My problem:
Impulse Response reading is unstable and shifting up to a couple ms.
REW Version 5.20 Beta 27
Maybe someone knows what I am facing here, or how to solve it. It is regarding an issue where the IR, or ETC always shifts even if I just repeat measurements.
This never happened in the past, using only analogue through the soundcard, and maybe it is just a software bug.
My assumption is, that it has to do with the fact, that I have two output devices, a USB Soundcard and a Surround Processor connected to the computer via HDMI.
The Surround processor drives the speaker, the Soundcard serves as Microphone capturing device as well as Timing reference output and Input.
Routing is all correct.
HDMI 8 channel out via Asio4all, microphone in via USB Soundcard Channel 1, Timing Reference via USB Soundcard output 2 and looped back to Input 2.
What is interesting is, that I always have a negative timing in IR, obviously due to the Processor DSP throughput.
All Delays and Processing on the Processors is disabled, except the speaker sizes and crossover points and Bass Management.
Processors used, Marantz 8002, Altitude32, Storm.
Why I am asking this, and why I am not using Acoustic timing reference, because I need to align the phase of all woofers and speakers, which is not possible with acoustic timing reference. I need to see the whole system phase response including what the processor does, to get the good phase reading. Right?
Who has had the same issues? And solved it…