Driving the loudspeakers...
Caring for the music...
The JMF Audio HQS power amplifiers
have been acclaimed for their high output power combined with a faithful,
natural rendering of music.
Since 1988, the most influential audio professionals, such as American
studio designer Tom Hidley, and world-class studios
(Nashville, New-York, London, Capri, Tokyo, Paris...) have trusted the HQS power amplifiers to monitor the quality of
the recordings and productions, with great pleasure of listening.
it first met with success in the studios, the JMF Audio
technology was humbly aimed at celebrating music, for all music lovers.
Fusilier designed and built the HQS power amplifiers without the
preconceptions, the marketing considerations, the deadlines or budgets that generally limit commercial designs. Being an expert
engineer in high-frequency, infra-red and power electronics, Jean-Marie
Fusilier approached audio differently, by passion, with pragmatism, and developed
innovative solutions. These set the fundamentals of the make JMF Audio, established
The JMF Audio founder desired
a lively yet controlled rendering for all types of musics... Even with high
sensitivity loudspeakers, this meant significant driving force, precision
and very low noise floor. The tube technology which he used to cherish was
therefore left aside. Regarding the solid state technology, it
was common belief that only a pair of matched output transistors could
lead to musicality, which was still only suitable for intimistic
took up the challenge to design a high output power amplifier offering a
philosophy behind the JMF Audio HQS power amplifiers can be summarized as
> A huge
reserve of energy for instant delivery at the output on fortissimo.
Achieved with the proprietary RPS concept involving bespoke toroidal
transformers and bespoke high performance capacitors.
High voltage electronics for superior headroom and
higher efficiency. A linear amplification by design, a short signal path
starting with a precision trimmed balanced input stage. These are key
features of the LDA driver board, the center piece.
High current output capability for best possible control, allowing the amplification structure not to rely on
compensations such as feedback loops, yet featuring a high
damping factor by nature. The base of the proprietary MTP
philosophy as set in the beginning and still followed today, sometimes
with the exact same components...
the major aspects, the details are of significant importance
regarding the musical result:
their introduction, the JMF Audio HQS power amplifiers have taken
advantage of the long researches of their designer on the
sound neutrality of passive components, semiconductors and materials as well as on the amplification structure allowing
fast response, stability and linearity at every stage.
Audio HQS power amplifiers utilize selected and uncommon components for audio
applications: high frequency precision transistors, matched differential pairs,
components, selected and noble materials...
to the requirements for specific components from the aeronautic, aerospace
and fast-train industries located in France, some companies have
specialized in providing custom parts. Thanks to our initial activities in
high-frequency electronics, as told in the History of the brand,
we have collaborated for over 30 years with such specialists, which
allowed JMF Audio to obtain the bespoke components and parts, especially
passive, that best suited our criteria, for serving music.
HQS 9001 mono
amplifier (one channel)
The JMF Audio HQS power amplifiers are
able to deliver formidable currents, with serenity. Large signals never
happen to mask small signals. Possibly
pointed out that the reaction of the loudspeakers (the counter
electromotive force) was a commonly underestimated phenomenon. The
loudspeakers have to be under control. In living rooms, at moderate
listening levels, the JMF Audio HQS power amplifiers allow an ample
rendering of music, in an absolute comfort.
Audio defines dynamics as linearity down to the lowest levels, especially
when the message is complex. This is another aspect that we consider very
important. Linearity allows the reproduction of the least
details, the subtle ambiances and the wide and coherent natural sound stage as caught at the
recording. A challenge...
especially desirable when enjoying music at moderate levels. The notes
last longer with JMF Audio power amplifiers.
HQS3200-UPM, the mono power amplifiers that propelled JMF Audio in the
world class recording studios in 1988, were renowned for being extremely natural sounding,
revealing the details yet being able to deliver huge currents, providing
a lot of headroom.
The JMF Audio’s HQS power amplifiers
were awarded in Japan as the best audio amplification technology, in every
category. Consequently, JMF Audio never felt necessary to present an
amplifier to a contest in the following 30 years.
models bring the listener yet closer to the artists with precision,
beauty of timbres, nuances and respect of ambiances... The last revision F
introduced for the 30th anniversary of the recognition in Swiss studios
are, in our opinion, a summit.
LDA 3rd generation super linear high-voltage powered
driver board. PGP pure gold. (one channel)
The LDA mono driver board, the
center piece and jewel inside the power amplifier, is in charge of voltage
amplification of the delicate incoming line signal by a factor of over
30dB. Since 1985, the driver stage has featured the innovative and still
unrivaled hand calibrated precision input stage, enabling 100dB of common
mode rejection of interferences carried by the input cables, this means
more than 30 times better than found in professional balanced circuitry. This
parameter having been enhanced by integrating psychoacoustic criteria
starting from 2012.
Un-balanced incoming signals automatically take
advantage of the symmetrical amplifications structure. The proprietary DC
coupling allows a direct signal path (cutoff below 3Hz with offset error
detection). These features have been common to all designs and have taken
advantage of improvements with time, on technical and sound quality
A total of 6 adjustment points require manual calibration after a 100
hour burn-in period on each driver board.
The LDA mono driver board features metal case ulta low noise discrete
components (military grade), bespoke capacitors on the power supplies (made in France), temperature compensated current
biasing. Every components and connectors on the audio path have been selected for their reliability and
on listening for their natural sound characteristics.
The JMF Audio proprietary PGP pure gold finish of the multi layer printed circuit
board is incompatible with the automated processes. The hundreds of components
populating both sides of the board are
hand mounted and soldered one by one by our specialized technicians with JMF Audio's bespoke
solder, using a magnifying glass. A work of art that recalls jewels manufacturing.
HQS 9001 MTP super linear high-current output stages.
PGP pure gold. (one channel)
The proprietary MTP type
output stage, in charge of the signal amplification in current, employs
multiple selected transistors (42 per channel on the HQS 9001) which have
their own biasing (hybrid, class A on small signals since 2009), thermal
compensation, fail-safe circuit. The biasing being independently calibrated to match the transistors and associated driver
Thanks to the naturally stable design of the power amplifiers, the output stages
provide a pure direct path, without the added inductive component that is normally mandatary in solid state
The JMF Audio elements are entirely hand crafted in our workshops and pass severe
tests. Since revision D, every power amplifier has even been verified by listening in our
studios after an operational period of over 100 hours, so as to ensure its
future owner will receive the best.
RPS ultra stable power
supplies. Specifically made to measure capacitors and toroidal
- LDA ultra linear and direct amplification structure (featuring PGP gold).
- DCS servo, direct coupling, no capacitor link on the amplification path.
- DPO direct output design: naturally stable amplification design requiring no output
- MTP output stage: multiple transistors, individually
controlled, 330A capability for HQS9001.
TRB temperature regulated circuits (with quick thermal stabilization starting from revision C)
- PGP specific gold plated analog audio boards (LDA amplification an MTP
- SCD sealed case design
(no dust can enter), passive cooling (option silent heatsink cooling fan)
- Ultra low noise
floor (and cross talk on stereo version).
LSS made to measure dia. 6mm output terminals (120A rated!) with specific
- Automatic detection and protection against input offset, too high
frequency, high temperature, overload.
- Vu meter for input signal magnitude monitoring (switchable starting from
- Hand wired, soldered and mounted. Drastic control and selection of all components.
All models feature the same voltage gain, which definitely facilitates
multi amplifiers setups (active setups).
All power amplifiers are upgradable to the last revision (starting from
revision B, new chassis).
(click on photo to access model page)
* The HQS1050 is based on the same
chassis as PRS1.5 preamplifier and DXC2.2-MKII converter
- Common mode rejection
All models have the same voltage gain (which eases
3 pin XLR - metal housed, gold contacts
100dB CMRR, based on psychoacoustic criteria since 2012
High precision balanced input stage (impedance matched to PRS1.5)
Level metering on bargraph (-15dB to +3dB) (except HQS1050: -3dB,
Input offset, overload and high temperature indicated by LEDs
- Output power RMS
||600W / 8Ω
||1000W / 4Ω
||1700W / 2Ω
|| 3000W / 1Ω
||380W / 8Ω
||700W / 4Ω
||1000W / 2Ω
||250W / 8Ω
||450W / 4Ω
||550W / 2Ω
|| per channel
||150W / 8Ω
||250W / 4Ω
|| on 2013
- Ouput stage current
- Operation load limit
Noise floor and hum
Audio signal coupling
Finishes front panel
Fan unit (HQS9001)
HQS9001: 1Ω (operational) HQS7001/6002: 1Ω (limited)
HQS1050: 2Ω (limited)
(automatic current limiting on permanent loading)
Audio dia. 6mm terminals (120A continuous rated) (adapters to 4mm
additionaly features WBT gold terminals for fork and banana
Full output power and high temperature indicated by LEDs
Better than -125dB (mono) -122dB (stereo) un-weighted 1kHz (meas.
3Hz..100kHz (-3dB) 3Hz..40kHz (0dB)
DC coupled (exclusive DC servo circuitry)
Standby switch on front panel (prior to revision F)
Automatic protection against high frequency large signals
Automatic DC protection below 3Hz
Automatic protection against overheating and input offset
Automatic protection against overload and short circuits
Aluminum machined brushed anodized
walnut laser engraved
483 W x 550 D* x 183 H* mm (HQS9001-F new massive aluminum chassis)
483 W x 500 D* x 140 H* mm (HQS7001, HQS6002)
*without fan unit and including feet
HQS9001-F: 52kg/pc, HQS 7001/6002-F: 25kg/pc, HQS1050-F: 15kg
100V AC, 120V AC, 230V AC (HQS9001, HQS7001, HQS6002 internal
100V AC .. 240V
HQS9001 is equipped with mains voltage supervision circuits and would
not power up may the actual mains voltage be different from the
Silent, automatic and variable speed fan unit, no air path inside
amplifier (no dust).
the 30th anniversary of the JMF Audio's power amplification
Studios, Lucerne, Switzerland
Read the article
It is known by conoisseurs that the JMF Audio power amplifiers have seduced music lovers from all areas for over 30 years. Whether these
experienced audiophiles and sound engineers used to defend
tube designs or whether they used to trust famed brands in solid-state technology, they found in JMF Audio the precision, timbres rightness, amplitude, greatness in the presentation of music.
We are thankful to the enthusiastic JMF Audio instruments-for-the-music owners for their feedbacks,
comments and the wish for some of them to get the information published.
However it has been
limit the comments on this page to just a few. Music enthusiasts are invited to discover and
experience for themselves. JMF Audio would be pleased to guide and
advise a representative.
Please refer to the Contact
page and our Policy.
J-P., France, (HPM500, HQS9001, PRS1.5)
HQS 9001 offer the sweetness of the best tube amplifiers and we can feel
a total control of the speakers [...] they reveal an incredibly
detailed three dimentional soundstage ; a dynamic contrast I had
M. I., Asia
my opinion, my friend owned the best sounding amps on earth: the
HQS3200. Now that I received the HQS 7001, I can say that it is
even better: more detailed, more precision, more punch. Along with
the PRS1.5, CM4 and SR8, the sound result is very very very high
definition... we were schocked" (via e-mail)
A. M., Luxembourg.
HQS9001 provide a more lively music. There is a feeling of comfort... Notes last
noticeably longer, there
is always something to hear..."
B. F., USA, (HQS 6002)
"The sound is imperial, calm. Beyond sound quality, the
facts that the case is sealed and that passing to 230VAC is easy
(for when I'll be back in Europe), give me the feeling that I
purchased an apparatus for a lifetime, without any doubt
regarding my choice."
M.C. (HQS7001 later HQS9001, PRS1.5, DXC2.2-MKII)
the HQS7001 have been in service for two months on my Revel Salon 2.
[...] To my great surprise, even at high level, I have never seen
the least led [vu-meter] light up..." [...] "I listen for
hours!" [...] (via e-mail)
moved to the HQS9001 a few years later: "the most
spectacular is the low frequencies that go down to the basement with
a natural, a precision and an articulation unknown to date. The
overall listening is clear with a depth and a volume that make
forget about the speakers." (via e-mail)
R.Y. (HQS6002, PRS1.5, SR8, CM4), Singapore
been using a Japanese [tube amplifiers] and cables were
[from Denmark] or [from Netherlands]. The most notable difference
was the liveliness of the music, the soundstage and details. Your
amplifier is also quieter." via email (2011)
Mic A., world class studio owner and sound engineer in New York
my visit at Masterfonics in Nashville, when my own
recording studio was built, I took time to run a comparison again and realized that your amplifiers sounded more natural
and accurate, especially in the bass, with a greater sound stage rendering. I have used your
amplifiers since and have placed the preamplifier in front, linked
with your extraordinary modulation cables. [...]" (phone
Carlo Talamona, world class studio owner in Italy
have owned my (JMF Audio) power amps since the early 90's and I
believe they are still on top..." (phone conversation,
Alain Amouyal, classical music composer, world class studio owner,
France. Silcord Productions USA.
for a Fairy Tale", performed by the London Symphony Orchestra,
recorded at Abbey Road, London, post-production and masters controlled with JMF Audio power
N. Stawski, recording/mixing engineer, co-producer, Paris (HQS9001,
PC3, SR8) 2014:
first auditionned and compared your amplifiers in the recording
studio I used to work in. When the time was right to create my own
studio, there was no question about the choice of power amplifiers.
We understood each other. The sound is so precise and soft, easy.
With your monitoring, I hear the space around the musicians, the low
is ultra detailed, this is great for mixing control. [...]"
Major upgrade, 2018. Inheritance from the revision D of the
Read the first impressions in New York studios
LDA signal amplification circuit board. Latest PC3 power
aluminum chassis available for HQS9001.
D / PC3
Added PC3 power
cord and internal mains filter (no applicable to HQS1050)
New XL heatsinks
for HQS7001 and HQS6002 (no fan unit)
||Improved LDA amplification circuits,
MTP output stage and RPS power supply
||Improved LDA amplification circuits,
MTP output stage and RPS power supply
First models with new chassis,
MTP and RPS. Prototypes, upgrade recommanded
The HQS7001 is
added to the product line
Initial reference studio monitoring
amplifiers (new series, following HQS3200 and HQS2400)
JMF Audio products are designed to be references and to last.
The base of these instruments is safe and modular. Upgrades are proposed for
clients to take advantage of the results of our continuous research and
development efforts, without the need for product change. It means
"details", but details make the differences and can lead to the
exceptional. The device revision (B, C, D...) is indicated by a silver badge
located on the rear panel and is linked to the product serial number in JMF
Audio's tracking files.
> More information about our upgrade policy.