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
Bloggers and YouTubers have tried this product—so we've summarized their strongest opinions below. Links to full reviews follow.
Product Strengths
- Considered a 'true classic' in Opera Audio Consonance's amplifier portfolio
- Sound quality is significantly above its price level
- Class-AB tube amplifier, inspired by Jadis amplifiers
- Tube change is simple due to the auto-bias function
- Straightforward to use with a solid toggle switch, three RCA inputs, and a loudspeaker terminal
Product Considerations
- Minimalistic equipment might not be for everyone
- A solid metal cage is supplied to protect the tubes from damage
Comparisons (according to reviewers)
- The M100 Plus is oriented, in terms of circuit design, at Jadis
Takeaway: The M100 Plus is a classic tube amplifier that delivers great sound for its price and is easy to use, especially for those who appreciate tube sound. It is worth considering for tube engineering enthusiasts.
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M100 plus
reviews

Manufacturer details
- Output Power: 2 x 40W at 4/8 Ohm (both channels operating)
- Tube Complement: 4 x EL 34, 2 x 6N8P, 2 x ECC81 (12AT7)
- Frequency Response: 6Hz – 60kHz
- Signal-to-Noise Ratio: 90dB
- THD: 1% (40 Watt)
- High Level Inputs: 3 pairs RCA/Cinch
- Input Sensitivity: 290mV
- Speaker Connections: 2 sets of terminals for max 1 speaker (min. impedance 4 Ohm) per channel via 4mm Ø banana plugs, spade lugs
- Power Consumption: 90W at full power
- Weight: 17kg
- Included: Tubes, tube cage, power cable, manual, remote control
- Warranty: 24 months
Brand highlights
Taking a step back to look at reviewers' thoughts of the brand's entire lineup—not just this product—what stands out most is the following:
Select products
Cyber 20 MK2
- Positioning: A headphone amplifier and preamplifier focused on personal, small-room audio.
- Description: Uses a tube-based design that brings a warm and clear sound in a compact package. Compared to the phono and full amplifiers in the lineup, its simpler circuitry and lower power output suit users with smaller setups and tighter budgets who need personal listening without extensive connectivity.
Reference 40 MKII
- Positioning: A phono amplifier dedicated to turntable setups.
- Description: Features a high-quality step-up transformer and low-noise circuitry that preserves the detail of vinyl records. Compared with the headphone amplifier and full amplifiers, its design is specialized for vinyl playback.
M100 Plus
- Positioning: A compact full amplifier that blends tube warmth with solid-state reliability.
- Description: Combines tube elements with modern power delivery in a streamlined chassis that provides balanced audio performance. Compared to the specialized phono and headphone units, its moderate pricing and versatile functionality cater to users looking for a general-purpose amplifier.
Cyber 880i
- Positioning: A high-power full amplifier aimed at demanding performance environments.
- Description: Integrates advanced tube circuitry with digital control features to offer refined and powerful sound output. Compared to the less powerful M100 Plus and the more specialized units, its robust build and greater output make it suited for larger rooms.
Linear 1
- Positioning: A dedicated preamplifier built for high-end, integrated audio systems.
- Description: Offers a meticulously engineered signal path that cleanly boosts audio without adding distortion. Compared to the integrated amplifier models, its focus on preamplification, expanded connectivity, and precise control appeals to users with complex systems.
Our take on the brand
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Our summary
Product Strengths
- Very fine sense of detail, especially in the midrange and treble
- Forward presentation makes instrumentalists and vocalists seem to step out in front of the speakers
- The controls have a luscious feel
- The amplifier is beautifully made with that thick gleaming fascia exciting unequivocal admiration
- Rhythmic nuances and microdynamics propelled musical lines along with foot tapping gusto
Product Considerations
- There's a small degree of hum from the mains transformer
- Can be fatiguing to listen to for long periods, especially with aggressive recordings
- Lacks the last word in texture and extension in the bass
- Doesn't present sharply defined three-dimensional images
Comparisons (according to reviewers)
- Vs Blue Circle BC3/BC3.1 and Muse 150 monoblock amps, EAR 834 has softer and less extended bass, slightly less overall detail and clarity, and a somewhat foreshortened soundstage
- Vs E.A.R. 802 preamp combined with a CLASSÉ CA 100 amplifier, the 802/CA 100 combination was quite similar in sound to the 834
Takeaway: The EAR 834 is beautifully made, looks great, and has a special sound that can really draw you into the music and make you feel like you are there. It is an integrated amplifier with a design that invites extended listening sessions.
Video review
Our take on the brand
Our summary
Product Strengths
- Beautifully constructed with a distinctly vintage look and high-quality components, offering pride of ownership
- Sweet sounding amplifier with a lovely clear presentation and great tonal character
- Provides a rich valve fluidity and charm, making music a wonderful experience from any angle
- Has a bass boost selector which gives users the option of boosting the bass response by 0, +3 or +5dB
- Point-to-point soldering
Product Considerations
- Only 15W of power, requiring careful speaker selection based on sensitivity and room size
- Does not have a phono stage built-in, so a separate phono stage is required for vinyl
- Lacks remote control
- Some audiophiles might find it 'dull', 'lacking detail', or even 'sluggish'
- Gets quite hot, so needs space around it
Comparisons (according to reviewers)
- Vs Leben CS600: Noticeably lacking the CS600's wide-open presence and rock solid imaging
- Compared to a similarly priced solid-state amp, instruments had a depth and sense of solidity, fullness and presence that simply made them seem more real
- Vs Unison Research amp: The Unison Research sounded faster and more open and dynamic
Takeaway: The Leben CS300XS brings valve goodness to music with its beautiful design and clear sound, making it a great starting point for a cracking system. It focuses on the music, offering a wonderful listening experience.
Video review
Our take on the brand
Product Strengths
- A lovely, lush sounding performance that's hard to dislike and sounds smooth but far from lifeless, delivering high levels of detail in a cohesive and musical manner
- A sympathetic performer, it prefers to play to its inferior partnering equipment's strengths than overly expose their weaknesses, as many hifi audio examples tend to do
- It can cater for a wide range of headphones and connections and it is a benchmark product that's highly recommended
- Zero musical flaws to report and is nearly perfect in execution
- A stunning design to the eye and ear, it is overall a wonderful addition for the perfectionist who wants the very best performance at home or even in the studio
Product Considerations
- The volume control operation lacks linearity, making it hard to make subtle changes in level
- No input selector, so one should only connect one type at once
- On some samples, the volume control is loose and wiggles in its chassis housing
- The octal AC socket is a bit of an odd choice, considering most users might prefer IEC
- The depth, snap and weight of the low end was dynamic and exciting on some recordings and less than stellar on others
Comparisons (according to reviewers)
- Vs Musical Fidelity M1 HPA—the MHA200 has a lush warmness to the music that brings strings to life in a way that makes the M1 HPA sound somewhat sterile in comparison
- Vs EAR Yoshino HP-4 reference—the MHA200 was a touch brighter than the reference, though only slightly
Takeaway: The MHA200 is an enjoyable product with a rich, balanced, and powerful sound, that's more forgiving than most rivals and can be enjoyed for years to come. This headphone amp is perfect for personal listening, design, and operation that will work its magic.
Video review
Our take on the brand
Product Strengths
- Delivers a lovely, lush-sounding performance that is hard to dislike, described as smooth but far from lifeless, delivering high levels of detail in a cohesive and musical manner
- Creates an astonishing space and three dimensionality to the sound, reminiscent of high-end systems
- Features a rich, balanced, and powerful sound that is more forgiving than most rivals
- Superbly made and engineered with solid casework
- Largely unphased by most headphones and can drive a wide range of headphones
Product Considerations
- Volume control operation lacks linearity, making subtle changes in level difficult
- Really needs a balanced source and headphones to deliver its best performance
- Has no input switching, so balanced XLR and single-ended RCA inputs cannot be used simultaneously
- Lacks a remote control for volume adjustment
Takeaway: The MHA200 is a well-built headphone amplifier that delivers a refined and musical listening experience with a spacious soundstage. It is ideal for users who want a dedicated headphone amplifier and appreciate the rich sound of tubes.
Video review
Our take on the brand
What competes at this price?
Our Summary
Product Strengths
- Great for headphones, providing a lot of gain
- The DAC section uses the ESS 9038 Pro chip
- Can be used as a preamp in a regular system
- Has independent left and right tone controls
- Features a surround mode that enhances two-channel listening, making the walls disappear
- Connectivity options in the back are single-ended RCA
Product Considerations
- The balance knob has no detent
- The unit resets to analog input one every time it is turned off
- Some find the slope switches unclear
Comparisons (according to reviewers)
- The DAC section is quite close in sound quality to PS Audio DAC
- The surround mode is preferred over the Black Ice F360
Takeaway: The recgviNbkfbno9pQR offers great sound and many ways to tweak it, so it can change the sound to be exactly how the listener likes it. It works well with both headphones and speakers, so it is a good choice for people who like to listen in different ways.
Video review
Our take on the brand
Our Summary
Product Strengths
- Appealing aesthetics and a very positive initial impression
- Full and warm sound is enjoyable for headphone listening without causing stress
- Exceptional build quality and workmanship
Product Considerations
- 200-300 hours of burn-in time is needed before definitive statements about sound quality
- Sound is a bit closed and small initially, suggesting it might need time to open up
- High-gloss finish might attract fingerprints
Takeaway: The Line Magnetic LM-84IA is a cute and well-made little amplifier that seems to produce a full, warm sound. It could be a very enjoyable amplifier for someone who wants an amplifier with appealing aesthetics.
Video review
Our take on the brand
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