Recent content by Leo11

Thanks for your answers. Considering the calibration uncertainty of the microphones (usually bigger than deviation), as well as the unknown of the calibration field (diffuse, free, etc.), does it make sense to estimate the phase as a minimum phase system? Making longer sweeps is something that...

I would like to maximize the quality of my measurements by average over multiple acquisitions, in order to minimize noise interference etc. Is there a way to do this with Audiolense? In addition, can microphone phase calibration be used in Audiolense or is it left out?

Thanks for the reply. I have been busy elsewhere lately and have no way of experimenting. Anyway, one thing is not clear to me. I have two speakers and two subs (equal). If I wanted to flat the summed response of the two subs, each feeded with 0.5L+0.5R, but also individually corrected in time...

Okay. Thanks for the reply. I take this opportunity to ask another question about the function to make the subs mono. Typically the audio tracks have low frequencies already in mono below 100Hz, where the stereo content in fact would be useless for spatial perception. When you have a setup with...

Hello everyone. I have a doubt about the process of measuring and creating filters, especially in light of the latest SW releases. If I make measurements at 96kHz, for example, and export the filter with 65K taps, I will get about 1.5Hz resolution. While with 44kHz it should be about 0.7Hz. Now...

It seems to me that from the tests I have carried out I have excluded all potential hardware and setup related causes (correct me if I'm wrong). What remains should be between Core Audio and REW. I am contacting Motu's technical support to also get their feedback. I suspect that this is a rare...

This could explain the issue of measurement with sweep explained above. But in the case of the unstable spectrum it happens both if I start the generator first with respect to RTA and vice versa...

Every sample rate setting is matched at 44.1khz (REW, Mac Audio Midi, Motu Ultralite) and the Ultralite is set to internal clock. On Windows with ASIO driver I have no problem. Motu's driver is rock solid even at lower buffer values (but they also include safety buffers which value is not...

@John Mulcahy I'm not sure I have solved it. I'm damning myself to understand what problem there is. I explain: I am now using my Motu Ultralite MK5 to make digital loopback measurements (Mk5 has 2 channels to digital loopback output channels, bitperfectly). I'm sure everything is set up...

Mac M2 Mini REW latest version Kushview Element DAW MCFX Convolver (VST) Motu Ultralite Mk5 (USB) Beyerdynamic MM-1 with level calibration file (Ultralite is the mic pre so no clock drift between in and out). Hypex NC252MP amplifier Dali Opticon 2 MK2 speakers Everything at 44.1kHz...

I am investigating and indeed it seems that the cause of the phase shift is the convolver (MCFX) or REW. But it looks more like an artifact of measurements. Let's leave this question out for a moment then. As for the IACC, what do you think? Let's say that I would also expect a general...

Bernt, take a look at the attached graphs showing full, early and late IACC coefficients for raw speakers (in this case excluding subs) and speakers + subs corrected with Audiolense and Dirac. Audiolense seems to worsening IACC over 4kHz compared to raw system. All measurements were taken in the...

Thanks. When I can, I will try to post an image of Rew's IACC measurements. However, I mean the time length (millisec) of the frequency dependent window. From the Rew spectrogram you can see more or less the distribution of the Peak Energy Time. Leaving aside the sudden peaks due to...

Thank you Bernt for your contribution. I will do some experiments. What do you think about determining the amplitude of the FDW using the spectrogram in REW? Shouldn't Peak Energy Time, excluding large room resonances, be a good indicator of the necessary window? I also take this opportunity...

Dear users, I am trying to make good measurements to establish the correct room correction approach. REW has a great guide and explains well each option, but despite this, I am struggling to understand what is the best setting for the spectrogram. In particular, I can't figure out when to use...