Speech transfer systems

This is a Special Order Item

Speech System Amplifier

Product Code: CO-STS-A31

RRP $509.00
Unit of Measure


2 Year
Technical Specifications
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Speech Transfer Amplifier

Our amplifier provides full open duplex communication and is compatible with all of our speech transfer products



  • Energy-saving “green” standby mode is automatically used, achieving a power saving of up to 80%
  • Advanced digital signal processing for speakers and induction loop
  • Constant-current loop drive (with engineer adjustable loop drive level)
  • Isolated audio line input / output allows additional ohmically isolated line level audio input or output to recording system (factory options, not available together)
  • LED column indicator aids adjustments and indicates power and status
  • Continuous self-testing means that no specialized equipment is required to confirm functionality
  • DC Power: 2.1mm DC jack
  • Power and status indication: Green/red LED column

Technical Data:


Physical Data:

Supply Voltage 12-14 VDC Dimensions

Height 116mm (4.57”)
Width 115mm (4.53”)
Depth 40mm (1.57”)

Quiescent Current 100mA typical Weight 100g (0.22lbs)
Operating Current 2A typical on speech peaks Construction

ABS Plastic
Construction Housing

Power Switch

Push on - push off (tact switch under membrane)

Finish Matt Black Fine Texture

Electret, supply 5V via 2.2KΩ load resistor

Speaker Output Power RMS: 2.5W / 8Ω, 4.4W / 4Ω    
Loop Drive Compliance

Constant current, bounded by 4V RMS & 2A RMS

Total Harmonic Distortion <5% (loop and speakers)    

Product Documents

No documents available

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Orders placed though the Amber Technology website are despatched from our Sydney warehouse. Orders placed before 1.00pm Sydney time (for items in stock) will generally be shipped on the same day. 

We ship using Australia Post and Startrack Express. We deliver Australia-wide to residential, business and PO box addresses.

Shipping is free for all orders over $275 including GST (effective 1 March 2018). There is a $22 (including GST) shipping and handling charge for all orders under $275 including GST. 


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We will email the tracking number for your shipment shortly after it’s been despatched. If you have any questions regarding shipping, please contact us.


Our goods come with guarantees that cannot be excluded under the Australian Consumer Law. You are entitled to a replacement or refund for a major failure and compensation for any other reasonably foreseeable loss or damage. You are also entitled to have the goods repaired or replaced if the goods fail to be of acceptable quality and the failure does not amount to a major failure.

All items purchased from Amber Technology will be covered under warranty. The duration and terms of this warranty are specified by the manufacturer unless otherwise stated. Warranty information is available on the individual product listings on this site.

Refurbished items will include a 12 month warranty unless otherwise stated.

Please contact us if you have received an item which has been damaged in transit or is otherwise not working correctly when you receive it. Subject to availability, we will arrange for a replacement item to be despatched and for the faulty item to be returned to us. 

Amber Technology maintains a nation-wide network of carefully selected Authorised Service Agents to ensure that you are never far from convenient, expert technical and service support. If your item develops a problem and requires servicing under warranty, please contact your local Authorised Service Agent.

Stock Availability

The availability of stock is communicated via the indicator of each product listing page. "Available" means that reasonable stock is in our warehouse, ready for immediate shipment. "Limited Stock" means that we have only a small number of items in stock. "Out of Stock" means this item is currently unavailable for immediate shipment - orders placed for ‘Out of Stock’ items will be fulfilled as soon as replacement stock arrives.

"Special Order” items are products that are not generally kept in stock in Australia. Lead times for Special Order items vary depending on country of origin, manufacturer’s stock levels, factory production schedules and/or incoming shipment transit times. Please contact us for an estimate as to the likely lead time.

Refurbished items

If refurbished stock is available, this will be shown on the summary page for the product. If a product listing only allows you to choose refurbished stock, we are not holding new stock and we can no longer obtain new stock.

Refurbished items are always in perfect working order and will include all accessories. Refurbished items are may

  • have a damaged carton
  • have been used for demonstrations
  • have been repaired
  • have minor imperfections that do not impact performance.

Refurbished items include a 12-Month warranty unless otherwise stated.

Technical Support

Please visit the Get Support page to find a service agent, log a service ticket, or ask a technical question about your product.


Please contact us if you have received an item which has been damaged in transit or is otherwise not working correctly when you receive it. Subject to availability, we will arrange for a replacement item to be despatched and for the faulty item to be returned to us.