[nick72]

JohnM wrote:

There can be pre-ringing on impulse responses from the soundcard filtering and/or the ADCs and DACs in the receiver.

I did a loopback test from my soundcards line out to the line in, removed all calibration files and C weighting. The result, no pre-ringing of any kind. Just the standard post impulse lobes like those displayed in the REW Help File (I can't say I understand why those post impulse lobes are there though)..

I guess the next step is to test the receiver. I'll need to figure out a way to test it. Any ideas?

JohnM wrote:

Widen the IR windows and see how the response looks. Generally speaking you will get good results with a single 256k sweep, it is rare that there would be a need for the higher S/N of multiple long sweeps unless you were acquiring an impulse response for subsequent post-processing.

Thanks John! I was hoping with the mutiple sweeps and higher samples would give me a better resolution on determining reflection points.
I will try widening the IR window and see what it gives me..

Thanks!