Audio T Verdict
The Cyrus 80 PWR is a powerful and flexible Class A/B amplifier designed for listeners who want the control and authority of a dedicated power amplifier.
It can operate as a conventional stereo power amplifier or be switched into bridged-mono mode, allowing a pair of 80 PWR amplifiers to provide separate amplification for the left and right speakers.
Balanced and unbalanced inputs make it straightforward to integrate into different systems, while the full-width design provides a natural visual and performance match for the Cyrus 80 PRE and 80 AMP.
Cyrus 80 PWR Stereo and Mono Power Amplifier
The Cyrus 80 PWR is a full-width Class A/B power amplifier with switchable stereo and bridged-mono operation.
Used in stereo mode, one amplifier powers both the left and right loudspeakers. Switching to bridged-mono mode allows each 80 PWR to power one speaker, providing a clear upgrade route for systems requiring greater scale, control and headroom.
Both balanced XLR and unbalanced RCA inputs are provided, allowing the amplifier to partner a wide range of suitable pre-amplifiers, streaming pre-amplifiers and integrated amplifiers with variable pre-amplifier outputs.
Stereo Operation
- One 80 PWR powers both speakers
- Quoted output of 200 watts in stereo mode
- Separate left and right input connections
- Conventional left and right speaker outputs
- Suitable for a traditional pre and power system
Bridged-Mono Operation
- One amplifier powers one speaker
- Two 80 PWR amplifiers are required for stereo
- Quoted output of 300 watts in mono mode
- Provides greater system scale and headroom
- Requires the correct mono input and speaker terminals
Class A/B Power Amplification
The 80 PWR uses Class A/B amplification, combining low-level linearity with the efficiency and power required to control demanding loudspeakers.
As a dedicated power amplifier, its internal circuitry concentrates on taking the line-level signal from a pre-amplifier and supplying the current and voltage required by the speakers.
Removing source selection, volume control, streaming and digital conversion from the power-amplifier chassis also allows each part of a separates system to be selected and upgraded independently.
200-Watt Stereo Operation
Cyrus quotes an output of 200 watts when the 80 PWR is operated as a stereo amplifier.
In this configuration, the left and right channels are contained within one chassis, making it the simplest route to high-power Cyrus amplification.
Stereo operation is suitable for systems using the Cyrus 80 PRE or another compatible pre-amplifier with variable line-level outputs.
Cyrus does not currently state the loudspeaker impedance used for the published 200-watt figure, so speaker matching should be based on a demonstration and the complete loudspeaker specification rather than headline power alone.
300-Watt Bridged-Mono Operation
A rear-panel switch converts the 80 PWR from stereo to bridged-mono operation, with Cyrus quoting 300 watts in this configuration.
Bridging combines the amplifier’s two internal channels so that they work together to power one loudspeaker.
A complete stereo system therefore requires two 80 PWR amplifiers in mono mode, with one dedicated to the left speaker and the other to the right.
The input and speaker connections differ from conventional stereo operation. The rear-panel labels and manufacturer instructions must be followed carefully before the system is switched on.
Why Use Two Mono Power Amplifiers?
Using one amplifier for each speaker separates the left and right power-amplifier channels into different chassis and power supplies.
This can provide greater available headroom and reduce interaction between the channels during demanding musical passages.
The benefit will depend on the loudspeakers, listening level, room and quality of the source and pre-amplifier. A comparison between stereo and mono configurations is therefore recommended before building a twin-amplifier system.
Balanced XLR Inputs
Balanced XLR inputs are provided for connection to a compatible pre-amplifier such as the Cyrus 80 PRE.
A balanced connection carries the audio signal across separate positive and negative conductors, with a third connection providing the shield or ground.
This arrangement can provide improved rejection of interference, particularly where longer analogue cable runs are required or several powered components are installed close together.
The source must provide a suitable balanced output for the connection to operate as intended.
Unbalanced RCA Inputs
Conventional RCA inputs allow the 80 PWR to partner pre-amplifiers and integrated amplifiers without balanced XLR outputs.
This makes it possible to use the amplifier with a wide range of existing Hi-Fi equipment rather than limiting it to the Cyrus 80 Series.
Only one input type should be selected and connected for each channel. The rear input selector must correspond with the connection being used.
Matching the Cyrus 80 PRE
The Cyrus 80 PRE is the natural separates partner for the 80 PWR.
It provides source selection, volume control, BluOS streaming, analogue and digital inputs, HDMI eARC, an MM/MC phono stage and balanced XLR outputs.
A single 80 PWR creates a conventional streaming pre and stereo power-amplifier system. A second 80 PWR can then be added if bridged-mono operation is required.
Using the Cyrus 80 AMP as a Pre-Amplifier
The
Cyrus 80 AMP
includes variable RCA and balanced XLR pre-amplifier outputs.
These outputs allow its BluOS streamer, DAC, phono stage, volume control and source inputs to feed a separate power amplifier such as the 80 PWR.
The most appropriate connection and speaker configuration should be agreed before installation, particularly where the customer is considering bi-amplification or retaining the 80 AMP’s internal power-amplifier section.
Using the 80 PWR with Other Pre-Amplifiers
The 80 PWR is not restricted to Cyrus pre-amplifiers.
It can be connected to a suitable third-party pre-amplifier, streamer or integrated amplifier providing a variable line-level RCA or balanced XLR output.
A fixed-level source output must not be connected directly unless the source also provides a safe method of controlling volume.
Input level, gain structure and connection type should be considered when combining components from different manufacturers.
Speaker Matching
The 80 PWR is intended for high-performance passive loudspeakers, including models that benefit from substantial power and firm low-frequency control.
Amplifier power is only one part of speaker compatibility. Nominal impedance, minimum impedance, electrical phase, sensitivity, room size and listening distance must also be considered.
Bridged amplifiers can place different demands on the connected loudspeaker load than the same amplifier used in stereo. Mono operation should therefore be confirmed as suitable for the intended speakers.
Speaker Connections
The rear panel provides separate positive and negative binding posts for the left and right channels.
In stereo mode, connect each speaker to its corresponding left or right output while maintaining correct polarity.
Bridged-mono mode uses the specifically labelled mono terminals rather than the conventional stereo connection arrangement.
Switch off the pre-amplifier and power amplifier before changing input, mode or speaker connections.
Full-Width Cyrus 80 Series Design
The 80 Series introduces full-width casework while retaining visual details shared with Cyrus’s compact 40 Series products.
The 80 PWR has a deliberately simple front panel because everyday source selection and volume control are handled by the connected pre-amplifier.
Its sculpted side heatsinks help dissipate heat generated by the Class A/B amplifier section and form an important part of the enclosure design.
Installation and Ventilation
Position the 80 PWR on a strong, level equipment rack with adequate ventilation around its top and side panels.
Do not enclose the amplifier tightly, cover its ventilation areas or place it directly against equipment that also produces substantial heat.
Where two amplifiers are used as monoblocks, each unit should have sufficient airflow rather than being installed in an unventilated stack.
Cyrus does not currently publish the 80 PWR’s dimensions or weight, so compatibility with existing furniture should be confirmed before delivery.
Key Features
- Full-width Cyrus power amplifier
- Class A/B amplification
- Switchable stereo and bridged-mono operation
- Quoted 200-watt stereo output
- Quoted 300-watt bridged-mono output
- Balanced stereo XLR inputs
- Unbalanced stereo RCA inputs
- Rear-panel input selector
- Rear-panel stereo and bridge selector
- Dedicated mono input labelling
- Left and right speaker binding posts
- Dedicated bridged-mono speaker-terminal labelling
- Suitable for compatible pre-amplifiers
- Natural partner for the Cyrus 80 PRE
- Can be connected to the Cyrus 80 AMP pre outputs
- Suitable for single-amplifier or twin-monoblock systems
Frequently Asked Questions
Is the Cyrus 80 PWR an integrated amplifier?
No. It is a dedicated power amplifier and requires a compatible pre-amplifier or integrated amplifier with a variable pre-amplifier output.
Does it have a volume control?
No. Listening volume is controlled by the connected pre-amplifier.
How powerful is the 80 PWR?
Cyrus quotes 200 watts in stereo mode and 300 watts in bridged-mono mode. The manufacturer does not currently state the associated loudspeaker impedance.
Can one 80 PWR power a stereo pair of speakers?
Yes. In stereo mode, one amplifier powers the left and right speakers.
How many amplifiers are required in mono mode?
Two are required for stereo playback, with one bridged 80 PWR powering each loudspeaker.
Does it have balanced inputs?
Yes. It provides balanced XLR inputs as well as conventional unbalanced RCA inputs.
Can I connect it to the Cyrus 80 AMP?
Yes. The 80 AMP provides variable RCA and balanced XLR pre-amplifier outputs. Audio T can advise on the most suitable system configuration.
Does it include BluOS streaming?
No. Streaming and source control are provided by the connected pre-amplifier, such as the Cyrus 80 PRE or 80 AMP.
Can I use it with a non-Cyrus pre-amplifier?
Yes, provided the pre-amplifier has a suitable variable RCA or balanced XLR output and is electrically compatible.
Can every speaker be used in bridged-mono mode?
Not necessarily. The loudspeaker impedance and amplifier requirements should be checked before switching to bridged operation.
Why Buy From Audio T?
- Experienced Cyrus separates specialists
- In-store demonstrations through participating branches
- Help choosing between stereo and mono operation
- Pre-amplifier and system compatibility advice
- Loudspeaker impedance and power-matching guidance
- Balanced XLR and RCA cable recommendations
- Support planning single-amplifier and twin-monoblock systems
- Home demonstration and installation options where suitable
- Ongoing setup and system support
Contact your local Audio T store
to arrange a demonstration or discuss the correct Cyrus 80 PWR configuration for your speakers and pre-amplifier.