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Found 21 results

  1. Need help in making a decision. Just asking for input, and this is a very important crossroads. The FeralA filters are now 'perfect'. They work for everything presented, only 3 adjustments, and possible to bring it down to two -- both are dB type adjustments with narrow ranges. There is also the calibration for decoding itself, but that also has been generally very stable on non-normalized consumer material. Everything presented is cleanly decodeable, even the ABBA stuff, Carpenters and other previous 'problem children.' There was a discrete change which opened up the full solution. It is of similar form to the previous filter design, but a major 'hole' was patched. My reality: I recognize that I know that the audience is limited, and that not many people are truly enthusiastic, many probably not believing in the problem, even now... Should I publish the filters or not? I know that there aren't very many DolbyA decoders out there, but there are indviduals who have strong marketing/sales abilities, and I have none. It is very possible that with proper marketing support, someone could make a LOT of money on the filter designs (improved sound for everything, easy to adjust), but I also want to 'fix' the music. I really don't mind if someone makes money on this design, but it doesn't seem right that 2-3yrs (probably 8yrs total) of part time work would be monetized by someone else, without supporting the person who did the work... Note: I don't care about money -- but I do care about fairness. I like helping people, but there is a certain morality (or lack of) by some people in this world... What do I do? This is NOT rhetorical -- the filters are NOW perfect, I can create true DolbyA material from almost any pop FeralA stuff, often first iteration. Anyone could use the filters now.... John
  2. Well, the noise floor of 16-bit is -96dB (putting aside that -120dB is achievable in practice with the use of noise-shaping dither). If -96dB were 20% above the noise floor of most equipment, then most equipment would have a noise floor of -115 to -120dB (the former being 96 x 1.2 and the latter being 96 divided by 0.8). Based on measurements of a lot of equipment at sites like audioscience review, very few DACs and virtually no amplifiers are capable of -115dB and pretty much none are capable of -120. And the vast majority of amps fall short of even -96dB, while for DACs -96dB is middle of the pack.
  3. Hello, first of all, I'd like to say i'm not fluent with english so please, try be comprehensive with me ? I have 2 questions. Both of them are related to my configuration which is based on : A Raspberry PI 3 B+ (1 board) An Isolator v1.2 card (1 board) A KATANA V1.2 DAC (3 board) That makes a 5 boards stacked in the selled by Allo acrylic Case. This config is powered by 2 external power (both 5V 3A : coming from Allo's website and bought with the Katana) : 1st one directly on the Isolator card (USB-C connector) 2nd one using USB-C connector on the card on top of the set-up (SparkOS Micro Controller) There is a 8GB sd Card on which I've installed Volumio. Volumio is reading audio files from a NFS share located on a NAS. I don't have issues to read FLAC files but I can't read AAC, SACD tracks inside ISO file, DSD tracks inside ISO file, DFF files. 1- Can you explain me how can I do that please ? I also realised that when I don't play any track, it's like if there were some "wind" in the room. I mean I can hear a noise which I don't hear if I switch my amplifier on another source (like CD player, turntable or TV). 2- Do I have to check or change anything to make it work normally ? Any help will be appreciated. Thanks a lot.
  4. I've run into a new problem and didn't know if anyone had any similar experiences/solutions. Thanks in advance. I am currently using a microRendu in an area of my house that does not have (and cannot easily get) wired ethernet. I tried using it plugged into an eero base, but had some drop outs. I have been using TP-LINK AV2000 Powerline Adapter with good results. I changed up my system and with my new Wells Audio Milo I am picking up noise from the power line adapter. If I move the adapter to a different outlet than my amp is plugged in, it improves. I still have audible interference (sounds like data transmission to me) but it is better than when both are plugged into the same outlet. I have had some improvement adding a better/shielded power cable (Cardas Clear M). It's better but it is still there. If I turn off the DAC (Schiit Gugnir Multibit), the sound is still there in the background--so I think it is from the amp itself. Any suggestions? I'm looking into hardwiring the ethernet, but this will be expensive and require drywall work. I've considered the Auralic Aries, but like my microRendu. Thanks for any suggestions. Mark
  5. 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
  6. 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): [/img] 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: [/img] 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.
  7. 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...
  8. 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/
  9. 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.
  10. 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.
  11. 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
  12. We often cite common mode noise as being bad for audio, well it is but how bad is it, where the source comes from, and find a way to work around removing the source. Where noise ends up being audible is in the DAC, that's why this topic is in the DAC section of CA. DACs are very noise sensitive, and their SQ can be greatly improved by trying to remove common mode noise from the signal path and the power supply. There are quite a few good papers to grasp the concept of common mode noise. Here's three that are well written, not too much detail to be lost in the topic, but to find cures needs a little detective work, between all of us, we could find and report and publish the results. From Gryphon and Emerson. From Maxim integrated. From Pulse Electronics. The Maxim paper has drawings of cabling systems that will be familiar to CA users and where common mode noise can cause problems just from cabling. Texas Instruments have produced graphs of a few noise sources we use everyday, and effect of that noise is astounding. The papers are not too arduous to understand, but not all recommendations are accurate.... For instance, the Emerson paper recommends a UPS for common mode noise reduction, but only if there are isolation transformers fitted. Not any transformer will do, as we know, Pulse Electronics mentions on the last two pages, how common mode noise can jump transformers, and how a balanced network can cancel out common mode noise. The drawings are mainly for @Cornan to appreciate why the centre point is earthed (grounded). There's not that much in the way of reducing differential mode noise on AC networks, other than a differential choke which could be worth looking at in some detail. I wish it were easy to measure and apply an xyz and bingo it's gone. Not that simple. The best tool we have is the power of observation and listening.
  13. 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
  14. 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
  15. On thoughts of reducing RFI and EMC offenders in the home and their influence on digital audio, the victim has enough resilience to ignore that interference, but why make it easy for noise to propagate further. There are so many SMPS and RF generators in the home where will it ever stop, it's just not possible to remove them all, but at least identify them and route audio power and signal cables away from them to minimise coupling. Distance is very good, ferrites are a good weapon. Armed with a portable LW radio tuned around the 153kHz mark (the closest to the audio band as I could tune) lets set on a hunt to see which noise maker is the worst. List of items tested HP Z800 tower style workstation Lenovo mini computer i7 HP Laserjet M252 network printer Topaz 1000VA transformer TPlink 24 way network switch Generic 12V 2A SMPS Dell 24in monitor Mac mini 2010 vintage QNAP 419P NAS Asus wireless repeater Mutec MC-1.2 USB to S/PDIF converter Accuphase E-450 integrated amplifier iPhone 8 plus Based what I heard on the radio, some items were disconnected immediately. All devices were in their normal operating condition or in standby mode like the printer. Have a guess as to which devices were the worst and which were the least noisiest. No need to grade them all, just the worst or best will be fine. I was quite stunned as to which were really quiet.
  16. HI I just got allo boss kit with RPi and 5v adaptor then I setup volumio it work correctly but after I connected to amplifier there are loud noise so I cant even use it. please suggest me how to fix it. What I have done. (but noise still noticeable.) - Reboot RPi - Connect power adaptor between c-type(BOSS) and micro(RPi) - disassemble and reassemble it again. PS. I have another RPi connected to USB DAC and plugged into this amplifier has no noise at all. Thank you
  17. Hi all and @Archimago Is the issue/s that's described here by Archimago, regarding 8kHz packet noise, still an issue with mobile USB sources running off battery, like an iPhone, Android phone or mobile DAPs? i.e. USB sources not connected to mains power at all? Or is it still an issue with mobile battery based USB sources too? Cheers
  18. 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?
  19. 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?
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