What Raul says is correct. Moving the mass further from the pivot point increases the inertia of the tonearm. The Effective Mass calculation for your tonearm actually is based on inertia. So as you changed the tonearm mass in order to move the weight further out, you were changing the Fn, resonance frequency of your cartridge/tonearm system; just as Raul stated. The ideal range is around about 10 Hz. I had the Denon cartridge on my SME tonearm for a time. I had to add some weight to the headshell in order to lower my system Fn. The Denon was relatively light and the compliance put my system Fn out around 16Hz, as I recall. The tonearm was moving up and down and would even skip if the record had a slight rise/fall to it. I found a place in England on the web that sells headshell weights specifically for the Denon cartridge. It worked out nicely for me.
Best Counterweight Position?
Some might say "At the opposite end from the head shell" :-)
But how can you be sure if the position that gives you the correct stylus pressure is the best position for your cartridge?
What I recently discovered on my setup is the further back I placed the weight the more lateral resistance was applied to the cartridge, changing the sound for the better.
To accomplish this required me to change the effective mass of the tone arm - several times.
One very simple way to accomplish this was to remove a piece of the outer cable insulation from a thick mains cable. Making a cut down the length of the sleeve allowed me to place it on the arm near the cartridge and the sleeve gripped the arm without allowing any movement.
I then proceeded to recalibrate the tracking force by repositioning the weight more towards the rear of the arm - away from the pivot point
The first attempt made the sound bloated and displayed some nasty effects, so I simply cut off a piece of the Insulation and recalibrated the tracking force.
Once the best sound is achieved you can then make the adjustment permanent by adding a headshell weight that results in the counterweight being placed in the same distance from the pivot point of the arm.
The head shell weight I started with matched the weight of the insulation and then did some fine tuning to get the weight into the correct position.
Now, there are some that will point out that this will change the effective mass of the arm and may upset the delicate balance of tone arm/cartridge compliance matching.
Well, that is true if the cartridge is matched "exactly" to the tone arm, fact is there is most always a fair bit of latitude in this area, allowing for some room for improvement.
If you are of the belief that the effective mass of the arm should not be changed, then, using a lighter counter balance weight will allow you to place it further back.
In my case I have a Rega RB250 and a Denon DL103, which is not "the best" match, but by adding some mass to the tone arm this cartridge really performs extremely well and brought the compliance/tone arm match closer to the recommended settings.
Yes, the compliance match is one reason for the better sound, but getting the counter weight further from the pivot point also made the DL103 perform much better IMHO :-)
What improvements did I notice - much smoother reproduction in the high frequencies, more texture in the bass frequencies, improved imaging and bigger sound.
Cost - just some of my time and the headshell weight, about $10.
Something to try on those cold winter nights :-)
But how can you be sure if the position that gives you the correct stylus pressure is the best position for your cartridge?
What I recently discovered on my setup is the further back I placed the weight the more lateral resistance was applied to the cartridge, changing the sound for the better.
To accomplish this required me to change the effective mass of the tone arm - several times.
One very simple way to accomplish this was to remove a piece of the outer cable insulation from a thick mains cable. Making a cut down the length of the sleeve allowed me to place it on the arm near the cartridge and the sleeve gripped the arm without allowing any movement.
I then proceeded to recalibrate the tracking force by repositioning the weight more towards the rear of the arm - away from the pivot point
The first attempt made the sound bloated and displayed some nasty effects, so I simply cut off a piece of the Insulation and recalibrated the tracking force.
Once the best sound is achieved you can then make the adjustment permanent by adding a headshell weight that results in the counterweight being placed in the same distance from the pivot point of the arm.
The head shell weight I started with matched the weight of the insulation and then did some fine tuning to get the weight into the correct position.
Now, there are some that will point out that this will change the effective mass of the arm and may upset the delicate balance of tone arm/cartridge compliance matching.
Well, that is true if the cartridge is matched "exactly" to the tone arm, fact is there is most always a fair bit of latitude in this area, allowing for some room for improvement.
If you are of the belief that the effective mass of the arm should not be changed, then, using a lighter counter balance weight will allow you to place it further back.
In my case I have a Rega RB250 and a Denon DL103, which is not "the best" match, but by adding some mass to the tone arm this cartridge really performs extremely well and brought the compliance/tone arm match closer to the recommended settings.
Yes, the compliance match is one reason for the better sound, but getting the counter weight further from the pivot point also made the DL103 perform much better IMHO :-)
What improvements did I notice - much smoother reproduction in the high frequencies, more texture in the bass frequencies, improved imaging and bigger sound.
Cost - just some of my time and the headshell weight, about $10.
Something to try on those cold winter nights :-)
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- 13 posts total
- 13 posts total