0 Members and 1 Guest are viewing this topic. Read 13753 times.
Heck, Neo did all the real work. I just hope someone out there can correct/refine it.
Another good guide...http://www.theabsolutesound.com/articles/setting-up-a-phono-cartridge/I can personally vouch for Andre and his methodology.Jim, Dead Kenny G's link works OK for me...
I bought the Feikert Adjust + tool a couple of years ago, and I am playing with it again. It has two features of interest to me. 1. Azimuth setting. Setting the stylus on a mirror to ensure physical verticality is not enough. In the equal crosstalk method used by Feikert, to get electrical verticality, the cartridge might have to be rotated up to a couple of degrees. Each cartridge is different, even different samples of the same cartridge. From my last Adjust + session yesterday, I learned that my cartridge must be rotated counterclockwise (looking at the front) by about a degree and a half. I say "about" because the Feikert requires use of a fairly heavy calibrated longitudinal level to be placed atop the arm. This gives me two problems.: a) my tonearm (a Graham Phantom Supreme) does not have a large enough horizontal surface upon which to place it. I am going to have to jury rig something; b) the level is fairly heavy. Feikert recommends that the level be placed on the arm and the arm rotated to the next angle while the arm is in the armrest. Then the level should be removed while the next measurement is made. This is smart, because if the level falls off, it could damage the record. Also, the cantilever can't take the weight of the cartridge and level together without compensating for the extra weight, and it may be difficult to do this by adjusting the counterweight alone. In addition (I am only speculating), the arm's increased effective mass might screw up the measurements. So, removal between measurements is a good idea. To be consistent, however, the level must be placed in exactly the same position on the arm every time. This is difficult because the base of the level has no markings whatever. I am hoping to solve this problem in my jury rig.But even then, there is a problem of interpretation. Theoretically, at the optimum azimuth point, the ideal results would be maximum channel separation, zero crosstalk, and 90 degrees phase angle (whatever that means!). My cartridge is specced at 30dB of channel separation (at 1000Hz); the best I can get is 21dB. Measured phase angle is 174 degrees, not 90. Perhaps the data are accurate and it's my cartridge that is at fault. On the Feikert website there are indeed cartridges that measure 30dB and 90 degrees. Since I have not compared any of these to mine, I do not know if sonically they are any better.One blogger says that he adjusts VTA to get 90 degrees first, then proceeds to do the rest of the measurements. I tried that, but found that the phase angle varied little from 174--certainly nowhere close to 90. I am beginning to believe that it is pretty much built into the design of the cartridge. How important is it? I have no idea. 2. Arm-cartridge resonance. For years I have used the method in which a tone on a CBS test record is swept down from 100Hz almost to DC at a determined rate. At some point the needle begins a fairly violent dance. If you have timed this tone-sweep with a stopwatch, you can determine this resonance point. It will usually be between 7Hz and 20Hz? For many years, the ideal has been said to be about 11Hz--above the warp frequency (about 4Hz) and the threshhold of hearing (about 20). If it is close to 7Hz, there is little you can do about it except get a lighter cartridge or tonearm. If it is close to 20Hz, you may be able to reduce the resonance point by adding a little mass to the arm or cartridge (Blu-Tak anyone?). I am pretty happy with the sound of my system and I listen to a lot of great (mostly classical) music, but a lot of the enjoyment for me is trying to make it sound even better. This afternoon, I will be playing with a USB digital microscope to see if I can get close to the magical 92-degree SRA, and to find out if I hear any difference. I'll probably will check that with a couple of audio pals because my ears (too many years on the flight line) ain't what they useter be. Am I wrestling with problems of cosmic import? Certainly not. Am I having fun? You bet!Merry Christmas to all.
Page created in 0.064 seconds with 28 queries.