Note that this is a discontinued product. You may want to visit the brand's page here to browse their newer products.
What reviewers think
Magazine reviewers and YouTubers have tried this product—so we've summarized their strongest opinions below.
Product Strengths
- High power output
- Great sound
- Low noise
- Connectivity options
Product Considerations
- Lack of protection circuitry
- Users should never make any changes to input or output connections while the amplifier is turned on
- Under no circumstances should the speaker terminals be short-circuited or either of the speaker terminal(s) be connected to ground
- The storage capacitors inside continue to be 'powered-up' for many minutes after it's turned off
- The Adcom GFA-585se proved to be unstable into a highly reactive load, meaning it is not recommended for use with electrostatic speakers
Takeaway: The Adcom GFA-585se provides a lot of power and great sound for the price. It's a good option for anyone looking for a high-quality amplifier.
Compared to their other products
We think it's helpful to understand how this product fits into the brand's full lineup (below). To learn more about these products, visit the brand's page.
LUNA
- Positioning: An entry-level, portable wireless speaker designed for ease of use and modern connectivity.
- Description: Offers a distinct blend of wireless connectivity, long battery life (22 hours), and a design by Jacob Jensen that emphasizes simplicity and style.
GIA-275 SERIES II
- Positioning: A compact, integrated amplifier combining both amplification and preamplifier functions with a range of connection options.
- Description: Features a built-in high-resolution DAC and Bluetooth V4 with aptX support, offering an all-in-one solution for digital and analog sources.
GFP-915
- Positioning: A stereo preamplifier engineered for high-fidelity signal routing and clean, transparent audio performance.
- Description: Features a 192KHz/24bit internal DAC along with phono connectivity and tone controls, ensuring accurate and detailed audio reproduction. Compared to the integrated approach of the GIA-275 and the high-power focus of the GFA-565se, it is best suited for users prioritizing detailed preamplification in setups where refined signal control is essential.
GFA-565SE
- Positioning: A high-power amplifier built for demanding high-end audio systems with a focus on driving challenging speaker loads.
- Description: Delivers 250W into 8 ohms with high current drive, backed by a robust power supply that maintains low distortion even with complex loads. In contrast to the more integrated and preamplifier-centered designs of the GIA-275 and GFP-915, it is targeted at users needing maximum power output and performance.
Read the reviews

Manufacturer's notes
- Output Power: 450 watts into 8 ohms, 600 watts into 4 ohms, 1000 watts into 8 ohms bridged
- Frequency Response @ 1watt, 8-ohms: +0. -0.25dB, 10Hz to 20kHz
- Power Bandwidth (0.25dB): 20Hz to 20kHz
- Input Impedance: 22,000 ohms
- Input Sensitivity: 2.681V rms, 450 watts into 8 ohms; 126 mV rms, 1 watts into 8 ohms
- Damping Factor: >800, 20Hz to 20kHz
- Dimensions: 10-3/4" x 19" x 19-3/4" (275mm x 482mm x 502mm)
- Weight: 70.4lbs (32kg)
- Shipping Weight: 79.2lbs (36kg)
- Power: 120VAC & 230VAC / 50-60Hz
Our take on the brand
Used
ADCOM
What if you spend a bit more?

The A35.8 is Primare’s most powerful and flexible multi-channel amplifier, designed to serve the needs of virtually any high-performance multi-channel system through its ability for each pair of channels to be bridged to mono for an incredible level of power delivery and system building options, including 1500 watts of total output in a fully bridged bi-amped stereo configuration. Shipping June 2022!
Our Summary
Product Strengths
- The A35.8 provides eight channels of 'unimpeachable Class D power in a fairly compact and very flexible package'
- Flexible configuration options for power output to speakers are available, such as bi-amping and bridging
- Each stereo pair can be bridged separately to make four times 375 watts (8 Ohms) from the eight times 150 watts
- Fault-free sound quality
- High quality fit and finish
- The A35.8 offers flexible connectivity options
Product Considerations
- The 20-amp power inlet is the seldom-seen variety with three horizontal blades
- The speaker output posts are spaced too widely for dual-banana plugs
- Cabling can be tricky
- A high current power cord is needed
- Lower gain is present, though this doesn't necessarily need to be an issue
Comparisons (according to reviewers)
- Vs NAD M28, the A35.8 gets you one more channel and more versatility for a 10% price increase
- Vs Benchmark AHB2, the Benchmark presented a more neutral tonal balance and undistorted soundstage
- Vs NAD C 298 stereo amplifiers, the Primare seemed slightly more forward, often conveying an appealing liveliness
Takeaway: The A35.8 power amplifier is a flexible and versatile product worth considering for anyone seeking a high-quality multi-channel setup. Its ability to bridge channels offers many ways to configure your speaker system.
Video review
Our take on the brand
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Our Summary
Product Strengths
- The EAR 890 produces 70Wpc in stereo, and can be bridged to 140W in monoblock
- Neutral sound that gets out of the way and lets the user enjoy the music
- Complex and dense music textures are handled with ease, and dynamically demanding passages are sailed through
- Articulate midrange
- Detailed and realistic bass
Product Considerations
- Removing/installing tube cages is difficult and time-consuming
- The loudspeaker binding posts are positioned too close to the output transformers, making it hard to tighten them properly
- Some assembly work appeared amateurish, specifically the use of silicone in various locations, such as fastening chassis wires
- The amplifier can operate quite hot
- May not have as much bass impact compared to solid state amps
Comparisons (according to reviewers)
- The EAR 890 monoblocks achieve SET-like definition along with the authority and swagger necessary for most full-size speaker systems, when compared to Cary Audio 300B SET amps
- The EAR 890 is as textured as the top LAMM designs, but with noticeably better neutrality and more power
- The EAR 890 surpassed the deHavilland KE50As with a more articulate midrange, producing more color and separation in the microtones of instruments
Takeaway: The EAR 890 is easy to set up and sounds good with very little tweaking, making it easy to just sit back, relax, and enjoy the music. It's a good choice for people who want a tube amp that is both musical and powerful for their home listening experience.
Video review
Our take on the brand

Our Summary
Product Strengths
- Delivers amazing quality of sound and detail
- Bulletproof amplification
- Has a rhythmically soulful sound with a tremendously rich and natural midrange
- The A51's bass is well-defined, extremely textured, and robust
- With 250 watts on tap, the Parasound A51 will power virtually anything
Product Considerations
- Due to its class A/AB design, the A51 does get a bit warm and should be installed in a properly ventilated space and/or rack
- The A51 is large and heavy, and is best moved and/or positioned by two people
Comparisons (according to reviewers)
- Compared to Rotel, the Rotel makes the M&K Sound system slightly bright with a bit of sibilance, while the Parasound is more neutral
- Compared to Acurus A250, the Parasound had tighter bass, which is probably attributed to a better damping factor
Takeaway: The Parasound Halo A51 is a high-performance amplifier with great sound quality, detail, and build quality, making it an excellent choice for audiophiles and home theater enthusiasts. Its ability to deliver power and control to speakers makes it a valuable addition to any high-end audio system.
Video review
Our take on the brand

The AGD “TEMPO” Stereo Amplifier is the new addition to our state-of-the-art Hi-End Power Amplifiers family. TEMPO is our first compact Stereo Amplifier utilizing the same unique technology of Gallium Nitride Power-Stage design already in use with all its Hi-End AGD siblings.
Our Summary
Product Strengths
- GaN technology allows for efficient power usage, with 94% of energy being turned into sound
- Compact size challenges the notion that high-quality amps need to be large
- Design and packaging create pride of ownership
- It can be run in bridged mode to deliver 400 watts into one channel
- Stability and ability to handle complex impedance loads
Product Considerations
- The slight sonic signature may not be for everyone
- If truly outrageous amounts of power are needed to drive speakers, a second AGD Tempo amp might be needed to run in a bridged configuration
- High-frequency noise was discovered when XLR cables were not connected between them
- Power cords can make a large difference, the included power cord doesn't flatter the amp
- Some traditionalists may find it hard to accept that it's a Class-D amplifier
Comparisons (according to reviewers)
- Compared to Peachtree Audio GaN400, the AGD Tempo reports to have better overall specifications
- Compared to Parasound Halo A21+, the AGD Tempo is simply superior
- Compared to Bricasti M30 monoblock amplifiers, the level of which the most subtle detail exists approaches reference Bricasti M30 monoblock amplifiers
Takeaway: The AGD Productions Tempo is a cutting-edge amplifier that offers a new take on audiophile amplification and rivals more expensive amplifiers. It can drive speakers easily while being energy efficient.
Video review
Our take on the brand
What else competes at this price?

Our Summary
Product Strengths
- Tangible feeling of pure power and speed of delivery
- Clean, neutral performance
- Fulsome, fast, and fun sound
- Thrillingly responsive to the dynamics of a sound mix
- Drive needed to partner floorstanders hungry for power
Product Considerations
- Chassis depth is a considerable 533mm
- Low-end delivery may not be the best compared to some rivals
- Green/blue aesthetic might not be for everyone
Takeaway: The MI502 is a powerful and responsive amplifier suitable for various applications and it looks good. It offers clean and neutral performance, making it a great choice for someone wanting to get a new amplifier.
Video review
Our take on the brand

Our Summary
Product Strengths
- Impressive clarity, tighter bass, and more pinpoint accuracy of instruments in the soundstage compared to the SET 600
- Great dynamic range, definition, and transparency, while maintaining the nuances and details of the original music recording
- Designed to run cooler and last longer
- Relative bargain for its performance level
- Always sounded musical, a presentation which engaged the listener with music rather than calling attention to the gear
Product Considerations
- A pair of amplifiers can provide enough power to damage almost any speaker system if carelessly used
- Tone and timbre were not as rich and voluptuous as the reviewer tends to prefer, there seemed to be less meat on the bone
- One of the five-way speaker binding posts spun when tightening spades, but there were no electrical or other performance issues from that
Comparisons (according to reviewers)
- Compared to Audio by Van Alstine SET 600, the DVA M750 has more power, a quieter presence, more clarity, tighter bass, and even more pinpoint accuracy of instruments in the soundstage
- Compared to Pass Labs XA30.8, the M750s are slightly more intense sounding
Takeaway: The DVA M750 Monoblock is a powerful amplifier with finesse and a large, quiet soundstage presented with exceptional clarity. It delivers a compelling and engaging musical experience.
Video review
Our take on the brand

Our Summary
Product Strengths
- The M23's build quality feels solid and elegant, with impressive small design details
- The sound is striking in its purity and clarity
- It offers up to three levels of gain, switchable on the back panel, to best fit the system
- It provides a clear sound without sounding hard
- It features Purifi Eigentakt Class D amplification, which provides virtually unmeasurable distortion levels
Product Considerations
- The bass is clean but may be perceived as a little on the cool side and not as 'wompy-sounding'
- The M23 is not a forgiving amplifier that makes everything sound sweet and wonderful—it's not for those seeking a soft and mellow sound
- Bridging with speakers below 5 or 6 ohms is not recommended, as the amp will current limit and potentially shut down
- The reviewer found ergonomical challenges using fancy speaker cables in bridged mode due to wide terminal spacing
- The capacitive touch power button can accidentally trigger
Comparisons (according to reviewers)
- Vs Bel Canto C6i: The M23 offered a layer of refinement and better reproduction of the recording space
- Vs Pass XA25: The M23 had more transparent sound and detail, especially in the treble and upper mids, but lacked the organic quality of the XA25
- Vs HiFi Rose RS 520: The M23 sounded cleaner and had better separation/depth, HiFi Rose seemed to have an EQ built-in, emphasizing midrange and bass
- Vs NAD C298: The M23 is more neutral, deals with decay more naturally, and has better casework, making it look high-end
- Vs Anthem M1 monoblock amplifiers: The M23 was slightly more transparent throughout the entire frequency range
- Vs Bryston 4B 3: The Bryston had more grunt but the M23 is more neutral
Takeaway: The NAD M23 is a powerful and precise amplifier that delivers clean and clear sound, making it a great choice for audiophiles who want to hear their music as accurately as possible. It is especially well-suited for those looking to build a high-end system around a quality preamp or DAC.
Video review
Our take on the brand

Our Summary
Product Strengths
- Delivers ample, clean, and dynamic power to all channels, ensuring speakers reach their full potential
- Designed by John Curl, featuring Class A/AB circuitry for a balance of warmth, richness, efficiency, and punch
- Pleasing sound for dialogue and music, with very high-quality and detail
- Versatile, suitable for both movies and music, with a low noise floor for quiet passages and great transparency—that doesn't color the sound
- Built to last, with high-quality internal components
- Signal-sensing power-on mode can be fussy and may require adjustment
Product Considerations
- Super heavy and large, potentially requiring rearranging a system or dedicated rack space
- Only available in anodized black
Comparisons (according to reviewers)
- The A52 Plus has bigger parts and bigger power than the Outlaw Model 5000, including balanced XLR connections
- A52 Plus is the 'teenager' compared to the elder Parasound A51
- Parasound A52+ sounds better, is more accurate, and more powerful than the Denon receiver's amplifier section
Takeaway: The Parasound A52+ Halo is a versatile and powerful amplifier that delivers clean, dynamic sound for both home theater and music systems, with a build quality designed to last. This is a worthy investment for audiophiles and home theater enthusiasts who seek high-quality audio performance.
Video review
Our take on the brand

Our Summary
Product Strengths
- Exceptionally transparent sound output quality
- Exceptionally powerful, capable of outputting 500W into a 4-Ohm load
- Delivers a remarkably clean, transparent sound with very little noise or distortion
- The amplifier's ability to reproduce bass is awe-inspiring and delivers deep, powerful bass without distortion
- Runs cool and weighs very little for its sound output, making it easy to move around
Product Considerations
- Options can be a little pricy, such as the 12v trigger and RCA inputs
- The Starkrimson Stereo Ultra may lead to further system upgrades
- Depending on your sources, the Starkrimson Stereo Ultra will play exactly what you feed it, good or bad, and if your source components are slow, the Starkrimson Stereo Ultra will not speed them up
- Power on only after all connections are properly made, including the power cord, analog inputs, and speaker outputs, and wait five minutes after powering it off before removing any of the connections
Comparisons (according to reviewers)
- Compared to the Krell S550i integrated amp, the Starkrimson Stereo Ultra showed a much faster and finer resolution of the upper frequencies of the human voice and a far greater ability to play more of the microdetails of a recording
Takeaway: The Starkrimson amplifier is well-built and provides a level of speed and transparency to hifi music that makes listening to music very fun. Its GaN modules can be upgraded and it is available in several configurations.
Video review
Our take on the brand
Note that this is a discontinued product. You may want to visit the brand's page here to browse their newer products.
What reviewers think
Magazine reviewers and YouTubers have tried this product—so we've summarized their strongest opinions below.
Product Strengths
- High power output
- Great sound
- Low noise
- Connectivity options
Product Considerations
- Lack of protection circuitry
- Users should never make any changes to input or output connections while the amplifier is turned on
- Under no circumstances should the speaker terminals be short-circuited or either of the speaker terminal(s) be connected to ground
- The storage capacitors inside continue to be 'powered-up' for many minutes after it's turned off
- The Adcom GFA-585se proved to be unstable into a highly reactive load, meaning it is not recommended for use with electrostatic speakers
Takeaway: The Adcom GFA-585se provides a lot of power and great sound for the price. It's a good option for anyone looking for a high-quality amplifier.
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