Beginner improvements for room acoustics; very helpful Darko video on reverb and RT60

I often find myself trying to help friends new to audio take their first steps toward improving their sound. Taming room reflection is, of course, the first step.

Many respond by saying some combination of "Why would I need that?" and "Isn't a rug and furniture enough?"

Darko's video explain the answer to both of these questions, and does so by explaining in layman's language what the sweet spot for reverb typically is, and why furniture and rugs are not often sufficient.

He describes a reasonable, middle way between going all out on room treatments and doing nothing. At the very least, he says at the end, do the ceilings.

Again, old news to many here, but possibly of use for some here and for anyone advising others.


From an acoustic perspective, any normal sized domestic room is small.  In other words in low frequencies the room is dominated by resonance modes rather than a uniform diffuse sound field.

From an acoustic perspective, any normal sized domestic room is small.

I suggest you watch the video. Darko clearly states that this is not about low frequencies. If folks watch the video, they will see why RT60 is relevant.

In most small domestic rooms it's not that big of a deal. Darko is not someone to go to for acoustic advice or really any advice IMO. If you're doing HT in a dedicated room it's a good idea because it can help get better sound field over more seats.  I've done some measurements using REW for interest only.


RT60 is a measure of how long sound takes to decay by 60 dB in a space that has a diffuse soundfield, meaning a room large enough that reflections from the source reach the mic from all directions at the same level. Domestic rooms are usually too small to have anything approaching a diffuse field at low frequencies as their behaviour in that region is dominated by modal resonances. As a result RT60 is typically not meaningful in such rooms below a few hundred Hz. Use the RT60 Decaywaterfallspectrogram and Decay plots to examine the decay of low frequencies in domestically-sized rooms.

@djones51  I'm interested to hear you say that about Darko. Your posts have always struck me as exceptionally well-informed, and I get a good impression from Darko, too. Can you tell me why you think he is generally untrustworthy or at least someone folks need not pay attention to? Thank you.

I don't think he's untrustworthy just in it for money which is fine but I take these  YouTube  guys that have a vested monetary interest with a grain of salt. the video you posted has some good advice and some lousy advice. For example when he says you can't get exceptional sound in a normal living space without room treatment from ANY speaker that's nonsense. Cardioid speakers can work very well in untreated rooms.  Wall to wall carpet with thick pad is good floor treatment. Speaker directivity and listening distance is equally important. Is a dedicated listening space optimized better? Well yes but very few people can have that.