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.
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Manufacturer details
- Continuous Power Output: 2*45W @8ohm
- Total Harmonic Distortion (THD): <0.02%
- Frequency Response: DC - 100kHz ±0.5dB
- S/N Ratio: 124dB
- Gain RCA: 23.5dB
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
ASK Integrated:
- Position: An integrated amplifier combining analog signal processing with built-in digital streaming.
- Description: Uses a balanced DC-servo design and a built-in streamer/DAC option that make it simple to set up and use. Compared to the ODEN-II and other models in the range, it offers versatile connectivity and performance suited for smaller rooms and buyers looking to balance quality with budget.
ODEN-II:
- Position: A mid-range integrated amplifier focused on improved analog performance.
- Description: Uses a refined discrete amplifier circuit that helps keep signals clean and clear. Compared to the ASK Integrated, it offers a simpler digital setup and a more straightforward expansion path, while not reaching the pure Class A operation of higher models like the Ymer Class A III.
Ymer Class A III:
- Position: A premium integrated amplifier built around a pure Class A design.
- Description: Runs on a pure Class A design that delivers very low distortion and a neutral sound, ideal for detailed listening in critical setups. In contrast with the ASK and ODEN-II, it sacrifices extra digital functions for a more linear signal path.
Loke:
- Position: A versatile integrated amplifier engineered for modern connectivity and balanced performance.
- Description: Combines an efficient switching power supply with a well-tuned analog stage to meet various listening situations. Compared to the ODEN-II and Ymer Class A III, it maintains a balance between digital integration and analog warmth.
Brage:
- Position: A flagship integrated amplifier that represents the highest performance in the lineup.
- Description: Uses top-quality components and an advanced fully balanced design to provide exceptional signal clarity and extensive functionality, matching the needs of the most demanding setups. In comparison with the ASK, ODEN-II, Ymer Class A III, and Loke, it stands out with superior build quality and connectivity.
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Used
Bladelius
What if you spend more?
Linear Tube Audio is proud to present the ZOTL40 Reference+ amplifier. A worthy flagship and the most refined manifestation of David Berning’s ZOTL design. The latest iteration of LTA's EL34-based amplifier, the ZOTL40 Reference includes a new chassis, component improvements, and is supplied with NOS EL34s that take this 50 watt-per-channel amp to a new level. The ZOTL40 uses EL34 tubes, one of the best midrange tubes ever invented, so it has very solid midrange and authoritative punch.
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Our summary
Product Strengths
- Finely nuanced, single-ended power amp that manages to toe the line between a classic tube sound, and a modern, solid-state A/B amplifier
- Amazingly lightweight due to the elimination of the normal tube output transformers
- The quietest tube amp the reviewer has ever had the pleasure to use, with no tube rush, hum, or crackling, even at idle
- Exhibits midrange mastery, while having exceptionally wide frequency response, and a neutral-naturalness
- An extremely quiet noise floor was even more obvious with a passive linestage, with space between the notes, and a greater level of transparency
Product Considerations
- The sound is changeable, and decidedly affected by what is driving it
- Dynamics were more constricted and the stage somewhat smaller when driven by a passive linestage
Takeaway: The ZOTL40 Reference is a great amp that makes music sound beautiful and is quiet while doing it. It will allow for hours of enjoyable listening without fatigue.
Video review
Our take on the brand
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A Push-pull power amplifier with 50 watts per channel stereo utilising eight EL34 (four per channel) into 4, 8 and 16 ohms. Self-biasing operations with balanced or unbalanced inputs. Chrome facia.
Our summary
Product Strengths
- More musically convincing, more detailed, more harmonious, more linear, and more transparent than any other similar EL34 design at any price.
- Piano music is most perfect and quick, with purity of tone and tambour with proper richness and speed.
- Silent with totally black backgrounds, micro and macro dynamics are unrestricted and natural.
- Reveals its glory quickly due to its transparency.
- Excellent fit and finish and it worked right out of the box.
Product Considerations
- Thick or lean sounding cables will make the 534 sound thick or lean, and it needs top-quality isolation and support.
- The reviewer recommends buying the 534 new as they haven't auditioned the original from the beginning of the century.
- The only major flaw is that it doesn't have 500 watts per channel, but a custom one can be ordered for a very high price.
Comparisons (according to reviewers)
- Vs E.A.R. 890: The 890 is more robust and powerful, but not more convincing if your speakers don't need the power.
- Vs Cary Audio Custom 300B: The 534 is vastly superior.
Takeaway: The E.A.R. 534 is a musically convincing and transparent amplifier that reveals nuances in music. It is easy to place, beautiful to look at, and can make vocals and piano sound exquisite.
Video review
Our take on the brand
Loke, the god who brought the world to an end. Hopefully this 90W pure class A mono power amplifier will not do the same… Loke is a fully balanced mono power amplifier with very low feedback design. The feedback that is applied is in current mode for the lowest possible transient distortion. A custom toroidal transformer is used for the lowest noise and the capacitors have ultra-low esr. All of this makes it possible for you to listen to the music and not to the amplifier.
Product Strengths
- Strong, energetic sound with a close foreground and focus on timbres.
- The upper midrange and the bass are rendered well, saturating elements and making them feel closer to the listener.
- Refined sound that is spacious and dynamic.
- Built with high-quality electronic components and a custom-made power transformer.
Product Considerations
- The bass doesn't go very low nor is extremely well controlled, offering a good average in its price range.
- The top of the chassis vibrates, suggesting it could benefit from damping.
- Using spade connectors with the speaker terminals may be difficult due to the close proximity of the sockets.
Takeaway: The Bladelius LOKE offers a balanced presentation, combining density, openness, speed and a nice timbre without brightening or warming up the sound too much. It is a great amplifier that can drive most loudspeakers with style and handle various music genres with ease.
Video review
Our take on the brand
For those who demand the best, but want to keep things simple. The Z40+ Integrated amplifier delivers the magic, realism, and 3D soundstage of our patented ZOTL technology, all in one (gorgeous) package. A single-component solution, the Z40+ Integrated amplifier incorporates the acclaimed ZOTL40+ Reference power amplifier, a Berning-designed preamplifier, and LTA’s digital control system–beautifully packaged in a Fern & Roby-designed case. The Z40i+ generates up to 51 watts per channel. This means the Z40i+ can easily drive speakers with sensitivity ratings at or above 85db for critical listening. For smaller rooms or non-critical listening, it can drive speakers rated down to 80db. In any configuration, listeners enjoy startling realism, plentiful bass, low noise, plus gorgeous mids and highs.
Product Strengths
- Balanced and musically persuasive presentation, making it convincing across various music genres
- Superb control coupled with a timbrally rich sound and expansive sound image—wonderfully nuanced and inviting
- Transparent, detail-oriented sound that doesn't sacrifice the body and soul of the music
- The design uses David Berning's ZOTL technology, aiming to deliver tube richness with solid-state resolve and speed
Product Considerations
- May require higher sensitivity speakers to perform optimally, especially in larger rooms
- The lack of dedicated subwoofer outputs might be a drawback for some users
- Its transparent nature means that poorly mastered recordings will be revealed as such
Comparisons (according to reviewers)
- The Z40+ leans to a richer and more fluid sound, whereas the SoulNote A-2 is more concerned with resolution and clarity
- Compared to Pass Labs XP30 preamp and a First Watt F7 power amp, the Pass Labs sounded warmer, fleshier, and bigger, however, the Linear Tube Audio amp had more life to it
- Compared to Pass Labs XP30 preamp and an XA25 Pass Labs amplifier, the Linear Tube Audio has more density to the sound and is more solid sounding than the XA25 with the XP30
Takeaway: The Z40+ offers a unique combination of tube and solid-state qualities, providing a detailed yet musical listening experience. Its design and high-quality components aim to deliver a transparent and honest sound, suitable for a wide range of music and audiophiles who appreciate sonic purity
Video review
Our take on the brand
What competes at this price?
Our Summary
Product Strengths
- Top-quality finish and material selection
- Beautifully smooth and particularly natural sound reproduction
- Little sound of its own, so no typical tube coloring
- Tight bass
- Excellent price-performance ratio
Product Considerations
- Tubes require occasional extra attention
- Tubes need to be replaced every few years
- The power amplifier requires more space due to heat dissipation
Takeaway: The Trafomatic Evolution Line One and Elegance offer top-class pre- and power amplifiers with star quality for the price of an excellent integrated amplifier. Any music lover should quickly be able to embrace these two products.
Video review
Our take on the brand
Our Summary
Product Strengths
- The EVO 300 runs EL34 tubes at a conservative 440 volts, increasing tube life and reliability
- Adaptive auto bias ensures tubes work together in their perfect linear operating position, reducing distortion and extending tube life
- Point-to-point wiring gives the product an intrinsic value and increases longevity
- High-quality components like TACMAN resistors, Nichicon capacitors, and Swiss-made silver-plated oxygen-free copper wiring are used
- It includes an AC Offset Killer to reduce mechanical hum from the power transformer
Product Considerations
- EL34 tubes are not as durable as KT120s
- If KT-150 tubes are used, the tube cage cannot be installed, because the tubes are too tall
- Switching from ultralinear to triode operation cuts the power in half, requiring volume adjustment for fair comparison
- The reviewer recommends using the speaker tap that 'sounds best' rather than relying on the speaker's impedance rating
Takeaway: The EVO 300 Power Amp is a high-quality amplifier designed for everyday use and long-term reliability. Its flexible design lets you experiment with different tubes and sound signatures.
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
- Combines the tonal qualities of tubes with the power of solid-state amplification, combining the great aspects of both technologies
- Delivers a clean, detailed, dynamic, and musically insightful sound
- Well-built with high-quality components, including point-to-point wiring in the preamp section
- Includes a headphone amplifier powered by the same internal amp as the speakers, not an op-amp
- Multiple inputs and functions, including home theater bypass, subwoofer output, and tape output
Product Considerations
- Lacks balanced inputs and a pre-amplifier output
- The volume control can be very sensitive at low levels
- Optional MM phono stage requires additional purchase
- Requires good ventilation due to running warm
Comparisons (according to reviewers)
- Versus Cambridge Audio Edge NQ / 2 x Gold Note PA-10 setup, the EVO 300 Hybrid delivers a level of engagement that was captivating, the improvement over the normal setup slightly disconcerting
- Versus Schiit Jotunheim, the PrimaLuna bested it, with a slightly cleaner sound that let a touch more detail through
Takeaway: The PrimaLuna EVO 300 Hybrid offers a balance of tube warmth and solid-state power to give listeners the best of both worlds. Its detailed sound, robust build, and versatility make it a worthwhile addition to any audiophile's system.
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
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