1- Math:A 100dB/W/m sensitive speaker needs 1000W of power to create 130dB SPL at 1m distance, which is the level a symphonic orchestra produces at the conductor's position... This was used to be mandatory for monitoring in world-class recording studios in the early 80's already. A high-fidelity system is expected to reproduce real life music.2- Linearity:Making high sensitivity drivers/speakers is not basically our goal. In our case it is because the design is good that the sensitivity becomes high. It is a natural result. Then, the slightest power provided by the power amplifier to the driver makes the driver move and produce sound. This is the definition of high sensitivity."Low sensitivity" for a driver means a significant part of the power delivered by the power amplifiers is transformed in heat, not in sound... The power that is lost means details of music that is lost...Not only most low sensitivity drivers fail to reproduce small signals, but they also tend to become non linear with large magnitude signals. Their "linear" dynamic range is therefore limited.3- Accuracy, comfort, serenity:JMF Audio power amplifiers are powerful. Moreover they are high-voltage (like tube amps) and high current output. In our opinion, people have always underestimated the counter-current (counter-force) returned from the speakers/drivers.Most power amplifiers are measured on resistive loads, which is purely static. A speaker is by nature absolutely dynamic, just the opposite... A power amplifiers has to deal with huge counter currents and needs to be strong, powerful to remain stable and provide accurate control. Failure to handle electromotive force leads to intermodulation distorsion, ambiance loss, colorations, etc.The power amplifiers are supposed to drive the speakers. And we do it the nicest way with the most refined design which allows timbal accuracy, natural ambiances, three dimensional rendering, etc. Long story...The JMF Audio philosophy leads to comfort in music playback: Super high signal to noise ratio and ultra high linearity for the slightest details to be reproduced and made perceptible and for the highest fortissimos to be played seemlessly, easily, naturally.
I would first like to say that I really enjoy reading all
the input from PT and all the audiophile sifus here. It’s both heartfelt and technical, which fulfills the needs
for most audiophiles.
I concur fully with one of the sifus that the systems that we
have are a “time machine or portal” which allows us to transcend to the era of
the recording and to allow such emotional transfer being portrayed by the
My limited experience will prevail but I would like to share
my amateur experience after living with the JMF PCD302 for just under a
If a turntable is a source, what is the JMF PCD302 I asked
myself. It may be a
source of conditioned electricity or an ancillary to the system. Any which way the nomenclature goes,
its suppose to improve the system output.
The JMF PCD302 is nothing less than this. And it does it with suchg style and
finesse that I have not heard in other conditioners. Its isolated all the plugs to one component and utilises a
dual mono concept via 2 PC3 cords.
The rear panel also alerts us of potential phase reversal.
My unit arrived last Monday. Like a child during the festive seasons, I gained the energy
to carry the 25kg parcel across the lawn and up 2 flights of stairs to my
listening room. I listened to my
selection of music for the last time before hooking everything up to the JMF
Sinatra at the Sands (reprise, 1966 white label promo) – fly
me to the moon
Nils Lofgren – Acoustic Live– (AP reissue) – Keith don’t go
Dave Brubeck – (King Records, 1965 white label promo) – Take
Kenny G – (Arista, 1989)
Michael Jackson Thriller – (Epic, 1983 – white label promo)
– Lady of my life
Dead Can Dance – Into the labyrinth (1993) – Yulunga
Metallica – Black album (1991 Elektra (reissue) and Vertigo)
– Sad but true
Gounod/Bizet – Faust/Carmen (RCA Victor) – Carmen
Ella and Louis – (Mono, white label promo) – Lets be friends
Ernest Ansermet – the Royal Ballet Gala Performances (RCA
My immediate first impression once the stylus dropped was
how loud the silence was. My room
became bigger and I was enveloped into the ambience. I was sucked into a vacuum of silence till the first note
was struck. Then i knew I was in for something special..
The 60’s mic on Sinatra’s voice with Basie on the piano was
so harmonious. The big band
playing in tandem and the ruffling of the audience was brought to life as my
room transcended to the Copa Room at the Sands Hotel. In Niles Lofgren’s Keith Don’t Go tract, the solo attack on
the guitar was fast, bold and you could hear the plectrum striking the metal
strings. The goose bump factor was
Trying to squeeze every last juice out of the system, I
grounded the chassis of the JMF PCD302.
I wasn’t sure what this would do but it was just a matter of unscrewing
one of the hex screws and fastening the spade to the grounding device. This improved
the dynamics and preciseness of the music even more. Maybe JMF can consider putting a grounding post on the units
for the future.
The JMF PCD302 maximises the potential of the equipment
connected to it. It refines
the music to another level without loosing its original character intended by the respective components. My hats off to JMF Audio.
A definite must even when we have enough wall plugs. Thanks PT for your patience, knowledge and
dedication and to all Sifu’s here.
My journey continues…
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