[omegote]

I was (and still am) in the same situation as the author two years ago. I bought a pair of JBL LSR 305 that I placed at each side of the screen, roughly 120cm away from each other and at arms length from me. They're about 30cm away from the back wall.

The problem I have is with the bass. Standing in the normal position to interact with my PC, the bass strength is low. Now, the moment I move back about 1 meter, the bass strength becomes great (the one I'd expect from this pair of speakers).

I really don't know what to do :/

[dsr_]

Take a look at the back of your LSR305. There's a switch marked LF Trim. (There's also a HF Trim.) It has three positions: cut, normal, and boost. It's a built in EQ designed for handling room boundaries.

You'll need to set it on both speakers.

[52-6F-62]

This, plus you could place isolation pads underneath the speakers to prevent the low frequencies from causing resonance in the desk or other platform they're on if they aren't already. You can find some pretty cheap options these days that should do the trick.

[grandinj]

You're probably in a room null when in your "normal position to interact with the PC". Try moving them closer to the back wall. Or there are room treatments like adding some kind of absorption panel to the problematic wall(s).

[ssssss777]

If it's a room mode, you might experiment with where your desk is in the room and by extension where your ears end up being within that space. Or add a subwoofer whose placement you can optimize independently from your speakers.

Taken to the extreme is the "Geddes Approach" which use multiple subwoofers placed around the room and lots of EQ provide a smooth low frequency response at the listening position.

[bombcar]

Try moving one speaker back and forth - they may be angled such that the different phases are canceling bass right where you sit.

[scns]

You can't trick physics. There are notes so low (huge wavelength), you can only hear them, if you are several meters away.

[colanderman]

Waves don't work like that. Otherwise it would be impossible to hear bass through (good) headphones.

The issue is that, because of reflections, waves whose wavelengths are on the same order of magnitude as the distance from the speakers to the wall are getting cancelled out, depending on where you listen from. It is a well-known phenomenon.

(Higher frequencies which are multiples of the missing bass frequencies will also be attenuated, but this is less immediately noticeable.)

[johnvanommen]

Actually, sound DOES work like that.

For instance, if OP has his speakers located 57cm / 22 inches from the back wall, there is going to be a very deep null at 150Hz, due to the reflection from the back wall. (150Hz is 227cm long.)

If OP is listening in the nearfield, that dip will be obnoxious.

On the other hand, if OP is listening at a distance of two meters, the dip will be LESS obnoxious because there will be dozens of dips and peaks in the response, contributing constructive and destructive interference, simultaneously.

This is one of the reasons that loudspeakers are generally measured under two conditions:

1) very very close. For instance, a woofer can be measured with the microphone less than a centimeter from the cone

2) But the preferred method of getting a full range measurement is to measure the speaker outside, far away from any reflective surfaces.

[colanderman]

> there is going to be a very deep null [...] due to the reflection from the back wall

That's exactly what I said.

I read the grandparent to imply that distance from the source was the only factor, that one needs to be a certain distance from a source to hear bass frequencies at all, which I'm sure you'll agree is incorrect, as we both seem to have a correct understanding of the physics involved.

[jpitz]

What would be an example of such a note?

Low E has a wavelength of a couple meters, no problems hearing that close up.