Support Forums › Forums › FIR Designer M Support › How to import Magnitude only .txt files? › Reply To: How to import Magnitude only .txt files?
Thank you very much for the thorough explanation and suggestions! I’ll do my best to work through those – it’s still a steep learning curve for me.
Addressing a few of your points initially, which leads to more questions:
– Although I’m starting with EV’s Mag and Phase measurements for one cabinet in their anechoic chamber (specified as “10ft 4VRMS 1/12 Oct”), I am also starting with their latest IIR preset parameters, which I’ve used for years and have been generally happy with their “voicing”. My expectation with FIRdM is simply to improve the phase linearity and get even better sound, taking advantage of the modern DSP available in my Powersoft X-Series amplifiers.
– Because the measurement files are > 25 years old, DEC mentioned some uncertainty about whether they are “flight time corrected” or not. As you suspected, the IIR presets do reflect the respective devices’ relative physical path length differences: LF 20 samples, MB 15 samples, HF 25 samples. I did the Import adjustment (-458 samples) you mentioned, but I also left in those smaller path length adjustments. Or, should I have turned them off? It measures and sounds good with them on.
I have not received the examples e-mail you mentioned. But I’m going to send you the revised .fds I worked on this morning after reading your message. I welcome your thoughts and further suggestions, please. I did use the Auto Phase, and it looks nice and flat, except I could figure out what to do for the LF. My OSM measurement also shows the phase wraps in the low-mid, although it’s difficult for me to get good measurements in the limited space in my warehouse area.
Thank you again for your continued personal attention and support!
RBT