Pulse SDA40 Compact Desktop Class-D Stereo Amplifier - 2 x 20W

The Pulse SDA40 is a compact Class-D desktop audio amplifier designed specifically for audio installations in a variety of environments where high reliability and premium sound quality are a must. 

The Pulse SDA40 is found in applications such as:

• Kiosk and retail displays
• Offices
• Hotel lobbies and waiting rooms
• Dental practices, surgeries and vets
• School classrooms
• Gaming and vending machines
• Small cafes and takeaways
• Powering additional zones on an existing audio system

Class-D Amplification

Featuring class-d amplification the SDA40 is highly efficient (85%) and uses very little energy - saving you money on your energy bills! The Pulse SDA40 not only saves you money in running costs but is also one of the cheapest class-d stereo amplifiers below £100.00

Boasting world-class components and a highly rugged construction the Pulse SDA40 is perfect for continuous duty applications in situations where power will be left on for indefinite periods of time.

Ultra-compact Design

Due to its extremely compact size, the SDA40 can be mounted on/under a desk, on a wall, or even above a ceiling tile perfect for environments where space is at a premium.

• Dimensions: 56mm (H) x 230mm (W) x 115mm (D)
• Weight: 1kg

Flexible inputs/outputs

The SDA40 stereo amplifier has 2 x 20W channels that each have a dedicated RCA mic/line input. This is perfect for installs that have a couple of rooms/areas and are wanting to play different things in each. For example, a small cafe may want to play the radio in the main eating area, and then a smartphone in the kitchen. Alternatively, you can bridge one input to play through both channels if you are just wanting to play the same audio throughout. 

Power Output

• Both channels 20W x 2 Channels driven at 4ohms
• Mono bridge mode 40W x 1 Channel driven at 8ohms

Power Output

• Both channels 20W x 2 Channels driven at 4ohms
• Mono bridge mode 40W x 1 Channel driven at 8ohms

Frequency Response: 50Hz ~ 18KHz

Total Harmonic Distortion (THD): 0.05%

Power requirements: 24VDC, AC adaptor supplied

Dimensions: 56mm (H) x 230mm (W) x 115mm (D)

Weight: 1kg. 

Digital Downloads (buying software)

All software marked as "serial download" or "digital download" will be delivered via email within normal office hours.

Simply add the software to the basket and at the delivery stage in the checkout please select "Digital Download - Software by email" as your delivery method

Delivery Charges (Main Products)

All orders over £39.00 will be delivered free via our standard delivery 2-3 days (UK Mainland)

If you need your item faster we also offer a Priority Tracked service at £3.99 (1-2 days) or Next Day Tracked £6.99

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

Saturday delivery is available when ordered before 2pm (Mon-Fri)

All orders below £39.00 will start as low as £2.99 depending upon weight and qty(s) (UK Mainland) 

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

EU Delivery Times

Non UK Mainland Addresses please allow 1-3 Days
Delivery To Belgium / France / Germany please allow 3-4 Days
Music PC Systems - Please allow 5-7 Working Days build time (UK) 7-14 (Rest of the World)

French - Pour la Livraison s'il vous plaît permet en France 2-4 Jours
German - Für Lieferung Nach Deutschland erlaubt bitte 2-4 Tage

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

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 369898 (or e-mail cs@inta-audio.com). 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 28 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 Inta Audio.

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 369898 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 Inta Audio to process the return quickly.

If you have any questions about our Returns policy please telephone us on 02476 369898 or email us at cs@inta-audio.com.