by Hevos and by companies that have
been authorized by Hevos. Otherwise the warranty will
become void.
2. The amplifier should not be used outdoors. Avoid
exceptionally warm places, places that are dusty or dirty
and places of high humidity .
3. If the power cable is damaged, the amplifier has been
dropped or the amplifier is not working correctly
immediately switch off the amplifier and disconnect it
from the power point. The amplifier should be repaired
by an by Hevos or authorized company only.
4. Never pull out the plug by the cable.
5. For cleaning, only use a dry soft cloth. Never use any
water or chemicals.
6. In case of illicit or wrong use, wrong connection, wrong
control or repair by a non-authorized company or person
the warranty will become void as well.
7. Whenever you want to dispose of the amplifier, hand it in
at your local recycling company.
8. Never connect the Line Out to a mixing desk with
Phantom Power switched on. This can cause amplifier
malfunction or even damage.
Introduction
The 400S is a high-end transistor amplifier with a continues
power of 400 Watts. The 2 inputs have separate gain
controls. The led above input 1 is a clip indicator which turns
from green into red as soon as the input signal is too high. If
so, one should reduce the input signal by lowering the
volume of the instrument or the input gain at the amplifier.
Input 1 has a –6dB switch to reduce sensibility if necessary.
This could be the case by using an active bass guitar or double
bass with separate pre-amp. If the clip indicator turns into red
often, one should turn back gain or put the switch to –6 dB.
The –6 dB switch is also useful to connect both an active and
passive bass at the same time. If both basses have a similar
output, the switch should be set to 0 dB.
Input 1 is provided with a phase turn switch, which can be
useful connecting a double bass with two different pick ups.
By means of the switch one puts one pick up out of phase,
resulting in a different sound.
The pre amp is also equipped with a Mute Out to tune the
instrument soundlessly. By means of the Mute Out switch
one can activate the Mute Out. The internal signal is then
interrupted and will be available at the Mute Out to be sent
to a tuning gear.
The tone control unit is a 4-band type and is very easy to use.
The frequencies are 80, 250, 800 and 2500 Hz , +/- 12 dB
logarithmic. The amplifier has been built in such a way that in
normal acoustic circumstances there will be no need to use
the tone control.
At the back are 2 Loudspeaker outputs, a Headphone output
and a symmetrical Line Out with pre/post switch. The
pre/post switch controls the point in the amplifier circuit
where the line out signal comes from. Never connect the
Line Out to a mixing desk with Phantom Power switched on.
This can cause amplifier malfunction or even damage.
The loudspeaker output has a minimal load of 4 Ohms.
The headphone can be controlled by means of the gain and
master knob.
The 400S has a built-in delay and is protected against short
circuit and clipping. It is powered by a class-D power
amplifier, resulting in extremely stable behaviour. The high
efficiency of the class-D power amp makes any forced cooling
redundant.
Installation directions for use
1. Connect the amplifier exclusively to a power-point with
earth pin.
2. When you connect or disconnect your bass, take care
the Gain knob is put to 0 or use the Mute switch to
avoid switch clicks.
3. In order to set a distortion-free amplification it is
advised to set the Gain in such a way that the clip
indicator does not turn into red. Control the output
volume by turning the Master knob.
4. Under normal acoustical circumstances there is no need
to use the tone controls. However, if one should use the
tone controls, it is advised to do so carefully. Each tone
control goes up to +12/-12 dB. The sensitivity increases
while turning the knob clockwise and anticlockwise.
5. The minimal output impedance of the 400S amplifier is
4 Ohms. This means that you can connect 2 cabinets of
8 Ohms each to the amplifier, or 1 cabinet of 4 Ohms.
Connecting 1 cabinet of 8 Ohms to the amplifier is also
o.k. but will reduce the maximum output power to
about 270 Watts.
6. Only use loudspeaker cables of excellent quality and
Neutrik Speakon loudspeaker connectors.
Control panel front
1. –6dB switch: reduces the sensibility of Input 1
2. Phase turn switch: puts one pick up out of phase when
using 2 pick ups (double bass) and both inputs.
3. Input 1
4. Gain Input 1: controls the signal amplitude towards the
pre amp.
5. Input 2
6. Gain Input 2: controls the signal amplitude towards the
pre amp.
7. Mute switch: activates the Mute-Out at the back.
8. Low: tone control 80 Hz, ± 12 dB, Q = 0,5
9. Low-Mid: tone control 250 Hz, ± 12 dB, Q = 0,5
10. Mid-High: tone control 800 Hz, ± 12 dB, Q = 0,5
11. High: tone control >2500 Hz, ± 12 dB, Q = 0,5
12. Master: controls the signal amplitude to the power
amp.
13. On/Clip led: green at power-on. Red when the input
signal is too high.
14. Led Mute-Out
Control panel back
1. Loudspeaker outputs (parallel connected): to connect
loudspeakers cabinets with a minimal total impedance of 4
Ohms. So you can connect 2 cabinets of 8 Ohms each to the
amplifier, or 1 cabinet of 4 Ohms. Connecting 1 cabinet of 8
Ohms to the amplifier is also o.k. but will reduce the
maximum output power to about 270 Watts.
2. Line-out: symmetrical XLR-output to PA/mixing console.
3. Pre/post switch: taps the line out signal from Gain or
Master position.
4. Headphone output
5. Mute-Out: connector for tuning gear.
6. Ground Lift switch: cuts the earth between amplifier and
PA/mixing console if case of a ground loop.
7. Fuse compartment with fuse and spare fuse. The fuse box
can be opened with a small screw driver.
8. Power on/off switch
Technical features
Type: transistor/class-D MosFet bass amplifier
Power: 400 Watts into 4 Ohms, 1 kHz, < 0,01% distortion
Damping: > 2000 at 100 Hz in 4 Ohms
Input: 2x, both to be used independently.
Tone control: active, 4 band: 80, 250, 800, and >2500 Hz +/-
12 dB
Protection: short circuit, DC current on output, mismatch and
open end; clip indicator; delayed power switch.
Divers: Mute Out; symmetric Line Out with pre/post switch,
Headphone Out, Ground Lift.
Output: Loudspeaker (2x), Line Out, Mute Out, Headphone
Product warranty and service
This product is guaranteed against defects of used materials
and operation from the moment of purchase during a period
of one year. If during this warranty period this product does
not function properly, Hevos will fit the product to the use it is
intended for without passing on the costs of labour and
materials to the purchaser under the following strict
conditions:
1. The obligation of Hevos is restricted to the repair or
replacement of defects. Hevos is at liberty to decide
whether it should be repair or replacement. Transport
costs are at the purchaser’s expense. Hevos cannot be
held responsible for any kind of risk during transport (e.g.
loss, damage etc).
2. All repairs under warranty should be done by Hevos or a
company authorized by Hevos. Repairs by non-authorized
companies are no part of this warranty. If the product is
damaged due to non-authorized repairs then this
warranty will become void.
3. This warranty applies only for defects of used materials
and operation. The warranty does not apply for:
damage caused by lightning, induction, faulty power
supplies, faulty power cords, insufficient ventilation,
flooding, fire, smoke, peace disturbances hooliganism
and war.
damage caused by accidents, negligence,
modifications and wrong use or wrong installation or
wrong transport
products with illegible serial numbers or numbers
that have been tampered with
4. The warranty expires when the product is hired, lent or
sold to third parties.
5. Specifications and information contained in this manual
are furnished for informational use only, and are subject
to change at any time without notice and should not be
construed as a commitment by Hevos. Hevos assumes no
responsibility or liability for any errors inaccuracies that
may appear in this manual.
Panningen, Netherlands
Email: info@hevos.nl
URL: www.hevos.nl
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