Gilderfluke&Co Amp-50 User Manual
Gilderfluke & Co.• 205 South Flower Street • Burbank, California 91502 • 818/840–9484 • 800/776–5972 • fax 818/840–9485
Amp-50
Gilderfluke & Company
Burbank, California
Left Right
Line In Line In VolumeVolume
Right Left
12-24 vdc
Power
(4Ω to 8Ω)
Speakers
Line Level
Source
Amp-50
Gilderfluke & Company
Burbank, California
Left Right
Line In Line In VolumeVolume
Right Left
12-24 vdc
Power
(4Ω to 8Ω)
Speakers
Line Level
Source
East Coast/Florida Office • 7041 Grand National Drive • Suite 128d • Orlando, Fl. 32819 • 407/354–5954 • fax 407/354–5955
Amp-50 Configuration & Installation
Before the Amp-50 can be used, you will need to attach speakers, power supply and a line
level audio source.
Speaker Outputs:
The Amp-50 is a ‘ClassD’ design. Its efficiency is
near 90%. If you feed 50
Watts of 24 vdc into the
Amp-50’s amplifier, you
will get almost 50 Watts
into your speakers. ‘Linear’ amplifiers have only
about 20% efficiency.
Fully 80% of the power
you put into them goes
into the heatsink as waste
heat. A 50 Watt linear
amplifier would only feed
10 Watts of power into
your speakers, and 40
Watts into the heatsink.
This makes the Amp-
50’s amplifier roughly
equivalent to what
would be a 200 Watt
linear amplifier!
If you are going to run
your speakers at high
SPLs, you will need to select speakers that can
handle at least a 100 Watts or more continuous
power. Smaller speakers may clip or be damaged if
run at too high an output power level from the Amp-
50.
The amplifier outputs from the Amp-50 can be used
with speakers of four to eight ohms impedance. As
with any amplifier, you can series/parallel any number of speakers, so long as the impedance remains
within limits.
The Amp-50 is well protected from short circuits and
overheating. You can stick a screwdriver right
across the speaker terminals! The Amp-50 will go
back to work a moment after a fault is removed. If
the speaker impedance is too low and you are running at a high volume level, the amplifier may start
to cut out. If you hear this, check the power supply
voltage. If the input voltage is dropping, you might
simply be drawing too much power for the power
supply and a larger supply may fix your problem. If
the power supply is OK, and you can’t increase the
speaker impedance, then you might simply be asking too much of the Amp-50’s amplifier, and need to
turn down the volume a tad.
To comply with FCC and CE standards for radio frequency emissions, you should use conduit or
shielded speaker wires with the Amp-50. The shield
should be attached to the power supply ‘negative’
terminal, which is immediately adjacent to the
speaker terminals. Shielding the speaker lines will
not affect the sound quality from the Amp-50, but
will make the FCC and CE folks happy. Shielded
speaker lines were used during all CE/FCC certification testing.
Bridged Amplifier: If you need
a mono output with more
‘oomph’, the Amp-50 can be
‘bridged’. Bridging will
only have an effect with
lower impedance speakers You won’t hear a bit
of difference if you are
using an eight ohm
speaker. The only audio
which is amplified comes
from the ‘left’ input. The
wiring to ‘bridge’ the amplifier is a little different
than on a linear amplifier.
The speaker is wired in
parallel to both right and
left speaker outputs, and
the jumper inside the Amp-
50 is moved to the ‘bridged’ position. Wiring the speakers for a
‘bridged’ output without moving this
jumper can damage
the Amp-50.
page 1 of 3 • © February 9, 2007 Gilderfluke & Co. DCM
Gilderfluke & Co.• 205 South Flower Street • Burbank, California 91502 • 818/840–9484 • 800/776–5972 • fax 818/840–9485
2.75"
2.00"
1.30"
Amp-50
Gilderfluke & Company
Burbank, California
Left Right
Line In Line In VolumeVolume
Right Left
12-24 vdc
Power
(4Ω to 8Ω)
Speakers
This devic e complies with Part 15 of t he FCC rules .
Operation is subject to the f ollowing two conditions: (1) This
device may not caus e harmful interferenc e and (2) this
device mus t accept any interf erence received, including
interferenc e that may cause undesired operation.
This Class B digital apparatus meets all
requirements of the Canadian Int erference-
Causing Equipment Regulations .
Cet appareil numerique de la classe B respecte
toutes les exigenc es du Reglement sur le materiel
brouilleur du Canada.
East Coast/Florida Office • 7041 Grand National Drive • Suite 128d • Orlando, Fl. 32819 • 407/354–5954 • fax 407/354–5955
Line Level Inputs:
Two RCA line level inputs are available on the Amp50s. A line level audio signal from a Sd-10 audio re-
peater, pre-amplified microphone, CD player, Video
projector, or any other line-level audio source can be
plugged into these two RCA jacks. Two trimpots can
be used to adjust the levels of the mixer inputs.
Power Supply:
The Amp-50 will run on any voltage from 12 through
24 vdc. Size your power supply so it will provide
enough current for the volume you are planning to
run at. The amplifier will put out more power at 24
volts than it can at a lower voltage. If using all 50
Watts of the amplifier power, you will need to use a
24 volt supply rated at least 60 Watts. If you hear
clipping, the speakers or power supply may be undersized for your application.
The power supply can be attached through the 2.1
mm power jack, or the screw terminals. Power Supply voltages higher than 24 vdc can damage the
amplifier on the Amp-50.
Volume Controls:
A pair of small trimpots on the Amp-50 are used to
set the audio output level. You can adjust these pots
using a small ‘trimmer’ screwdriver.
These trimpots are smaller than you. Do not
big screwdriver on them. Do not
apply too much
use a
force. They will break!
Amp-50 Installation:
The Amp-50 can be mounted using two screws;
DIN rail adapters; 2–3/4” Augat ‘Snap-Track’ (which
itself can be DIN rail mounted using DIN rail adapters); or just Velcro’d down. In many applications, the
Amp-50 can be attached on (or in) the speakers it is
feeding. The Amp-50 must not be mounted where it
might get wet, or suffer from extremes of temperature.
Unless the amplifier is being run at extreme output
levels, the Amp-50 will generate very little heat. Attaching it to something metal will allow it to dissipate
what little heat it does generate.
page 2 of 3 • © February 9, 2007 Gilderfluke & Co. DCM
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