My summer holiday has started and with it the time to undertake a tidy of the listening room. I had to move my speakers to vacuum, so I thought it’d be a good time to revisit speaker placement. I think I’ve watched around six hours or YouTube videos on the subject, and the results have been very much worth the time invested. 

My room is problematic in that it’s a square. The kind of shape that should be really difficult to get good sound in. Fortunately it’s also a dedicated room, so I can place things wherever I like. Lucky boy. My system has sounded pretty good for a few years, but I’ve always wanted the sound to be a little more free of the boxes with more image depth. 

The two “rules” I kept coming across were the Rule of Fifths, and using the Golden Mean to deal with a square room. Each of these rules improved aspects of the presentation, but together they have been a bit of a revelation!

The Rule of Fifths states that you want the acoustic center of the speaker drivers 1/5 from the wall, and your listening position (your ears) the same. In my room that puts the front of the speakers 1.16m from the front wall and my ears the same distance from the wall behind me. This had the effect of smoothing out room response wonderfully well. In particular there are no more bass bumps to worry about, allowing much more clarity in the midrange. The side to side imaging was very much better! However, it exposed that the treble was running a little hot for my liking.

The next step was to try using the Golden Mean to determine how far from the side walls my speakers should be. Keeping the 1.16m from the rear wall and multiplying it by 1.6 (5:8 ratio) gave me 1.855m from the side walls. Well, what a shock! This change of position removed all treble glare and hotness AND increased the depth of stereo image in a way that is spectacular. To achieve this move I had to shift one speaker 13cm and the other 7cm, both towards the wall. With the speakers further apart I needed to increase the toe-in a little to get the center images focused again.

The sound is now well free of the boxes and the deepest I’ve heard at home. The stereo width is outside the boxes. Well recorded pop is crystal clear and orchestral recordings have gained a sometimes cavernous acoustic. I have a few loudness wars albums like Califonication by the Red Hot Chili Peppers and they are now completely listenable without the need to adjust the volume control on my Majestic.

All in all, this zero-cost improvement to my system took around 7 hours to achieve. Most pleasing is that I’m now getting far better value for money from my system. The PMC speakers sound as good or better as I’ve heard them in any dealer showroom, the detail strengths of the RP8/Apheta2 combination are being taken advantage of, and my Slee electronics are showing yet again that they more to give.

I’m a happy camper.

Mick 

Yowza.

Mick.

   An update on this adventure. The music room set up is still bringing joy. I quite like Klemperer conducting the Philharmonia is Bruckner 4 as it’s a wonderful performance. It’s also a wonderful recording and I’m hearing the skill of the engineers properly now. Fantastic depth, width and height to the image, such that when there’s a lot going on you can keep track of each section of the orchestra easily within the wonderful whole.

But that’s not what I wanted to write about today. I’ve dared to venture into the lounge room and start moving things about (my wife is away on a girls week in the city, so it’s just me and the kids). The 1/5 rule isn’t going to work, as it moves the speakers too far into the room for acceptable home harmony. However, the Golden Mean part is showing very promising signs. 

I have scope to move the speakers further apart, so I’m measuring out from the corners in the 8:5 ratio. I plotted points along the floor in that ratio and laid down a strip of masking tape to make diagonal lines out from the corners. I’m simply moving the speakers back and forth along the lines and listening to the differences. Whilst they’re too far apart for any meaningful bass response, the imaging is good and the sound is clear. Again, some depth to the image.

The upshot? Moving out along the diagonal tape marks I found where they sounded their best, and hey presto, it’s bang on the 1/5 measurement into the room. I’m trying to find a way to subtly mark that spot for listening when nobody is home. 

It’s a very modest system (second hand Mission 781 standmounts and an eight year old Wadia PowerDAC Mini (all of my good Slee gear is in the music room)), but the speaker placement effort has brought the same types of improvement. Well worth the effort.

I see there have been 62 views of the original post, and I’m hanging out to hear your thoughts and results of your own experimentation!

Mick.

I've never managed to achieve quite the same depth of image in my smallish 3m x 5m room with
fairly limited speaker placement options but have managed to find a good compromise.
Your scientific approach has worked well Mick.

  https://www.ecoustics.com/articles/stereo-speaker-placement-optimum-sound/ - https://www.ecoustics.com/articles/stereo-speaker-placement-optimum-sound/