1. My main stereo computer is actually an RPI running MC. I'm using another windows PC for all the measurements because its easier, my question is; once I finish the process and have the convolution filters working properly on the PC, can I just copy over that file toe the RPI and have the same results by running it via JRiver on the RPI?
I haven't done much testing with convolution on the Pi, but I would not be surprised if it didn't have the CPU power to run a long convolution filter. Assuming that convolution works on the Pi, it should be as simple as moving the file over, but that's a big assumption.
For example I have a very short and simple convolution filter that runs at 80x realtime on an i7-2660k; I have longer convolution filters that do more and only run around 30x realtime; an RPi 2 has roughly about 1/60 of the computing power of an i7-2660k according to the best benchmarks I've seen. So even if convolution "just works" in JRiver ARM you'll have very limited scope for your convolution filters. Convolution is very computationally expensive, so I wouldn't count on doing all your eq in convolution.
JRiver's parametric EQ is significantly faster and less computationally expensive than convolution (even doing the exact same filtering), so in keeping with the guide, I'd advise you to do what you can in PEQ, which I can confirm works just fine on the Pi, even with a moderate number of filters (eventually you will bump against the Pi's limits though, even there).
2. my system has two floor standers (B&W CM10s2) as well as a sub that's connected directly to the dad. I don't have a dedicated sub channel so I understand I have to EQ the whole system together with the sub? Shall I start with measuring the speakers on their own and then use the measurements to calibrate the sub (via REW?) before proceeding to EQ everything together?
Since you can't actually correct the sub separately, I'd suggest measuring it all together, you'll quickly see if the sub's volume matches the speakers when you take the 1 meter measurements. That said, depending on where you cross to the sub it might make sense to separately mic the sub as an additional stage (if you cross above 80 or 100Hz or so) or it might not matter (below 40Hz I certainly wouldn't bother unless it were very far from the speakers or I could correct it separately).
3. According to the guide I should use Holm to close mic my speakers - they are big 5 driver 3 way speakers (mot massive speakers but certainly not small). Shall I close mic each driver? there are 3 woofers...?
Thank you, any advice would be great!
I'd suggest measuring each stage separately (low, mid, and high separately). If your mid and high stage only have one driver each, that should be easy, just follow the guide.
For your woofers, the best distance will depend on how the woofers are arranged and whether or not they all play the same frequencies. I have a pair of washing machine sized speakers with four woofers arranged in a square and had no issues just positioning the mic three inches from the acoustic center of the four woofers. Folks with MTMs or 2.5 or 3.5 way speakers will need to adapt the formula a little bit.
But it looks like your speakers just have the three woofers vertically stacked, so my advice to you would be to take your low frequency stage measurements at 3 inches from the center woofer (the acoustic center).
The bottom line is that your 3 inch measurement should look somewhat similar to your 1 foot measurement but much smoother. If your 3 inch measurement looks very jagged or very different from your 1 inch measurement, try measuring a little farther out (an inch at time) until you get something sensible. But you should be able to measure at 3 inches with that driver arrangement.
Author
Topic: Noob questions about room correction with JRiver (Read 4745 times)