Adastra AS-4 Audio Source with DAB+, FM, USB, AUX and Bluetooth

Save £22.90
AdastraSKU: 952.984UK

Sale price£206.10 Regular price£229
In Stock


AS-4 is a 1U rack-mountable sound source with DAB+ tuner for digital radio reception and FM analogue radio tuner built in.

In addition, the AS-4 has a USB audio player for mp3 tracks and a front mounted Aux input for wired connection to an mp3 or CD player.

For connection to a smart phone or tablet, the AS-4 also has Bluetooth for wireless playback of audio tracks.

Each audio source can be setup and controlled from the front panel or via the supplied I.R. remote control and there are even 2 programmable alarms which can trigger DAB/FM playback or a beep sound at preset times.

In summary, this is a playback solution to ensure there is more than enough choices of background music to suit any location.


  • DAB+ digital radio tuner
  • FM analogue radio tuner
  • USB audio player
  • Bluetooth receiver
  • 2 programmable alarms
  • Supplied with I.R.remote control
  • Power supply: 100-240Vac, 50/60Hz (fig.8)
  • DAB frequency range: 174 - 240MHz
  • FM frequency range: 87.5 - 108MHz
  • USB port: USB 1.0/1.1/2.0 up to 32GB, FAT16/32
  • Antenna connection: RF coax (FM/DAB+ aerial supplied)
  • Display: Backlit LCD for track info, frequency, DAB+ DLS, B/T pairing
  • Auxiliary input: 3.5mm stereo jack
  • Headphone output: 3.5mm stereo jack
  • Line output: L+R RCA
  • S/N ratio: 60dB
  • Remote : battery2 x AAA (supplied)
  • Frequency response: 20Hz - 20kHz
  • Dimensions: 482 x 285 x 44mm (1U)
  • Weight: 2.27kg
  • AS-4 audio source 1U rack
  • I.R. remote control
  • DAB aerial
  • RCA lead
  • 2-pin mains lead
  • 2 x AAA batteries
DPD Local Courier


We know you can't wait to start enjoying your new speaker system, so we only use the quickest and most reliable couriers. We keep plenty of stock so 95% of orders are delivered the next day!


Mainland UK

FREE Delivery On Orders Over £89 (2-3 Working Days) £0.00
Standard Delivery (2-3 Working Days) £4.99
Express Delivery (1-2 Working Days)* £6.99



 Standard Delivery (3-4 Working Days) £14.99


* Available on selected products.



We only use the best, and that's decided by our customers.

The majority of our orders go via Interlink, UK Mail, DPD. Some lower value items such as spare parts and remote controls go Royal Mail.

Free delivery is normally via next day courier as well. (We don't guarantee you'll receive free delivery items the next day, but 99% of the time you will!) 

K&B Audio Delivery Details - We Use DPD, UK Mail & ParcelForce



Once you place an order with us you will receive a notification e-mail outlining your order and details. We then get busy picking and carefully packing your item. Once we've got it all ready to go you'll receive another update to tell you it's been dispatched with a tracking number so you can keep an eye on it!

99% of our customers receive their items sooner than they expected. We pride ourselves on super-fast deliveries and do everything we can to deliver on that promise.

Any stock issues, or other delivery issues will always result in a quick phone call and e-mail to keep you updated. However we have carefully picked our products so we rarely have stock issues.





Working days are Monday to Friday. All orders on Friday will be shipped via next working day courier which means your item will arrive on the Monday.

Orders placed on weekends will be processed and dispatched on the Monday unless otherwise stated. Orders placed on bank holidays will be processed and dispatched on the next working day.

Some additional costs apply to Ireland, Europe & Scottish Highlands.



Most orders received before 2pm are processed and dispatched the same day provided the items are in stock with exception of items that have a custom stock status displaying a lead time.

After 2pm we will try our best to dispatch the same day provided our couriers have not been, however we cannot guarantee same day dispatch after 2pm.

If a product is delayed or out of stock we will contact you by telephone and/or e-mail in the earliest instance to discuss your order. We do our best to ensure that our stock levels are accurate, but on the odd occasion if the item you have purchased is out of stock we will contact you ASAP to discuss alternatives or to advise of the lead time.



Please be aware that the above are guidelines, we try our best to stick to these guidelines but some delays can be caused by couriers which we have no control over.

If you are using an electrician to install your system then please order in good time we cannot be held responsible for any costs or issues incurred in delaying your electricians due to any dispatch or delivery issues. We recommend that you give yourself a good few days in advance at a minimum.



If you have not received your item after 4-5 working days (UK) please contact us immediately so that we can look into it for you.

This is very rare, we use the best couriers and can keep track of your item at every stage.

Please read our terms & conditions for full details and please feel free to contact us if you have any other questions or queries.

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