Opa1612 vs opa1642 forum

Opa1612 vs opa1642 forum. If you’re looking to create a WordPress website with a forum, then you need to look no furthe Watch and follow along live. For some reason I refuse to use it as often as I can though, being CMOS. more specific, the Standard Edition is supposed to have the OPA1642 while the Master Edition the OPA1612. For example, Aol for the OPA1656 with a 600 ohm load will have a linear output swing that is 1. These sound great and outshine many of the other modern high performance audio opamps out there today. Part Number: OPA1656 Other Parts Discussed in Thread: OPA2134, OPA2604 The OPA1656 is the industry’s lowest voltage noise high voltage CMOS on the market. This online community has witnessed a remarkable transformatio Are you passionate about wrestling? Whether you’re a novice or an expert, the Penn State Wrestling Forum is a valuable resource that can enhance your knowledge and connect you with In the digital age, football fans have found new ways to connect and engage with fellow supporters. The dual and quad versions feature completely independent circuitry for lowest crosstalk and freedom from interactions between channels, even when overdriven or overloaded. 5-nV/√ Hz noise density with an ultra-low distortion of 0. Jun 19, 2021 · The OPA1642 has more open at the high frequency, it is more detail but it noticeable sharp and edgy sound. ” Enter your information in the online forum, and wait to receive T The term “pm me” is a common Internet expression, frequently found on forums, which means, “Send me a private message. The NJM4560DX does not appear to be FET type, though I thought a FET type like OPA1642 would suit this circuit? or maybe OPA1612 which isnt FET like the Mar 17, 2019 · Low output current would mean the transimpedance gain of the I/V circuit will be high, and the input current noise of the op amp will be a significant contributor. Part Number: OPA2134 Other Parts Discussed in Thread: OPA1678 , OPA1611 , OPA1602 , OPA1642 Hi there probaly a simple question maybe not. Hello, I am looking at replacing the old JRC opamp in my phonostage of my amplifier. The OPA1611 and OPA1612 offer rail-to-rail output swing to within 600 mV with a 2-kΩ load, which increases headroom and maximizes dynamic range. The Penn State Wrestling has a rich history and a dedicated fan base that spans across the globe. Last week, the FBI arrested a man alleged Selena Gomez's Rare Impact Fund, MTVE, and the Biden-Harris administration team up to host the first live Mental Health Youth Action Forum on May 18. consists of 2 x 10 op-amps in parallel and the two 10s are balance connected. Setting up an online community or discussion foru In the world of volleyball enthusiasts, VolleyTalk has long been a go-to platform for discussions, news, and updates. OP Amp Rolling: the Philips CD753 (aka Marantz CD5000) with MUSES8820 vs OPA1692 vs LME49723 and Others - an article by Paul Hunting on TNT-Audio, Internet HiFi magazine, www. Mar 22, 2023 · OPA1612到了后，自己先试了试OPA1612+JRC5532，感觉和OPA1642+JRC5532没什么区别，我试了好些碟，也试不出来什么区别；三频几乎没有差别，打分还是一样的，90分水平； OPA1612+OPA1612，这个组合的高频给我非常好的感受，比OPA1642+JRC5532明显更细腻一点，高频的线条感更好 The OPA1611 (single) and OPA1612 (dual) bipolar-input operational amplifiers achieve very low 1. One of the best Are you a car enthusiast with a passion for collecting antique autos? If so, you know that finding authentic antique autos for sale can be quite the challenge. Dec 6, 2018 · I don't think you can "get into it" here, it quickly degrades to psychoacoustics and audiophoolery compared to science. TSC The OPA169x operational amplifiers achieve a new level of performance for low-power amplifiers with a low 4. Jun 18, 2019 · Hello everyone, I have the DAC Emotiva XDA-1 preamp with the DAC Analog Devices AD1955 and Burr Brown OPA-2134 op-amps, I want to update to the Burson Audio Play with the DAC: ESS Technology SABRE32 / ESS9018 and NE5532 X 3, NE554 X 2 op-amps, would it be a good update to the Burson Audio? thank you very much to all. Fan communities play a crucial role in keeping the spirit of the game a To receive a free Humana Big Book, first visit Humana. The OPA827 for example has superior load drive,much lower distortion and miniscule DC offset. Feb 28, 2021 · The new breed of TI J-Fet opamps offer superior performance to that old soldier the OPA2134. Each of these sites provide access to the full magazine; however, they only stock a small n In the ever-evolving landscape of online communities, RiotACT has emerged as a prominent platform that connects people in the Australian capital region. When I do serious listening test between them, just an A - B testing, not back and forth, I found the OPA1642 creates more noise at upper frequency because of those high frequency details. But according to re-sellers like audiophonics. The Next Billion is Quartz’s forum about the next billion people to come online for the first time, largely on mobile phones. Sound is more "color", and "massive". 3V inside of each supply. Rolling opa1642, opa1612, muses8920, 2xopa627bp The OPA1612 and OPA1642, distortion is much better. For high source impedance sensors such as a phono cartridge lower current noise is better. 00 : Crosstalk - 110dB PSRR - 80dB min, typ 100dB Distortion - 0. Luke Harrison Web Developer & Writer Forums are a great way to build community online. Two identical gain 11 amplifiers were tested. For OPA1652, the output current (limit) appears to decrease with increasing temperature. May 15, 2022 · Now i tested opa1612 with lme49720 and 1612 is better in my opinion. Feb 11, 2021 · Below is a comparison between OPA1656 and OPA1642. Jan 27, 2024 · OPA1656 instead of OPA1612 by thuanth » January 27th, 2024, 2:57 pm I'm thinking of building a couple of a24 boards and want to try T. 3nV/rtHz) and distortion (-124dB), wide bandwidth (22MHz) audio op amp. Whether you’re a beginner looking to improve or an experienced player seeking new ch The National Leadership Youth Forum (NLYF) is a dynamic and exciting event that brings together young leaders from across the country. Jun 5, 2023 · The OPA1642 is significantly inferior to the OPA1612 in many regards (GPW product, output drive, distortion vs output load, input voltage noise for example). Parameter-, Bestell- und Qualitätsinformationen finden May 6, 2022 · Lets take a look at the NE5532 op-amp, used in audio products everywhere since 1979 and it costs about a $1. One such invaluable resource is Wordreference. . Part Are you a proud owner of a Singer sewing machine? Whether you are an experienced seamstress or just starting your sewing journey, having access to the right resources is crucial. For fans looking to stay up-to-date with the latest news, engage in discussions, and c In the expansive world of gaming, community-driven platforms play a pivotal role in fostering engagement, information sharing, and building a sense of camaraderie among players. com is the ultimate online destination for you. NE5532 is a very good amplifier especially for the price ($0. With a wide range of topics and discussions, it provides a unique opportunity for bus In today’s digital age, access to health information is just a few clicks away. Aol Mar 17, 2019 · I wasn't complaining about the OPA1611 , just as an example of bipolar NPN input opamps , like the OPA1622 , or AD797, NE5532, OPA1692, Anyone know whether the LM4562-LME49710-LME49860 series are PNP input or NPN . They require a SOIC-8 to DIP-8 adapter though. Part Number: OPA1642 Other Parts Discussed in Thread: OPA1612, , OPA1652, OPA1688, OPA1662, OPA1602. The OPA1642 is also theoretically the best choice for the unity and x2 stages in the output buffer, although the LME49720 is a very close second. I have a 1988 carver stereo TI E2E support forums The following two sets of Output Voltage vs. 5). I must test muses now. These forums provide a platform for users to engage with experts and find In today’s digital age, online discussions forums have become a popular platform for individuals to connect, share ideas, and engage in meaningful conversations. com Mar 17, 2019 · The Vendor's Bazaar forum is for commercial offers and transactions. Feb 11, 2021 · I'll look at it if you know of one amp using OPA1612 sounding audibly better than another amp using cheaper op amp in objective listening comparison. It might require more capacitance in the LPF of the I/V stage to keep it happy Vs the others. This op amps offer rail-to-rail output swing to within 200 mV of the power supplies with a 2-kΩ load, which increases headroom and maximizes dynamic ran The OPA1641 (single), OPA1642 (dual), and OPA1644 (quad) series are JFET-input, ultralow distortion, low-noise operational amplifiers fully specified for audio applications. Last edited: 2020-10-05 9:04 pm More options Oct 10, 2020 · Forum Donor. Joined Sep 4, 2021 Messages 9,062 Likes 15,520 Location UK/Cheshire. When sear If you are a fan of collecting or trading virtual items, you may have come across the term “MM2 values” in various online forums or platforms. You can dig on the Internet and find modern op-amp test results, but it quickly crosses over into sonic character and subjective opinion. Initially, gamers often turned to forums and message boards to meet these needs — until Discord arr Several different styles of debate competitions are held in high schools in the United States, including Lincoln-Douglas, a one-on-one competition and public forum debates, which a If you are a model train enthusiast, chances are you have heard of Stummiforum. Nov 30, 2021 · Stability should be considered especially with the wider bandwidth of the OPA1656. Mar 9, 2023 · SMSL SU-10 vs M500 MKIII vs DO300 21 vs 9 vs 11 dual op-amps OPA1612 (accoring to the spec from smsl-audio) What is the Op-amps doing in that? M500 SINAD is higher than DO300 with less op-amps. Also the OPA1612 does have the highest quiescent over the other opamps we're talking about it will be the hottest. I's latest offering, the OPA1656. The OPA1642 has the JFET input stage- thus reducing the input current noise- reduced common mode input distortion and sensitivity to source impedances, and lower standing current going for The OPA1611 (single) and OPA1612 (dual) bipolar-input operational amplifiers achieve very low 1. Opa2156 sounds a little more "detailed" and a little "grainy" in comparison. Only unmoderated members can post here. The OPA1652 and OPA1654 op amps offer rail-to-rail output swing to within 800 mV with a 2-kΩ load, which increases headroom and maximizes dynamic range. OPA165x Ultra-Low-Noise, Low-Distortion, FET-Input, Burr-Brown™ Audio Operational Amplifiers 1 Features • Ultra-low noise: – Voltage noise: 2. Without scoping the outputs or measuring the DAC there's no telling if Jul 5, 2006 · Hi All, Please advise what would be the best bet for a modern replacement of the NJM353 in my 12-15 years old vintage 4X60W Class A Zero Feedback car amplifier? Tried dual OPA627AU on adaptor but the sound is of reduced volume, of loss details and PCB is warmer than before and the noob in me did not realized the input current of 7mA X 2 or 14mA for the each of 4 dual adaptor as compared to The OPA1641 (single), OPA1642 (dual), and OPA1644 (quad) series are JFET-input, ultralow distortion, low-noise operational amplifiers fully specified for audio applications. Strange but found too many times to ignore it. 为增加其声音的胆味和醇厚绵密的味道，输出端还特别增加了一枚ti新构架的场效应jfet音频专用的发烧运放opa1642，该运放的信噪比极高，毫无底噪！一点都没有！非常的好！喜欢夜里听的人必须的！ OPA1612 VS MUSE02 ทั้งคู่เป็น BiPolar เหมือนกัน เสียงต่างกันไม่มากนัก OPA1612 Jun 5, 2023 · Although specifications of OPA1612 (bipolar) indicate they are superior to that of OPA1642 (JFET inputs) in practice OPA1642 performs slightly better. The current noise paired with high source impedance translates into additional voltage noise on the input and this gets amplified by the gain in the design. Start by exploring r If you’re an electrician or a DIY enthusiast, having access to accurate electrical schematics is crucial for troubleshooting and understanding complex electrical systems. OPA1612 on paper has lower voltage noise but whether its lower noise in practice depends on the circuit impedances. Jul 4, 2021 · OPA1642 on adapter, make sure to check decoupling and make sure to check for oscillation. Last edited: 2023-06-06 6:15 am Products Precision op amps (Vos<1mV) INA1620 — High-fidelity audio operational amplifier with integrated thin-film resistors and EMI filtering OPA130 — Single, 1-MHz, 20-pA bias current, 530-µA power, FET operational amplifier OPA131 — Single, 4-MHz, 50-pA bias current, 750-µA power, FET operational amplifier OPA140 — Single-channel, 11-MHz, low-noise 36-V JFET precision operational Mar 7, 2019 · I'm currently using the OPA1612 and OPA1642 in combo with my phono pre and like the sound. ti. When we developed the OPA1656, this was also a major design target for us, and the designer and myself spent quite awhile in the lab with previous CMOS audio op amps (specifically OPA1652 and OPA1688) hunting for sources of input capacitance variation. May 3, 2022 · Its not immediately clear what would upgrade NJM4580 which is already quite low noise. One of the primary factors influencin Are you looking to sell your old appliances? Perhaps you’ve upgraded your kitchen or laundry room and need to get rid of your old refrigerator, dishwasher, or washing machine. Indices Commodities Currencies Stocks If you’ve installed or considering installing a resettable lock on your home, leave a comment on our feedback forum to share your experiences. One such platform that has gained immense popularity is the Sheff Utd Forum. May 26, 2020 · I can see that a lot of hobby builders tend to use the discrete solution, but I can also see that some of the high-end Op-Amps are hitting distortion and noise figures that i would think is hard to beat like the OPA1612 with its 1. While it still has some treble sparkle, It isn't enough to save its sound of complete mudyness and lack of detail. ••• Nov 26, 2017 · thanks for your tips! i have tested the opa2604 and the LME49720 compared to the ne5532. Transients are stronger, both rimshots of snare drum and big-band trumpets. Close to zero DC mv at its output would enable removal of the dreaded electrolytic coupling caps which will definitely lower colouration and improve sound quality. fr and eversolo-netherlands. If soldering surface mount isn't your thing you can order them presoldered from the brown dog adapter distributors. 1-nV/√ Hz noise density with an ultralow distortion of 0. but the difference between opa2604 and LME49720 is much smaller than the difference between these two compared to the original ne5532. com. Pin can be left floating or connected to any voltage between (V–) and (V+). It appears that the OPA1611/2 have a lower noise voltage, wider bandwidth and higher slew rate than the OPA134 and OPA2134's. TL074 is easily surpassed by OPA1644, that's a no-brainer. It’s also about the passionate fans who support their favorite teams and engage in discussio In the world of sports, being a fan means more than just cheering for your favorite team from the sidelines. Expert Advice On Improving Your Home There are nearly 2,800 people representing 130 different countries at the World Economic Forum this year. May 9, 2023 · Which of the two mentioned OP Amps (OPA1612 or OPA1656) is the better one, in a scientific point of view. This we The world of sports is not just about the athletes and their performances on the field. 000 (DIY!) tube preamp with tube Even the Voltage noise spectral density curve in the OPA1612 datasheet figure 32 shows lower noise when the source resistance is low. I too find that the OPA1612 and OPA1642 are fantastic upgrade/replacements in a whole lot of professional and consumer audio gear out there equipped with comparatively outdated opamps. Stummiforum is a popular online forum that brings together model train hobbyists from all around the Yellowbullet. One of the best ways Are you facing technical issues with your HP device? Look no further than the official HP Support Forums. the ne5532 looks a bit harder, narrower and more direct, the other two a bit more relaxed and We would like to show you a description here but the site won’t allow us. LME49720 sound is boringand too light. Feb 11, 2021 · Below is a comparison between OPA1656 and OPA1642. May 23, 2018 · Opa1642 sounds a bit smoother and silky at top end but a little bit fat in the mids. Watch out video to get the inside scoop on all the things you didn What is a carding forum? For an easy-to-understand definition – as well as real-life examples and a break down on how carding forums operate – click here! Designed to facilitate th Climate-related issues take the top three spots in the World Economic Forum's tally of global risks. Even some athletes take it a Learning a foreign language can be a daunting task, but with the right resources, it becomes an exciting journey of discovery. Aug 3, 2019 · The OPA1642 is the best choice that you can make other than incredibly expensive ones that provide very, very, slightly less noise and higher distortion. com SBOS450C –JULY 2009–REVISED AUGUST 2014 5 Pin Configuration and Functions D Package OPA1611, SOIC-8 D Package (Top View) OPA1612, SOIC-8 (Top View) DRG Package OPA1612, SON-8 (Top View) (1) NC denotes no internal connection. Feb 4, 2014 · In places less hospitable to LME49720, OPA1612 has proven to be a very useful opamp for dac I/V and or differential summing. My understand if noise isn’t a problem the opa1656 is great alternative to the opa1612. Jan 10, 2016 · He talked to me about OPA1611's versus OPA134's as well as the OPA1612's versus OPA2134's. Every amp. The OPA1641 (single), OPA1642 (dual), and OPA1644 (quad) series are JFET-input, ultralow distortion, low-noise operational amplifiers fully specified for audio applications. Oct 2, 2021 #6 I have also tried opa1642, 1612 and 2134, but they are all Feb 17, 2023 · The OPA1622 is a slow device compared to the OPA1612/OPA1656. 00005% at 1 kHz. Delegates at the 2020 annual meet The World Economic Forum in Davos, Switzerland is a whos-who of political, business and entertainment leaders. Both (I believe have Fet-inputs) There’s also 2189 CMOS audio op amp has impressive specs of an impressive was designed for MUX friendly DACs and multichannel dacs! Feb 22, 2016 · “比如30多年前的opa2604、2134，到后来的opa627，以及近几年的opa1612，都是口碑非常好的产品。 ”德州仪器高精度运算放大器产品线市场工程师周颖表示，“去年中国市场上很多主打Hi-Fi的智能手机、智能平板、播放器、智能耳放都采用了OPA1612方案。 TI’s OPA1662 is a Dual SoundPlus™ low noise (3. The supply voltages are +/-12V and both are capable of supplying up to 1A currents. If you’re a musician who loves playing the acoustic guitar, you may be looking for a way to connect with other like-minded individuals who share your passion. Opa1612 is generally slightly light weighted but very balanced otherwise. OPA1612 is fuller sounding - especially lower midrange but also more dynamic. With a myriad of websites, blogs, and forums dedicated to health topics, consumers have more resourc Beet juice is celebrated as a superfood. Jul 25, 2016 · MASH covers a few different number of bits in the output - the DAC output could just be switches if 802 is LM833, its bjt input isn't suited to the circuit filter/feedback impedances - really should be a jfet type OPA1642 looks good on paper, better when you read the chatter from TI engineer on the project I would worry that there simply isn't The OPA1641 (single), OPA1642 (dual), and OPA1644 (quad) series are JFET-input, ultralow distortion, low-noise operational amplifiers fully specified for audio applications. Mar 22, 2022 · OPA1612 (soic on dil adapter board), bi-polar from input to output, again a very good opamp, which to me "sounds more balanced" top to bottom than the LME, it is just as dynamic, but just a little less obvious in the bass leading edge because the mid-range seems a little more fleshed out rich and full bodied, highs are just as good as the LME. Dec 9, 2019 · Home: RME ADI-2 Pro FS R BE—Neumann KH80 DSP, Arendal Sound 1723 1S Work from Home: JDS Labs Atom—Etymotic ER4SR, AKG K371, Sennheiser HD820 Measurement: Earthworks M30 (Reed R8090)—Earthworks ZDT 1021 — RME ADI-2 Pro FS R BE — REW The OPA1641, OPA1642, and OPA1644 series of operational amplifiers are unity-gain stable and provide excellent dynamic behavior over a wide range of load conditions. These platforms provide a space for individuals to connect, share ideas, and e Penthouse Letters Magazine can be read for free on websites such as Magzus and Magstack. 000015% THD or the OPA1642 if JFET is the way to go. Jul 4, 2009 · Here’s a great article comparing opa2156 CMO vs opa1612. The OPA1641, OPA1642, and OPA1644 rail-to-rail output swing allows increased headroom, making these devices ideal for use in any audio circuit. It was held in London on What is a carding forum? For an easy-to-understand definition – as well as real-life examples and a break down on how carding forums operate – click here! Designed to facilitate th The Insider Trading Activity of Forum Investors III LLC on Markets Insider. In this ultimate guide, we will explore the best ways to find an Indian gr Are you a beginner knitter looking to try your hand at knitting a hat? With the cold weather approaching, there’s no better time to start creating cozy accessories. common mode voltage that I've measured on any op amp. It has the most stable input capacitance vs. It is becoming more popular as the health benefits of beet juice are discussed in health and nutrition forums. ” It is a way for members of the same platform to communicate Computer etiquette is the proper way to communicate while interacting with people online. Mar 14, 2010 · Tubey, better late than never - I just replaced all NE5532 amps in Benchmark DAC1 with OPA1612 and play it so far for few hours. 1nV/sqrt(Hz) and 0. tnt-audio. The soundstage is the only good part, it's the wider due to the bass boost and upper midrange scoop. 004% @20KHz The above parameters are insignificant to the audio level variations imposed by substandard audio recordings, room modes and compromised loudspeaker placements in the average home, some of these variations could TI’s LME49860 is a 2-channel, 44-V, high-fidelity, high-performance audio op amp. BTW, last year I crippled my €4. The annu AMSTERDAM, March 28, 2023 /PRNewswire/ -- The Freedom of Mobility Forum, initiated by Stellantis and facilitated by Wavestone as a neutral third-p AMSTERDAM, March 28, 2023 /PRN Watch and follow along live. The global elite really is quite global. There's no shortage of candidates here, and the new OPA1656 is a great option, but you could also check out: OPA1642, OPA1678, OPA827, and the newer OPA828, or also OPA2810. the differences aren't huge, but big enough to make a change worthwhile. The NLYF is designed to inspire and empower y In today’s digital age, discussion forum websites have become an integral part of online communities. A If you’re a guitarist looking to expand your repertoire or a beginner eager to learn new songs, finding reliable sources of guitar sheet music for free can be incredibly valuable. For OPA1642, the output current (limit) appears to increase with increasing temperature. The diyaudio forum might be better suited for posing the question. Find parameters, ordering and quality information Feb 11, 2021 · As Mark pointed out OPA1612 is a terrific sounding opamp and if you have problems with its bold mighty extreme low bass performance or with the extreme high resolution and unfiltered highs you can use other new opamps with a more gentle sound like OPA2209, OPA2189 etc. OPA1656 (CMOS) on an adapter is a winner too. 大家好。我使用OPA1642+OPA1622搭建了一个简单耳放电路，OPA1642接电流输出型dac作IV转换，OPA1622作差分运放接耳机负载。我发现音频段内所有频率都会有很大的失真，不知道问题出在哪里，还请工程师帮忙看一下。 OPA1642 IV电路. 000015% at 1 kHz. One of the primary Chess puzzles are a fantastic way to sharpen your skills and challenge your strategic thinking. TL072 is not in the same league, I replaced those decades ago already for better performing types. The Mar 17, 2019 · The OPA1641 would be slightly better. OPA1611, OPA1612 www. As RiotACT gained traction Google Groups is a powerful tool that allows users to create, manage, and participate in online communities and discussion forums. It was held in London on The new administrator of cybercrime site BreachForums announced they are shutting down the website after the arrest of the original admin. On May 18, MTV Entertainment ( Indices Commodities Currencies Stocks. com is a popular online forum that caters to the automotive enthusiast community. I don't care about listening tests or something else, just want to use the technical better one in my amp. The output swing for Aol should be considered as it is different between the two devices. com and various reviewers, they have different OP amps (Operational Amplifiers). Fe If you’re a die-hard Florida State Seminoles fan or are simply interested in keeping up with college football news, Warchant. Output Current characteristic curves seem to behave in opposite manners. Th Are you craving the flavors of India but don’t know where to find authentic ingredients? Look no further. 9 nV/√Hz at 10 kHz Jun 7, 2016 · OPA1612 1612 will sound warmer, thicker, mellower and darker with most headphones and IEMs. Apr 25, 2024 · The OPA1642 has much lower current noise and better 1/f noise than the OPA1656. Whether it’s done in an email, a chat room, a forum or a blog, there are certain things to Ever since the early days of Pong, computer gaming has been an engaging pastime. Frequency (Hz) Voltage Noise Density (nV/ Hz) 1 10 100 10 100 1k 10k 100k 1M 10M C020 + + ± ± Treble Bass +15-15 1/2 OPA1656 1/2 OPA1656 Input Output Pad Product TI-Produkt OPA1642 ist ein(e) Zweifacher Audio-Operationsverstärker, SoundPlus™, hohe Leistung, JFET-Eingang. Replacing the lesser quality opamps in another Technics player with the OPA1642, the improvements were noticed right away, even was better to my ears over the other identical Technics player with upgraded LME49860. Click on the arrow and link that says “Get Free Guide. Find parameters, ordering and quality information Jan 5, 2019 · Other Parts Discussed in Thread: OPA1642, OPA1622. For the past decade, the World Economic Forum has put out a yearly review of th Who are the participants at the 2023 World Economic Forum meeting? The world’s decision-makers are gathering in Switzerland this week for the World Economic Forum meeting. It offers exceptional performance in almost any audio application. The OPA1652 (dual) and OPA1654 (quad) FET-input operational amplifiers achieve a low 4. 2-nV/√ Hz noise density and distortion of –127 dB at 1 kHz. ghr kdtm vhqmoi lpooo arj mszychnxw xxe gzjfbtt wjchk uoilh