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I'm posting this in the DIY forum, hoping for some real expertise Also, this might turn into a DIY situation... I'm setting up a new listening room and took some preliminary measurements prior to room treatment, final speaker placement, etc. In these measurements I noticed a curious dip in HF response from one of the speakers, around the 5.6kHz mark (about 8dB down), and to a lesser extent at 9kHz and 13kHz, before the speaker catches up again around 15kHz. Please see the REW plots below. As you can see, the room response introduces a fair amount of unevenness, but the HF dip remains when the speakers swap places in the room. It also remains when I swap speaker cables at the back of the amp, so the issue is not generated by the electronics. What I'm wondering is, does this point to a dud component on the crossover, or to a dud tweeter? I'm thinking the former, since the tweeter manages to catch up at higher frequencies. I hadn't noticed this issue with these speakers before, but I haven't measured them in a while. The speakers are Rogers Ls3/5a (11 Ohm) from ca. 1992. Crossover frequency is 3kHz. Both speakers are at the exact same distance from the microphone position and equally spaced from front and side walls.
Hello from Bristol UK! My interest in speaker design started at 12 years old (I am 52 now) and has stayed with me all the way. I even did it professionally for a couple of years designing custom high quality PA rigs, but also ventured into bespoke hifi and a couple of studio monitors. I no longer work in the industry but keep my interest alive with home projects, with the additional challenge of working to a small budget and even less time to play with. Looking forward to chewing the fat with you Regards, El Crow