CM8 and CM4 modulation cables




Carrying the signal...  Caring for the music.

As it has been explained in the pages related to the history of the make, the type and the purity of the materials and their associations for sound neutrality has been the second point of research of Jean-Marie Fusilier. Indeed his main activities were in high frequency electronics, in which field engineers pay great attention to materials and shields for proper signal propagation and signal integrity. The CM4 is the result of years of development, formerly in cooperation with specialists in vinyl playback in Europe. The CM4 cable was then presented along with the HQS power amplifiers and was systematically chosen by the descerning studio professionals and music lovers in the USA, Europe and Asia. Excellent products stand the test of time.


The manufacturing of the CM4 cable draws upon exceptional tooling and materials. The conductors are made of extremely pure long crystals. The construction is totally symmetrical as always with JMF Audio's designs. The whole cable assembly requires very precise conductors and shield placement for optimal sound result. By design, the CM4 cable preserves signal integrity, is virtually  immune to microphonic effect (vibrations) and electromagnetic interferences that are both responsible for sound blurring. 


The CM4 cable is distinguished by a soft natural, faithful and homogeneous sound, timbres rightness and an exceptional coherent deep and wide three dimentional soundstage. Instruments of an orchestra are at the right place and sound natural. 


The CM4 cable has linked audio devices in different setups with excellent results. It also creates a matched link between JMF Audio elements (DXC2.2 converters, PRS1.5 preamplifier, HQS power amplifiers). The philosophy is preserved, especially with the latest cable version. 

We can manufacture single ended (RCA connectors) versions on demand, which starting from revision E, take full advantage of the symmetrical design of the cable.


The CM8 is based on the CM4 and features advanced mechanical damping and shieldings for superior immunity to noise, electromagnetic interferences and vibrations. As a result the CM8 has a greater diameter and a different finish. The manufacturing of the CM8 is a longer process. 


Since 2015, CM4 version D and CM8 version B, each individual cable has been identified with a serial number with the corresponding manufacturing and measurement notes stored in JMF Audio's files. Before delivery every cable has passed through a break-in period and listening tests in our studios for verification compared to our references. We are proud to deliver our latest models to you in the deluxe boxes they deserve. 



Key features :


 -  PLC pure long crystal, specific to JMF Audio

 -  XQD symmetrical design specific to JMF Audio 

 -  TSD specific JMF Audio shielding technique. Improved with EHF super shield starting from CM4-E and CM8-C.

 -  NAS neutral solder made to measure for JMF Audio (solder of conductors and shields to connectors)

 -  High quality metal XLR gold contacts connectors



CM8 -C


CM4 -E  with RCA terminals, featuring proprietary EHF-Shield link



Present models :

CM4 -E Dia.  8mm. EHF shield. XLR connectors or single ended RCA with EXF link (dia. 4mm banana)
CM8 -C Dia. 15mm. EHF shield. XLR connectors. 

length 1.5m. (custom possible)

Owners' comments:

The JMF Audio CM4 and CM8 cables have seduced music lovers from all areas. Whether these experienced audiophiles and sound engineers used to defend microphone or exotic interconnects, silver or copper based conductors, they have found in the JMF Audio cables 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 decided to 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. M.C. (HQS7001, PRS1.5)

"It is amazing that even the cables like the CM4-B bring along this typical JMF Audio sound character: sweet mids and definition"


Mr. M.R. (DXC2.2)

"The CM4 is impressive, anytime. But it is on the piano that it surprised me the most" 


Mr. O.G. (HQS7001, DXC2.2 MKII)

"The more JMF Audio elements I add (CM4, SR8), the closer I get to the natural sound I have always looked for"


Mr. A.M. (HQS9001, PRS1.5, DXC2.2, PCD302) 

CM4: "Coherence is the word that comes to my mind"

CM8-C: "Having experienced the evolution from CM4 to CM8-C, I must say it is very impressive."


Mr. M.A., world class studio owner in New York City, USA 

"These rigid black [CM4] modulation cables are incredible. They greatly respect the sound stage." (2007)


Revisions history:

CM8 -C Introduction of proprietary EHF shieldings. Allows a total continuity with the isolation concepts inherent in the JMF Audio electronic devices. Major upgrade. (2016). Present model.
CM8 Initial model. Upgrade to CM8-C is possible and suggested.


CM4 -E Inheritance from the CM8-C technology. Major upgrade. (2016). Single ended RCA version available, featuring external link for the EHF shield. (2018). Present model.
CM4 -D Upgrade to CM4-E is possible and suggested.
CM4 -C Upgrade to CM4-E is possible and suggested.
CM4 -B

Improved fabrication, which resulted in more detailed soundstage and sweeter mids response. Upgrade to CM4-E is possible and suggested. New stiff bright-black outter enveloppe.

CM4 Initial reference for vinyl playback and studio monitoring interconnect (1990)


When possible, 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. Starting from CM4-D and CM8-B, the cable revision (B, C, D...) is indicated by a silver badge next to the model name and is linked to the product serial number in JMF Audio's tracking files. 

> More information about our upgrade policy.

> Access the complete cable offering


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