Owner’s Manual Stello AI300 INTEGRATED AMPLIFIER April Music, Inc.
INTRODUCTION Thank you for choosing the Stello AI300 from April Music. The AI300 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. 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.
CAUTION y The AI300 is designed to operate at the following voltages; 100, 120, 220, 230V. The chart below provides the necessary information for the line voltage if needed. Note: this work must be accomplished by a qualified technician only. y The AI300 ‘Mains’ power switch is located on the rear panel. The ‘STANDBY’ switch is located on the front panel. During a normal daily operation use only the ‘STANDBY’ switch leaving the Mains switch in the ‘On’ position.
FEATURES Preamplifier Section The modular design of the AI300 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. The following featured circuits and devices are used in the preamplifier section of AI300.
CONNECTION 1. AI300 Integrated Amplifier General Connection The AI300 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.
AUX1, 2 Connection from Video or TV outputs TAPE IN Connection from a cassette tape deck output for playback TAPE OUT Connection from cassette tape deck input for recording 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 AI300 is then working as a fixed input power amplifier.
BYPASS The AI300 used as a Power Amplifier y The AI300 can be activated as a pure power amplifier by pressing the BYPASS button from the remote control handset or directly from the front panel. In this mode an external preamplifier, transistor or tube, will be required. y To return to normal integrated amplifier mode, just press the BYPASS button again.
Surround Processor Connection y To make this connection configuration possible the surround processor should have its own volume control. y The volume control should be done at the surround processor side.
2. Using the AI300 as a Preamplifier Connection to an external power amplifier y Disconnect the loudspeaker cables from the AI300 y Connect the PRE OUT of the AI300 to the MAIN IN of the external power amplifier.
Using a self power Subwoofer system This option will be useful when using a small or medium size loudspeaker system as the main loudspeakers and using the PRE OUT to connect to a self powered subwoofer for an improved bass extension. y Install an interconnect cable between the PRE OUT of the AI300 and the MAIN IN of the subwoofer controller/amplifier. y The following functions, volume, cut-off frequency, phase, etc. should be calibrated directly on the subwoofer controller/amplifier panel.
OPERATION 1. Front panel functions INTEGRATED AMPLIFIER -VOLINPUT BYPASS MUTE DOWN UP STANDBY STANDBY Turning ‘on’ the ‘Mains’ power switch located on the rear panel will activate the amplifier to display APRIL MUSIC STELLO AI300. Moments later the display will change to the default position showing ‘CD 00.0’. y The source selection is accomplished by pressing the INPUT button. y The volume level is controlled by pressing the VOL UP and VOL DOWN buttons.
MUTE y Press the MUTE button once to temporarily turn off the music The display will show ‘MUTE’ and no signal will come out from the amplifier. y To resume play press the MUTE button again or the VOL UP or VOL DOWN button VOL UP / VOL DOWN y The volume control ranges from 0 to 60 in increments of 0.5 for a total of 120 steps.
2. Remote Control Handset Remote control Handset y The remote control handset can control both the Stello CDA200 CD player and AI300 integrated amplifier. y CD Players using the RC-5 code like the Stello CDA200 can be controlled by this remote control unit. PREAMP Battery Replacement Procedure y Using the supplied Allen Key Wrench.
SPECIFICATIONS Input Sensitivity 0.56V, 150W/8 Ohms Signal to Noise 10-20 kHz, -100dB Total Harmonic Distortion 0.005%, at 30W, 8 Ohms Frequency Response 10-35 kHz, +-3dB Power Output 150W/CH at 8 Ohms 250W/CH at 4 Ohms Mains Power Requirement 100/120/230±10% VAC, Selectable Maximum Power Consumption 500 WATTS Signal Outputs RCA/REC OUTPUT, 1 PAIR PREAMP OUTPUT, 1 PAIR Signal Inputs RCA/UNBALANCED, 5 PAIR XLR/BALANCED, 1 PAIR RCA/BYPASS, 1 PAIR Dimension (WHD) 435 x 94.
INTERNATIONAL LIMITED WARRANTY The warranty service is valid only when purchased from an authorized dealer. A valid proof of purchase must be supplied for all warranty services. Any unauthorized work, modification or service rendered on the player will void the warranty. Warranty Period 2 years Date of Purchase Authorized Stello Dealer Telephone Serial No. Authorized Stello Service Center APRIL MUSIC, INC www.aprilmusic.
