Ikeda IT-407 tonearm geometry


I’ve read all there is to read on this subject and never got satisfaction. It inspired me to ask this question earlier.
“Cartridge alignment with non slotted headshells”. 
The main reason I have a problem with these headshells is with my Ikeda it407 (chrome) tonearm, the cartridge must be twisted quite a bit in towards centre.  I have a vintage audio technica headshell with fixed holes and I don't even need a protractor to see that it won’t work. I don’t think stevenson alignment is this bad? I don't have a protractor with stevenson. My pivot to spindle distance is set perfect using my smartractor. I’m quite sure it is not possible to use an spu headshell in my Ikeda with the tonearm at the recommended distance without being seriously out of alignment. I’ve researched this online and I’ve spoken to Bill Demars at Beauty of Sound.  He said that the recommended pivot to spindle distance is probably wrong and some people position at a further distance. He agreed about spu in spu headshell in the ikeda arm not being ideal. I’ve never heard if anyone has asked Ikeda these questions about their arm. 


I do really like this arm, the way it sounds and the fact that is has a removable headshell, 
I’d just like to have better understanding of it? 



sdrsdrsdr

Showing 1 response by edgewear

Perhaps I’m an idiot with tin ears, but in my experience the sonic differences between the various alignment geometries shouldn’t be exaggerated. I use FR 64s and 64fx tonearms with the specified P2S distance of 230mm, which means that the geometry is Stevenson by default. This way I can use my FR7 and SPU cartridges with correct alignment. On my Audiocraft AC-4400, using a variety of cartridges in a variety of headshells (slotted or otherwise) I have experimented with the other geometries, including Audiocraft’s own (which is neither Baerwald, nor Löfgren, nor Stevenson).

The sonic difference between these various geometries was so negligable in my system and to my ears, that I decided to use Stevenson for the Audiocraft as well. This way I can use my cartridges in all three arms, without having to make changes to their position in the headshell each time they go from one arm to the next. Yep, I’m a lazy idiot as well.

In my own defense I should probably add that my Reed 3P tonearm with fixed headshell uses the Baerwald geometry. As much as I’ve tried, I’ve never been able to conclude that this set up sounds superior in any way to the others. If anything, I’d say Stevenson is preferable with classical music, as these composer guys like to go out with a bang. You may have noticed this usually happens at the end of the record side, where inner groove distortion is likely to be most severe.