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Monacor STA-450D & STA-850D Digital PA Amplifiers with 4 or 8 Channels

by Monacor
£215.00 (inc. VAT)
Channels (Model)

The Monacor STA-450D & STA-850D Digital PA Power Amplifiers are perfect for multi-zone PA applications for both music playback and voice. Available with 4 or 8 channels.

These digital power amplifiers are equipped with 4 or 8 channels all rated at 50W RMS. For a higher output power, two channels each can be bridged providing a combined 100W RMS output. Each channel has its own level control.

Thanks to Class-D Amplification the STA-450D & STA-850D are extremely energy efficient and operate at really low temperatures. They also have a silent operation due to a fanless cooling concept. 

Inputs include 4 or 8 x XLR sockets designed for balanced signals from mixing desks, Preamplifiers and CD players (550 mV min.) and 4 or 8 x RCA jacks for connecting a standard signal source from smartphones, tablets, and laptops (1 V min.).

Installation is quick and easy and will have you up and running in no time. Loudspeakers can be connected to the STA-450D and STA-850D via the push terminals at the rear of the amplifier. 

The Monacor STA-450D and STA-850D PA Amplifiers are designed for installation into a 19" rack cabinet (482mm), but can also be used as a tabletop unit. The STA-450D and STA-850D take up 2U rack space. 

All Monacor products are supplied with a manufacturer's 3-Year warranty.

Monacor STA-450D & STA-850D Digital PA Amps Key Features

  • Class-D Amplification - Highly efficient

  • 4 or 8 Channels rated at 50W RMS each

  • Two channels can be bridged for 100W RMS

  • Level control for each channel

  • 4 or 8 x Balanced XLR inputs

  • 4 or 8 x RCA line inputs

  • 19" Rack-mountable

  • 3-Year manufacturers warranty


 All Monacor products have a 3 year warranty

If you require any assistance with any of our products then call us on 02476 369890 and one of our specialists will be happy to help. Or you can use our Request a call back form. 

See SPECIFICATION tab for technical specs


Monacor STA-450D Power Amplifier Specifications

  • Channels: 4
  • Power rating: 200 W
  • Power rating at 4 ohm: 4 x 50 W
  • Power rating at 8 ohm: 4 x 30 W
  • Power rating with 8 ohms bridged operation: 2 x 100 W
  • Peak music power output (PMAX): 300 W
  • Inputs: 1 V/20 k ohm unbal. 550 mV/20 k ohm bal.
  • Frequency range: 10-20,000 Hz
  • Crosstalk attenuation: > 45 dB
  • Power supply: ~ 230 V/50 Hz/300 VA
  • Mains voltage: ~ 230 V
  • Mains frequency: 50 Hz
  • Power consumption, operation: 300 VA
  • Admiss. ambient temp.: 0-40 °C
  • Dimensions: 483 x 90 x 330 mm, 2 RS
  • Width: 483 mm
  • Height: 90 mm
  • Depth: 330 mm
  • Rack spaces, RS: 2
  • Weight: 8.4 kg
  • Connections: 4 x XLR, bal., 4 x RCA, 4 x spring-load. speaker term. L/R

Monacor STA-850D Power Amplifier Specifications

  • Channels: 8
  • Power rating: 400 W
  • Power rating at 4 ohm: 8 x 50 W
  • Power rating at 8 ohm: 8 x 30 W
  • Power rating with 8 ohms bridged operation: 4 x 100 W
  • Peak music power output (PMAX): 600 W
  • Inputs: 1 V/20 k ohm unbal. 550 mV/20 k ohm bal.
  • Frequency range: 10-20,000 Hz
  • Crosstalk attenuation: > 45 dB
  • Power supply: ~ 230 V/50 Hz/600 VA
  • Mains voltage: ~ 230 V
  • Mains frequency: 50 Hz
  • Power consumption, operation: 600 VA
  • Admiss. ambient temp.: 0-40 °C
  • Dimensions: 483 x 90 x 330 mm, 2 RS
  • Width: 483 mm
  • Height: 90 mm
  • Depth: 330 mm
  • Rack spaces, RS: 2
  • Weight: 10.5 kg
  • Connections: 8 x XLR, bal., 8 x RCA, 8 x spring-load. speaker term. L/R

    Monacor STA-450D Power Amplifier - PDF Downloads

    Download the Product Spec Sheet Here

    Download the Instruction Manual Here

    Monacor STA-850D Power Amplifier - PDF Downloads

    Download the product Spec Sheet Here

    Download the Instruction Manual Here


      Monacor Background Music System Products

      Monacor - a premium brand, engineered in Germany that's a heavyweight in the background music industry.

      Founded in 1965 by Günter Schilling, Monacor has grown to be a global player in technology with trading partners in over 40 countries.

      As well as providing a superior sound quality and an industry leading 3-year warranty on their products, Monacor also have an in-house UK based repair workshop, giving you peace of mind.

      The Monacor technical advisers have extensive background audio experience and are always on hand to advise Audio Volt on the latest industry advances.

      Audio Volt is proud to stock Monacor and offers FREE UK Shipping on orders over £50 with in-stock items dispatched within 24 hours.

      Our sales manager Tom says; "Monacor is a high-quality, premium brand that is well-engineered. Perfect for a professional look and a world-class sound!"

      Monacor was our brand of choice when we designed our mighty 24 speaker background audio system, suitable for large spaces, warehouses, offices and large department stores.

      With an impressive range of speakers and some of the most powerful amplifiers available in the background audio market, you can be sure to find a Monacor system you will be delighted with. 



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      Delivery Charges

      Orders over £50.00 will be delivered FREE of charge via our Standard UK Delivery Service (2-3 days, UK Mainland).

      All orders below £50.00 will be sent at a rate of £3.99 per order (2-3 days, UK Mainland). 
      If you need your item faster we also offer a Premium Delivery, Next Day Tracked service at a cost of £9.95.

      Do you require your item before 12 pm? We offer a Premium Delivery, Next Day Tracked, Pre 12 service at a cost of £24.95.

      All delivery options will be available at the delivery stage in the checkout. 

      (Please ensure you add a mobile number to your order for tracking)

      European Delivery Charges

      Standard EU Shipping service £16.99  (Shipping to France, Germany, Ireland, Guernsey & Jersey - 2-4 days)


      Delivery Notes

      On delivery you must inspect the goods carefully for damage as Audio Volt is unable to accept responsibility for damage in transit, shortage of delivery or loss of products unless the customer advises Audio Volt of such within three working days from the date of delivery.

      60 Day Returns Policy

      We ask that you follow these guidelines to help us process your return as quickly and efficiently as possible:

      1. Please keep your order reference to hand. This confirms your original order and gives us the necessary details to authorise the product’s return.

      2. Contact our Customer Services Team on 02476 369890 (or e-mail We will then send you an RMA number and returns form which needs to be completed and sent back with the returned item(s).

      3. (If the order has been unpacked) re-package it to ensure that it is being returned in its original condition. Please make sure all items relating to the product are returned, including manuals and cables.

      4. When returning an item please obtain a ‘proof of postage’ receipt from the Courier.

      Returned items must be mailed within 10 days of when the RMA Number has been issued. Items received with a post date 30 days after your requested return will NOT be eligible for refund.

      Please note: Our returns policy is quite straightforward but there are a number of conditions that we ask our customers to comply with before applying:

      1. It is your responsibility to request a return. If you don’t tell us you want to make a return, we don’t know. Once you do tell us, we will do everything we can to action it.

      2. If you have not requested a return within 60 days of receiving an order, we will have assumed that you are intending to keep it and we will not authorise a return.

      3. We always refund the payment according to how the original purchase was made and aim to do so within 72hrs of the return being received by us.

      4. Returned goods are liable for a restocking fee of 15% towards handling and repackaging if the order is not returned in its original, unopened packaging. This charge will be subject to our inspection of the returned goods.

      5. Delivery charges will not be refunded unless the delivered goods are faulty.

      6. Replacement products are dispatched immediately after the returned goods have been received and accepted by Audio Volt.

      7. Items that develop a fault within 30 days of delivery are eligible for a replacement or a refund. Delivery costs are also reimbursed for faulty items. Please contact our Customer Services Team on 02476 369890 if you believe your item has developed a fault.

      Finally, please remember that notifying us of your intention to apply for a return, saving the delivery paperwork and keeping the order in its original packaging will help both you and Audio Volt to process the return quickly.

      If you have any questions about our Returns policy please telephone us on 02476 369890 or email us at