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Hi everyone, after having invested in heavily appreciated "fanboy" gear like REGEN USB , CURIOUS CABLE and a KLEIN DAC (See more here) in my first year with the CA community, I have had a read here on the "biggest bangs for buck" threat, which convinced me, that doing something on the acoustic treatment of my listening room should be the next step before investing even more on hi-end equipment. Maybe investment on useful hardware like the minidsp UMIC or an antimode processor still does make sense, even a bass enhancement with a good sub could be adjusted to the plan. I have two B&W 805s in a "golden" triangle position with my armchair and with the speaker positioning I am quite happy so far (in detail dist. to sw 61cm dist. to rw 131cm, dist. to other Speaker 181cm, dist. to listening position 181cm (157cm from the straight line between the speaker). What needs to be improved - in my opinion- , is a noticeable hiss from the left with sharp high tones , i.e. the harp sound in "Postcard Blues" /Cowboy Junkies/Trinity Session or some of Jan Garbareks sax notes are sounding kind of unwelcome. Plus, even I had looked for a n symmetric and equilibrate approach to the room, I sometimes get the impression that the left speaker is more present than the right, could that be related to the different surface of the sidewalls ? And yes, having exchanged the speakers from left to right gives me the same phenomena. ;-) In addition my speaker have some limits in presenting the deep lows as their frequency response is 49Hz - 22kHz at +/- 3dB and the frequency range should be -6db at 42Hz and 50kHz. For starting this project on acoustic treatment , I'd like to ask: - Is it inevitable to commence with a measurement of the room nodes or are some first steps to improve rather obvious for some expert eyes? - Which would be the software of choice for the measurement ? - Does a Android app like "Audio Tool" on a Sony Z1 could do the job, first hand? My first ideas had been about having some canvas or molleton curtains for the last 150cm on the sidewalls, and maybe some absorber hanging from the ceiling, allowing me to reshape parts the ceiling in a more symmetric way, but only on the right side (WAF), as I would not like to cut too much the luminosity in the room. That said, would a linen drapery on the glass front of the window have some effect as well beside it translucent looks ? - Is there anything I could improve on the first reflection points ? I welcome your thoughts and inspiration on the subject Merci Tom