Recent content by MediumRare

Perhaps the level was too low. The -30 dB on the amp is not meaningful. Aim for 75 dB SPL when you check the level before doing the measurement. A good speaker should not go above 1% distortion at any point above 100 Hz at a near field SPL under 85 dB.

Thanks! Subs are crossed at 50 Hz, which was the sweet spot for smooth FR (tried plenty of alternatives). I did play around with the sub locations: Moved the left one a foot to the left; moved the right a foot in either direction (after giving up on having the right sub near the right main - all...

Hey folks, I'm hoping to get your help on finishing the setup of my room. Here's what I working with: - McIntosh MA6900: 200-400 WPC integrated amp with 5 EQ knobs (low Q @ 30, 150, 500, 1500, 10k Hz) - B&W 804 Nautilus speakers (good down to 42Hz) - 2 Rythmik F12 subs Before setting up...

Understood I’m thinking of the single knob that subwoofers have for integration. Not sure how they work but I bet you do :) It would be really helpful to be able to get a first-pass prediction of how to do a setup, then confirm with REW.

I, like many others, have an irregular-shaped room. Mine is a fairly simple asymmetry that I’m pretty sure will change the reflections enough that it will make a difference in the sub placement. Any chance you can add that capability (build room dimensions as a graphic polygon) to room sim...

I am trying to simulate two subs and two mains. When I select Reference there seems to be a bug that continually recalculates and causes odd behavior. For example, the second sub checkbox flickers and sometimes the second sub goes away in the output graph. Diagnostic file attached.

Looks terrific!

Any reason you chose 1/3 smoothing? Let’s see 1/12 or psychoacoustic.

@billm256 would love to see your FR results (and more, such as ETC) when you have them. I’ve heard your speakers at Axpona and they’re very interesting.

Congratulations, John. Can’t wait to try it out.

Here we go after extensive tuning of the subwoofer phase (105 deg), crossover (75, 24 db slope) and internal eq. Also a little eq courtesy of my preamp, but not digitally. Room is 17 W x 23 L x 9 H. Speakers are 104" apart nearly centered along the long wall (22" from wall) and both are 121"...

I tried both random and periodic with different sizes. With lower sizes I could hear pulsing, but didn’t seem to change the results much. Any comments there? I’ll rerun the analysis and post files if there are still important differences.

I most likely did not - where is that setting? Also, would that affect just the slope, or otherwise, what would you make of the differences in nulls/spikes?

I measured my system using the sweep method and then using pink noise. There were some pretty large differences, especially where the pink noise method showed a dramatic downslope from about 300 hz to 20k. There was also more LF nulls using the sweep method and a spike around 200hz using pink...

Funny story: I just did a moving mike test on my own listening room. I did it with and without a person sitting in the primary listening position. Then I left the mike on a tripod and repeated the measurement. There were barely a handful of ripples of differences between the three trials...