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Preset selection

The FusionAmp can store up to three presets, each
containing:

Source

Filter

Gain offset

Clip mode

These presets can be conﬁgured in HFD. The presets
ﬁlter, gain and clip mode are static and can only be
conﬁgured in HFD. The ﬁlter of the speciﬁc presets can
be speciﬁcally designed for e.g. audiophile listening,
party  or  any  other  purpose.  Source  selection  is
dynamic  and  stores  the  last  selected  source  in
memory  of  the  selected  preset.  If  another  preset  is
selected, the source is switched to the particular input
of  that  preset.  Master  volume  stays  equal  while
switching  presets,  gain-offset  is  added,  if  this  is
conﬁgured in the preset.

Hypex Filter Design (HFD)

HFD is a free software tool needed to conﬁgure the
FusionAmp. To protect your valuable drivers, the DSP
does not contain a ﬁlter out of the box. One must ﬁrst
conﬁgure a ﬁlter before the FusionAmp generates an
output signal.

HFD can be used to measure the frequency response
of the speaker and this information can be used to
design your ﬁlter. 15 biquad ﬁlters are available per
ampliﬁer channel.

A more elaborate guide is available on our website, to
guide you to a fully conﬁgured FusionAmp.

The most recent version of HFD is available for
download on our website or, if you would like a
physical copy, add a CD to your order.

Thermal protection

All ampliﬁers produce heat, even highly efﬁcient Class
D ampliﬁers. Therefore, the FusionAmp has an
internal thermal protection.

#   Thermal limiting
If the ampliﬁer is reaching its maximum temperature,
the output is lowered by 6dB. Additionally the protect
indication starts blinking once every second.
#   Thermal shutdown
If the maximum temperature is reached, the ampliﬁer
is switched off to protect it from damage. Additionally
the  protect  indication  starts  blinking  twice  every
second.

When the ampliﬁer has cooled down to a safe
operating temperature, the thermal protection resets
and the FusionAmp resumes to normal operation.

Te prevent overheating, install the FusionAmp
according to the installation instruction. Never cover
the ventilation holes or place the FusionAmp near a
heat source.

Gain and volume

The FusionAmp has an advanced gain structure. First
of  all,  we  distinguish  a  master  gain  (referred  to  as
‘volume’). This volume can be adjusted with HFD, via
the remote link, or with the Hypex remote.
Secondly,  each  FusionAmp  as  a  whole,  can  have  an
offset to the master volume.
Thirdly, each ﬁlter can have an offset to this volume.
This can be used to match less sensitive woofers with
more sensitive woofers.
Finally,  the  one-way  models  have  a  manual  gain
offset,  since  these  models  are  meant  for  use  as  a
subwoofer, one might want to ad a little extra punch at
a certain moment.

To prevent the FusionAmp to power up at maximum
volume, an optional startup volume (master) can be
conﬁgured in HFD.

Input sensitivity

Since different FusionAmp models have different
output power, the gain is adjusted in the DSP to make
sure dBFS equals full power output. This also applies
to the analogue inputs.

Filter protection

The presets loaded in the FusionAmp can be password
protected,  so  that  unauthorized  persons  can  not
overwrite  the  conﬁguration.  This  feature  can  be
conﬁgured in HFD. Use this function with caution. If
you conﬁgure this function, you will be asked to enter
an  email  address.  This  address  is  stored  in  the
FusionAmp’s  memory.  If  you  lost  your  password,  a
reset code can be requested and will be send to this
email address.

Features

Fan control

The  FA502  and  FA503  feature  an  advanced  cooling
system. The software monitors the signal input and
module  temperature.  A  proportional–integral
algorithm  controls  the  fan  speed.  This  ensures
sufﬁcient  cooling  when  needed  and  quiet  operation
when desired.

Source select

Automatic  source  select  automatically  locks  to  the
ﬁrst available source. The input scanner scans in the
following order and loops:
#   One-way models:
XLR | RCA | High Level Input
#   Multi-way models:
AES | S/PDIF | Optical | XLR | RCA.

The source can also be selected manually. Conﬁgure
manual or automatic source selection in HFD.

Daisy-chaining

The balanced analogue input can be daisy chained
using the XLR through connector. This output XLR is
directly connected to the input XLR. The maximum
number of chained modules is limited by the source’s
capabilities.

Multi way versions:
The  FusionAmp  can  also  be  daisy  chained  in  the
digital  domain.  The  signal  on  the  AES  and  S/PDIF
output  is  the  signal  of  the  current  selected  digital
input.

Note: there is no link between analogue and digital
domains. Analogue input signal can not be routed to
digital output and vise versa.

Signal detect

Instead of a trigger input, the FusionAmp features a
signal detect function. Depending on the selected
power mode (explained next), the FusionAmp scans
for input signal and enables if it detects or locks on to a
signal. Signal detect can be conﬁgured in HFD.

Auto-shutdown

In addition to signal detect, the FusionAmp can
automatically switch off if there is no input detected
on any of the inputs conﬁgured with signal detect.
This feature can be conﬁgured in HFD.

AES

S/PDIF

Optical

AES

S/PDIF

source

select

Power modes

#   Ultra-low power
Meets  2013  ERP  Lot  6  0.5W.  In  this  mode  the
FusionAmp  scans  for  analogue  input  only.  If  an
analogue  input  signal  is  detected,  the  FusionAmp
automatically turns on.
Power usage: 410mW

(preliminary)

# Low power
In addition to ultra-low power mode, which only scans
for analogue input, this mode also scans the digital
inputs for signal. Multi-way only.
Power usage: 750mW

(preliminary)

# Wake up on line
In this mode, the FusionAmp is always on, when
connected to mains.

In ultra-low or low power mode, the FusionAmp can
also be enabled by pressing the select button or via the
optional Hypex Remote. Power modes can be
conﬁgured in HFD.

Bridge-tied load

The multi-way Fusion Amp can be conﬁgured for BTL.
BTL allows two ampliﬁers to be combined to double
the output power. This features can be conﬁgured in
HFD. Speaker connection must be done according to
the description in chapter: installation.

Soft-clip

Soft-clip minimizes audible distortion if the ampliﬁer
is over-driven. By default, the FusionAmp DSP has
soft-clip enabled, to protect the ampliﬁer from
clipping.

Every limiter has its effect on audio quality. For
optimal sound quality, one may want to disable this
feature. If soft-clip is disabled, the hardware clipping
takes over.

If the FusionAmp is driven into clipping (soft or hard)
the protect indicator lights up. Hardware clipping
only indicates when the ampliﬁers are over driven. It
does not protect the ampliﬁer, nor your speakers.

Soft-clip  can  be  conﬁgured  using  HFD.  To  correctly
conﬁgure  soft-clip,  the  speaker  impedance  and
maximum output power parameters need to be set. By
default,  soft-clip  is  conﬁgured  to  deliver  maximum
power into 4

load impedance.

Critical failure

If a critical failure is detected, i.e. a DC error, the amp
shuts down immediately and the protect indication
will be enabled. A critical error is latching, meaning
only a power cycle might solve the issue. If a power
cycle does not work, contact Hypex support.