I found a useful article describing what kind of impact the room itself and the placement of the speakers have on the sound (link below):
https://sonarworks.com/blog/studio-monitor-test-and-calibration-5-speakers-in-a-bedroom-studio/Five different good quality studio monitor speakers were tested in a "bedroom studio" shown in the attached figure.
The resulting frequency responses are shown in the next figure: as can be seen there was a strong overall boost in the low mids ~80 – 200 Hz and dips at 100 Hz, 300 Hz, and just below 1 kHz. The boost of the low frequencies is caused by the standing waves or room (resonance) modes. The dips above that are caused by out-of-phase reflections caused by the table, the wall behind the speakers and the floor etc., I think.
The frequency responses can be improved considerably by using EQ: the optimally EQed ones are shown in the next figure below. This requires a good measurement system, but even without that, the general EQ idea (as indicated by the example frequency responses) can be applied for avoiding too much low frequency boost.
There are many reviews of the HS5 on the net. The following seemed to be one of the more valuable ones to me:
https://sonarworks.com/blog/yamaha-hs5-studio-monitor-review/The frequency response of the HS5 in different rooms is shown in the attached figure.
Their conclusion:
"The unusually early bass roll-off on the HS5 might make these speakers harder to calibrate, especially in well treated rooms. The room gain mostly takes care of the bass, so the [Sonarworks] plug-in only needs to tame it down a little, but for HS5 in treated rooms bass boosting was needed. On higher SPL’s the 45W amp could start running out of steam."
Their overall score: 7/10
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