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Van Den Hul TIPS & HINTS


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Van den Hul cable length markers:
Measuring cable lengths is easy since all our cables are marked with a brand and type name printing every 25 cm. (10 inches).

Cable life and bending:
Try to avoid sharp bends in - or often bending of - any of our metal cables. Heavy and frequent bending induces a change in the conductors crystalline structure by displacement and fracture of their metal crystals. This gives rise to increased Cross Crystal Distortion (CCD), causing your audio system to gradually loose its natural clarity and start to sound harsh.
Although in our HYBRID cables the metal conductors are embedded in a Linear Structured Carbon ® layer which is able to bridge crystal defects, it is of course still advisable to handle your cables with care.

If you mount connectors to our cables yourself:

  1. To prevent mechanical damage to the conductors, whenever possible strip your cables with a thermal stripper, for example your soldering device.

  2. The optimal soldering temperature is around 260 degrees Centigrade (around 500 degrees Fahrenheit). A lower temperature will make a cold (brittle) joint, while higher temperatures will give you oxidized solder. Soldering should be a matter of seconds, not minutes.

  3. After you have made the soldered joint, wait 5 seconds longer than normal and don’t move anything. This will make sure that your joints are made well and will last longer.

  4. When available, use silver-saturated solder (commercially available Tin/Lead/Silver (Sn/Pb/Ag) types with a 2 to 5.8 % silver content). Or, if you can afford it, replace the tip of your soldering device with a silver tip; This way it is guaranteed that your solder is always 100% silver saturated.

  5. Solder at the right temperature and don’t apply heat too long else the cable conductors’ insulation will melt. This increases the risk of a short circuit occurring anytime during the cable’s life.

    Please note:
    Our HYBRID type interconnects use Linear Structured Carbon ® inside the cable which, when incorrectly assembled, can cause an (intermittent) low ohmic short circuit inside the connectors. This can give rise to all sorts of noise, loss of sound, distortion or coloration. When mounting connectors to our HYBRID type interconnects therefore make sure that:
    1. The black Linear Structured Carbon ® layer covering all internal conductors is removed so that it can not cause any low ohmic short circuit.
    2. The cable shield contains black conductive helically wound tape, which when not removed at the ends may also cause a low ohmic short circuit inside the connectors.

    When having mounted a connector always verify with an ohm meter that the resistance between any contact combination on the connector measures “infinite” (open circuit). Slightly twist/bend the cable near the connectors when performing this tests to also verify that no movement can induce a short circuit.


  6. Close the cable ends as much as you can to avoid air penetration. In the industrial world all air is polluted with corrosive gases. Due to each day’s temperature variations the contaminated air tends to flow in and out of your cables where in the long term it can do harm to your audio quality.
    We use the best jacket and insulation materials available, and the silver coating on our cable’s strands makes an excellent protective shield. But prevention is always better than replacement.

RCA connector terminated multicore cables: shield grounding:
All our screened twin core, quadruple core and triaxial (i.e. balanced) interconnects that are ready-made with RCA type connectors for unbalanced/asymmetric signal transport have their shield connected to the RCA connector’s shell (=ground) at ONE side of the cable only.
In connecting the shield to ground only at one side of the cable and lifting it at the other side it functions as a true screen: It does not carry any audio signal; It screens the inner conductors and drains away unwanted noise to one location.
The location at which the cable shield is connected to the RCA connector’s shell (=ground) generally is chosen to be at the signal source, however in few cases better shielding performance can be obtained by reversing the cable, thus grounding the shield at the signal receiving side.
When reading the “Van den Hul” printing on our ready-made RCA connector terminated multicore cable types from left to right, the grounded side of the shield is at the left hand side connector. Additionally, (as from May ’99) we have marked the grounded side of the shield with a special sticker. This side of the cable needs to be connected to the signal source.
If you wish to mount RCA type connectors to one of our multicore interconnects yourself we advise you to use the same system; I.e. connect the shield to the RCA connector’s shell (=ground) only at the “Van” side of the cable’s “Van den Hul” printing and leave the shield disconnected at the “Hul” side.

Connectors: Clean metal contacts with our RCA type connectors:
All our male RCA type connectors have a cut in the centre pin and multiple cuts in their ground contact shell. Rotating them in the female connector every once in a while and when you plug them in cleans the contacts and will collect the removed dirt in the connector’s slots. From now on you can always work with clean metal contacts.

Connectors: Contact treatment and protection fluid:
Use a protection fluid like our The SOLUTION to coat your audio, digital audio and video connectors’ contacts. Since this fluid allows no chemical actions to take place it prevents your contacts from oxidizing or getting dirty. Furthermore, by lubricating the contact surfaces subtraction and insertion wear on the connector’s precious metals is reduced. Both properties help to maintain high quality signal transfer for a long period of time.

Interconnect versus loudspeaker cable length:
If you are using high quality cables in your system, longer interconnects and shorter loudspeaker cables produce the best sound quality. If you’re using lesser quality cables it’s the other way round, short interconnects and longer speaker cables being the best combination. This because the greatest signal (quality) loss is at the lowest levels, rather than at speaker level.


Loudspeaker cable general advice:

  • It is advised to have your left and right channel’s loudspeaker cables of equal length; This way the cable’s impedance is the same for both channels.
  • It is better to run your loudspeaker cables as straight as possible from amp to speaker; Avoid loops and meander excessive lengths.
  • Whenever possible keep your loudspeaker cables (but also your interconnects!) separated by some distance (at least 10 cm. (4")) from your mains cabling. Also avoid running your audio wiring in parallel with your mains cabling.


Loudspeaker biwiring and biamping cable advise:
Biwiring is advisable. Because the production quality of our twin-lead loudspeaker cables is very consistent, we advise you to combine for example The MAGNUM HYBRID with the D - 352 HYBRID or the CS - 122 HYBRID.
The D - 352 HYBRID can be combined very well with the CS - 122 HYBRID, The ROYAL JADE HYBRID or The CLEARWATER.
In our product range we however also have special quadruple lead biwiring loudspeaker cables available.
When biamping our above mentioned cable types of course are also equally applicable.
When biwiring always make a good electrical connection between the two cables at the power amp end and if possible solder them together.
When biwiring or biamping keep the two different twin-leads separated by some distance to minimize their mutual electric interaction.

Loudspeaker cable connections:
The contact resistance (and its linearity) occurring at your loudspeaker and amplifier’s terminals is an often overlooked point. The contact resistance of bad connections can easily exceed the loudspeaker cable’s low resistance and hamper your damping factor. (Mind you: there are four contact crossings in each loudspeaker channel’s electrical current path). The use of good connectors and being able to firmly clamp them is important.

  • We strongly disadvise against simply connecting the bare (twisted) loudspeaker cable ends directly to your loudspeaker and amplifier’s terminals. Not all the loudspeaker cable’s strands will make a good contact this way. They also may fray and cause a short circuit and they even may corrode; Such connections are prone to introduce distortion.
  • If you don’t want to use proper connectors, at least make sure that the cable ends are decently twisted and saturated with solder (preferably silver-saturated solder, see “If you mount connectors.. (4)” above ); This guarantees that all strands make a good electrical contact. Furthermore the cable end is now rigid and thus can be firmly clamped.
  • If you prefer screw or nut type connectors, remember that there is still air in between the two contact surfaces. If you want to have absolutely the best connection, solder these metal to metal contacts to seal the joint. Solder well and use silver-saturated solder (see “If you mount connectors.. (4)” above).
    (Note: You may have to use a heavy soldering iron here. Before soldering remove any plastic connector parts that can otherwise melt!)

Cable length regarding change of connectors and/or frequent use:
Never make your cables too short. When e.g. after intensive use you want to change your connectors, it is easier to start with a fresh cable end by removing a short length. It is also better; as during their use cables are most often bent close to their connectors, the cable’s internal strands may have been exposed to stress there. Removing some length will make more sure that you start at a point where the internal strands haven’t been exposed to stress before and are less prone to break.

Cable life and temperature:
For a longer lifespan, avoid running your cables near to places where high temperatures can arise, like power amplifier heatsinks or tube equipment.

Cable life and floor placement:
Don’t stand on or walk over your cables. Especially interconnect cables with thin internal strands can be damaged. The cable’s electrical capacitance locally can change too. In digital audio interconnects this can worsen jitter performance by introducing signal reflections.

Cable life regarding environment and handling:
Bear in mind that the purest copper is only classified as OFC (Oxygen Free Copper) directly after it has been produced and that it won’t retain the same quality after time, especially if the wires are unprotected. As a result, the initial quality of signal transfer does not stay forever, but rather is influenced by all kinds of environmental and handling factors.
At our side we have taken all possible design measures to protect our cables’ conductors as good as possible. This together with your handling your cables with care will ensure their long and pleasurable performance in high quality listening.




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mercoledì 02 luglio 2014

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