For those of you with turtables sporting the Rega RB303, particularly RP3 and RP6 owners who want to take a big step up in cartridges from the Rega Exact 2, the Dynavector 17D3 (at 15.8mm in height) is essentially a straight swap-out for the Exact 2 (at 14mm in height) or any other current Rega cartridge. Before checking the cartridge instruction manuals on the Dynavector site, I assumed that all of Dynavector's cartridges were 18mm-18.8mm in height just like the popular and excellent 10X2, 20X2 and XXMK2 MC models. Turns out, the 17D3 is the outlier. Prior to actually checking the Dynavector site - good grief, I wish I took my own advice more often - I installed the 17D3 using a 4mm spacer. The 17D3 looks significantly taller and wider that the Exact 2, so that appearance (along with the assumption that the 17D3 actually is, like other Dynavector models, almost 5mm taller than Rega carts) led me to use the spacer. The result, after a really easy overhang and alignment with a Feickert protractor (highly recommended), and after an azimuth check to ensure I had not overtorqued one of the cartridge mounting screws (my RP6/RB303 arm/headshel are dead level otherwise and the 17D3's diamond cantilever and stylus were pefectly aligned), was a remarkably startling absence of bass, a tipped up treble, but a luscious midrange. Ah hah! (I said to myself). The SHTV audio mavens are not wrong. They all use a 2mm spacer with other Dynavector cartridges (most often, as I read things here, the 10X2 and 20X2). Dopey me. So I swapped a 2mm spacer in place of the 4mm thing. That resulted in a highly detailed but much smoother treble, the same luscious midrange. More bass detail appeared, but on familiar LPs (e.g., Stanley Turrentine and the 3 Sounds: Midnight Hour, Pepper Adams: Critics' Choice, and a couple of other notably well-balanced recordings) bass still sounded far back in the mix. Then I checked the Dynavector web site for the actual cartridge height. 15.8mm. So I pulled the 2mm spacer and went back to the stock mount. The treble got even better, the midrange stayed luscious, bass detail and presence was back in full force. Just as important, instrument timbre (which I did not notice being off because I was concentrating on other things) was back in full, realistic force and everything better than I've heard in a long time. I just learned (not for the first time in my life): 1. Check the actual cartridge specs before making decisions on spacers or arm height/VTA adjustment; 2. A 1.8mm cartridge height difference makes such a tiny angular change in VTA on a Rega turntable/RB303 arm combo that even when using a Dynavector 17D3 with its unusually short cantilever, adding height of any kind, even as little as 2mm, is a bad idea; 3. The Dr. Feickert Alignment Protractor is the best device of its kind I've ever used (that includes all of the various alignment tools I've used since approximately 1974); 4. The 17D3 is a wonderful cartridge.