Hi!

I'm trying to determine the effect of connecting an XLR input/output:

output: Balanced, 600ohm or higher load, +4dBu nominal, +26dBu max

input: electronically balanced, 10k load, +24dBu max

I know both connections are XLR, but I have a nag that the impedance
differences might cause some signal attenuation (?).

By the way, how do I grasp the dBu units? What is it referenced to?


Thanks!

wrote:
Hi!

I'm trying to determine the effect of connecting an XLR input/output:

output: Balanced, 600ohm or higher load, +4dBu nominal, +26dBu max

input: electronically balanced, 10k load, +24dBu max

I know both connections are XLR, but I have a nag that the impedance
differences might cause some signal attenuation (?).

By the way, how do I grasp the dBu units? What is it referenced to?


Thanks!

What you describe is the standard way of connecting pro equipment. The
output is from a low impedance, that will drive any load of 600 ohms or
higher. The input presents a 10k impedance so will not load the output
feeding it. Your connections will work exactly as intended, with no
noticeable signal attenuation.

dBu has the same voltage levels as dBm. dBm is referenced to 1mW, so
0dBm has a voltage level of 775mV into 600 ohms. The "u" in dBu refers
to "unloaded", that is, a pure voltage into a high impedance.


S.

wrote:

Hi!

I'm trying to determine the effect of connecting an XLR input/output:

output: Balanced, 600ohm or higher load, +4dBu nominal, +26dBu max

input: electronically balanced, 10k load, +24dBu max

I know both connections are XLR, but I have a nag that the impedance
differences might cause some signal attenuation (?).

No. That's actually a totally standard connection. Too many ppl think audio has
to be 'matched' impedance wise. It doesn't. The above connection *doesn't*
appreciably load the signal. A matched one *would* by 6dB in fact.

By the way, how do I grasp the dBu units? What is it referenced to?

It's a voltage equivalent of the dBm( 600 ohms ) i.e. 0.775 V

Graham

wrote:
I'm trying to determine the effect of connecting an XLR input/output:
output: Balanced, 600ohm or higher load, +4dBu nominal, +26dBu max
input: electronically balanced, 10k load, +24dBu max
I know both connections are XLR, but I have a nag that the impedance
differences might cause some signal attenuation (?).
By the way, how do I grasp the dBu units? What is it referenced to?


If you really want to see the signal attenuation you can
use this easy calculator.
Take the output Z1 as the source impedance
and the input Z2 as the load impedance
http://www.sengpielaudio.com/calculator-bridging.htm
You get the level damping and the damping factor.

Cheers Jens