
However, since then, the PRS 1.5 preamplifier has undergone significant improvements. It’s now at Version G. Fortunately, for owners of existing PRS 1.5s, JMF Audio offers an upgrade path to keep their preamps current. However, this does require your amplifier to be shipped back to its birthplace in Anould, in north-eastern France. The change is too extensive to be performed by a dealer or distributor.
So, what’s changed? At its core is a new linear power supply module, which JMF Audio calls ‘PLS’. It uses technology previously found in the company’s power amplifiers, featuring tried-and-tested toroidal transformers. The ‘tried-and-tested’ part isn’t just fluff; JMF Audio claims that 14 prototypes were put through listening tests until the right balance of functionality and musicality was achieved. This PLS system includes a product-specific AC filter and sophisticated DC regulation in the supply path.
In improving the power supply, JMF Audio also updated the power distribution circuitry to match, enabling new audio boards in the preamplifier’s output stage and providing 10dB more gain than its predecessor. There are a host of other changes, but these are the headline changes that make their mark on sound quality.
Rolls-Royce
The HQS 6002 is the smallest amplifier in the JMF Audio range. It’s also the only stereo (well, dual-mono) power amplifier the company makes. Technically, that makes it the company’s ‘entry-level’, but the build quality, performance, and price make that term absurdly redundant. Instead, the HQS 6002 is ‘sufficient’ for those not requiring large mono power amplifiers to drive exceptionally difficult loudspeaker loads. That said, the 220W amplifier can deliver almost 550W per channel into a 2Ω load, so ‘sufficient’ is used in the Rolls-Royce sense (Rolls-Royce famously never discussed engine performance in its cars, simply stating the power was ‘sufficient’ to convey its owners around in quiet luxury).

Power amplifiers were the brand’s launch pad, with founder Jean-Marie Fusilier producing highly respected studio electronics from 1985. These sit in some of the finest studios worldwide. While the baton passed from father to sons, and the amps moved from studio to home, the same performance and reliability criteria were carried forward in the line. The HQS concept means, in essence, high-voltage circuits with high current output and high energy reserves.
First among equals
Once again, what applies in the HQS 9001 applies equally to the HQS 6002. It uses proprietary hand-soldered, multi-layer 24-ct gold boards, with the company’s LDA mono linear driver boards, essentially a refined version of that original circuit from more than 40 years ago. It features a servo-controlled coupling system (known as ‘DCS’… no relation) and this, with the ‘DPO’ direct output circuit, makes the signal path between stages a zero inductance, capacitorless link.
This meets a multiple-transistor block known as ‘MTP’, in which each selected transistor in the output stage has its own biasing and thermal compensation circuit. That’s as close to fail-safe as it gets in audio, extending the long-term life expectancy of the amplifier and speaker. However, this isn’t just about robustness; independently calibrated transistor biasing delivers more (and improved) Class A output.
Like the preamplifier, the balanced-only power amplifier is also upgradable, with models dating back to Version B able to be upgraded to the latest Version G architecture. As with the preamplifier, the amplifier’s version is indicated on a small panel on the rear of the chassis. In the HQS 6002, Version G includes new high- and low-voltage power supplies for the driver boards. In addition, the power supplies offer greater isolation, with a new mechanical assembly for the power transformer. There are new passive components in the output stage and new transistors in the driver stage. Finally, the internal wiring has been completely revised. While not point-to-point, the HQS 6002 does feature many hand-wired interconnections, so this last change is extensive.
Beyond ‘built like a tank’
Often, audio reviewers describe products as being ‘built like a tank.’ That doesn’t seem quite right here. Tanks aren’t as well-built as JMF Audio amplifiers. The company never forgot its studio roots and builds amplifiers with a ‘belt and braces’ approach. Externally, they have thick cabinets that exude a sense of solidity, and this is matched by an internal architecture that borders on the obsessive. These are unfeasibly well-made amplifiers, the kind of amplifiers that last lifetimes.
In the spirit of the Entente Cordiale, these French amps would get the seal of approval of that most British of engineers, Isambard Kingdom Brunel. The Victorian civil and mechanical engineer built the Clifton Suspension Bridge, Paddington Station, the Great Western Railway and more. Brunel built things to last, and if he were alive today, he’d likely be a JMF Audio customer (and be celebrating his 220th birthday).
I can’t speak of the run-in time for these amplifiers, as they were the UK distributor’s personal demonstration samples. But that ties in with the ‘unfeasibly well-made’ aspect of these amplifiers; had the distributor not mentioned they were ‘demo stock’, I would have thought they were new. OK, so no distributor is going to have these products picking up dents and scratches by bouncing around in the back of a car, but few products look this good fresh out of the box.
Remember reality
It takes a few minutes for your ears to acclimatise to the JMF Audio sound. More accurately, it takes a few minutes for your ears to remember what real music sounds like, after you’ve been listening through systems with the brightness turned up! From a foundation of deep, powerful bass, you swiftly notice subtle musical cues and spatial elements that place this amplifier combination in the top tier.
Everything sounds so ‘right’ and so ‘real’ that it highlights how many amplifiers… don’t. There is no edgy forwardness or mellifluous warmth, no ‘bwompy’ accented beats or ‘more piano than a piano’ exaggeration. And that absence is beguiling; it means that when you play something with a piano – or a ‘bwompy’ beat – that’s what you hear, with as little as possible added or taken away. While this is a supposed goal of good audio, the JMF Audio amplifiers highlight that it is a goal “more honoured in the breach than the observance.”
Pretentious use of Hamlet
Stepping back from the pretentious use of Hamlet in a review, listening to the JMF Audio combination once more draws you into the music, without exaggeration or emphasis. That’s a bit of a double-edged sword for an artist; Taylor Swift’s ‘exile’ from folklore [Republic] was a clever, well-recorded way around the COVID-19 lockdowns, with Bon Iver’s Justin Vernon adding vocals from the other side of the continent. Given the strictures of the time, the sound is three-dimensional and detailed, with excellent piano, slightly close-mic’d vocals and plenty of detail. It also highlights just how thin Swift’s voice can be. The JMF Audio sound doesn’t emphasise that, but neither does it hide it. What came as a bit of a surprise is that it adds a sense of vulnerability, which was intended but often lost.
Moving around the record collection, there’s always a pervasive sense of realism to the JMF Audio sound. That’s a performance that stays with you long after you turn the music off. The power is always there, and there’s never a sense of the tank running dry, but the dynamic shading is not brightly lit. Pianist Alexander Toradze is perhaps the best way to explain this. His powerful, big-handed playing style is often portrayed as all dynamics (in fact, you often come away from his playing of something like Prokofiev’s Piano Sonata No 7 feeling sorry for the piano), yet the metered approach is full of subtlety and nuance, with something approaching ‘micro-crescendos’.
Impressive, not onslaught
His playing still has the breathtaking intensity and force, but where it so easily sounds like ‘onslaught’ on some systems, here you get Prokofiev’s jazz influences coming through. It’s an impressive performance, but on the JMF Audio pairing, it’s the pianist, not the system, that does the impressing.
From memory (and careful checking of the listening notes), the difference between the HQS 6002 and HQS 9001 is minor unless used with big, powerful speakers playing big, powerful music. I played the same Mogwai track (‘I’m Jim Morrison, I’m dead’ from The Hawk is Howling [Wall of Sound, appropriately enough] and it had the same range, power and intensity. It was maybe closer to ‘musical suntan’ than the ‘musical sunburn’ of the HQS 9001, but the teeth-loosening glory of that track is still extremely well preserved.
However, all of these descriptions of sonic performance expressed through tracks played is an almost perfect expression of how the JMF Audio PRS 1.5 and HQS 6002 don’t work. This isn’t about running through a set of ‘best of audiophile’ tracks or highlights of musical performance. These amps play the long game. You listen to whole albums for musical enjoyment. Or, to commemorate the 10th anniversary of Bowie’s death, you play Hunky Dory, from beginning to end, then play ‘The Bewlay Brothers’ again because it’s such a great track. You don’t feel the need to spend hours playing the entire David Bowie catalogue (although the non-fatiguing nature of the amps means you can do just that), but the listening experience is so thoroughly satisfying, there’s no need for musical gluttony.
No more churning
Last time, my sole criticism of the JMF Audio models was ‘the absence of bragging rights’. This time, it’s no different. But I’ll add one other, related observation. I think there are many audiophiles who prefer the journey to the destination. Seeking out the best-sounding audio is a never-ending churn through high-end audio brands, so whenever someone talks about ‘Preamp X’ or ‘Power Amp Y’, you can speak about it with confidence. Having a system you can live with for the rest of your days isn’t a goal; it means you no longer have a chip in the game. But if you want to stop searching and stay listening, JMF Audio’s amplifiers are the answer.
JMF Audio’s PRS 1.5 preamplifier and HQS 6002 power amplifier are hand-built for the client. They aren’t bespoke products, but neither is there a warehouse full of amps waiting to be dispatched. As a result, it might take three months or more for your amps to be built. It’s worth the wait, as what you receive at the end is world-class audio, at the absolute cutting edge of what you can do with audio amplification… and built to last into the next millennium. So, answering the question at the top of this feature, if what you really want from your high-end amplifier is outstanding performance and a lifetime of listening, why aren’t you putting your name down with JMF Audio?
Technical specifications
PRS 1.5
- Type: solid-state line preamplifier
- Inputs: 3× XLR balanced, 3× RCA unbalanced
- Outputs: 2× XLR balanced, 1× RCA unbalanced
- Input impedance: >10kΩ (XLR and RCA)
- Output impedance: 50Ω
- Max Input level: 9V (XLR)/4V (RCA)
- Maximum output level: 10V into 10kΩ load
- Frequency Response: 1Hz-150k (intentionally limited for RF immunity) 20Hz–20kHz (±0.0dB)
- Signal to noise ratio: 120dBA (+22dBu)
- THD+N: 0.0002% typ. (+22dBu, 1kHz)
- Channel separation: >100dB
- Finish: Black or Silver
- Dimensions (W×D×H): 48.2 × 32.6 × 10.6cm
- Weight: 14kg
- Price: £36,000, €34,900, $39,000
HQS 6002
- Type: solid-state stereo amplifier
- Input: XLR
- Outputs: 6mm loudspeaker terminals, WBT for spades/4mm
- Power output: 220W/8Ω, 400W/4Ω, 550W/2Ω
- Frequency response: 3Hz–20kHz ±0.1dB at 250W/4Ω, 100kHz ±1dB
- THD+N: < 0.01% at 1kHz a 250W/4Ω, 100Hz ±1dB
- Signal to noise ratio: 110dB, 20Hz-20kHz unweighted
- Finish: Black or Silver
- Dimensions (W×D×H): 48.2 × 53.9 × 14.9cm
- Weight: 34kg
- Price: £42,500, €42,550, $45,000
Manufacturer
JMF Audio
Homepage – https://www.jmf-audio.com
Products – https://www.jmf-audio.com/amphqs6002 and https://www.jmf-audio.com/prehome
Contact – https://www.jmf-audio.com/contact
Distributor
Audioskies
audioskies.com
UK dealer
Lotus Hi-Fi
lotushifi.co.uk
+44(0)788 785 2513
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