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General Audio / Re: Advice on transformer hum
Last post by Atmasphere -

I think that it is the smaller transformer which I had identified above that is making the noise. I tried prodding it with a rod and also unscrewing it altogether and placing a bit of rubber underneath it though that didn't really seem to help.

Have you contacted the manufacturer regarding this issue?

Yes, I actually sent the unit back to the manufacturer for testing, and there was no hum evident there. I am going to take the DAC to a music shop or 2 this coming weekend to see if it hums there.

It does sound like the problem is line related.

If you reinstalled the mounting screws, they would have transmitted the vibration past the rubber pad.

My suggestion would be to isometrically mount the noisy transformer. If it employs mounting screws, obtain some rubber grommets from the hardware store. Grommets have 4 dimensions- the inner diameter that accepts the mounting screw, the overall outer diameter, the hole size in which it fits, and the material thickness that it can accommodate.

You will need some longer mounting screws as well as 2 washers for each screw and a self locking nut for each screw.

Select a grommet, you don't need a big one, maybe the outside diameter might be 1.5cm. Measure the hole size it needs and select a drill that is the same diameter. You will use this drill to drill out the mounting holes in the chassis for the transformer (assuming there is room; the examples that I have seen do have room). Having done that, install the grommets. Install a washer on a screw, feed the screw through the grommet from below, install the second washer on top, so it is between the grommet and transformer resting on top, then install the self locking nut to hold the transformer in place. You don't want it particularly tight, but it should be snug. Do this for the other mounting screw as well.

If this is done right, the transformer will be mechanically isolated from it mounting and thus unable to transmit vibration to the chassis.
Audio Hardware / Electrostatic speaker myths
Last post by Nichttaub -
I just did an exhaustive search of the web for any sort of hard science on electrostatic speakers, and except for a few blogs of variable quality, the only thing I consistently hit was an advertising blurb from Martin-Logan.  For obvious reasons, I don't think their take on the subject is unbiased.

What I'm curious about is whether there has been a decent write-up anywhere talking about some of the claims made about electrostatics, and any basis in fact associated with those claims.  One thing which comes up with maddening regularity is the so-called "massless" nature of the driver.  Obviously, this is pure hype because even the thinnest, most flimsy LDPE or Mylar films have a density of tens to hundreds of times that of normal atmospheric air.  Combined with the fact that the force behind the ESL "motor" is lower than that of a typical electrodynamic driver, some of the claims about the system seem questionable.  There's no doubt that a good speaker can be made with the technology, but the hype seems to over-reach the actuality.

It seems that so many people repeat the myths, any research, design or evaluation information has been buried under them.  Does anyone know of a good unbiased treatise on electrostatics which addresses some of the pros as well as cons of the type, and backs them up with measurements and logic?
3rd Party Plugins - (fb2k) / Re: Secret Rabbit Code resampler
Last post by Case -
Rollin's post about resampling ruining gaplessness has been bothering me ever since reading it. I implemented the extrapolation used in Vorbis and Opus to SRC resampler v1.0.2 and it appears to perform quite well. At least those sample files from the linked post can be resampled without glitches.

Edit: added two comparison screenshots of the transition position. One is resampled with SoX using hiqhest quality and the other one is SRC with extrapolation.
ok, i have tested again (flac image this time) and set libflac encoder + decoder and the result is still accurate.
no, i have tested the encoders. no differences between libflac and cuetools on my side. btw it was a wav image that i had split up. my mistake.
Support - (fb2k) / [1.4 b3]
Last post by eagleray -
in the preferences pane there is a setting for network.  What does this do and how do I use it?  Sorry if I seem a bit clueless.
Since the last windows 10 feature update WASAPI event has been broken.  I have a Grace M9xx DAC.  WASAPI push works.
Uploads - (fb2k) / Re: Resampler-V
Last post by valer_valer -
Version v3.2

* Added resampling table - to config an individual parameters for each samplerate.
** A brief description of the functionality as follows:
1. After selecting Source and Target samplerates, the resampler suggests the optimal configuration. In most cases this is the best choise.
2. The graphs always shows the current selection. [when both samplerates combos have a value or table row selected].
3. During the playback the table is locked, and the controls is enabled only if there is a relevant samperate in the table [i.e. current conversion is defined].
4. The Link checkbox is for proportional aliasing (about -6dB in the Nyquist).
5. Also added Bypass, for quick and easy comparison.

Enjoy ...
A word of warning to those using CUETools 2.1.6 on linux (WINE): Do not use the libFLAC decoder! For some reason, it doesn't produce valid output. The audio checksum differs on every decoding attempt (verify/encode), and of course no accurateRip/CTDB match is possible.
sanskrit44, did you test using the libFLAC decoder? (I haven't tested myself, just looking for more information)

3rd Party Plugins - (fb2k) / Re: foo_wave_seekbar
Last post by GoaLitiuM -
I've had this stuttering ever since Windows 8 days, and it seems to only happen with multiple monitors both running at different refresh rates. Running a game in windowed mode with framerate capped at refreshrate, or moving a window around is how I usually spot the stuttering.

I personally don't care how smoothly the seekbar moves, most of the time I have foobar open it's open in my other screen and without any focus on it. The slow update rate of ~5Hz or so should be enough to mitigate the issue at least for me.