Questions for Smart People

[maestro_dmc]

I keep finding all these HUGE gaps in my knowledge that I want to fill in. These are some questions for those who have knowledge above and beyond the average HomeRecording Joe. Hopefully others need these answers and more, and hopefully this isn't too redundant.

What are the important measurements to know when it comes to say a Headphone Amp?

For instance, how would I know without frying the thing if I can run a Headphone signal over lets say a 100' mic cable?
What measurements can I take, and can I use My Radio Shack Multi-tester? What do I need to look up in the manual?

Also:
How can I Measure the resistance in Ohms of a set of headphones, or even a speaker? When I connect the multi-tester to an 8 Ohm speaker it never says 8 ohms. What am I doing wrong?


How do I get rid of an AM Radio station that only comes in on ONE channel of an Installed 16 channel snake?

Can you use up all your phantom power? For instance, can I run 2 or even 3 LDC mics that each require 48v if the board only has one switch for all of it's phantom?

Things that make me go Urrgh!

That's it for now. I'm sure I'll think of more.

 

[The Green Hornet]

Yo Maestro & et. al:

I'll just try to respond to one of your interrogatives.

Why would you need 100 feet of cable for cans? Do you have a 200 foot studio?

A can amp is used in a studio for more people to use cans -- like multiple singers, or micing drums, etc.

So, I can't quite see where 110 ft. of cable would apply to cans. If on stage, why would you want to be 100 away even if you were an engineer?

Maybe I'm just not sure about your question.

Green Hornet

 

[regebro]

For instance, how would I know without frying the thing if I can run a Headphone signal over lets say a 100' mic cable?

Only way to know is to have the circuit-drawings and deep electronics knowledge.

But it would probably work.

How can I Measure the resistance in Ohms of a set of headphones, or even a speaker? When I connect the multi-tester to an 8 Ohm speaker it never says 8 ohms. What am I doing wrong?

You are measuring DC resistance, not AC impedance. You need to use a signal generator and an oscilloscope (or an impedance meter) to measure that.

How do I get rid of an AM Radio station that only comes in on ONE channel of an Installed 16 channel snake?

You fix the shielding on that channel.

Can you use up all your phantom power?

Oh, sure.

For instance, can I run 2 or even 3 LDC mics that each require 48v if the board only has one switch for all of it's phantom?

That depends on how many amps your mics uses up and how many amps your board can push.

It shouldn't be a problem, really.