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Discussion Starter #1
Please somebody help!!! I need a simple explanation on how precisely to interconnect (with cables) microfone, audio interface, PC (with REW software) and my loudspeakers reciever, to be able to make room acustic testning with the REW?

Thanks a lot ;)

/Lars
 

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Discussion Starter #3 (Edited)
Hi again

Im not sure at all, but so far i came to the conclusion, that:

I`ll connect my reference-mic EMC-8000 to my audiobox (dont need mic-preamp - thats build in the box).
I download the REW software to my laptop.
I connect my audiobox to my laptop (via USB).
I connect my audiobox to my hifi system (using the aux port on my hifi reciever).
To measure db i just use my smartphone SPL-meter app.

The confusion begins when I look at youtube REW guide.

One speaks about I need to make "a loop" with cables on my audiobox (that is a cable from "in to out" ports on my audiobox). Whats that about?

/Lars
 

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Hi again

Im not sure at all, but so far i came to the conclusion, that:

I`ll connect my reference-mic EMC-8000 to my audiobox (dont need mic-preamp - thats build in the box).
I download the REW software to my laptop.
I connect my audiobox to my laptop (via USB).
I connect my audiobox to my hifi system (using the aux port on my hifi reciever).
To measure db i just use my smartphone SPL-meter app.

The confusion begins when I look at youtube REW guide.

One speaks about I need to make "a loop" with cables on my audiobox (that is a cable from "in to out" ports on my audiobox). Whats that about?

/Lars
The "loop" is simply a cable you (temporarily) connect from your computer's output back to the input. This will measure your sound card's frequency response, distortion etc. so it can be used for calibration purposes. This step isn't absolutely necessary but it will make your test results a little more accurate.
 

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Discussion Starter #5
Okay thanks. When you write "...your computer's output back to the input...", you do mean my audiobox? (external USB sound card).

/Lars
 

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If you're using an external USB audio interface, then all loopback connections will be made on it. There are two types of loopback:
  1. Calibration Loopback: I/O connection is made on channel normally used for measurement.
  2. Timing Reference Loopback: I/O connection is made on "spare" channel for loopback timing reference.
 
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