Sonist Audio Concerto 4 Speakers... performance questions
I am just getting my system together one piece at a time. I started with the speakers... Sonist Audio Concerto 4’s in the memorial finish. I bought them used locally because new they were way too expensive for me. I had hoped to get a pair of vintage Klipschorns but could not find a pair i could afford AND my room was a bit small for them truth be known... In any event the Sonist Concerto’s are really nice looking and have a nice sound at modest and medium loud levels... FYI, these speakers are high efficiency... sensitivity 97db; 27Hz - 40Khz.
Anyway, I have a vintage amp in great shape (I think). It’s a budget amp... a Superscope A225... not a common size... but rated at 15 watts per channel; 20-30k KHz; distortion < .5% at 4W; Signal/Noise 70 DB (not so great). Superscope of course had a relationship with Marantz.
Overall, the speakers are very nice sounding... perhaps a little light on the base... but that was not unexpected. My concern is that they perform well up to 90 db... then there is noticeable distortion. This is achieved with the volume at about 40% max... so.. most likely 6 or 7 watts assuming the dial turn is proportional to watts.
So, I am wondering if this is just the limits of the speakers.. or if i may have an amplifier issue (both channels behave identically). To clarify, there is no popping per se... not even cracking... just a distortion.. muffled rumbling/vibration... not a happy sound so i back right off.
My cables are not loose in any way but are just general consumer grade... I am going to upgrade those tomorrow... any thoughts appreciated on my situation
Jeff in Western Michigan