Re: Opamp distortion survey



"Michael A. Terrell" wrote:

Eeyore wrote:
krw wrote:
rabbitsfriendsandrelations@xxxxxxxxxxx says...

In reality, 600 ohms is dead. The cable is 100-110 ohms anyway, it was only ever
telegraph lines that were 600 ohms.

Dumb donkey.

So what characteristic impedance are they then Mr Expert ? Do you know how to calculate
it and why was AES3 defined for use with 110 ohm cable ?

Almost no pro audio gear today has to drive 600 ohms, although the ability to do so
is often preserved. 5-10K ohms is a more likely load Z.

Wired intercom (Telex, ClearCom, RTS, and such) uses 200 or 300 ohms
(600 double terminated). I'm sure glad I don't have to drive 8V
into 2X-double terminated 100-110 ohms.

Intercoms are NOT pro-audio.

That depends on the application. All audio in a TV studio is pro
audio.

You could care to define it that way but it's obfuscation. It's quite clear intercoms are not
the subject of this paper.

Graham

.

Relevant Pages

  • Re: Opamp distortion survey
    ... In reality, 600 ohms is dead. ... Intercoms are NOT pro-audio. ... All audio in a TV studio is pro ... The first sign of insanity is denying that you're crazy. ...
    (sci.electronics.design)
  • Re: History Lesson: 600 ohm balanced line
    ... But since telephony audio was never transmitted over ladder line, ... inches is about 600 Ohms. ...
    (rec.audio.pro)
  • Re: Left speaker wont work.
    ... Have tried 2 different sound cards. ... Have tried 3 different sets of speakers. ... audio device, that claimed a low value of 1 ohm. ... be equal to or even higher than 8 ohms. ...
    (microsoft.public.windowsxp.hardware)
  • Re: How to electronically put a telephone line "off-hook"
    ... To seize the telephone line you need ~200 Ohms across the conductors. ... The 600 Ohm transformers are to sort of near match the AUDIO impedance ... Ohm audio output transformer winding in SERIES with ONE of the telco ...
    (sci.electronics.basics)
  • Re: The decibel
    ... The characteristic impedance of the twisted pair cable is actually around ... ohms and DSL circuits operate at this impedance. ... higher than that of cables, as you say, that is far from the entire ... this discussion concerns the characteristic impedance at audio ...
    (rec.audio.tubes)