Recent content by PSuran

Hi everyone. Firstly, I'm not a physicist, so relatively "intuitive" explanations would be greatly appreciated :) I'm confused by the following: Let's say we have a partition / wall, which resonates at a specific natural frequency. If the resonance is relatively high Q (low damping), then...

OK then, try visualizing this: Free field -> We have two speakers 2m apart. The SPL meter is at the same distance from both, at the triangle apex. If I understand your point, for a low enough frequency, we should be measuring + 6 dB (double power + impedance change). Also, if we just scale...

Sorry, I don't understand this :( Please clarify. This makes perfect sense, and was my initial understanding. The only reason why I'm having issues with this explanation is the following: I have measured (in live sound and studio situations) that the ONLY REQUIREMENT for the + 6 dB SPL...

Thanks for the input. I fail to see how this can be the case. If we take into account the fact that we can never get more than +6 dB if two speakers are combinted, consider these scenarios: Situation 1: Two subs one next to the other. Play a 30 Hz sine wave. You pretty much have +6 dB in all...

I was thinking about it today from a different angle - the logarithmic nature of power efficiency.Everything we've been saying implies that: - Using two speakers with same total amount of power (2 x 50W) is more efficient than one speaker with same power applied (1 x 100W). - Speakers are...

Could it be this simple... When I turn one speaker on, it creates sound, but increases air impedance while doing so. When I turn on another speaker with the same power, it "works into" this increased impedance. This increase in impedance when two speakers are on is what accounts for the...

Exactly, that's the thing that's bothering me. If we look at it from another angle... 1. One, perfectly omnidirectional speaker in free field radiates 100 dB in all directions (point source - spherically) at a low enough frequency. 2. If we now add one dimension, mount the speaker into a wall...

I think I found the answer, but the problem is that I don't understand it :) :) http://www.linkwitzlab.com/faq.htm#Q21

Exactly, because having a wall behind the speakers adds 6 dB - because it radiates into half space. Placing a sub on the floor in the corner (quarter space) can add 12 dB or more... Having other reflections also adds "volume". And considering 10 dB is subjectively evaluated as doubling the...

Well, I'm not sure I'm confused about what you say. I understand that + 6dB is twice the voltage (pressure), but 4 times the power. Well, exactly! But, to account for the + 6 dB when we add "another active speaker", the sources say that + 3 dB is for double the electrical power used, and the...

Yeah, thinking off it... I think the answer to the following sub-question would put me out of my misery :) With power being constant, simply doubling the speaker size (cone area), increases the output for 3 dB. But doesn't the increased size come with downsides? Heavier, harder to move, more...

Yes, but the part I'm struggling to understand is how is it possible that I have half the electricity bill with the 2 speaker setup, vs. the one speaker setup at same SPL. Because with the 2 speaker setup I double the electrical power (turn on two speakers), but quadruple the acoustic power (a...

With what exactly? :)

And this: "In the meantime I found that "Situation 2" behaves like this. + 3 dB for double the power (remember, two active speakers) + 3 dB for double the cone size. So the total is + 6dB." This is the info I found in literature... Not by experimentation. I can link the text here if it helps...

Disclaimer: I'm neither an engineer, nor a physicist, so just a note that the answer is probably really simple, or I am making some stupid mistake. Take that into account please :) And I really appreciate the effort. To answer your above question. I am not actually measuring anything except...