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Onkyo A9555
Onkyo A-9555 Integrated Digital Stereo Amplifier (Black)
Digital amplification enables significant power efficiency savings and supports smaller, more compact designs—obvious benefits for today’s home lifestyles. However, at Onkyo, we believe that these benefits should not come at the expense of the most important consideration: sound quality. With the A-9555 integrated digital amplifier, sound quality takes precedence over all else. By using Onkyo’s exclusive Vector Linear (VL) Digital technology to remove any spike noise before it introduces errors into the inversion timing, it is possible to get a highly accurate analog-to-digital conversion. Also, at the heart of the A-9555 is a Pure Stream Power Supply—essentially a large power transformer—that ensures that you always have the on-demand power for the clarity and detail of a range of musical genres. By integrating the fundamentals of audio amplification with the potential of digital amplification, the A-9555 is a revelation in superior audio reproduction.
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Key technology Features:
RI (Remote Interactive): With Onkyo’s
exclusive RI (Remote Interactive) system
capability, you can integrate and operate all
compatible components through a single remote
control. What’s more, RI capability enables you to
simply connect the iPod® to your receiver through
Onkyo’s RI Dock for the iPod (DS-A1). Your iPod
effectively becomes another Onkyo component from
which you can relish a fuller sound that just
can’t be experienced through headphones. RI
capability will also give you remote operability
of your iPod for hands-off control over your
digital music.
VLSC (Vector Linear Shaping Circuitry): Conventional D/A conversion methods reduce digital pulse noise at the conversion stage but can’t remove it completely. Previously only found on our high-end components, VLSC (Vector Linear Shaping Circuitry) employs a unique D/A conversion circuit to overcome this problem. Data is converted between sampling points and these points are joined with analog vectors in real-time to produce a smooth output wave form. The result — a virtually noiseless, smooth analog signal based on the digital source to bring out even the most subtle of nuances in your music, movie soundtracks and even MP3s.
Product Features
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Power Output |
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8 ohms |
2 x 85 W/Ch |
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Dynamic Power |
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4 ohms |
2 x 200 W |
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HICC |
80 A |
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Audio in/out |
7/2 |
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Phono input |
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Exclusive Vector Linear (VL) Digital technology |
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Optimum Gain Volume Circuitry |
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All discrete output stage circuitry |
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Low-impedance, thick bus plate |
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Audiophile-grade capacitor |
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Precision motor-driven volume control |
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Tone control (Bass, Treble, Loudness On/Off) |
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Pure direct mode |
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Discrete phono equalizer circuitry |
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High-rigidity, anti-resonant chassis |
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Speaker A/B posts |
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Compatible with Remote Interactive Dock for the iPod |
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RI (Remote Interactive) remote control |
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Banana Plug Speaker Terminals |
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Product Specifications
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Amplifier Section |
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Power Output |
85 W/Ch (8 ohms, 0.5 %, FTC) |
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Dynamic Power |
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3 ohms, Front |
230 W/Ch |
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4 ohms, Front |
200 W/Ch |
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8 ohms, Front |
120 W/Ch |
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Total Harmonic Distortion |
0.08 % |
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Damping Factor |
25 (Front, 1 kHz, 8 ohms) |
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Input Sensitivity and Impedance |
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Phono MM |
2.5 mV/50 k-ohms |
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CD |
200 mV/50 k-ohms |
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Output Level and Impedance |
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Rec out |
200 mV/2.2 k-ohms |
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Phono Overload |
70 mV (MM, 1 kHz, 0.5 %) |
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Frequency Response |
10 Hz-60 kHz (+ 1, - 3 dB, CD) |
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Tone Control |
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Bass |
+ 10 dB, - 10 dB, 100 Hz |
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Treble |
+ 10 dB, - 10 dB, 20 kHz |
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Loudness |
+ 10 dB, 50 Hz / + 2 dB, 10 kHz |
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Signal-to-Noise Ratio |
100 dB (CD, IHF-A), 70 dB (Phono, IHF-A) |
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Speaker Impedance |
4 ohms-16 ohms |
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General |
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Power Supply |
AC 120 V, 60 Hz |
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Power Consumption |
110 W |
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Standby Power Consumption |
0.3 W |
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Dimensions (W x H x D) |
17-1/8" x 5-13/16" x 16-15/16"/435 x 148 x 431 mm |
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Weight |
28.7 lbs./13 kg |
Top 100 Customer-rated Home Audio Products
Most Helpful Customer Reviews
"stealth
amp", I ordered this amp on a whim as a companion
for an Onkyo DX-7555 (single disc "audiophile" CD player) since they share a
sophistocated remote system. I owned, and still own, a somewhat esoteric
AudioLab 8000S which I consider to be sonically flawless and offering great
flexibility even though it's almost 15 years old and really didn't expect the
Onkyo to be much other than a typical import amp with a lot of bells and
whistles but not outstanding performance.....big surprise. This amp is easily
the sonic equal of my "British hand crafted" AudioLab, is robustly built and
very, very musical. A great bargain at less than $500.
Particularly rewarding is a better than decent MM phono section allowing me to
retire a separate head amp for those rare occasions when only vinyl will do.
Additionally, while the unit includes bass/treble/and a subtle "loudness
contour", the additional circuitry can be bypassed for a "direct" mode which
essentially provides a straight wire of gain to your speakers...very clean and
powerful. With the companion CD player it's a knockout combination and I
recommend it highly.
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Nice
amp, but not a giant killer, I've been listening to this amp for a couple
of weeks now and it is a very good amp. I wish I could give it 3.5 stars as I
like it, but it isn't great. Don't get me wrong, it is much better than 90% of
AV receivers out there, but if you're looking for true audiophile sound, this
amp won't quite get you there, as some professional reviews may easily lead
one to believe.
Good points:
-Smooth, somewhat lush "tube-like" sound that is forgiving and never bright or
harsh.
-Very good midrange quality with some nice warmth that is very natural.
-Full bass.
-Nice overall build quality (except for the binding posts and other
connectors).
-Simple, easy to use remote.
-Front panel controls have a high quality feel and the layout is very nice.
-The look is understated and elegant.
-Good to have a removable power cord for upgrades.
Bad points:
-The "tube-like" sound can be a litle too rolled off in the high notes. I
don't hear all the detail and decay in the highs that I've heard from higher
end gear.
-The bass, while full and tuneful, lacks definition and leading snap.
-Dynamics are okay. I don't get the attack and immediacy I've heard from other
(high priced / audiophile) amps. The jump factor is toned down a little.
-The binding posts and RCA connectors work fine, but when connecting cables,
they move quite a bit. I'm sure they're fine, but they don't exactly instill a
feeling confidence that they'll hold together over the long haul.
-A product of this caliber should have pre-out / main-in jacks or atleast a
pre-out for a subwoofer.
Overall I like this amp. I've just been spoiled by higher-end gear. I would
say that the sound is very competitive with upper mid-fi integrated amps from
NAD, Rotel, and Cambridge Audio to name a few. All these product brands have
their strengths and weaknesses in general. It really comes down to preference,
the type of music you mostly listen to, your listening space, and synergy
between your other components. In the end, this amp is really quite nice and
should easily fit into most people's criteria for good sound quality at a
reasonable price.
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Awesome sound,
great value, I bought this amplifier after a very favorable review in the Nov, 06 issue of The Absolute Sound, and I'm really glad that I did. The dynamics of the sound remind me of Sonic Impact (another class D amplifier) but without the distortion, particularly in the upper frequencies. This amplifier sounds relatively warm, quite listenable and produces music effortlessly and cleanly. The silver chassis looks amazing; too bad the golden color is not available in the US, or the more powerful 9755 model. I highly recommend this amplifier.
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