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
- Brings the music to life and makes it fun to listen to
- Has all the good qualities of a DHT SET amplifier
- Has enough power to make Westminsters jump when the music calls for it, and even at very loud levels—it doesn't get stressed
Takeaway: The Leben CS660P is a good amplifier that brings music to life and makes listening fun. It has enough power for demanding speakers and has the good qualities of a DHT SET amplifier.
What are hifi reviews useful for? (1) Identifying products you should demo in person at a dealer. (2) Learning which products reviewers unanimously praise as the best they've heard (this means they probably are legitimately great). (3) Identifying a product's attributes that satisfy your idiosyncratic needs and tastes. Beyond that, we often discount what reviewers say because they heap praise on most products—and are often apprehensive about publishing strong criticism or comparisons between products. Further, they seldom have more than a few products on-hand, often relying on their memories to compare past products. Always listen for yourself.
All
CS-660P
reviews
[{"title":"Leben CS660P","link":"https://www.6moons.com/audioreviews/leben4/amplifier.html","source":"6 Moons","datePublished":""},{"title":"Leben CS660P - Wow!","link":"https://jeffsplace.positive-feedback.com/leben-cs660p-wow","source":"Positive Feedback","datePublished":"2010"},{"title":"The Leben CS660P Amplifier and EH KT90 Vacuum Tubes - Update: CS600 with the KT90","link":"https://jeffsplace.positive-feedback.com/leben-cs660p-amplifier-eh-kt90-vacuum-tubes","source":"Positive Feedback","datePublished":"2011"}]
An excellent review of a great product
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Publisher
/
3/1/2022
An excellent review of a great product
Publisher
/
3/1/2022
Video Review
Manufacturer details
Features
Specifications
- Tubes Compliment: (4) KT-66, (EL34/6CA7 - Option) (4) 6CS7 (1) 6CJ3
- Output Power: Stereo 40W x 2 (KT-66) at 1KHz, Monaural 80W X 1 (KT-66) at 1KHz
- Frequency Response: 10Hz - 180KHz (-3dB)
- Distortion: 0.7%(10W)
- Input Sensitivity: 1.5V at 40W
- Input Impedance: 100K Ohms
- Output Impedance: 4/6/8/16 Ohms (Selectable)
- Power Consumption: 230W
- Weight: 17.0 Kgs (37.5 lbs)
- Dimensions: 415 (W) X 480 (H) X 320 (D) mm
Description
One of Mr.Hyodo's favourite KT66 based power amplifiers is the QUAD II, (The QUAD II has recently been re-launched due to the demand from audiophiles) M Hyodo has now decided to design a new power amplifier using the same KT66 tube but incorporating high-end audio grade components, far superior to those used in the original QUAD design.
M Hyodo has now decided to design a new power amplifier using the same KT66 tube but incorporating high-end audio grade components, far superior to those used in the original QUAD design.
Release Timeline
Manufacturer Site
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:
- The brand's amplifiers are often described as having a "tube-like" sound, characterized by warmth, richness, and a relaxed presentation, yet still delivering clarity and detail.
- Leben products, designed with careful consideration of total musical balance, are intended for "music lovers" and prioritize listener relaxation and enjoyment.
- Leben integrated amplifiers have an uncanny ability to work with a diverse range of speakers.
Select products
Select product comparisons
RS-30EQ PHONO PREAMPLIFIER
- Positioning: A dedicated phono preamplifier with a CR-type equalizer focused on precise tone control.
- Description: Uses a high-quality Orient-Core power transformer and GE 12AT7A tubes to achieve a stable, low-noise equalization setup. Compared to other models, its simple design and lower power consumption make it a good choice for smaller rooms and budgets, with functionality tailored for accurate phono playback.
CS-300F PRE-MAIN AMPLIFIER
- Positioning: A compact tube pre-main amplifier designed for clear audio signal preparation.
- Description: Uses GE JAN-6197 and a premium Japanese 17EW8 driver tube to deliver clean amplification in a small, efficient unit. Relative to the RS-30EQ, it offers additional pre-main functionality while maintaining a straightforward tube sound, suiting users with modest space and budget constraints.
CS-600 PRE-MAIN AMPLIFIER
- Positioning: A versatile tube pre-main amplifier featuring dual tube options and extended controls.
- Description: Provides selectable output tubes (6L6GC or EL34) and multiple input options along with a power amp bypass to tailor the sound and impedance for various setups. Compared to the CS-300F, its extra functions and tube switching give users more flexibility and technical refinement.
CS-1000P STEREO POWER AMPLIFIER
- Positioning: A high-power tube stereo amplifier built for large audio systems.
- Description: Uses pentode circuit designs with KT120 tubes and a newly developed Orient-Core output transformer for wide frequency response and robust amplification. When compared to pre-main units like the CS-600, its advanced circuitry and higher power output accommodate larger rooms and higher-end setups.
RS-28CX PREMIUM PREAMPLIFIER
- Positioning: A flagship premium tube preamplifier aimed at achieving refined signal quality.
- Description: Features a CR-type equalizer with GE 12AT7 tubes, an independent power supply, and a dual triode 6CG7 SRPP design that ensures a clean, high-voltage output. In contrast to the CS-1000P, its superior build and technical sophistication address the needs of users with the highest performance demands.
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Avg. Product Price
$500
Used For Sale
2
Available (Scroll Down)
Brand Popularity
276
of 900+
Badges
Top 50 Brand
Top 250 Brand
Products Listed
10
Founding Year
1995
Our take on the brand
Leben is a hifi brand known for its hand-built amplifiers that use rare vacuum tubes like the NOS GE JAN 6197 and 17EW8, which create a distinctive sound signature. Their amplifiers require unusually long run-in times of up to 600 hours and offer unique tube-swapping flexibility, allowing users to fine-tune their sound to their preferences.
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Brand Page
Our interview with the brand
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What are your favorite tracks for showcasing the strength of your products?
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Used
Leben
All of the Brand's Used Products
What if you spend more?
Topping
LA90
799
799
/
10
Reviews
Topping Audio is a measurement-focused hifi brand that developed its own proprietary PSRM DAC architecture and NFCA amplifier topology to achieve exceptionally low distortion levels. Their products, from the flagship D90 III Discrete DAC to entry-level interfaces like the E2x2, use advanced technologies like custom I/V conversion stages and high-feedback Class B designs to deliver clean, accurate sound reproduction.
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Our summary
Product Strengths
- Delivers a clean and detailed sound, allowing listeners to hear nuances in recordings
- Offers good instrument separation and imaging
- Has a low noise floor, creating a 'black background' and enhancing the listening experience
- Compact size for an A-B amplifier
- Does not have RCA inputs, requiring XLR or TRS balanced connections
Product Considerations
- May not have enough power for inefficient speakers or large rooms
- External power supply 'brick' is large
- No remote control
Comparisons (according to reviewers)
- The LA90 has a more neutral sound than Cambridge Audio AXA25, which is cleaner and more detailed
- The LA90 comes close to Benchmark AHB2's performance, but does not outperform it in bass impact and soundstage size, and the AHB2 also has more protection systems
- The LA90 offers more vocal clarity and fuller bottom end than Schiit Vidar, but the Vidar is more exciting on top
- Emotiva A1's have more power
Takeaway: The Topping LA-90 Discrete is a small amplifier that produces very clear sound with good detail, making it great for those who already have balanced audio equipment. It could be a nice upgrade for those seeking to hear all the subtleties in their music.
Video review
Our take on the brand
Topping Audio is a measurement-focused hifi brand that developed its own proprietary PSRM DAC architecture and NFCA amplifier topology to achieve exceptionally low distortion levels. Their products, from the flagship D90 III Discrete DAC to entry-level interfaces like the E2x2, use advanced technologies like custom I/V conversion stages and high-feedback Class B designs to deliver clean, accurate sound reproduction.
Product Page
Product Page
Topping
LA90 (Discrete)
799
799
/
9
Reviews
Topping Audio is a measurement-focused hifi brand that developed its own proprietary PSRM DAC architecture and NFCA amplifier topology to achieve exceptionally low distortion levels. Their products, from the flagship D90 III Discrete DAC to entry-level interfaces like the E2x2, use advanced technologies like custom I/V conversion stages and high-feedback Class B designs to deliver clean, accurate sound reproduction.
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Product Strengths
- Impressive specs and measurements showcase extremely low noise and distortion
- Clean and transparent sound aims for a neutral reproduction of music
- Compact size and sleek design make it suitable for small spaces
- CNC machined aluminum chassis allows for maximum thermal flow to keep the unit running cool
Product Considerations
- Included external power supply is large and heavy, which can be a challenge to hide
- Power output may be limiting, especially with demanding speakers and for high dynamic range tracks
- Bass performance, while tight and controlled, may lack sub-bass extension and impact for some listeners
- Lack of a remote control limits its convenience as an integrated amplifier
Comparisons (according to reviewers)
- The Discrete version matches the Topping LA90 IC based unit's exemplary performance, but betters it in power handling
- The Topping LA90 comes close to the Benchmark AHB2 in noise floor and detail retrieval, but the AHB2 has more power, impactful bass, and a bigger soundstage
Takeaway: The Topping LA90 is a compact and technically proficient amplifier that delivers a clean and transparent sound and with impressive specs. It is best suited for those with efficient speakers and a preference for accurate sound reproduction without coloration.
Video review
Our take on the brand
Topping Audio is a measurement-focused hifi brand that developed its own proprietary PSRM DAC architecture and NFCA amplifier topology to achieve exceptionally low distortion levels. Their products, from the flagship D90 III Discrete DAC to entry-level interfaces like the E2x2, use advanced technologies like custom I/V conversion stages and high-feedback Class B designs to deliver clean, accurate sound reproduction.
Product Page
Product Page
Expand Details
Our summary
Product Strengths
- Bass performance is taut, detailed, and well-dampened
- Delivers a neutral presentation overall
- Has a solid steel chassis and milled aluminum faceplate
- The A1 is able to drive low impedance speakers with power and grandeur
- Produces 200 watts into 8 ohms and 325-350 watts into 4 ohms
- Only has a single line-level RCA-style input
Product Considerations
- Audible tweeter hiss may be present at idle, especially with highly efficient speakers
- High frequencies are not as smooth at the edges, exhibiting just faint traces of grain when listening at above-average levels
Comparisons (according to reviewers)
- Vs Rotel 1592 MkII amp: A1 is notably quieter and more detailed
- Vs Crown XLS Drive Core 2 amps: A1 is equally neutral in tone, has a lower noise floor, and a more consumer-friendly design
- Vs Schiit Vidar: A1 has a larger soundstage
Takeaway: The BasX A1 monoblock amplifier delivers good power and a neutral sound signature. It is a great option for those looking to expand an existing AVR or build a cost-effective hi-fi system.
Video review
Our take on the brand
Emotiva is a direct-to-consumer hifi brand that enables audiophiles to customize their amplifier configurations through a modular "Build Your Own" approach, using their Differential Reference design to minimize noise and distortion.
Product Page
Product Page
Arcam
A5
699
699
/
6
Reviews
Arcam is a hifi brand known for its unique Class G amplifier technology, which uses multiple power supplies that switch based on demand to achieve both high efficiency and pure Class A sound at low volumes. Their AV receivers and processors stand out for their use of Dirac Live Bass Control technology, which precisely optimizes subwoofers to improve in-room performance and reduce room modes.
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Our summary
Product Strengths
- Pleasant, smooth, and relaxed playback
- More insight and tightness in the music
- Much insight into sound and musical structure
- A fresh and modern-looking product with a clean and unfussy exterior, which looks simple yet elegant
- Manages a difficult balancing act superbly—forgiving enough not to emphasise the shortcomings of limited partnering equipment, yet still having the insight and transparency to make the most of more capable signals
Product Considerations
- The front panel display lacks crispness due to the 'frosted' finish
- The speaker terminals don't offer a great deal of space
- The back panel itself shows a certain amount of flexibility, which is a little worrying in terms of longevity
- The power on paper is a little optimistic
Comparisons (according to reviewers)
- Vs Atoll IN50: The Atoll plays a bit bigger, but Arcam gives more insight and tightness
- Vs Cambridge Audio Azur 840A: The Arcam A5's midrange and voice reproduction that the Cambridge just couldn't quite match
Takeaway: The Arcam A5 is a well-rounded performer that plays music enjoyably without getting in the way and is affordable, feature-rich and uncomplicated. It is a great amp for someone looking for a balance of performance and features.
Video review
Our take on the brand
Arcam is a hifi brand known for its unique Class G amplifier technology, which uses multiple power supplies that switch based on demand to achieve both high efficiency and pure Class A sound at low volumes. Their AV receivers and processors stand out for their use of Dirac Live Bass Control technology, which precisely optimizes subwoofers to improve in-room performance and reduce room modes.
Product Page
Product Page
What competes at this price?
Fosi
HD-A1
219
/
Released
RMS 50watts x 2(8 ohms, 20 Hz - 20 kHz, 0.02% THD) for 2-16ohm speakers. Similar to the HDAM circuit, adopts TOSHIBA 2SA1943 *2 and 2SC5200 as amplifier output chip to get HI-FI sound quality; Home HiFi amplifier, Sturdy, Aluminum enclosed amp makes it perfect for projects and DIY audio applications.
Fosi Audio makes quality hifi accessible worldwide by offering a diverse range of amplifiers, preamps, and DACs that blend modern engineering with vintage-inspired design. Their products are engineered for versatility and power, serving both audiophiles and gamers with impressive performance at competitive prices. With a strong reputation built on solid reviews and customer focus, Fosi Audio stands out as a go-to brand for enthusiasts seeking exceptional sound without breaking the bank.
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Our Summary
Product Strengths
- Very well-built and feels solid and heavy for its size
- Uses high-quality components such as Japanese Alps potentiometer, Omron relay, Nover Gold Audio capacitors, and Toshiba transistors
- Has a toroidal transformer that is considered overkill for its power output, which is a positive thing
- Has a warm sound signature, sometimes described as tube-like
Product Considerations
- Lacks a volume indicator on the knob
- Only has one set of RCA inputs, which may limit connectivity for some users
- Some reviewers found the 50 watts per channel to be lacking punch with certain speakers
- Has no remote, digital inputs, streaming capabilities, or phono stage
- The gold color of the chassis may not appeal to everyone
Comparisons (according to reviewers)
- Fosi Audio HD-A1 is slightly cleaner with a lower noise floor than the Emotiva A300, but lacks the punch
- Paired with infinity intermezzo 4.1 T speakers, the Fosi Audio HD-A1 sounds better than the Marantz nr1200 powering Sony SSCS5 speakers
- The Fosi Audio HD-A1 has a similar clean, powerful class A/B signature as the Emotiva A300, but with a touch of warmth
Takeaway: The Fosi Audio HD-A1 is a compact and powerful amplifier with high-quality components and a warm sound. It could be a great entry point into hifi audio.
Video review
Our take on the brand
Fosi Audio makes quality hifi accessible worldwide by offering a diverse range of amplifiers, preamps, and DACs that blend modern engineering with vintage-inspired design. Their products are engineered for versatility and power, serving both audiophiles and gamers with impressive performance at competitive prices. With a strong reputation built on solid reviews and customer focus, Fosi Audio stands out as a go-to brand for enthusiasts seeking exceptional sound without breaking the bank.
Product Page
Product Page
Parasound
ZC ZAmp V0.3
299
/
Released
2023
The Parasound ZAmp v3 is a compact and versatile stereo amplifier, offering high-quality amplification in a space-saving design. With 45 watts per channel at 8 ohms, the ZAmp v3 is perfect for small audio setups, custom installations, and multi-room systems. Its reliable performance and efficient operation make it a go-to choice for both home and commercial environments.
Parasound amplifiers are a favorite among hi-fi dealers because they offer a ton of power and performance without hitting crazy price levels. Designed by John Curl, their hifi and home theater amps are known for clean, neutral sound and an ability to power just about any system with ease. Sure, you can find better amps, but they come with serious diminishing returns. For a lot of people, Parasound hits that sweet spot where you feel like you’ve reached the endgame without spending a fortune.
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Our Summary
Product Strengths
- Compact size and respectable heft make it suitable for desktops and small spaces
- Clean and clear sound with good detail retrieval, leaning slightly towards warm, but not overly so
- Enough power to drive moderately sensitive speakers well, especially in nearfield setups
- Features a headphone jack that shunts power from speaker outputs, and gain adjustments for customized sound
- Offers versatile connections for multi-room setups, including power triggers and loop outs
Product Considerations
- Treble presentation is on the forward side of neutral, with a little extra energy, which may not suit all preferences
- Speaker terminals are close together, which may cause issues with shorting if using spades or thick bare wire
- Not ideal for very high efficiency speakers due to a potentially audible noise floor
- May lack dynamic punch with low sensitivity speakers in larger listening spaces
Takeaway: The Parasound ZoneAmp V3 is a well-built and compact amplifier that offers a clean and detailed sound, suitable for desktop or small room use. Its versatile features and surprising sound quality make it a great option for those seeking a no-nonsense amplifier.
Video review
Our take on the brand
Parasound amplifiers are a favorite among hi-fi dealers because they offer a ton of power and performance without hitting crazy price levels. Designed by John Curl, their hifi and home theater amps are known for clean, neutral sound and an ability to power just about any system with ease. Sure, you can find better amps, but they come with serious diminishing returns. For a lot of people, Parasound hits that sweet spot where you feel like you’ve reached the endgame without spending a fortune.
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Burson
Funk
491
/
Released
2021
Hi-Fi companies are spoiling headphone enthusiasts with a wide range of choices, but they often overlook near-field audiophiles who listen to speakers in small studios or from their desktops. Instead, near-field audiophiles are left with subpar Class-D amps or active speakers. Alternatively, they have to settle for larger Class-AB amps that disrupt the aesthetic of their setups. The Burson Funk breaks that rule by offering a combination of exceptional performance and a design that fits seamlessly into any living space.
Burson is a hifi brand recognized for its modular op-amp design that allows users to easily swap components to customize their sound signature.
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Our Summary
Product Strengths
- Good sound quality, especially in the midrange, leads to vivid and well-formed vocals
- Versatile, it works well with both efficient headphones/IEMs and moderately powered speakers
- Compact design and good build quality, with the chassis acting as a heatsink
- Ability to roll op amps allows users to customize the sound signature
- Ample power for most headphones and nearfield speaker setups
- Only one RCA input, which may be limiting for some users
Product Considerations
- Speaker amplifier power (35-45W) might be insufficient for power-hungry speakers or larger rooms
- The base model op amps are sonically inferior to upgrade options
- Mild turn-off thump present
Comparisons (according to reviewers)
- The Funk has a narrower but deeper soundstage with better imaging and layering than the Arylic A08 Pro
- The Funk has superior imaging, but less potential power output depending on the Arylic's power supply than the Arylic A07/A08 Pro
- The Funk is preferred for desktop speaker setups with Vivid opamps when compared to Schiit Aegir
Takeaway: The Burson Funk is a solid choice for people wanting good sound from both their headphones and speakers in a single, convenient unit. The ability to change the sound by swapping op amps is a welcome feature for those who like to tinker and upgrade.
Video review
Our take on the brand
Burson is a hifi brand recognized for its modular op-amp design that allows users to easily swap components to customize their sound signature.
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Fosi
ZA3
129
/
Released
2023
The next generation balanced dual-mode Class-D power amplifier. Fosi Audio's first amplifier supporting both stereo and mono modes.
Fosi Audio makes quality hifi accessible worldwide by offering a diverse range of amplifiers, preamps, and DACs that blend modern engineering with vintage-inspired design. Their products are engineered for versatility and power, serving both audiophiles and gamers with impressive performance at competitive prices. With a strong reputation built on solid reviews and customer focus, Fosi Audio stands out as a go-to brand for enthusiasts seeking exceptional sound without breaking the bank.
Expand Details
Our Summary
Product Strengths
- Great value for the money and an attractive price point
- Balanced input and single-ended RCA input
- Op amps are swappable
- Compact form factor
- Versatile with stereo and mono mode
Product Considerations
- The volume control was found to be touchy by some reviewers
- The included power brick is quite large, almost as big as the unit itself
- The binding posts are small
- The RCA input sounds inferior to the XLR input
- The amplifier does not high pass the mains when a subwoofer is plugged in
Comparisons (according to reviewers)
- Vs Fosi Audio V3: ZA3 is considered a more mature version with stylistic elements and new features like balanced inputs and mono mode, with a naturalness in the tonal quality
- Vs SMSL AO200 MKII: AO200 MKII delivers better clarity, definition, and resolution of the sound
Takeaway: The ZA3 is a versatile and compact amplifier that offers great value, especially for those starting their audio journey. Its ability to be used in both stereo and mono configurations and the option to upgrade components make it a flexible choice for various setups.
Video review
Our take on the brand
Fosi Audio makes quality hifi accessible worldwide by offering a diverse range of amplifiers, preamps, and DACs that blend modern engineering with vintage-inspired design. Their products are engineered for versatility and power, serving both audiophiles and gamers with impressive performance at competitive prices. With a strong reputation built on solid reviews and customer focus, Fosi Audio stands out as a go-to brand for enthusiasts seeking exceptional sound without breaking the bank.
Product Page
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Expand Details
Our Summary
Product Strengths
- Excellent build quality, featuring a CNC milled aluminum chassis and durable construction
- Achromatic Audio Amplifier (AAA) technology by THX, aiming for transparent sound reproduction without coloration
- Relay volume control provides precise channel matching
- Plenty of power to drive a wide range of headphones, from sensitive IEMs to demanding planars
- Balanced XLR inputs and outputs
Product Considerations
- No pre-amp output
- The notched volume control might not be to everyone's liking
- Gets quite warm during use, especially with the SU-9 DAC stacked on top
- Some reviewers noticed a clicking noise when adjusting the volume
- The three-feet design may not be as stable as a four-feet design
Comparisons (according to reviewers)
- Vs. SMSL SP200: Better unit at repelling noise, with a higher signal-to-noise ratio and lower total harmonic distortion—completely solved the SP200's issue with not having a pitch-black background
- Vs. Benchmark HPA4: Very close to the HPA4 in performance, with some minor differences observed only with high-end headphones
Takeaway: The SMSL SH-9 is a well-built and powerful headphone amplifier with a clean, transparent sound. It is a good choice for audiophiles looking for an accurate and detailed listening experience.
Video review
Our take on the brand
SMSL, a Shenzhen-based hifi brand, stands out for its use of advanced chipsets like Infineon's MERUS and ES9039Q2M, which have been objectively verified to deliver exceptionally low noise and distortion levels. The brand has earned acclaim from value-conscious audiophiles.
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