Delay lines for speakers a question

[tonymaslen]

Scenario......

 

Two speakers ten meters apart, with delay on the furthest away from the stage.... fine so far.....

 

Question;

 

"If these two speakers were connected with a 30m cable will this affect the delay required?" or does it solely go on the physical distance between the cones.

[J Pearce]

The signal does not have to travel down the cable as such.

The electrons entering at one end push all the electrons along and push some out of the end of the cable. Rather like putting more water in the end of a full water pipe.

 

As such any delay introduced by cabling is tiny.

[mackerr]

The signal does not have to travel down the cable as such.

The electrons entering at one end push all the electrons along and push some out of the end of the cable. Rather like putting more water in the end of a full water pipe.

 

As such any delay introduced by cabling is tiny.

Not to be pedantic, but the signal does travel down the wire, it's the electrons that don't. Depending on the conditions, electrical signals travel through wire at something on the order of .6C, so the delay induced will be much smaller than tiny. :D

 

Mac

[J Pearce]

Yes, sorry, my terminology was slightly out. Has been a long day.

 

And indeed, the delay is far smaller than tiny, my vocabulary seems to imagination as the evening goes on....

[Seano]

BSc(Hons) Media Technology

More 'media' than 'technology' then was it? :D

[andylouder]

If one speaker is flush with the stage and the other is 30 metres in front of that ,I would have thought it better to run it off a separate amp with a delay.

[paulears]

if you didn't run it from a separate amp and delay - er, where would the delay come from then?

 

 

Nobody has actually said it yet - but you are talking about two different concepts - the electrical connection - as in nearly the speed of light - 300 million metres/sec - but sound travels a bit slower as in just over 300 metres/sec. So the delay effect of your short (on these scales) bit of cable is measurable but totally insignificant. Is that the answer you wanted?

[Seano]

So the delay effect of your short (on these scales) bit of cable is measurable but totally insignificant. Is that the answer you wanted?

<goes away and taps on calculator>

What you'd describe as a "long" cable, in this context, would be measured in 100's of kilometers.

[MarkPAman]

What you'd describe as a "long" cable, in this context, would be measured in 100's of kilometers.

 

Indeed, have you ever made a phone call accross the atlantic using the transatlantic cable? No delay woth speaking of.

[Bobbsy]

At 30 metres CABLE length, there will be a delay, but it will be far below the point where it can be noticed (and far below the minimum adjustment of any delay unit). Doing a "back of the envelope" calculation, delay in a cable would be in the order of 1ms per 180 kilometers, based on the signal travelling through the cable at about .6 the speed of light.

 

Put in perspective, the 10 metre physical spacing difference will give you a delay of roughly 30ms., again "back of the envelope" accuracy" before anybody complains.

 

Bob

[dan slv-tech]

Indeed, have you ever made a phone call accross the atlantic using the transatlantic cable? No delay woth speaking of.

I think your find theres a huge delay from when you speak in the handet, its encoded, transmitted, recieved, decoded- try ringin your mobile from your home phones whilst stood next to it- about a second I think your find, between when you talk and when you hear yourself on the other phone-Althought this is all compensated for when your having a convo at the exchanges, though I have had convos from uk to amercica and there has been a delay from when I talk and they reply and I can hear myself coming back on my phone- thats if that was what you were saying, if not , appologies

 

dan

[bruce]

I think the point he's making is that the delay on a transatlantic phone call is negligible if it uses a cable circuit compared to using a satellite link, where the delay is roughly 0.3s in each direction.

 

but we're going well :D now...

[Bobbsy]

Indeed we're drifting off topic and, as this is a matter of physics not opinion, I'm not entirely sure that a poll is the appropriate way to resolve the question.

 

Since the correct answer has been explained in several different posts, I'll close this one now.

 

Bobbsy