ONKYO A-9155 A9155B Leaflet
Product codes
A9155B
A-9155
Integrated Amplifier
NPR No. 07N16 01/07
Printed in Japan
Discrete Output Stage Circuitry to
Inhibit Audio Interference
The output stage circuitry delivers current to your
loudspeakers.The current that makes the
loudspeaker move is driven by the output
transistors. Adding more transistors to the output
stage increases the output-current capability.
However, more transistors put a strain on the
power supply, as well as generating more heat.
When the output stage is required to deliver more
power than it is capable of, the top and bottom of
the waveform are flattened or “clipped.”This clipping
causes noticeable distortion, even though the
incidences are relatively few.The A-9155 actually
keeps the transistors separate at the output stage,
which means that clipping cannot interfere with
your audio signal. Also, with less heat generated, the
longevity of the output stage circuitry is preserved,
ensuring that the component can stand the test of
time.
Inhibit Audio Interference
The output stage circuitry delivers current to your
loudspeakers.The current that makes the
loudspeaker move is driven by the output
transistors. Adding more transistors to the output
stage increases the output-current capability.
However, more transistors put a strain on the
power supply, as well as generating more heat.
When the output stage is required to deliver more
power than it is capable of, the top and bottom of
the waveform are flattened or “clipped.”This clipping
causes noticeable distortion, even though the
incidences are relatively few.The A-9155 actually
keeps the transistors separate at the output stage,
which means that clipping cannot interfere with
your audio signal. Also, with less heat generated, the
longevity of the output stage circuitry is preserved,
ensuring that the component can stand the test of
time.
Power Supply to Enhance Musicality and
Support Loudspeakers
At the heart of every Onkyo amplifier, you’ll find a
power supply that can maintain or increase output
power as impedance falls. Musically, this means that
you have deep, powerful bass; wide-ranging
dynamics; musical peaks that sound composed; and
correct timbre and soundstaging. When paired with
relatively high-impedance loudspeakers, Onkyo
amplifiers have more than enough current capability
to drive them with ease. In the case of the A-9155,
you will find a capable power transformer and two
audiophile-grade capacitors (each with a capacitance
of 8,200 µF).The transformer and capacitors work
together to supply ample amounts of current to the
speakers.
Support Loudspeakers
At the heart of every Onkyo amplifier, you’ll find a
power supply that can maintain or increase output
power as impedance falls. Musically, this means that
you have deep, powerful bass; wide-ranging
dynamics; musical peaks that sound composed; and
correct timbre and soundstaging. When paired with
relatively high-impedance loudspeakers, Onkyo
amplifiers have more than enough current capability
to drive them with ease. In the case of the A-9155,
you will find a capable power transformer and two
audiophile-grade capacitors (each with a capacitance
of 8,200 µF).The transformer and capacitors work
together to supply ample amounts of current to the
speakers.
Optimum Gain Volume Circuitry to
Preserve Signal Purity
Conventional volume attenuation methods involve
initially dropping a signal close to the noise floor at
low volumes. Even though the signal is only tainted
with a little noise, the amount increases when the
signal is amplified. Onkyo’s Optimum Gain Volume
Circuitry adjusts the gain so that less than half the
amount of attenuation is necessary.This signal never
comes close to the noise floor, thus averting the
possibility of the noise found in conventional
volume-attenuation designs.
Preserve Signal Purity
Conventional volume attenuation methods involve
initially dropping a signal close to the noise floor at
low volumes. Even though the signal is only tainted
with a little noise, the amount increases when the
signal is amplified. Onkyo’s Optimum Gain Volume
Circuitry adjusts the gain so that less than half the
amount of attenuation is necessary.This signal never
comes close to the noise floor, thus averting the
possibility of the noise found in conventional
volume-attenuation designs.
SPECIFICATIONS
A
MPLIFIER
S
ECTION
Power Output
65 W/Ch (4
Ω
, 1 kHz, 2 channels driven, IEC)
Dynamic Power
90 W + 90 W (4
Ω
)
55 W + 55 W (8
Ω
)
Total Harmonic Distortion
0.08 % (1 kHz, 1 W)
Damping Factor
60 (1 kHz, 8
Ω
)
Input Sensitivity and Impedance
Phono MM
2.5 mV/50 k
Ω
LINE
150 mV/50 k
Ω
Output Level and Impedance
150 mV/2.2 k
Ω
(Rec Out)
Phono Overload
64 mV (MM, 1 kHz, 0.5%)
Frequency Response
10 Hz–100 kHz (+1, -3 dB, CD)
Tone Control
+10 dB, -10 dB, 100 Hz (Bass)
+10 dB, -10 dB, 10 kHz (Treble)
+8 dB, 100 Hz (Loudness)
+4 dB, 10 kHz (Loudness)
+10 dB, -10 dB, 10 kHz (Treble)
+8 dB, 100 Hz (Loudness)
+4 dB, 10 kHz (Loudness)
Signal-to-Noise Ratio
100 dB (CD, IHF-A), 70 dB (Phono, IHF-A)
Speaker Impedance
4
Ω
–16
Ω
G
ENERAL
Power Supply
AC 230 V, 50 Hz
Power Consumption
160 W
Standby Power Consumption
0.2 W
Dimensions (W x H x D) 435 x 121 x 344 mm
Weight
6.8 kg
Quality Construction for Quality Audio
An instrumental factor in any audio component is its
build quality. It’s not just about good looks; the build
quality of the electronic parts, chassis and
construction techniques combine to significantly
shape the outputted audio signal. The A-9155’s high-
rigidity, anti-resonant chassis is designed to isolate
the audio signal from any vibrations that may inflict
interference during the amplification process.This
chassis is superbly finished with an aluminum front
panel and volume control that accentuate the
quality of the construction throughout.
An instrumental factor in any audio component is its
build quality. It’s not just about good looks; the build
quality of the electronic parts, chassis and
construction techniques combine to significantly
shape the outputted audio signal. The A-9155’s high-
rigidity, anti-resonant chassis is designed to isolate
the audio signal from any vibrations that may inflict
interference during the amplification process.This
chassis is superbly finished with an aluminum front
panel and volume control that accentuate the
quality of the construction throughout.
iPod Playback Through Onkyo’s Remote
Interactive (RI) System
With Onkyo’s RI system, you can connect other
Onkyo components to the A-9155 and operate
them through a single remote control. RI capability
also gives you the opportunity to integrate the iPod
with the A-9155 through an Onkyo RI Dock for the
iPod.The latest RI Dock (the DS-A2) offers you
onscreen menus, remote control, recharging
capability and even photo/video playback.
Interactive (RI) System
With Onkyo’s RI system, you can connect other
Onkyo components to the A-9155 and operate
them through a single remote control. RI capability
also gives you the opportunity to integrate the iPod
with the A-9155 through an Onkyo RI Dock for the
iPod.The latest RI Dock (the DS-A2) offers you
onscreen menus, remote control, recharging
capability and even photo/video playback.
Due to a policy of continuous product improvement, Onkyo reserves the right to change specifications and appearance without notice. All other trademarks and registered trademarks are the property of their respective holders.
Onkyo Corporation 2-1 Nisshin-cho, Neyagawa-shi, Osaka 572-8540, JAPAN Tel: +81-72-831-8136 Fax: +81-72-833-5222 http://www.onkyo.com/
Onkyo Europe Electronics GmbH Liegnitzerstrasse 6, 82194 Grobenzell, GERMANY Tel: +49-8142-4401-0 Fax: +49-8142-4401-555 http://www.eu.onkyo.com/
Onkyo UK Office Suite 1 Gregories Court, Gregories Road, Beaconsfield, Buckinghamshire HP9 1HQ, UNITED KINGDOM Tel: +44(0)1494-681515 Fax: +44(0)1494-680452 http://www.onkyo.co.uk
Onkyo Europe Electronics GmbH Liegnitzerstrasse 6, 82194 Grobenzell, GERMANY Tel: +49-8142-4401-0 Fax: +49-8142-4401-555 http://www.eu.onkyo.com/
Onkyo UK Office Suite 1 Gregories Court, Gregories Road, Beaconsfield, Buckinghamshire HP9 1HQ, UNITED KINGDOM Tel: +44(0)1494-681515 Fax: +44(0)1494-680452 http://www.onkyo.co.uk
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