DXC 2.2 MKII is ultra high performance, universal, future proof yet
clean and simple to use.
MCLK3 locking mechanism is JMF Audio’s smart answer to clocking
issues with transports.
USB module permits bit-perfect operation with isolation and local
> DA768 conversion rates of 705.6 and 768kHz
allows PCM audio to outperform DSD (SACD).
DMSS super symmetrical conversion on gold plated substrate, an analog piece of
> Via a standardized link,
MCLK3 extracts an incredibly detailed and natural sound.
The main digital audio board handles the standardized
audio S/PDIF and professional AES-EBU inputs and embeds the reference master
clocks. The USB module comes as an add-on. Because JMF Audio believes that digital electronics in
a DAC is a matter of analog
design (clocks are analog components by nature), a special attention
was paid on the development of this new main digital audio board incorporating many innovative features. The
two S/PDIF and two AES-EBU audio inputs are independent and
galvanically isolated. The clock and data recovery from the audio source is
performed by the newly designed proprietary MCLK3 vari-speed 3-stage-locking
mechanism that takes reference from the local master clocks through the
MCDC master clock distribution circuits.
The MCDC circuits feature two shielded bespoke master clocks. One is used as reference for input sampling rates multiple of 44.1kHz and the other is used for sampling rates multiple of 48 kHz.
the implementation of these concepts has resulted
a digital electronic circuit board which serves the music.
Unrivaled precision timing. High resolution is nothing without
precise time reference.
The MCLK3 principle
contributes to the fluidity, to the natural rendering, to the true dynamics and “analog” feel that surprises the
listener. The optimum is assured with a single S/PDIF or AES-EBU
connection, simply, up to 176.4 and 192kHz sampling rates.
Audio DMT 3.7 transport plays SACD and Blu-ray
Pure Audio discs (192kHz), PCM and DSD files and
connects to the DXC 2.2-MKII using an AES-EBU interface.
The DXC 2.2 MKII's USB module offers the highest quality way to take
advantage of files from your
The USB module allows the connection of an audio server, typically a personal computer on which an audio software player has been
installed. As explained in the previous paragraph, the USB module is an add-on to the main digital audio board. The USB module is extractible from the chassis, which makes the
DXC 2.2 MKII open to upgrades to follow possible future computer audio interface standards.
The USB module
features a galvanic isolation, preventing the DXC 2.2 MKII from being
subject to the electromagnetic interferences from the computer
environment. This module is enclosed in an aluminum shield case and
takes advantage of a dedicated power supply.
As opposed to the S/PDIF and AES-EBU interfaces that carry
audio information continuously, data over the USB interface are transferred
The USB module hence operates asynchronously with the computer, via a
bi-directional communication. The samples are requested from the
computer which provides them to the main digital audio board at the
pace imposed by the DAC's local master clocks.
DA768's conversion rates of 705.6 and 768kHz
allows PCM audio to outperform DSD (SACD).
The conversion section named DA768, another masterpiece and jewel
inside the DXC 2.2 MKII, converts bitstreams into physical magnitude. The DMSS conversion architecture followed by an ultra high precision analog section ensures unparalleled conversion linearity. The very low level information that represents the subtle nuances in the artists' play and the most subtle
ambiances are extracted and correlated to the musical content. This
results in an extraordinary homogeneous rendering.
The DA768 board features discrete ultra-low noise level surface-mounted
components and custom-made capacitors. All
the components and connectors of the audio path have been selected based on
technical and reliability criteria, as well as 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.
DMSS super symmetrical conversion on gold plated substrate, analog piece of art.
Featuring a deactivatable volume control, the DXC 2.2 MKII can directly control a power amplifier. In fact, the output stages inherit technologies
employed in the PRS 1.5 preamplifier. In the pure analog section, the new DA768 board
embeds a passive attenuator controlled by the HIGH / LOW switch
located on the rear panel. The output level range can be adjusted according to the sensitivity of the
driven device. When the DXC 2.2 MKII is used with variable volume, enabling
the output attenuation optimizes the conversion resolution and the dynamic range.
> The DXC 2.2 MKII was designed to be a timeless
After selection on technical aspects, refined selection on measurement, the final decision on absolutely all the audio components that the
DXC 2.2 MKII contains has been taken after long listening tests in the JMF Audio's studio.
From the remake (MKII) of the DAC series up to its current revision (see
bottom of page), JMF Audio’s investment in research and development
has been continuous.
Audio DAC, faithful to the music.
The JMF Audio elements are entirely hand crafted in our workshops and pass severe tests. Since revision
B, every DXC 2.2 MKII 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.
MQA by Bob Stuart:
We are pleased to
announce that the JMF Audio digital to analog converters are
compatible with the MQA's most important aspect by nature. Indeed, JMF
Audio has designed DACs converting as high as 768kHz for all
input rates in order to present a sharp "analog like"
impulse response, since 2003...
When playing an
MQA-CD or file, including an estimated
compensation of the blurring effect on the
recording side, the result would be unhindered by the DXC2.2
also includes a data size reduction feature for easier download
and storage, which is mostly interesting for portable audio
devices and streaming. When playing MQA files, unfolding should be done with
||2 (IN1, IN2)
||2 (IN3, IN4)
|| to  in variable volume (no display in
|Mode of operation
||variable volume / fixed full output (for use with
||[i0] to [i4]
|Source selection, shortcut
||quick toggling between USB and preferred
||IR remote control, all functions
|Ground connection (earth) optional
||dia. 4mm banana type
Massive aluminum volume control button hold by a double bearing in
a machined aluminum compartment for smooth rotation.
Machined 10mm thick anodized and brushed aluminum chassis, mounted on special damped and anti skidding JMF Audio feet.
digital audio board
inputs electrically independent /
inputs impedance, min. and max. level
ohms, 0.2V .. 5V
inputs impedance, min. and max. level
ohms, 0.2V .. 10Vpp differential
proprietary vari-speed 3-stage-locking mechanism with reference
to the local master clocks
DAC concept with 2 made-to-measure ultra low jitter master
clocks in MCDC
proprietary clock circuits
32, 44.1, 48, 88.2, 96, 176.4, 192 kHz
shielded module / galvanic isolation
|USB connection type
||USB 2.0 High Speed compliant
|USB Audio Class
||Audio Class 1 or 2 selected with switch at the back
||asynchronous, DAC master
specific ASIO driver provided for Windows
||16..24 bits / 44.1, 48, 88.2, 96, 176.4, 192 kHz
|Digital to analog conversion technology
||DA768 w/ DMSS topology
on proprietary PGP multilayer gold plated substrate
|True digital to analog conversion rate
||705.6 kHz or 768.0 kHz depending on input
|Total harmonic distortion plus noise at full output
||0.0008 % at 1kHz typical** (bw. 22Hz .. 22kHz)
|True audio dynamics (EIAJ
||130 dB typical** (real!
no auto-mute function!)
|True signal to noise ratio
(full output, XLR)
||130 dBA typical at 1kHz**
(real! no auto-mute!)
||50 ohms RCA and XLR
|Output level range control
||passive attenuators, remotely controlled
|Maximum output level
+20dBu (7Vp) XLR switch HIGH / 0dBu XLR sw. LOW
+14dBu (4Vp) RCA sw. HIGH / -5dBu RCA sw. LOW
||70 steps of 1dB, digital at the conversion
|Main power supply
|Mains voltage range
|Power supply isolation
||Two levels of
|Internal power supply
||< 25W in operation (< 1W in standby)
and SNR measurements with 4th order low pass filter at 22kHz for
accurate value. Measured
performances with Audio Precision Dual Domain equipment.
notice: Many modern DACs automatically activate an auto-mute
function during supposed silences... Measures of SNR and
dynamics may thus be impressive (incredible), but they do not reflect
Characteristics are subject to change with
product evolution, without notice.
|DXC 2.2 -MKII
||Product described here
|DXC 6.10 -MKII
||Modular: multichannel and/or DSP (PSL / PSL-X)
||See product page
The JMF Audio DXC2.2 MKII has seduced music lovers from all areas. Whether these
experienced audiophiles and sound engineers used to defend tube
based designs or whether they used to trust famed brands in solid-state
have found in the JMF Audio DAC 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.
Mr. Martin (HQS7001, PRS1.5,
"I plugged in the DXC2.2
MKII last Saturday and the listening is staggering. Same feeling as with the change of
preamplifier. The mid frequencies are realy worthy of JMF
Audio (French Musical Jewel) and the listening in general shows unequalled
presence, fullness and sweetness. [...] The Mahler's 10th symphony played with
[French made highly regarded CD transport] has reached
a never imagined level of dynamics, sound stage and analog feel..."
Yu (HQS6002, PRS1.5, DXC2.2 MKII) Singapore:
to let you know that I have received the unit [DXC2.2 MKII] yesterday and
just completed the connection about three hours ago. Listened to the first
piece of classical music and feel like I was transposed to the concert hall!
Thank you. [...] .
Chan (DXC 2.2 MKII), Hong Kong, 2015:
"I have to say thank you for your great and amazing DAC! Its performance is over my
expectation... It is very natural, open and with very good resolution! Thank you very much again for your great product !!"
Mr. W.Ng., first owner of the DMT3.7
with DXC2.2-MKII combo in
Hong-Kong (including DP5 AES-EBU cable):
"I must write to congratulate you guys for an amazing creation in the
transport [and DAC]. Totally amazing. I now use it all the time from my array of other
stunning." (e-mail feedback)
Mr. C. N., France, DXC 2.2 MKII-D converter
(associated with DMT 3.7 transport and DP5-B AES-EBU link):
"I am eagerly listening to the source
that I have purchased from JMF Audio. [...]
All this gives a lot of realism, but with naturalness, without effects of hardness or excess of precision. I have no doubt that this is the player, but also its association with the
DAC (DXC 2.2 MKII-D) and DP5-B cable that are non-destructive of all these signals provided by the transport.
The sound engineers will have to deliver the best and our ears to stay
young..." (via e-mail, 1 month after reception of
Mr. M. Ma. Hong Kong, already
owner of a JMF Audio DMT 3.7 transport, purchased the DXC 2.2 MKII -D (2018)
"[The DXC 2.2 MKII-D] sounds incredible, so dense, so natural, so musical..."
Mr. Marvel, Marvel Music, Hong
Kong, DXC2.2 MKII-D associated with DMT 3.7 transport, 2018:
"The JMF Audio's
source outperfoms our previous reference SACD player by a
Revisions history on model MKII:
|DXC 2.2 MKII -D
||Major upgrade, 2017. Inheritance from the revision D of
the PRS1.5 preamplifier.
Read the first impressions in New York studios
|DXC 2.2 MKII -C
||Major upgrade. Finalization and homogenization of the
global isolation and shielding concept initiated in 1985. Applies to
all JMF Audio products.
|DXC 2.2 MKII -B
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.
MKII means a
complete new design (chassis, shematics, components, circuit boards, power supplies, features).
|DXC 2.2 -C
||Improved power supplies and groundings
|DXC 2.2 -B
||Improved power supplies
||Initial release (2006)