Recent content by pinox67

Ok, since the time delay is unknown and the output is captured 'randomly', the phases of f1 and f2 can be any. Let's say that through other measurements I was able to get an estimate of the Time Delay, to be incorporated into the phase correction in step 3. Are there any other caveats? How do...

I think the measurement procedure could be this: Given in the input with two tones (f1, f2) at the same level and phase, it is captured the output by the device for a time window, let's say of 1M samples, with fs large enough to include the higher intermodulation product. The samples are...

In the input signal, the two fundamentals have the same phase. In the output they may have different phases due to linear alterations. It could be left to the user to choose which of the two fundamentals to use as a reference for intermodulation products and the other fundamental itself. Perhaps...

Hi, A question about the information reported by the RTA. When I use a Dual Tone test signal (SMPTE, DIN, ... or Custom) is there any way of also detecting the phase information of each intermodulation product via the RTA, similar to what the RTA always does with a single-tone signal?

Thank John. Well, if you use for vertical scale dBFS or dBr, the level is set instead at 3dB: If I generate the min phase, from SLP & Phase view, with setting like yours: Add LF tail: Start: 20 Hz, Slope: 0.0 Add HF tail: Start: 80KHz, Slope: -12 dB/octave Apply freq. warping to HF tail...

Testing my signal processing programs, sometimes I produce a csv file containing the Frequency Response of a filter and then I import it REW with "Import frequency response" item. Below there is a simple low pass Butterworth filter at 1KHz, 2nd order (formatting with tab separator is lost in the...

I had a (small) dummy load built. Simplifying, the circuit is composed of 4 resistors of 8ohm 200W for each channel, which can be paralleled progressively with input, creating loads of 8, 4, 2.6 and 2 ohm. So, on 2 ohm it can reach up to 800W. The input connection from the amplifier is always...

From pictures, I see that the door is in a side and open or closed, it is not in a symmetric position respect to subs emission, in the front wall. This is sufficient to cause some differences in their response. If you cover the door and its symmetric position in other side with a heavy curtain...

For a perfect symmetry in measures all shall be symmetrical: room, subs type and setting, placement and any furniture. Also a door or a window not in symmetric positions can cause differences. However you should also measure the sum of two subs to see what you ear in a normal listening...

Dips and peaks in low frequency bands are mainly due to room resonance modes, that can be more or less excited by louspeakers position. A big contribute is due to the reflection of sound from loudspeakers with the near front wall and corners. Moving loudspeaker can help yes, but I think it would...