Danny Richie of GR-Research recently did his extensive analysis (including measurements with his Clio system) of the Dynaudio Special 40. Looks like Dyn cheaped out on this speaker that originally sold for $2995. The woofer measures suprisingly poorly with notable peaks at 1110 hz, 3400, hz and 10K. Danny refers to it as "rough". There is also a significant ringing component to the woofer in the spectral decay. John Atkinson obtained effectively identical results when he measured the Special 40 in Stereophile. The parts for the crossover, wiring and fill is also problematical. Iron-core inductors, sand-cast resistors, cheap poly and electrolytics caps in the XO, and el-cheapo, 16 AWG PVC insulated clip-on leads for the internal wiring, and a poorly-damped cabinet with cheap fill. Danny's reaction... Danny did say that Dyn spent an extra 10¢ and used binding posts that are non-ferric, so..that's good. Danny went through and fixed the issues with the drivers, their measured performance and improved the overall frequency response to be smoother and within 1-1.5 dB. Also knocked down the knee at 1100 Hz peak in the mids. You'll also note that the behavior of the woofer is quite a bit smoother. He also reduced the ringing component of the woofer to a considerably lower level in the spectral decay. Looks like the Sp40 was built to a price point, and Dyn used some pretty cheap parts in the BOM. An extra $125 in wholesale parts cost could have fixed the issues with the stock speaker. I'll leave you to watch the video to see how Danny fixed these issues with his mods. Needless to say, he improved it quite a bit. Most notable is the improvement in the vertical off-axis response with the drivers remaining in phase as you go up. Total cost of the parts for upgrading the Dyn Special 40 is $245. Having built one of Danny's speaker designs using his parts, wire, and drivers, I would think the Special 40 is quite a bit better with his modifications.