Hi, that could possibly be because
1. You have already had a big difference. Have you tried to take out the ultra from under your pre, then check of ultra under dac is more dramatic?
2. Because the dac is lighter, and smaller, than the pre? The Shun mook guy would recommend the mini resonators for something this light
You could
1. Compare under your power with and without SRA. Let us know how it compares to the SRA too.
2. When you try different positions under the dac, you could have two in the front, one at the back, and then one in the front, two at the back. You can try to push them out to the corners and the edge, it's ok if part of them pops out, it is not required all stays under the chassis.
1. You have already had a big difference. Have you tried to take out the ultra from under your pre, then check of ultra under dac is more dramatic?
2. Because the dac is lighter, and smaller, than the pre? The Shun mook guy would recommend the mini resonators for something this light
You could
1. Compare under your power with and without SRA. Let us know how it compares to the SRA too.
2. When you try different positions under the dac, you could have two in the front, one at the back, and then one in the front, two at the back. You can try to push them out to the corners and the edge, it's ok if part of them pops out, it is not required all stays under the chassis.