Ecler AURA-4B900 4-Channel 4 x 900W Class-D Power Amplifier - 100V & 2/4/8 Ohm
The Ecler AURA-4B900 is a 4-Channel 4 x 900W Class-D Power Amplifier with transformer isolated output, low and high impedance compatibility, dual and bridge mode operation, anti-clip system and auto standby.
Delivering high-power multi-channel amplification for the most demanding multi-zone fixed installation environments.
The Ecler AURA-4B900 is the most powerful four-channel model in the AURA series, stepping up to 4 x 900W RMS at 4 Ohm for the largest and most demanding multi-zone fixed installation audio systems. Like all AURA series amplifiers, it has been engineered with the highest levels of robustness and reliability for long-lasting performance in continuous professional operation.
A notable feature that distinguishes the AURA-4B900 from the lower-powered AURA models is its Class D amplifier with transformer isolated output — providing enhanced electrical isolation between the amplifier and connected loudspeakers for improved safety and compatibility across complex installation environments. With an impressive 80% efficiency rating, the AURA-4B900 also delivers its substantial output power with minimal waste heat, making it a practical and energy-conscious choice for large-scale installations.
Flexible Output Configuration for Low & High Impedance Systems
The AURA-4B900 supports the same broad range of output configurations as the rest of the AURA series but with substantially increased power output across all four channels. In standard dual mode, all four channels deliver 900W into 4 Ohm loads, 450W into 8 Ohm loads and up to 1000W into 2 Ohm loads. In bridge mode, channel pairs deliver an impressive 2000W at 4 Ohm and 1600W at 8 Ohm for demanding mono applications requiring maximum output from a single channel pair. For high-impedance distributed audio installations, the AURA-4B900 supports both 70V and 100V line operation at 900W per channel, switchable via rear panel dipswitch per channel pair alongside dual/bridge and low/high impedance mode selection. An input link to CH1 selector per input allows individual channels to be linked to the first input for simplified mono or zone distribution applications.
Practical Control & Security Features
The AURA-4B900 retains the same practical control and security features as the rest of the AURA range across all four channels. Front panel volume control knobs per channel can be locked via rear panel switches, preventing unauthorised level adjustment in public-facing or unattended installations. Each channel can be switched between standard volume control and bypass mode. An auto standby function — selectable from the front panel — automatically places the amplifier into a low-power standby state during signal inactivity, consuming just 2.3W in standby for highly energy-efficient operation despite the amplifier's substantial output capability. A front panel power on/off switch and dedicated auto standby on/off LED provide clear and convenient system status monitoring.
Comprehensive Protection & Monitoring
The AURA-4B900 is equipped with the same full suite of protection systems as the rest of the AURA series. DC protection, HF protection, short-circuit protection, clip limiter and thermal protection all work together to safeguard both the amplifier and connected loudspeakers during continuous high-power operation across all four channels. The transformer isolated output provides additional protection and electrical isolation for connected loudspeakers and installation wiring. Front panel LED monitoring covers signal present, clip, protect, standby, thermal and link status per channel and per channel pair, with a unit-level power on LED providing clear overall system status. Twin fans provide active cooling throughout sustained high-power use.
Ecler AURA-4B900 Key Features:
- 4 x 900W RMS @ 4Ω / 2000W Bridge @ 4Ω Per Channel Pair: High-power four-channel Class D amplification delivering serious headroom for the most demanding multi-zone fixed installation audio systems.
- Transformer Isolated Output: Enhanced electrical isolation between amplifier and loudspeakers for improved safety and compatibility in complex installation environments.
- 80% Efficiency Rating: The highest efficiency rating in the AURA range, delivering substantial output power with minimal waste heat generation.
- Four Independent Channels: Individual volume control, input link and output mode selection per channel for flexible multi-zone system design.
- Low & High Impedance Compatibility: Supports 2Ω, 4Ω and 8Ω low-impedance and 70V/100V high-impedance operation via rear panel dipswitch per channel pair.
- Dual & Bridge Mode: Switchable per channel pair between dual stereo and bridged mono operation for flexible system configuration.
- Front Panel Volume Lock: Rear panel switches lock front panel volume knobs to prevent unauthorised adjustment in public-facing or unattended installations.
- Input Link to CH1: Per-channel input link selector for simplified mono or zone distribution applications.
- Auto Standby Function: Automatically enters low-power standby (2.3W) during signal inactivity for energy-efficient operation.
- Anti-Clip System: Protects against clipping distortion for clean, consistent audio performance at all output levels.
- Comprehensive Protection: DC, HF, short-circuit, clip limiter and thermal protection for total reliability in continuous professional operation.
- Euroblock Input & Output Connectors: With anti-pulling locking system for secure, professional-grade wiring in permanent installations.
- Per-Channel LED Monitoring: Signal present, clip, protect, standby, thermal and link status indicators for clear front panel system monitoring.
- Twin Fan Cooling: Active cooling for sustained high-power operation across all four channels.
- Power Factor Correction > 0.95: Highly efficient mains power usage across the full operating voltage range.
- Universal Mains Input: 100–240V AC, 50–60Hz for worldwide installation compatibility.
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Compact 1RU Format: 484 x 44 x 378mm — four channels of 900W in a single rack unit.
View our shipping and delivery information below. All prices include VAT.
Important notice for non-UK orders: Any order being shipping outside of the UK will incur an import tax. See below for more information.
Cut-off Times
Orders must be placed before 3:30pm to guarantee same-day dispatch. Any orders placed after this time are not guaranteed to be shipped the same day, and are more likely to be shipped the next working day.
To guarantee Saturday Delivery, orders must ideally be placed before 2pm.
We operate during office hours, Mon-Fri, 9am - 5pm, and are closed during the weekend.
Orders placed over the weekend or Friday after cut-off will be processed and shipped the following Monday (or Tuesday during bank holidays).
Mainland UK Delivery Charges
Note: Next-day services are classed as working days (Mon-Fri) and do not include weekends. Please choose Saturday delivery if you require the item over the weekend.
Please also note orders with a high number of boxes may be subject to an additional charge.
All delivery options will be available at the checkout stage. Please ensure you add a mobile number to your order for tracking information.
Offshore & International
We ship to Scottish Highlands, Islands, Ireland and the EU. Please see the table below for base prices. Please note that these prices are subject to change based on the number of boxes.
The following postcodes fall under 'Highlands & Islands', and are subject to the above rates/lead time.
- Scottish Highlands: FK17-21, IV1-39, IV52-54, IV63, KW1-14, PA21-40 (excluding PA38), PH19-26, PH30-41, PH49-50
- Scottish Islands: HS1-9, IV40-51, IV55-56, KA27-28, KW15-17, PA20, PA38, PA41-49, PA60-78, PH42-44, ZE1-3
If a UK Mainland next-day service is selected at checkout, please be aware that it won't be sent on that service.
If you require a next-day service to Northern Ireland and the highlands, get in touch so we can assist further.
EU Import Tax
Any goods shipped outside of the UK, over a certain value, will incur an import tax. The cost and rate will depend on the country and the order value.
This is a legal requirement and MUST be paid prior to delivery in order to receive your goods. You will be contacted by the courier once the order is dispatched to pay the fee.
Failure to pay import tax when applicable will result in the order being shipped back to Audio Volt. Any returned goods sent back to us due to non-payment of import tax are NOT ELIGIBLE for a refund on the shipping charge.
You can obtain an import duty estimate here.
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:
- Please keep your order reference to hand. This confirms your original order and gives us the necessary details to authorise the product's return.
- Contact our Customer Services Team on 02476 369890 (or email info@audiovolt.co.uk). We will then send you an RMA number and a returns form, which needs to be completed and sent back with the returned item(s).
- 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.
- 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:
- 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.
- If you have not requested a return within 60 days of receiving an order, we will assume that you are intending to keep it, and we will not authorise a return.
- We always refund the payment according to how the original purchase was made and aim to do so within 72 hours of the return being received by us.
- 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.
- Delivery charges will not be refunded unless the delivered goods are faulty.
- Replacement products are dispatched immediately after the returned goods have been received and accepted by Audio Volt.
- 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.
Any Questions?
If you have any questions about our returns policy, please telephone us on 02476 369890 or email us at info@audiovolt.co.uk.
We operate during office hours, Mon-Fri, 9am - 5pm, and are closed during the weekend.
