It’s one of the tweaks from master @Vmax! It’s a 3/4” wide 3M 7050 tape cut from a absorbent sheet. The ring works the best on power cords. It does not work on IC/SP in my experience, but I like it on HDMI cable for I2S connections.
1 Like
Our MK2 shipped yesterday. I have a pair of Nickel transformers waiting 
2 Likes
you going to break it in and listen to get baseline first? it does take a long time to break in.
1 Like
Hmm, so mine should be shipping soon (hopefully).
3 Likes
Yes.
We already did a MK2 nickel transformer swap last month to a unit that had over 500 hours on it so we know what to listen for.
2 Likes
Mine as well. Good news.
2 Likes
How did you get it to stick? I tried and it just opens up
I seem to remember some painters tape in some of the pics. I was thinking about using cable velcro straps so I can tighten or loosen when needed.
2 Likes
Painter tape works great, you can use any tape actually. I use a clip sometime so I can adjust the sizing easier.
1 Like
This cohesive bandage tape works well. Discovered after my latest knee surgery.
You can also use Sorbothane sheet between cable and tuning ring. Is also useful with a support underneath. This also acoustic vibration damps the cable and you get two VMax tweaks with one stone.
https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=6421
2 Likes
If you just want to order one sorbothane sheet. Amazon has it around $30 (6x12) including shipping. For larger quantity thorlabs is the place to go.
Just make sure it is 70 durometer or it will not address bass properly. If too soft it will not tighten bass only loosen it up.
1 Like
That is correct, Duro70 is the sweet spot.
1 Like
Taking baseline measurements of the new MK2 with the AP.
Distortion measures better than what PS Audio specification states on their website.
EDIT: Sorry… it is in fact 0.1%. Same as spec.
2 Likes
To what measurements do you refer?
From PS Audio’s web site as stated above.
Actually the frequency response is not correct. It’s actually down 0.6dB at 20khz not .25dB as stated in the spec. This agrees with our measurements of the Edcor XS4400 in 1:2 mode.
Distortion is 0.04% @ 1K full bandwidth instead of the 0.1% stated in the spec.
EDIT: Sorry… it is in fact 0.1%. Same as spec.
Specifications
| #### Physical | |
|---|---|
| Unit Weight | 21 lbs [9.53 kg] |
| Unit Dimensions | 14” x 17” x 4” [ 36cm x 43cm x 10cm] |
| Shipping Weight | 30 lbs [13.6 kg] |
| Shipping Dimensions | 20.5”x 24” x 10” [52cm x 61cm x 25cm] |
| #### Power requirements | |
| Input Power | Model specific 100VAC, 120VAC, or 230VAC 50 or 60Hz |
| Power Consumption | 25W |
| #### Digital audio inputs | I2S (2), Coax, XLR Balanced (2), Optical, USB |
| #### Sample Rates | Optical (TOSLink): PCM 16 and 24 bits at 44.1kHz, 48kHz, 88.2kHz and 96kHz |
S/PDIF (Coax and XLR): PCM 16 and 24 bits at 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz and 192kHz
DoP64 Dual XLR: PCM 16 and 24 bits at 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz, 192kHz and 352.8kHz
DoP64 and DoP128 I2S: PCM 16 and 24 bits at 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz, 192kHz, 352.8kHz, and 705.6
DoP64, DoP128, DoP256, DSD64, DSD128, and DSD256 USB: PCM 16 and 24 bits at 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz, 192kHz, 352.8kHz, and 705.6, DoP64, DoP128, DoP256, DSD64, DSD128, and DSD256|
|#### Analog Audio Output||
|Connector|RCA single ended or balanced, XLR balanced|
|Output level high, maximum|4 VRMS Balanced
2 VRMS Single Ended|
|Output Impedance|<100Ω/<200Ω|
|Frequency Response|20-20KHz +/- 0.25dB|
|THD+N @ 1KHz (full scale)|<0.1%|
|Output Stage|Passive audio transformer, fed by high current, high speed analog amps producing double rate DSD|
|#### Data Handling||
|Format|PCM or DSD|
|Sample rate (PCM)|44.1kHz, 48.0kHz, 88.2kHz, 96.0kHz, 176.4kHz, 192kHz, 352.8kHz; 705.6kHz|
|Word length (PCM)|16b, 18b, 20b, 24b|
|Data rate (DSD)|Standard (2.8MHz) or Double (5.6MHz) DoP as well as raw DSD on I2S and USB inputs|
|Input jitter reduction|effectively 100%, residual immeasurable. No input PLLs, FLLs.|
|Input Processing|225.792MHz|
|Signal Processing|56.448MHz|
|Synchronous Upsampling, all inputs|56.448MHz for 48k, 96k or 192k; 11.2896MHz for all others|
|Digital Processing S/N ratio|Upsampling > 210dB, volume control and Sigma Delta Modulator: > 330dB|
|Digital Volume Control|Zero loss of precision|
|Analog Conversion method|low pass filter DSD256 (quad rate DSD: single bit DSD at 11.2896MHz)|
|#### I2S Digital Input||
|Connector|HDMI|
|Format|PCM or DSD. DoP on all inputs as well as raw DSD on I2S inputs|
|#### USB Digital Input||
|Connector|USB “B” Type|
|Format|PCM, DoP v1.1 (DSD over PCM), or Native DSD|
|Transfer mode|Asynchronous|
It is what you are finding with your measurements which is of interest.
Sorry, I misunderstood.
Actually the frequency response is not correct. It’s actually down 0.6dB at 20khz not .25dB as stated in the spec. and down 1.2dB @ 30khz. This agrees with our measurements of the Edcor XS4400 in 1:2 mode.
Distortion is 0.04% @ 1K full bandwidth instead of the 0.1% stated in the spec.
EDIT: Sorry… it is in fact 0.1%. Same as spec.
1 Like
I wonder how PSA measured the frequency response? 
Same way we do. With an Audio Precision.