Why won't my Adastra A4 connect to Bluetooth?
If your Adastra Amplifier isn't connecting via Bluetooth, there are a few things to check: * Make sure Bluetooth is enabled on the device you are trying to connect. * Ensure the device is within the Bluetooth range (5-10m). * Verify that your device is connecting to “A series”.
What to do if there is no audio from Bluetooth device on Adastra Amplifier?
If you're not getting any sound from your Bluetooth device on the Adastra Amplifier, try the following: * Make sure the volume controls on your sending device are not turned down. * Check the volume and Play/Pause buttons on the media player.
How to fix too loud or distorted output on Adastra A4?
To resolve overly loud or distorted output on your Adastra Amplifier: * Reduce the MIC, LINE IN, USB/SD, and/or MASTER level. * Ensure that Hi-Z line level input(s) are not connected to a Mic input.
What to do if Adastra A4 Amplifier output is too quiet?
If the output from your Adastra Amplifier is too quiet or inaudible: * Increase the MIC, LINE IN, USB/SD, and/or MASTER level. * Check for quiet recording of media files on USB. * Check that VOX override is not unintentionally suppressing audio playback.
Why is my Adastra A4 overheating?
If your Adastra Amplifier is overheating: * Ensure the cooling vents are clear from debris and dust. * Ensure that the load impedance on any output channel is no less than 4Ω.
How to stop microphone feedback on Adastra A4 Amplifier?
To prevent microphone feedback with your Adastra Amplifier, face the microphone away from speakers and monitors, and reduce the microphone level.
What to do if Adastra Amplifier has power but no sound output?
If your Adastra Amplifier has power (lights are on) but no sound is coming out, try these steps: * Check that the speaker output terminals are connected correctly. * Check that the speakers are working by testing them on another amplifier if available. * If using a memory device, remove and re-insert it to ensure it's properly connected. * Make sure you're using standard mp3 digital audio files. * Check the memory device on a PC or Mac to ensure it works for standard playback.
How to troubleshoot no power LED on Adastra A4?
If the power LED on your Adastra Amplifier's control panel isn't lit, check the following: * Ensure the IEC lead is in good condition and connected properly. * Ensure the POWER switch is on and check the mains inlet fuse.
Explains symbols and conventions used in the manual for safety.
Lists important precautions for safe operation, maintenance, and warnings.
Advises on ideal placement to ensure proper airflow and accessibility.
Details how to clean the unit using a soft cloth and neutral detergent.
Details all controls and indicators on the front panel.
Details all input and output connectors on the rear panel.
Explains how to connect speakers and impedance considerations.
Details microphone, aux, and line input connectivity.
Provides instructions for powering on, testing, and using controls.
Describes controls for USB, SD, FM tuner, and Bluetooth playback.
Instructions for playing audio files from USB or SD media.
Guide to tuning and selecting FM radio stations.
Steps to pair and connect Bluetooth devices for audio playback.
Information on using the infrared remote control for the media player.
Lists key technical details of the amplifier.
Provides solutions for common operational issues.
The Adastra A4 is a rackmount quad amplifier with an integrated media player, designed for public address systems in both mobile and installed environments. This device offers high-quality, dependable service, providing amplification for up to four speaker output channels and supporting multiple audio sources.
The primary function of the A4 is to amplify audio signals for public address. It features four independent speaker output channels (Ch1, Ch2, Ch3, Ch4), which can be configured as two independent stereo zones (Left 1 + Right 1 and Left 2 + Right 2). Each output channel is designed to connect to speakers with a combined impedance of no less than 4Ω. The amplifier delivers its maximum power output at this minimum impedance rating, with higher impedances resulting in lower outputs. The combined load on each output shares the power from the amplifier, meaning if the amplifier is delivering 200W to two speakers connected in parallel with the same impedance, each speaker must be capable of handling 100W.
The integrated media player is a versatile component, supporting playback of audio files from USB or SD media, FM radio stations, and Bluetooth connections. This allows for a wide range of audio content to be played directly through the amplifier.
Input flexibility is a key feature, with two microphone inputs (6.3mm jack) on the front panel, allowing for voice announcements. These microphone inputs are always fed to all outputs, ensuring that announcements can be heard regardless of the selected stereo input. The amplifier also provides four selectable stereo sources: a 3.5mm stereo Aux input on the front panel, two stereo line inputs (Line 1 and Line 2) on the rear panel (with Line 1 offering both 6.3mm jack and RCA options, and Line 2 offering RCA inputs), and the internal media player. Each stereo input can be independently selected for either the Ch1+Ch2 or Ch3+Ch4 output pairs.
The A4 includes a "Talkover" feature, which, when activated, temporarily reduces the volume of any audio playback from the selected stereo Aux, Line, or Media input when a microphone is in use. This ensures that voice announcements are clearly heard without interference.
For tone shaping, the amplifier provides Bass and Treble EQ controls for each pair of outputs (Ch1+Ch2 and Ch3+Ch4). These controls allow users to adjust the low and high frequencies of the audio signal, respectively, to suit the audio content or compensate for room acoustics.
General| Amplifier class | D |
|---|---|
| Frequency range | 20 - 20000 Hz |
| RMS rated power | 800 W |
| Output impedance | 4 - 8 Ω |
| Input sensitivity | 775 mV |
| Audio output channels | 2.0 channels |
| Peak power per channel | 200 W |
| Signal-to-Noise Ratio (SNR) | - dB |
| Total Harmonic Distortion (THD) | 0.1 % |
| Microphone in | Yes |
| Audio (L/R) in | 2 |
| Audio (L/R) out | 4 |
| Headphone connectivity | 3.5 mm |
| USB 2.0 ports quantity | 1 |
| Speakers connectivity type | Binding post |
| Purpose | - |
| Product color | Black |
| Rack capacity | 2U |
| Volume control | Rotary |
| Channels quantity | 4 channels |
| Connectivity technology | Wired & Wireless |
| AC input voltage | 230 V |
| AC input frequency | 50 Hz |
| Power protection features | Over current, Over voltage, Overheating, Short circuit |
| Package depth | 325 mm |
| Package width | 505 mm |
| Package height | 140 mm |
| Package weight | 6820 g |
Weight and Dimensions| Depth | 240 mm |
|---|---|
| Width | 482 mm |
| Height | 88 mm |
| Weight | 5980 g |
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