"Natural Sound" Concept: Yamaha, with a long history of over 125 years
as a musical instrument maker, also has a high reputation for HiFi components.
Yamaha's A-S501 integrated amplifier takes advantage of this rich experience and
high technological expertise. Based on the concept of "Natural Sound", for
reproducing all music as it really sounds, and built with scrupulous care from
circuit design to basic sound production, the A-S501 reproduces high sound
quality and musically rich sound.
Proprietary Yamaha Technologies: The Yamaha AS-501 integrated
amplifier employs proprietary Yamaha technologies for optimum performance and
- ToP-ART Design: When processing and transmission of the audio
signal is simple and direct there is less chance of it being affected by
noise and distortion. Yamaha's amplifier design technology called "ToP-ART"
features an I/O (input to output) Direct Symmetrical Design, with left and
right channels organized in a straight, symmetrical layout for highest
- ART (Anti-Resonance and Tough): In addition, the ART
(Anti-Resonance and Tough) Base bottom chassis and a solid center bar
provide high-rigidity support and vibration damping.
High Current Amplifier: The Yamaha A-S501 features a dynamic, high
current stereo amplifier with low impedance drive capability. The amp is rated
at 85 watts x 2-channels, measured from 20-20 kHz into 8Ω
with 0.019% THD (100 watts x 2-channels, measured from 20-20 kHz into 6Ω
with 0.038% THD).
High Quality Parts: Custom-made power transformer, custom-made block
capacitors, two direct signal path speaker relays, one-point grounding system,
aluminum-extruded heat sinks and other top-quality parts effortlessly handle
demanding audio signal conditions. The quality of each individual part, as well
as how they work together, basically determines the sound quality of any
component. Yamaha uses only very high quality parts, carefully selected and
Sophisticated Front-Panel Design: With a beautifully simple and unique
design inherited directly from Yamaha's HiFi audio components, this amplifier
also boast an easy-to-operate button layout. The aluminum front-panel has a
richly textured silver hairline finish. The control knobs are also of the same
luxurious construction as used on our top-end models. The rotary encoder makes
it quick and easy to select input sources. The luxury hairline finish material
offers a nice tactile feeling. LEDs clearly show which source is selected, so
you can easily switch sources even in a dark room
Pure Direct Mode: The Pure Direct mode causes the music signals to
travel the shortest possible circuit route, bypassing the buffer amp and the
tone, loudness and balance controls to virtually eliminate any signal
degradation for the purest sound quality.
Variable Loudness Control: The A-S501 also feature a new analog
loudness control on the front-panel that uses electronic volume for higher sound
quality, which lets you adjust the loudness effect as desired. Separate from the
overall volume, this controls the balance of the low- and high- frequency
sounds, providing full tonal range at any volume level; compensating for the
natural loss in the human ear of high and low frequencies at soft levels.
Tone Controls: The integrated amplifier features independent bass (20 Hz) and
treble (20 kHz) controls so you can increase or decrease the low and high
frequency response (+/-10dB). You can also adjust the output balance of the left
and right speakers.
Impedance Switch: The integrated amplifier features a
rear-panel impedance switch to match the impedance level of the speakers
connected. Choose High or Low:
- High: Select High if using one set (A or B) of speakers
with impedance of 6-ohm or higher; when bi-wiring the impedance of the
speaker must also be 6-ohms or higher.
- Low: Select Low if using one set (A or B) of speakers
with the impedance of 4-ohm to 6-ohm; if using two sets (A and B) of
speakers simultaneously, the impedance of each speaker must be at least
8-ohms; when bi-wiring the impedance of the speaker must also be 4-ohms to
Simple Remote Control: The clean, simple design of the remote control
provides easy-to-understand one-hand operation. The easy-to-use design makes it
simple to adjust song volume and order. The remote has a sophisticated looking
hairline finish that matches the design of the amplifiers. You can also use the
remote to control a Yamaha CD/SACD player.
Auto Power Standby: The amplifier has a power management function that
detects when it hasn't been used for a long time (about 8 hours) even though the
power is on, and automatically shifts it into standby mode. So even if you
forget to turn it off, power consumption will be minimized.
Gold-Plated Terminals: The Yamaha A-S501 has gold-plated terminals for
all of its inputs and outputs. These gold-plated terminals ensure a high quality
connection that prevents signal loss.
Analog & Digital Inputs: The Yamaha A-S501 integrated amplifier offers
analog & digital inputs for connection of a variety of home audio components.
- RCA + Phono: The Yamaha integrated amplifier is equipped with six
analog stereo (RCA) inputs for connecting external analog audio sources,
including a turntable. The Phono input can be used to connect a turntable
with an MM phono cartridge to play vinyl records. The unit's Phono input
also features a ground terminal.
- Optical & Coaxial Digital Inputs: The A-S501 is equipped with
both optical (toslink) and coaxial (RCA) digital audio inputs. The optical
and coaxial inputs will accept 2ch PCM (not Dolby Digital/DTS). The audio stays in the digital domain, giving you pure,
pristine dynamic sound for all your entertainment sources, from sports and
other programs to movies and concerts.
Recording Outputs: There are also two pair of RCA outputs for
recording audio through the amplifier to recording device.
A & B Speaker Terminals: The Yamaha integrated amplifier features
binding post terminals for its A & B speaker outputs. You can use the A & B
speaker outputs to power two pair of speakers, or bi-wire a single pair of
compatible speakers. The terminals are not 5-way binding posts because a plastic
collar prevents their use with spade lugs and they are too far apart for dual
Sub Output: A terminal for connecting a subwoofer is provided,
allowing you to increase the bass output of your system for a more powerful
sound with better overall sound quality
Headphone Output: The A-S501 integrated amplifier is
equipped with a front-panel 1/4" headphone output for connecting a pair of
headphones (sold separately). The headphone output and speaker outputs will work
simultaneously; you will need to rotate the speaker selector switch on the
front-panel to the Off position to turn off the sound from your connected