Quote:
Originally Posted by
Lilith
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the myth that it's not a good idea to put rear ported speakers close to the wall seems quite common. I read it everywhere and even in manuals.
But do you ever read it suggested by reputable studio designers?
Quote:
Yamaha e.g. suggests to put the speakers 1-2 feets from the wall IIRC.
Yamaha's customer base are primarily people in untreated or poorly treated rooms though, so do keep that in mind. In an untreated room you'll likely find the LF overpowering if placed close to the wall. Genelec on the other hand have covered the effects of front wall SBIR in their literature, warning about the phase cancellation that takes place with speakers pulled away from the wall.
Quote:
Originally Posted by
Lilith
β‘οΈ
Just wonder why so many people are wrong on that point.
People with a good understanding of room acoustics or who have used room measurement programs to test these things and get a better understanding of them are a minority.
If you pull your speakers away from the front wall you will delay the heavy low frequency reflection. Delayed sound mixed with direct sound causes out of phase frequencies. It's simple as that.
A speaker port needs to be unobstructed to perform its job. That's it. If your speakers are rear ported and you place them close to the wall facing straight forward as some may do in their livingrooms, then sure.. that's going to interfere with their operation. Don't do that.
One of the great longstanding errors people make with room acoustics is that there are a lot of things which may be right or wrong ONLY under specific circumstances. And people who don't understand that or the circumstances will incorrectly assume something they saw or heard transfers over to other settings where it does not. The devil is in the details, as they say.
Quote:
Originally Posted by
Wayne
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"Generally, a gap of 0 to 8 inches (0 to 20 cm) between your speakers and front wall is a good starting point to minimize coloration caused by SBIR. But, check your loudspeaker specs for a recommended minimum distance.
For example, Genelec recommends a minimum distance of 2 inches (5 cm) to allow for amplifier cooling and rear opening sound radiation."
It's best not to post stuff like this as it's missing critical information needed to correctly implement it. It will be right or wrong depending on whether untreated vs treated room, specifics of room treatment, and whether the speakers are angled or not. If the speakers aren't angled then yes 2" from the wall is the minimum Genelec recommends, but that generally isn't applicable for studio use. And certainly there will be a BIG difference between 0 or 8". Some may get the mistaken idea that anywhere in that range should be fine.