4. Line Level Audio Leads

This is a term used to denote the standard strength of an audio signal transmitting analogue sound information between components such as CD and DVD players, hi-fi amplifiers, synths, effects processors, mixing desk line-inputs etc. 'Line level' is defined as follows:

Domestic/Consumer: -10dBV which equals a nominal voltage of 0.3162V RMS
Professional: +4dBu which equals a nominal voltage of 1.2280V RMS

This difference need not concern us when choosing audio leads as the requirements are exactly the same in each case (although connector types are usually different - see below). Be aware however, that feeding signals from consumer to pro gear may yield weak and possibly insufficient signal levels at the receiving end.

The currents involved are normally very small, as in audio equipment, for minimum distortion and best frequency response, you generally expect a low output impedance for the sender and a high one for the receiver. A 'rule of 10' is often applied in audio electronics, whereby for optimal fidelity, the input impedance of the receiving device is ten times the output impedance of the transmitting device.

Cabling is not super-critical for line levels, and you will often find that consumer gear comes supplied with suitable leads to get you up and running (usually a lapped screen). These are not likely to be of particularly great quality though, so you might want to consider an upgrade. Three different types of connector are commonly used to terminate cables carrying line level audio:

¼ Inch Jack Plug (or Phone Plug)

The jack plug is sometimes called a 'phone' connector because it was used for many years by telephone operators to patch phone lines together. These 1/4-inch plugs have either a tip and sleeve, or a tip, ring and sleeve (TRS). A TRS connection is either used for balanced audio lines (see the section on mic leads), or for unbalanced stereo sound, or for insert points (where a single socket provides both an input and output from a piece of equipment, e.g. to insert a compressor into the signal path). The mono variety (tip and sleeve only) is very common on musical instruments and other devices such as effects pedals, mixing consoles, active speakers, and amplifiers. They also come in 3.5mm and 2.5mm diameters, although these smaller sizes are only commonly used for headphone sockets, or for audio transfer where panel space is limited.

RCA or Phono Plugs

RCA or Phono - it's the same thing. RCA sockets are found universally on hi-fi and home entertainment systems, as well as on a huge range of studio equipment. You're more likely to find RCA connectors on devices which can be left wired in permanently, whereas jacks are a better choice for live gear where frequent connection and disconnection is likely. The RCA plug and socket mate very securely with good electrical contact. Jacks on the other hand sometimes need to be cleaned or at least wiggled in the socket to fix a noisy or intermittent connection.

XLR Connectors

Whilst these are usually associated with mic cables, they are of course also found carrying balanced line level signals (+4dBu) between professional audio devices. Unlike jack and the RCA plugs, XLR plugs come in two sexes male and female. These will interface with corresponding male and female sockets on the device. In this sense we can think of XLR cables as polarised. This ensures that input to input and output to output connections are unlikely if not impossible - foolproof! (For those in doubt, the male connector is the one with parts sticking out, the female has the holes.)

O seu contacto

Os melhores produtos relacionados

  1. Cordial CTM 5 FM-GN

    Cor­dial CTM 5 FM-GN

    Em stock
    € 16,50
  2. Sommer Cable Galileo 238 2,5

    Sommer Cable Galileo 238 2,5

    Em stock
    € 28
    € 35,13
  3. Sommer Cable Galileo 238 10,0

    Sommer Cable Galileo 238 10,0

    Em stock
    € 39
    € 49,58
  4. Cordial CTM 3 FM BL

    Cor­dial CTM 3 FM BL

    Em stock
    € 14,60
  5. Cordial CTM 5 FM-RD

    Cor­dial CTM 5 FM-RD

    Em stock
    € 16,50
  6. Sommer Cable Galileo 238 5,0

    Sommer Cable Galileo 238 5,0

    Em stock
    € 33
    € 41,46
  7. Sommer Cable Stage Blue Line Vocal 1,5m

    Sommer Cable Stage Blue Line Vocal 1,5m

    Em stock aproximadamente em uma semana
    € 9,90
    € 11,90
  8. Cordial CPM 10 FM-Flex

    Cor­dial CPM 10 FM-Flex

    Em stock
    € 27
  9. Cordial CTM 3 FM-GN

    Cor­dial CTM 3 FM-GN

    Em stock
    € 14,60
  10. Cordial CSM 5 FM-Gold

    Cor­dial CSM 5 FM-Gold

    Em stock
    € 24,80
  11. Cordial CTM 5 FM-BL

    Cor­dial CTM 5 FM-BL

    Em stock
    € 16,50
  12. Cordial CTM 3 FM-RD

    Cor­dial CTM 3 FM-RD

    Em stock
    € 14,60
  13. Cordial CPM 15 FM

    Cor­dial CPM 15 FM

    Em stock
    € 28
  14. Cordial CFM 2.5 FM

    Cor­dial CFM 2.5 FM

    Em stock
    € 11,80
  15. Cordial CTM 10 FM-GN

    Cor­dial CTM 10 FM-GN

    Em stock
    € 20,90

Marcas populares

  • Monster Cable
  • Mutec
  • Tiptop Audio
  • Harley Benton
  • Alva
  • Eurolite
  • Doepfer
  • Ernie Ball
  • ADJ
  • Rockboard
  • Hosa
  • AKG

Os produtos mais populares

  1. the sssnake IPP1030

    the sss­nake IPP1030

    Em stock
    € 2,50
  2. the sssnake SM10 BK

    the sss­nake SM10 BK

    Em stock
    € 6,60
  3. Neutrik XXR Red

    Neu­trik XXR Red

    Em stock
    € 0,25
  4. Neutrik XXR Blue

    Neu­trik XXR Blue

    Em stock
    € 0,25
  5. the t.bone Headphone Adapter

    the t.bone Headphone Adapter

    Em stock
    € 2,90
  6. Neutrik NC3FXX

    Neu­trik NC3FXX

    Em stock
    € 3,19
  7. Monster Cable Classic Instrument 21AC WH WW

    Monster Cable Classic Ins­tru­ment 21AC WH WW

    Em stock
    € 24,90
    € 49
  8. the sssnake SM6BK

    the sss­nake SM6BK

    Em stock
    € 4,99
  9. Neutrik NC3 MXX

    Neu­trik NC3 MXX

    Em stock
    € 2,80
  10. Millenium AV110 Cable Drum

    Mil­le­nium AV110 Cable Drum

    Em stock
    € 14,90
  11. pro snake Patch Angled Jack 0,15 m

    pro snake Patch Angled Jack 0,15 m

    Em stock
    € 2,50
  12. Neutrik XXR Orange

    Neu­trik XXR Orange

    Em stock
    € 0,25
  13. Millenium AV230 Cable Drum

    Mil­le­nium AV230 Cable Drum

    Em stock
    € 29
  14. Millenium AV310 Cable Drum

    Mil­le­nium AV310 Cable Drum

    Em stock
    € 129
  15. the sssnake IPP1060

    the sss­nake IPP1060

    Em stock
    € 3,55