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Found 12 results

  1. Every PSU kicks some noise back into the AC line, which may have an influence on the rest of your gear connected to the same AC line. I still remember a review written by Martin Colloms of some gear using onboard SMPS, where he claimed that simply connecting said component (otherwise not connected to the system) to AC line, made his system sound considerably worse. So how bad is the problem ? Having bought a wideband AlphaLab EMI Power Line Noise Meter I decided check that out on various PSUs I had on hand. The setup To get a reference/base noise level I have used my old and trusty Audio Power Industries Power Wedge Ultra 215 power conditioner, which I normally use to 'sink' all of my computer related PSUs - main server PSU, SSD battery SMPS charger, UpTone Audio JS-2 powering two LPS-1 PSUs and a computer monitor. The noise level measured at the output was just 23mV. I have used one of outputs to connect a simple power strip (with no filtering): The PSU under test was connected to the same power strip, next to the EMI meter: I had 8 different PSUs on hand: 3 linear ones and 5 SMPS (switch mode) types: 1. Teddy Pardo linear PSU 2. UpTone JS-2 linear PSU 3. SOtM supplied SMPS (PowerTek) 4. Meanwell SMPS (supplied by UpTone with Regen and LPS-1) 5. Some generic linear PSU I found lying around 6. Ktec SMPS that I got with an external HDD 7. iFi iPower SMPS 8 Co Ming Data SMPS Since I have observed the level of noise beeing kicked back to the AC line varies with PSU load, I have measeured those PSUs in the following conditions: 1. Idle - PSU connected to the power strip, but nothing connected to the PSU (no load) 2. Noise under light load - PSU powering Regen, which in turn was powering AQ DragonFly DAC 3. Noise under moderate load - PSU powering SOtM sMS-200 4. Noise under heavy load - PSU powering the LPS-1 Ultracapacitor PSU, which in turn was powering the SOtM sMS-200. The results I got are as follows (green = best case; red = worst case): Please note that the smallest, generic linear PSU (last column) was not tested with LPS-1, since its power rating was too small. Some things I have noticed: The SMPSu in general injected much more noise than linear ones. Even the cheapest generic wall wart linear PSU was better than the best SMPS. In many cases, the noise figures dropped at idle a few mV below the reference level. It is my understanding that this is due to filtering built at the input of those PSUs, which interacts / lowers the noise on the AC line. The PSU noise readings were jumping up and down when the LPS-1 PSU was connected (chence the results are in ranges). You can see this on a short video I uploaded on youtube. It is my understanding that noise spikes were caused by the LPS-1 bulit in (capacitor) charger - when the charger was running, the noise was higher; when the charger was idling, the noise was lower. I'm not sure if higher noise readings are caused by higher current draw or the noise is comes from the LPS-1 charger itself. Whatever the reason - some PSUs were much more sensitive to that than the other. For kicks, I have also measured several other PSUs and even light bulbs: - iPhone, iPad and MacBook chargers are pretty harmless when at idle. I wouldn't want to have one connected to my powerstrip when charging though (all of you using MacBooks and other laptops connected to your system take note). - CFL light bulbs (and LEDs) are huge noise generators (unlike regular light bulbs, which generate close to zero noise). - chineese iPhone charger knock off from ebay, creates some absurd amounts of noise - many times more than the original Apple accessory (one more reason not to buy knock offs). - TeraDak linear ATX PSU that powers my CAPS v4 Pipeline server generate generates only 48mV of noise - suprisingly litte. Final notes: If you have lots of those generic SMPS around your audio system (powering DACs, HUBs, routers, external HDDs etc), it probably makes sense to replace them with something designed with the AC noise pollution in mind, like the $49 iFi iPower SMPS for example. Linear still seems to work best though. Having said that, please remember, that the best PSU is not necessarily the one which kicks the least amount of noise back into the AC line. The best PSU is the one that has low AC noise footprint and offers stellar DC output performance.
  2. Hi everyone, My basic setup is as follows: Custom built PC with both USB + OPTICAL outs > Arcam rPAC (with an unbalanced RCA passive volume control) > KRK VXT6 active monitors + 10s subwoofer I want to replace my Arcam rPAC and the unbalanced volume control with a DAC which has: balanced XLR outputs, a volume control and optical input. (budget around £350/$500) I'm hoping this will eliminate the noise issue I've been having for ages now. And yes, I've tried endlessly to fix that other ways but to no avail. One I've been looking at is the Matrix Mini-I Pro, however I haven't been able to find any retailers here in the UK which sell it. Any suggestions are very much appreciated! Thanks all.
  3. I've searched around a bit and haven't found a thread that's directly on topic, so: I have a Slim Devices Transporter (two actually), and alternate between LMS and Roon. my server for both is a late model mac mini. music library is a 3TB drive, directly attached to the mini via USB 3.0. Lately I've had a problem with network noise, and have tried a variety of solutions, including optical links, to eliminate it. the cause does not appear to any one thing, so i'm looking at everything. Has compared a directly attached USB drive to the same via Thunderbolt? looking at noise and sound quality. similarly, has anyone experienced a difference between directly attached storage and a NAS, when used in a streaming set up? again, focused on sound quality/noise. thanks/
  4. hello folks, if you use any of the P1FI DAC boards with switchmode supply, 5 x 10 mm black unit, read this link, and cry.. well it ends good, it ends with a solution.. P1FI DAC, I2S, random audio clicks ?(SOLVED READ) : Raspberry Pi • RuneAudio Forum
  5. Hi guys, does cutting a 5v line on a usb cable work as a noise isolator? To begin with here is my audio chain. Computer - Usb port - Musical fidelity Async M1 Dac - Emotiva mini X amp - Hifiman He-500 headphones (speaker taps) Computer - Usb port - Musical fidelity Async M1 Dac - Stereo Out - Active Yamaha Hs80m Speakers I play Flac/Wav music, minimum 16bit 44.1kHz using jriver 19, Wasapi, Full volume, nothing in the dsp chain - cleanest possible. I own a Musical Fidelity M1 Dac, which offers async usb, but not galvanic usb isolation as we all know this can lead to all sorts of noise problems. It's self powered so I believe doesn't require power via the 5v of a usb cable. I tried playing back and forth with optical and Usb to see if there was any difference, as it's an headache to know you've paid lots of money to have a degraded experience, especially when there's talk of improvements such as isolating Usb etc. Trying both out with Jriver. Optical was connected via a Titanium Hd soundcard, no motherboard connection. Optical seemed to offer a faster attack and delay to percussion type instruments, like a sparkly finish to the sound, yet vocals seemed slightly recessed. Usb brings the Vocals more into play, they are more pronounced and focused, easier to concentrate on, and more analogue/warm , but the other sounds are slightly blurred, i can't hear that slight reverb finish at the end of a sound, its almost as if it has been cut off! Both have their flaws. I conducted a test. If I stick some electrical tape over the 5v pin on the A connector of the Usb cable, and play with the Dac connected via Usb, switched to Usb mode only, the sound seems to be more crisper. To define crisp.. If a percussion is playing , its attack is faster and there is no blur to it, i can pick it out among the sound in its own little space. It's not just percussion, it makes each sound a little easier to identify, more spaced out, but the soundstage hasn't changed at all. I hope this isn't placebo as I haven't got any monitoring equipment to measure the difference. The thing is, I would rather use an isolator to do this as there is a slight issue with covering up the 5v pin. A sine wave is introduced into the sound if I plug in speakers to my wall outlet. The speakers are connected to the Dac also, but the Xlr have had their ground pins cut. So why not removed the tape with the speakers plugged in? I did. And the sound via usb lost its crisp edge again. Any truth to this or is my mind playing tricks? Will a Usb isolator do the same as stopping the 5v from a computer touching the signal?
  6. Setup Source: Mac Mini i7 2.6ghz 2012 Decible 1.2.8 and Amarra 2.4.1 Dac: Via USB (old printer cable - new one in the post to try as I don't think this will cause this) Nad M51. Amps: Rotel RHA-10 Rotel RHB-10x2 Bi-amped Music: 96khz/24 bit flacs, 192khz/24 flacs, and standard rips. Problem: Playback at 96khz/24 bit is perfect but when I play or set the output to anything above, 176khz or 192khz I get a high pitch tone constantly in the back ground. It does not change with volume, just the frequency increasing. I am think it may also be there at 96khz but very quiet. My thoughts are that it could be a earthing issue? Doubt it would be cable interference? or poor quality of cable as it is from an old printer. Would it be safe in thinking that changing the frequency output, can alter the sound level of a earth loops noise?????? I tried different software, Amarra was hopeless at managing the outputs, but both made not difference to the "digital noise/earth hum???" Anyone had similar issues? Cheers Harley
  7. Having just seen a couple of post recently about USB regenerators/filters, I was wondering (and hopeful) that I could use one of these such products (see link & attached pics below for examples) for an ADC audio interface. Now the interface in question is a Propellerheads Balance, which is designed primary for recording instruments such as electric guitar or Mic input via XLR. Now, my use case is slightly different but no less valid. I have a DJ mixer to which I connect a Technics SL1210 turntable and use this setup for digitising my vinyl collection at 24bit/96khz. There is a lot of noise in this setup which I am hoping to be able to reduce. This is not my end game set up; I intend to buy an audiophile turntable and phono stage (more research required before I'll commit my cash), but in the mean time, I would like some help reducing the noise I'm experiencing. I am using Propellerheads Reason as the DAW for recording and editing the audio, and it has a rather useful level meter. When all kit is connected but no audio playing, the meter is showing the noise floor is at around -60db, which is far too high. I think that most of this noise is coming from the analogue input via XLR from the mixer/phono stage; but I'm not sure how much of this is due to unpurified/unfiltered power supply going to mixer/phono stage and the turntable. Sellers of USB regenerators/filters would say that noise from host computer will infect any attached USB audio devices, but is this the case for ADC devices? Actually, the Propellerhead Balance is a DAC and ADC, but the usage scenario I'm focusing on is the ADC function. So can these type of USB purifiers/regenerators/filter devices help to reduce noise in this situation? (please see this link for device examples [ps, not the audio interface]: A Collection of USB Audio Enhancement Products | AudioStream ) Thanks.
  8. Hi all, I'm aware there have been other threads on this but have already tried other 'solutions' but to no avail so I thought I'd start my own thread specific to me. I'm getting noise coming through my speakers and I think it must be EMI/RFI as the noise is related to activities like moving my mouse. My PC is custom built with a very small case, which I fear might be the problem with all the components packed close together but I could be wrong of course. See parts list here. My DAC is an Arcam rPAC and I have an unbalanced passive volume control between the rPAC and my speakers (KRK VXT6 monitors w. KRK 10s sub). All I have connected to the PC is a keyboard, mouse, webcam and the DAC of course. The noise seems to be worst when the passive volume control is around the middle for some reason. After doing my own research, I think getting a USB isolator might be the best choice but before buying it, I'd appreciate anyone's input who has had experience with these! Pretty simple set up. Hopefully someone can help me out
  9. My setup works great for a few albums, then (always at the beginning of a new album) a crackling noise appears during playback. System: MacPro, Lynx AES16e, and Alpha DAC. After having a system crash a few weeks ago, I upgraded to IOS 10.10.1, iTunes12.0.1.26, and Amarra 3.0.3. Also upgraded to latest Lynx firmware. Any help with this is greatly appreciated. Thanks
  10. I installed a Gustard spdif converter yesterday replacing the original V-Link which topped out at 24/96. I am now hearing mild static at 192hz but not at 44,88,96, or 176.4. The problem is I cannot tell if it is from my MF M1 DAC which I never used at 192hz, or the Gustard. Everything sounds remarkable at anything but 192hz. If I use Audirvana to restrict the signal to 176.4 the noise disappears. Any ideas? I don't have an additional DAC...
  11. Hi, I am new on this forum, despite having been an enthuthiastic, albeit irregular, reader here for years. The reason why I have just registered is that I have a problem that I very much hope that some of the wise and helpful members here can help me find the solution to... My problem consists in noise on several of my ripped cd albums - but not all, despite the fact that all of my rips are being done on the same computer with the same optical drive, same software (EAC + JRiver) and all cables etc. being the same as well. Personally I find it most likely that the noise comes from my external, USB-powered, Asus Blu-Ray slim-line combo drive (SBC-06D2XU), but I am by no means certain, so that is what I hope that you will help me to determine. The Asus drive is only slightly more than half a year old, yet it does often make quite a bit of noise when in use, and its vibrations are furthermore easily heard and felt on the desk, and this has been so ever since the day I bought it, although I did not give it much consideration back then, especially since I did not have any decent computer audio equipment until recently. The other parts of my system consist of a Violectric V800 DAC + Violectric V200 head-amp + Audeze LCD2.v2. and Musical Fidelity X-T100 integrated amp + Dali Menuet speakers, all placed on my desktop with what I consider to be more than decent cabling (from van den Hul and AudioQuest among others). If it most likely is my drive that is at fault, then I am considering buying the following drive from Buffalo as a replacement, and I would naturally be very grateful for any informed or reasoned comment on whether it is likely to be a better drive than the one I have and solve my noise problems (my main reason for selecting this one is that it looks like a sturdy build, it has an external power supply and it has a USB 3.0 connection, but I do not have a chance to test the drive before making the purchase): http://www.amazon.de/gp/product/B00BQTJ1DQ/ref=s9_psimh_gw_p147_d0_i1?pf_rd_m=A3JWKAKR8XB7XF&pf_rd_s=center-2&pf_rd_r=1KRZF4554QEA92T0K416&pf_rd_t=101&pf_rd_p=455353687&pf_rd_i=301128 Any thoughts?
  12. http://www.usb.org/developers/whitepapers/327216.pdf