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levyte357-
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Posted: 13 March 2018 at 4:40pm |
imageoven wrote:
levyte357- wrote:
I also think simple 2In/6out Output LMS, would be a professional solution.
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But totaly overkill compared to a couple of meters of signal cable linking the pheonix connectors.
A LMS would cost £200 +, would require 1U rack space and then another 8 x xlr connectors.
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Used Behringer DCX costs less than £200. No impedance worries, led display of signal fed to each amp, and limiter per amp, all configurable by PC. " Sometimes simplicity is the shelter often retreated to, by the less able".
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Global Depopulation - Alive and Killing.
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fatfreddiescat
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Posted: 13 March 2018 at 5:15pm |
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mini-mad
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Posted: 13 March 2018 at 6:41pm |
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If it sounds like a gorilla is trying to escape, turn it down.
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Elliot Thompson
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Posted: 13 March 2018 at 6:55pm |
If you have one at home, the most logical thing to do is to hook it up and listen if you achieve a degradation in the sound or not as you connect your 3rd, 4th and, 5th amplifier in the chain. I am a strong believer of using what you have at your disposal in your collection of equipment doing nothing at the moment before, buying another piece of equipment. This is why suggested using an LMS as an alternative if by chance, you had one lying about doing nothing instead of buying a distribution amplifier. Best Regards,
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Elliot Thompson
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serioussound
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Posted: 13 March 2018 at 7:09pm |
I thought this was a simple newbie question :)
But it seems little complex.
In professional bigger installations how do the pros doing it?
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Elliot Thompson
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Posted: 13 March 2018 at 7:24pm |
serioussound wrote:
I thought this was a simple newbie question :)
But it seems little complex.
In professional bigger installations how do the pros doing it? |
A Distribution Amplifier. There are very few here that requires 5 - 20 amplifiers receiving the same audio signal. Those who need to accomplish such a task, use a distribution amplifier. Click On This Link To Get A Better Understanding Why Many Use Distribution Amplifiers Best Regards,
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Elliot Thompson
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APW
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Posted: 13 March 2018 at 7:42pm |
If the amplifiers had an input impedance of 600ohm.... then yes, you need a distribution amp... however, the amplifier input impedance is high at 20K. https://www.soundonsound.com/techniques/understanding-impedanceRead the section on "Voltage Matching & Bridging Inputs", the example talks about tape machines, however it's exactly the same for amplifiers, as the mixer cannot tell the difference, it just sees impedance.
Edited by APW - 13 March 2018 at 7:47pm
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Elliot Thompson
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Posted: 13 March 2018 at 8:04pm |
APW wrote:
If the amplifiers had an input impedance of 600ohm.... then yes, you need a distribution amp... however, the amplifier input impedance is high at 20K.
https://www.soundonsound.com/techniques/understanding-impedance
Read the section on "Voltage Matching & Bridging Inputs", the example talks about tape machines, however it's exactly the same for amplifiers, as the mixer cannot tell the difference, it just sees impedance.
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You are looking at things from a simplistic point of view and it really does not work that way when it comes to chaining multiple amplifiers. I can assure you on that. It is better for serious sound to invest in a distribution amplifier. They are not expensive and will eliminate any second guessing.
Best Regards,
Edited by Elliot Thompson - 13 March 2018 at 8:09pm
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Elliot Thompson
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Risc_Terilia
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Posted: 13 March 2018 at 8:20pm |
I just use a rack panel that I've wired with XLR ins splitting to 3 XLR outs each. You can make it for a tenner and if you're getting quiet signal guess what you do? You turn it up from the mixer! Would I do this if I was sending control signals in a nuclear missile silo? No. Do a lot of people do this on a sound system? Yes.
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APW
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Posted: 13 March 2018 at 8:22pm |
Elliot
Thompson wrote:
… You are
looking at things from a simplistic point of view and it really does not work
that way when it comes to chaining multiple amplifiers. I can assure you on
that.
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FFS, he only wants to wire 5 amps together, he isn't doing the sound for Glastonbury. And YES it dose work like that.... .... BTW I started my apprenticeship the year you were born as an electronics service engineer working in TV and AUDIO before moving into medical and industrial electronics sectors as a design engineer!!
Edited by APW - 13 March 2018 at 8:26pm
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mini-mad
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Posted: 13 March 2018 at 8:39pm |
APW wrote:
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<p ="Msonormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height: normal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif"; mso-fareast-font-family:"Times New Roman";mso-fareast-:EN-GB">
Elliot Thompson wrote:
</span>
<p ="Msonormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height: normal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif"; mso-fareast-font-family:"Times New Roman";mso-fareast-:EN-GB">…</span><p ="Msonormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height: normal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif"; mso-fareast-font-family:"Times New Roman";mso-fareast-:EN-GB">You are looking at things from a simplistic point of view and it really does not work that way when it comes to chaining multiple amplifiers. I can assure you on that. </span>
<p ="Msonormal"><span style="font-size:12.0pt;line-height:115%;font-family: "Times New Roman","serif";mso-fareast-font-family:"Times New Roman";mso-fareast-: EN-GB"> | </span>
FFS, he only wants to wire 5 amps together, he isn't doing the sound for Glastonbury.
And YES it dose work like that....
.... BTW I started my apprenticeship the year you were born as an electronics service engineer working in TV and AUDIO before moving into medical and industrial electronics sectors as a design engineer!!
| As I said +1000. Just parallel the Damn inputs across all the amps.. I assume they are stacked on top of each other anyway. Way to may people OVER complicating things. It truly is that simple and the signal cable between each amp will be less the 5inchs. 125mm for the Europeans. You asked a simple question to a bunch of people of a broad spectrum of expertise. An LMS is overkill unless your having the separate amps doing different things..
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If it sounds like a gorilla is trying to escape, turn it down.
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Elliot Thompson
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Posted: 14 March 2018 at 11:04am |
APW wrote:
Elliot
Thompson wrote:
…
You
are looking at things from a simplistic point of view and it really does not
work that way when it comes to chaining multiple amplifiers. I can assure you
on that.
|
FFS, he only wants to wire 5 amps together, he isn't doing the sound for Glastonbury.
And YES it dose work like that....
.... BTW I started my apprenticeship the year you were born as an electronics
service engineer working in TV and AUDIO before moving into
medical and industrial electronics sectors as a design engineer!!
|
Then you should know with electronic equipment the power
supply plays a factor on its performance. And since you did not design the
equipment in question, you cannot come to the conclusion that your method is
going to work with no negative side effects.
Bear in mind what serious sound asked:
serioussound wrote:
I thought this was a simple newbie
question :)
But it seems little complex.
In professional bigger installations how do the pros doing it? |
For those that use multiple amplifiers to ensure no humming,
no loss of output voltage, in addition to not overloading the processor during
usage, we use Distribution Amplifiers.
Serious sound is requesting the professional way of sending
a signal to 5 amplifiers that do not offer an option of piggy backing from
amplifier to amplifier. The audio processor serious sound that is sending the
signal offers a singular output. Based on my experience of using 5 amplifiers
to cover low midrange, a Distribution Amplifier is in order. That is the
professional way of doing it.
Best Regards,
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Elliot Thompson
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