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INTRODUCTION
AI 320
INTEGRATED AMPLIFIER
Thank you for choosing the Stello AI:320 from April Music.
The AI:320 is one of the finest integrated amplifiers available on the market today. It will give
the true meaning to the reproduction of recorded music with high fidelity and musicality.
Although the natural reproduction of recorded music is not only an elegant way to describe
our product, it is a feeling that captures your full attention from the very first moment you
experience the Stello integrated amplifier. You can feel the subtlety and nuances of the inner
details, the lightness of touch within the music which you can only feel at the concert hall.
The AI:320 delivers 140Watts per channel and will power with an extreme ease most of the
loudspeaker systems designed for home audio applications, even those that are very
demanding. Your amazement will also be triggered by an extremely quick transient
response where every small micro dynamic signal is distinctively there!
We designed the AI:320 with some very interesting features
The PREAMPLIFIER OUTPUT, for example, allows the use of an
independent external amplifier to be coupled with the preamplifier section
of the AI:320.
The BYPASS input is also prepared to support AI:320 as a main power
amplifier when used with a surround processor.
The CS3310-based volume control is a very high-end volume control
logic which is not usual with products in such an affordable price range. A
120 steps volume control allows the user to set the volume with an
extreme accuracy.
The Remote Control Unit has been designed to operate both Stello
products, the AI:320 and CDA320. It is machined in a solid block of
aluminum.
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Summary of Contents for April Music Stello AI 320

  • Page 1 INTRODUCTION INTEGRATED AMPLIFIER Thank you for choosing the Stello AI:320 from April Music. The AI:320 is one of the finest integrated amplifiers available on the market today. It will give the true meaning to the reproduction of recorded music with high fidelity and musicality.
  • Page 2 AI 320 CAUTION INTEGRATED AMPLIFIER The AI:320 is designed to operate at the following voltages; 100, 117, 220, 230(240)V. The chart below provides the necessary information for the line voltage if needed. Note: this work must be accomplished by a qualified technician only. The AI:320 'Mains' power switch is located on the rear panel.
  • Page 3 AI 320 FEATURES INTEGRATED AMPLIFIER Preamplifier Section The modular design of the AI:320 makes upgrade and service maintenance a mere formality. This single feature alone is your long term insurance against built in obsolescence. The volume control stage is done domain to preserve the quality and integrity of the sound signal using Cirrus Logic CS3310 integrated circuit.
  • Page 4 AI 320 CONNECTION INTEGRATED AMPLIFIER 1. AI 320 Integrated Amplifier General Connection MONITOR AUDIO OUT AUDIO IN HI-FI 93.1 CD PLAYER TUNER The AI:320 is equipped with five 'Unbalanced' inputs (RCA) and one 'Balanced' input (XLR). For optimal results we recommend to use of the 'Balanced' connection whenever the source component is equipped with a 'Balanced' output.
  • Page 5 AI 320 CONNECTION INTEGRATED AMPLIFIER BYPASS This input is used for a multi-channel surround processor. Connection from the main left and right outputs of the surround processor to this input. This function is activated when pressing the BYPASS button on the remote control handset or directly on the front panel. The AI:320 is then working as a fixed input power amplifier.
  • Page 6 AI 320 CONNECTION INTEGRATED AMPLIFIER Surround Processor Connection To make this connection configuration possible the surround processor should have its own volume control. The volume control should be done at the surround processor side. 3 CHANNEL AMP SUBWOOFER (POWERED) MAIN SURROUND PROCESSOR Cassette tape recorder connection MONITOR...
  • Page 7: Integrated Amplifier

    AI 320 AI 320 CONNECTION CONNECTION INTEGRATED AMPLIFIER INTEGRATED AMPLIFIER 2. Using the AI 320 as a Preamplifier 2. Using the AI 320 as a Preamplifier Connection to an external power amplifier Connection to an external power amplifier Disconnect the loudspeaker cables from the AI:320 or press 'SPK OFF' button Disconnect the loudspeaker cables from the AI:320 or press 'SPK OFF' button on the remote control handset.
  • Page 8: Operation

    STANDBY Turning 'on' the 'Mains' power switch located on the rear panel will activate the amplifier to display APRIL MUSIC STELLO AI:320. Moments later the display will change to the default position showing 'CD 00.0'. The source selection is accomplished by pressing the INPUT button.
  • Page 9 AI 320 OPERATION INTEGRATED AMPLIFIER 2. Remote Control Handset Remote control Handset The remote control handset can control both the Stello CDA320 CD player and AI:320 integrated amplifier. CD Players using the RC-5 code like the Stello CDA320 can be controlled by this remote control unit. Battery Replacement Procedure Using the supplied Allen Key Wrench, remove the back cover on the remote control handset.
  • Page 10: Specifications

    AI 320 SPECIFICATIONS INTEGRATED AMPLIFIER INPUT SENSITIVITY: 0.56 V, 140W / 8 Ohms SIGNAL TO NOISE: 10-20 kHz , -100dB THD: 0.005%, at 30W, 8 Ohms FERQUENCY RESPONSE: 10- 35kHz, +-3dB POWER OUTPUT: 140W/CH a t 8 Ohms MAXIMUM POWER CONSUMPT ION: 500 WATTS SIGNAL OUTPUTS: 1 RCA/R EC Output 1 PREAMP Output...