Speakers near the floor have a +3dB bass boost- against two boundaries = + 6dB, three boundaries = +9dB bass boost. So be aware that a speaker’s low end will be different (in any room) depending on how close to boundaries the speakers are placed, regardless of other factors. So lifting a speaker 4 feet off the floor will make it sound like it has less bass.
Speaker stand project
After cleaning out the barn workshop, I reduced my stock of lumber but saved some interesting bits. My plan is to build some speaker stands for a pair of vintage JBL L19's. Yes, I know that these aren't anything great, but it's for a third system and they have sentimental value. After some research, I concluded that I should use a taller stand than the one commonly shown in JBL photos which is about three inches off of the ground and tilted back. To raise the tweeter to listening position, I will need a stand that is approximately 27" tall. After some searching for design ideas, I am hoping to build a modified version of this:
My question is whether four feet on the ground is any different from a platform on the ground - as is used in many designs? Obviously, some of the stick or pole designs need the lateral support, but I see platforms on other designs as well. I guess that the added mass of the platform could make some difference. I will be using some fairly heavy pieces of wood including a two inch thick maple top. I will install an adjustable spike on each foot (for leveling primarily) and to get through the carpet. This will be more of a furniture building exercise than an audio upgrade, but I hope that I won't be making the sound worse by raising the speakers. Any thoughts regarding the design or the proper height for these speakers will be appreciated.
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