Go Back   Home > Forums > >

Construction Tips Construction techniques and tips

Equal length wiring
Equal length wiring
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools
Old Yesterday, 11:30 PM   #31
tommus is offline tommus  United States
diyAudio Member
 
Join Date: Jul 2009
I just read an article about a situation where the wire length was important. It was the Trinity atomic bomb prototype. These wires were there to trigger the multiple explosive lenses that would create a perfectly spherical implosion.

Click the image to open in full size.

Cable management is sub-par.
  Reply With Quote
Old Today, 05:16 AM   #33
PRR is offline PRR  United States
diyAudio Member
 
PRR's Avatar
 
Join Date: Jun 2003
Location: Maine USA
Equal length wiring
If L/R length matters, we have to sit ON the center between our speakers to sub-micron accuracy, because speed of sound in air is so much slower than speed of audio in wires.
  Reply With Quote
Old Today, 08:06 AM   #34
Jazz Man is offline Jazz Man
diyAudio Member
 
Join Date: Jul 2021
Exactly, and time delay is not the issue hpro imagines it to be. Phase shift is possibly an issue.
  Reply With Quote
Old Today, 08:51 AM   #35
hpro is online now hpro  Switzerland
diyAudio Member
 
Join Date: Apr 2012
Location: Bern, Switzerland
That's only my opinion. everyone free to have it's own opinion in this matter..

When we sat in the nineties in Hifi House in Bangkok, there were guys who could hear out what kind of CAPS were used in AMPLIFIER. What Kind of Cables between the devices. I was there and have seen it..

I do agree that for 1 or 2 inches it (may) don't matter.. and I can not tell you if this matters, in the circuit, but for me I try to design my Artwork, so I do not need to find errors when it don't sound the same because of different sizes and lenght of connection tracks, or cable connections. I have had that recently on speaker cables, Measuring distortion while testing an amplifier Ciruit. and just because that pair of speaker had not exactly 8 Ohms.. then Exchanging Cable to a shorter one removed the problem.

In the early Nineties, I was in love with a beatifull Thai Lady and her father had an Electronics shop in Chiang Mai, Thailand. I went to help him to build his Amplifiers he build and sold there..

Mosfet 2SK176 with 2SJ56 *If I remember rigth* it was a copy of Hafler DH-220..
And we had always problems when connecting Speaker cables with more lenght than 5 Meters. I know that cause has nothing todo with this here or only little. But again shorter Cable did not Oscillate. Ripping the cables apart did not solve the problem, but shortening the cables down to 1.5 meter and all Oscillation was gone.
So please forgive me, I stand up that length matters.

thanks you for understanding.
Let me ask one more question:where is the problem to desing something evenly, that whatsoever no chances are taken that because of not distribuiting Current Voltage, energy evenly, will bring up problems. Even if don't matter as you guys write, OK with me, but I do not like to TAKE CHANCES and then to find out, why afterwards instead of listening and enjoy music which is played, sound is like a trash can.!..

Any one can look a this as he likes.. I do not try to convince anyone to change his mind, but I have seen to many examples where cables and wire were the culprit.!
thanks

Last edited by hpro; Today at 08:54 AM.
  Reply With Quote
Old Today, 11:18 AM   #36
Tubelab_com is online now Tubelab_com  United States
diyAudio Member
 
Tubelab_com's Avatar
 
Join Date: Jul 2005
Location: West Virginia panhandle
Quote:
Originally Posted by hpro View Post
Sound is moving in one second only 300Meter as far I remember, "speed of sound in dry air at 20 C = 343 m / s"

Speed of electricity In copper at 60 Hz, 3.2 m/s. this is what wikipedia tells me..it goes faster with rising frequency At least that's what I have seen also many time..
So, according to this sound of multiple frequencies travels at roughly a constant speed in air which is roughly 100 times faster than the same electrified sound travelling through the wires to the speakers, and that electrified sound will have a different speed of travel dependent on it's frequency with the treble arriving before the bass.

How then did I ever get outdoor speaker setups for live musicians to work where the speaker cables were over 10 meters long? Ever try to play a guitar when your monitors are delayed by even a few mS due to digital latency in a DAW or other signal processing equipment?

Live music would be impossible if the monitors were delayed by hundreds of mS, so every musician would have to use exactly the same cable at exactly the same length. Some instrument cables are rather long, and some instruments use no cable at all (wireless transmitter). The cables from the amps to the speakers are not all the same. How is it that all the sound is in sync?

Try this simple test. I have a test setup in my lab currently for working on reasonably powerful amplifiers. There is 50 feet (15.24m) of speaker wire connected between each output and the portable test speakers. This is so I can place the speakers in a closet to test at high volume levels without blowing my ears or upsetting the neighbors. I can plug headphones with a 1m cable into the same amp and run them concurrently.

Even with over 15m of cable the sound from both sources appears to be in sync.

There are plenty of ways to verify that WickedPedia is wrong in this case. I have shown a few, and I refuse to take this bait any longer. It just tastes bad.

Try some of these experiments for yourself or just think it through. Most of the tech we use today would not be possible if "electricity" in a wire only moved at m/S speed.
__________________
Tubelab, I blow stuff up so that you don't have to.
  Reply to this post

Reply


Equal length wiringHide this!Advertise here!
Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Volume Box equal vas and Fs equal fb Researchrob Construction Tips 1 3rd January 2021 01:32 AM
1/4 wave length vs 1/2 wave length? Oscillate Full Range 3 8th December 2013 03:56 AM
Slotted port length and aero port length. deebeez92 Subwoofers 3 26th March 2013 04:18 AM
Measure T/S.. Insanity check not equal to Fs HELP gjeff80 Multi-Way 7 3rd February 2004 05:15 PM
BR100 Feedback Resistor / Rf1 and Rf2 not equal? Hybrid fourdoor Chip Amps 1 19th September 2003 09:37 AM


New To Site? Need Help?

All times are GMT. The time now is 11:22 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Copyright ©1999-2021 diyAudio
Wiki