Draw the room before moving the speakers
A plain room sketch makes small placement experiments easier to understand, repeat and undo.
LISTENING ROOM NOTES
A listening room is also a room where people live. There may be a doorway on one side, a bookcase on the other and only one sensible place for the sofa. Before trying to turn those constraints into an equipment problem, put them on paper. A quick drawing can give a placement experiment a clear beginning and a way back.
Make a useful sketch, not a floor plan
Draw the outline of the room, then mark the listening seat and both speakers. Add the large things that make the two sides different: a window, an open doorway, a tall cabinet or an adjoining space. Use approximate dimensions if exact ones are inconvenient. The point is to record relationships rather than produce a building survey.
Label the first arrangement A. Record how far each speaker is from the listening seat and note its position relative to nearby walls. If a dimension is uncertain, say so. A drawing with honest approximations is more useful than a neat sketch that leaves out the awkward furniture.
Choose a sensible reference
For a conventional stereo reference, Genelec describes a symmetrical arrangement with the listener at the point of an equilateral triangle and the monitors directed towards that position. Treat this as a starting geometry, then consult the placement instructions for your particular speakers. A domestic room may not allow the reference arrangement, and different models have different requirements.
Write down the compromise instead of hiding it. Perhaps the right speaker sits nearer a side wall, or the seat cannot move away from the back wall. That note is the question your next experiment will investigate. It is not evidence that a purchase is necessary.
Change one relationship
Pick one reversible move: a small shift of the seat, a matched movement of both speakers, or an adjustment allowed by their manuals. Keep cables free from strain and leave required ventilation clear. Do not move unstable stands or heavy furniture alone. Record the new positions as arrangement B before playing anything.
Use the same short musical passage in each arrangement and keep the playback setting consistent. Describe a specific observation, such as where a central voice seems to sit, rather than writing only that one version sounds better. If the difference is unclear, record that too.
Keep the version you can live with
Return to A once before making a decision. Consider access, comfortable seating and everyday use alongside the listening impression. Save the two sketches even if you keep the original arrangement. The useful result may be a better question for next time, supported by a room you can actually recognise.
Placement reference: Genelec: monitor placement. The sketching and comparison workflow above is an editorial exercise.