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Found 22 results

  1. I have a question for all of you wizards out there. (I didn't see a more appropriate area of the forum for A/C power discussion, so I am posting here.) I have suspicion that voltage drops / brownouts have caused some havoc on our home-automation control system (Crestron). I am currently researching power conditioners, regenerators, UPS, etc. Even within the confusing, subjective world of audio, this area seems like a particularly dark black hole. Question: Does anyone know of a device or tool which can be used to monitor a home’s electrical system? I am envisioning a
  2. 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 opene
  3. 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
  4. 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
  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. 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...
  7. 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 so
  8. 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 int
  9. 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 speaker
  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 h
  11. 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
  12. 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)
  13. 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 cu
  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. 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 quie
  16. 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 u
  17. 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 sor
  18. 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
  19. 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
  20. 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
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