Adastra UM Series Ultra Compact 100V Mixer Amplifier with Bluetooth

Spend £50 For Free UK Delivery
Spend £50 For Free UK Delivery
All orders to mainland UK over £50 are eligible for free standard delivery.
For orders under £50 we have delivery rates starting from just £2.99
Need it fast? No problem, you’ll find express next day delivery rates available on most products. Learn More
60 Day Returns + 1 Year Warranty
60 Day Returns + 1 Year Warranty
We’re so confident that you’ll be happy with your purchase that we’ve extended our returns policy to 60 days.
We call it the “Happy Sound Guarantee”.
If you’re not happy with your purchase for any reason simply send it back to us for a full refund. Learn More
Warranty
K&B Audio are authorised dealers for Adastra. All sales come with a 1 Year manufacturers warranty and full technical support.
Description
Description
100V mixer-amplifiers with USB audio player, FM tuner and BT wireless receiver in an ultra compact housing.
Microphone input, line input and USB/FM/BT sections are governed by front panel volume controls and a master volume.
Mono output to either 100V line or 8 Ohms speaker load is connected via screw terminals on the rear panel.
Supplied with hardware for mounting 2 units side by side in a 1U 19" rack space.
Designed as a versatile solution for small to medium PA installations.
FEATURES
- Ultra compact form factor
- Efficient class D amplifier design
- Internal USB/FM/BT audio player
- 100V line or 8 Ohms operation
- Bluetooth with programmable ID
Key Features
Key Features
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Music SourcesBluetooth, FM Radio, USB Stick
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Inputs3.5mm AUX, RCA
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OutputsRCA Line Out
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Warranty
Specifications
Specifications
- Weight: 2.35 kg
- Dimensions (W x H x D): 249 x 210 x 44 mm
- Alarm Output: N/A
- Output Power (RMS): 30W
- Power Supply: 170-264Vac, 50Hz (IEC) or 24Vdc
- Amplifier Construction: Class D + transformer output
- Audio Source: Internal USB/FM/BT player
- Bluetooth Version: 5.0
- Inputs: 1 x mic (6.3mm), 1 x line (2 x RCA), 1 x aux (3.5mm)
- Line Output: 2 x RCA (mono)
- Speaker Outputs: Screw terminals - 100V / 8Ω / COM
- DC Power: 24Vdc screw terminals
- Mute: 24V relay contacts
- Total Harmonic Distortion (THD): <0.4% @ 1kHz
- Input Impedance: 1kΩ (mic/line)
- Input Sensitivity: -10dB (line), -45dB (mic)
- Signal-to-Noise Ratio (SNR): 80dB (line), 75dB (mic)
- Frequency Response: 100Hz - 18kHz
Note: Amplifier power varies depending on model selected.
What You Get
What You Get
1 x UM series compact 100V amplifier
1 x IEC power lead(s)
1 x Rack-mounting hardware
Downloads
Downloads
Payment & Security
Secure Payments
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Authorised Dealer
K&B Audio are authorised dealers for Adastra. All sales come with a 1 Year manufacturers warranty and full technical support.

Why K&B Audio
Over a Decade of Experience
Established in 2013, we’ve been helping customers enjoy hassle-free home audio for more than 10 years.
Shop with Confidence
Our 'Happy Sound Guarantee' guarantees you expert advice, 60 day returns and free delivery on orders over £50.
35,000+ Satisfied Customers
We’ll always help you find the right solution for your needs, not just what boosts our bottom line. Don’t just take our word for it – read our glowing customer reviews.
Extensive Product Range
With the top brands, carefully curated bundles and thousands of home audio products in stock, we’ve got something for every setup.