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  • Honey, I Shrunk the Headphone Amp


    Size, great power output, long lasting, easy to use


    nothing included to help attach this to your source


    Thanks to Dan at Periodic Audio for arranging a sample of the Nickel for the purposes of this review. The thoughts here are my own subjective opinions based on time spent listening to the Nickel. They do not represent Periodic Audio or any other entity. I have no affiliation with Periodic Audio and am in no way connected with the company.


    I have been an avid listener of music for a very long time. Throughout my years of acquiring stuff, I feel that I have gained an understanding of the synergy between the music and the hardware that presents it to us. I love gear and, more importantly, the music.

    This review will not be encumbered with specs and charts. I wanted to disclose what I heard and how I used it by the seat-of-my-pants (which is how I think many of us get to know what we like and dislike).

    The Periodic Audio Nickel amplifier is a small portable headphone amp. It is about the size of a 9V battery but weighs a fraction of it. Three ports ( 3.5mm input/output and a micro USB B charging port) and an indicator light that shows power status and battery charge capacity adorn front and back. There are no volume or power on controls (more on that later). It is super-lightweight and made from a polycarbonate material.

    The name harkens to the rest of their product line, items named after periodic elements: Beryllium, Titanium, Magnesium and now Nickel.

    What’s in the Box

    Periodic Audio takes a minimalist stance on their packaging. A very simple box with specifications, charts and description opens to reveal the prize. It is very similar to the other products I have seen from them. It comes with the amp, simple instructions, a medium 3.5mm to 3.5mm interconnect cable and a short micro USB to USB-A charging cable.



    I like the low-key approach. Most of the time the packaging is tossed so why spend big money on it? I’d rather spend the money on product, not marketing.


    Equipment used

    I am using a variety of digital players (Fiio X5iii and X3ii, Cayin N5ii, Hiby R3) as well as my IPhone 7 as the sources. The headphones used were: Sennheiser HD-6XX, AudioQuest Carbon NightOwl, HifiMan HE-400i, Campfire Audio Lyra, Cypher Labs C6IEM, Fiio FH5 andFA1, TFZ Queen and Ibasso IT01 and IT03.




    This thing is small. I mean tiny. I wasn’t expecting it to be this small. I thought to myself, well probably doesn’t have much grunt to it. Boy was that a mistake. The website boasts it delivers 150 mW into 50 Ohms, 250 mW into 32 Ohms, and 270 mW into 16 Ohms. That seems conservative to me .


    It has a quick charging time (about 30 minutes) and battery has real-world usage time of about 10 hours or so. The light turns green when all connections are made to show the unit it powered on. Yellow tells you’re getting close to shutdown (maybe like 15 minutes) and red is imminent power off. When charging it reverses the step red-yellow-green, flashing to tell you’re in charging mode. Solid green is full.

    The one really neat feature was the auto-sensing function. There are no power-on buttons. Simply plug the amp into your source and plug the headphones into the Nickel and it turns on. Unplug either and it turns off. Simple. I can’t remember all the times I used other portable amps and when finished, I forget to turn it off, only to discover when needing it later that it was totally dead. This is one smart little amp.

    The analog, yes analog, ports are snug fitting. You really need to make sure your plug clicks into place. Takes some getting used to but it will ensure that nothing falls out by accident in your pocket.



    The input is analog meaning you feed this from your headphone out on your device. You can retain the DAP’s or phone’s volume control. I was told this due to their unique set-up:

    No worries with double-amping; the amp in your player is feeding Nickel's 10 kOhm input impedance, so it's doing NO current or power - just more voltage gain. So basically there's no "double amping", your player's amp is now a preamplifier (since it's supplying essentially zero current/power) and that feeds into Nickel.

    We did this because we think that the dominant use case will be with cellphones, so we optimized the built-in gain for cellphone use (which typically is 1 to 2 Vrms). And in that case, more gain means you can use less of the volume adjust range in your cellphone (instead of a usable 12-16 clicks, if we had more gain, you may only have 6-8 volume steps between "really quiet" and "too loud").

    The only thing really missing was a way to strap this to a source. Over time, I have had many portable amps and have accumulated various silicone bands and such. Luckily, I had one that was relatively non-intrusive. I know that they can’t possible imagine all the possible combinations that would ensue, but maybe offering some kind of ‘universal’ band to aid in pairing the Nickel to a DAP or phone would be helpful to those who are jumping into the portable scene for the first time.


    So finally, I bring it all around to sound. What does this thing do in terms of volume?

    First off, it is quiet. Even with sensitive IEMs Like the Lyra, it is dead quiet.

    There is some really great power output here. I was a little afraid that this may color the sound coming from my source. I couldn’t detect any coloration. Some amplifier’s output can seem sterile or sound harsh. Not the Nickel. It was invisible to my listening - just nice clean power.

    When using with my DAPs, I found that I needed to drop the volume by maybe 20-25 steps for comfortable listening. For example, when using the Hiby R3, without the amp, I would listen at maybe volume level 40-50, with the Nickel, I would bring it down to about 20-30.

    The bass is really punchy. Nice and tight and extends pretty low. Mid-range had natural, decent details revealed and instrument separation seemed accurate. Soundstage wasn’t as wide or tall as I expected but not closed in either. Treble is nice, some sparkle but not shrill. There’s a nice roll-off.

    All the IEMs I used sounded great. Not any glaring irregularities. No hiss encountered. The unit did seem to meet some trouble when faced with the HD-6XX and HE-400i. These can be challenging to any player/amp due to the resistance or driver configuration. The Nickel held up but I found that I needed to get to almost max volume setting to get it decently comfortable. There was never any clipping - just pushing the little guy to its limits. Kudos to the PA team for delivering such a little device that can go that far.

    Since the Nickel is a portable amp, how many people would wear full sized HPs around outside? Paired with IEMs seem to be the sweet spot. I don’t subscribe to any streaming services so I cannot relate my experience there. All my files are local and I tested a variety of types. Everything from low bitrate MP3s to quality FLAC and DSD.

    What was clear was that due to the transparency of the Nickel, bad files sounded bad but good files sounded sweet. I found myself skipping over the MP3s and really focusing in on the FLAC/ALAC ones I have. Miles Davis' Kind of Blue was superb. All the nuances of his horn and breath were revealed. Chris Isaak Blue Spanish Sky was exquisite. The timbre of Isaak’s vocals was riveting. The club scene on Bill Evans Trio's Time Remembered was encompassing. I could pick up the sounds of glasses tinkling from behind and voices of the audience at tables both distinctly left and right while the trio was dead center.


    I have to give some serious applause for Periodic Audio to bring to market such a tiny, powerful little amp. The Nickel is truly a wonder. Brought power where it was needed without masking or changing the sound from my players. It drove all my headphones with aplomb and never cried out for mercy. It is almost unthinkingly easy to use. With the ability to drive almost everything and adding to an underpowered source, like my iPhone, and still being able to fit this into my pocket with nary a concern, is testimony to the engineers and product planners at Periodic Audio. I was thrilled to own their Be and Mg IEMs and marveled at their simplicity yet was astounded by the sheer musicality they presented. Now we see what that evolved to in the Nickel.

    Small. Simple. Powerful.
trellus and DBaldock9 like this.

Recent Reviews

  1. kevingzw
    Small package, colossal sound
    Written by kevingzw
    Published Jul 8, 2019
    Pros - Clean Power, Small size, Good damping factor, Made in the USA (Kindof or a pro?)
    Cons - Noisefloor is audible across all sources and headphones, Finishing on the chassis, Limited accessories
    Here is a link to my review on the Periodic Audio Carbon's (for those who have not read it).


    "Blah Blah Blah". This is my third time going down this path. I'll let my previous reviews do the talking. Instead, here is a throwback photo to Canjam Singapore 2018 where I met Dan from Periodic Audio for the first time:


    The Nickel is the start of Periodic Audio's foray into digital electronics. Being their first portable amplifier, Dan and his team made sure to fine-tune and improve upon existing prototypes, with feedback from consumers at headphone meets and annual CanJams across the globe. Priced at $299 USD, the Ni is an accessible piece of porta-gear that complements any audio setup.


    Capture 1.JPG
    Capture 2.JPG



    In an effort to save time, I'll spare you the details on the packaging. It is exactly the same as their IEM counterparts. The point of departure starts with the box's contents.

    1 X Periodic Audio Nickel
    1 X 3.5mm to 3.5mm Interconnect (Short)
    1 X Microusb to USB Charger (Short)

    The Nickel's offerings are a little sparse. It would've been nice if Periodic Audio had included rubber bands for a transport-amp stack. It comes as no surprise that Periodic Audio only includes what is necessary, with reference to their IEM siblings.

    Design, Build and Function:


    Loo and behold! It is a tiny black box. Nothing much can be said. Let the image do the talking. I'll spare you the verbose word-dump.

    Adopting a design language as ubiquitous as eating toast for breakfast, all Periodic Audio products are plain jane in the best possible way.

    The most important aspect of the Ni is its chassis. Both the electronics and its outer-shell are machined and sourced from American components. God bless America (tough luck, Shinola). The poly-carbonate chassis feels sturdy and tough enough to weather any storms. The size of the amplifier itself measures to be around 2-3 triple A batteries (I refused to conform to the metric system).

    If space is a constraint, the Ni shouldn't take up too much real estate. My only complaint pertains to the blemishes on the Ni. The $299 USD price tag warrants better quality control. However, these cosmetic defects may be unique to the set I received and they do not hinder product performance.

    The aux in's and out's are marked with large white arrows above them in order to differentiate them from each other. Its design language is foolproof. There are no physical buttons to operate. Instead, the Ni switches on when both aux's are connected appropriately. The green LED at the front lights up during the boot-up process. A yellow LED indicates that battery is running out of juice.

    I have brought them out for several test runs and I can confirm that it works well as an on-the-go solution. I wouldn't recommend anyone to use it as a dongle. As a precaution, store the Ni in a separate pocket if you wish to daisy chain it to your source.

    Another quirk that the Ni boasts is the fact that it doesn't accept or feed a line-signal from either a smartphone or a DAP (Digital Audio Player). Instead, the Aux-in is wired to a 10kOhm resistor, effectively turning your transport into a pre-amp.

    Dan and his team at Periodic Audio make the argument that modern day DACs' in smartphones do not need to be replaced. The reason why headphones sound disjointed on smartphones has to do with inferior op-amps and poor circuitry (high THD etc). With that philosophy in mind, the team created the Ni; a testament to their collective beliefs. It takes the collective minds of mad scientists to concoct such a revolutionary idea.


    The Ni has a battery life of 8 hours, contrary to its small size. Taking approximately than 30 minutes for a full charge, the Ni is the perfect companion for the office and the train ride home. The standout feature to me, is its ability to play and charge simultaneously (useful for a clutz like me who regularly forgets to charge my devices).


    Now to many, this may be a 'controversial" segment. I do not sit in the camp of "amplifiers can make enormous changes to a IEM/Headphone's sound signature". Instead of waffling between stances, I'll say that I'm a firm believer that any changes made to the audio chain from source to transducer will result in real-world "audible changes". However, I will remain cautious so as to not "overrate" the capabilities of the Ni. After all, what matters the most are the transducers in each headphone/IEM.

    Essentially, the functions of an amplifier can be surmised as such; to boost the audio signal to an audible level. It may sound simple in practice, but there are many potential hindrances along the way, not limited to harmonic distortion, noise and clipping.


    In the first few hours of using this tiny device, the first thing I noticed is a faint hiss in the background across all my headphones (from the Campfire Audio Cascades to the Hifiman HE400I). In theory, the 10kOhm resistor should eliminate any unwanted background noise from double-amping with the source's built in amp. Unfortunately, the real-world results differ on this front. If you're planning to use the Ni in noisier surroundings, the hiss is unlikely to be picked up on.

    Across the board, the Periodic Ni powers all my headphones/IEMs' with ease. The most "power-hungry" headphone I own is the Hifiman HE400I (35 Ohms, 92 dB). For a planar magnetic headphone, it is considered by the community to be highly efficient. From the Campfire Audio Cascades (38 Ohms, 100dB SPL/mW) to the Periodic Audio Carbon (32 Ohms, 98dB SPL/mW), the Ni serves to enhance, not to change the sonic characteristics of each product.

    Across the board, the biggest improvement I could identify is how spatial cues sound less congested or closeted. With its enormous 250 mW power output (into a 32 ohm load), bass response is tightened substantially. Each driver attacks and decays at an accelerated rate. Everything sounds cleaner. I'm guessing these improvements are the result of its ultra-low THD (Total Harmonic Distortion) and high current output

    Tyler the Creator's Earfquake is a track with unhinged sub-bass rumble. The Campfire Audio Cascade's penchant for ultra-low vibrato is ameliorated by the Ni's excellent damping factor. The mids are clearer, less hazy and brought forward in the mix. If I had to quantify the noticeable improvements, I would say that there is a 25% improvement; an impressive feat.


    Their entry into the portable-audio space has proven to be a success. The Ni's touted power output and its non-descript looks are sure to capture the attention of "utilitarian" audiophiles. With its unique design quirks and its distinct "conspicuousness", the Ni is an animal that adapts well to any audio setup.

    You'll be hard pressed to find any alternatives to this stellar amplifier.

    Make no mistake; this little powerhouse punches way above its price point.

    To purchase the product, visit: https://periodicaudio.com/product/ni/

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  2. B9Scrambler
    Periodic Audio Nickel: Simplicity
    Written by B9Scrambler
    Published Apr 20, 2019
    Pros - Small size and light weight - Decent battery life backed by impressively quick charging (20-30 mins) - Uncolored signature - Quality components were used
    Cons - Very picky about source when using sensitive iems - Lack of accessories - Price (maybe...I understand why it is as it is, it just feels too high)

    Today we're checking out the Nickel [Ni], a tiny portable amplifier from Period Audio.

    Periodic Audio was founded in 2016 by a small group of audio enthusiasts/specialists with over 140 years of combined experience in the industry. Their aim? To provide accessible, high performance audio products that focus on portability, sound, and comfort, not glitz and glamour.

    While it isn't much of a looker, the Ni is packed with tech resulting in a very compact, powerful amp that can easily travel with you during the day. While it is light on features, those that are included make it a very convenient product to use along with your other every day carries.

    Let's dive in and take a closer look.


    Thanks to Dan with Periodic Audio for asking if I would be interested in checking out the Nickel. It looked like an interesting product from the product information that has been released at the time, so I accepted and a sample was sent for review. The thoughts within this review are my subjective opinions based on around a month of use. They do not represent Periodic Audio or any other entity. At the time of writing the Nickel retailed for 299.00 USD. You can check it out here on their site: https://periodicaudio.com/product/ni/

    **Note that this is a b-stock unit. It functions fine but has physical blemishes. Expect a-stock units to be cleaner than the one shown here.**

    What I'm looking for:

    When it comes to portable amps and DAPs I take a pretty casual approach. If you're looking for an in-depth look at this thing with measurement graphs going over THD, sinewaves, etc. you'll want to look elsewhere. All I really care about is how easy is it to use? Is it well built and will it be durable long term? How's the driving power and overall sound quality? Are the batteries going to run dry part way through a listening session? Is this the kind of device I'm going to take with me everywhere, or it is better suited to listening in the privacy of my home?



    Full specifications and measurements can be found on the product page (link in 'Disclaimer'). I recommend visiting it if you like graphs.

    P1000669.JPG P1000670.JPG P1000686.JPG

    Packaging and Accessories:

    The Ni arrives in some neat environmentally friendly, cardboard packaging. On the front is a wireframe-style image of the Ni and the components that make it up. In the top right is the Periodic Audio logo, and the bottom left the Ni log as seen on a periodic table of the elements. Opening the top flap reveals a couple graphs, one for THD and the other showing the gain, along with a list of specifications and some product information. Around the sides of the package are black and white macro images of on of their earphones as well as some additional branding. The back contains more information about the Nickel.

    Opening the side flap which requires quite a bit of force thanks to the strong double-sided tape, there is a second cardboard box that is free of any branded or logos. Inside is the Ni tucked tightly into a cardboard cutout. The only included accessories, a 3.5mm aux cable and microUSB cable, are lightly draped into a second cutout. In all you get:
    • Nickel amplifier
    • 3.5mm aux cable
    • microUSB cable
    Overall a solid unboxing experience. I appreciate that they included measurements with clear axis labels and none of the stylized flourishes you usually see when they are included on packaging. Periodic Audio provides a lot of useful information about features and components too, versus the marketing fluff that is more common in the industry. It would have been nice to receive some additional accessories given the price, such as a carrying case for the amp and cables. Maybe a few different aux cables of varying lengths or with jacks of varied styles (ex. 90 degree, 45 degree, and straight) to ensure you get something that is ideal for your portable setup. Other amps include rubber bands to strap the device to your source. Some of those sized to fit the Ni would have been sweet since none of my existing bands fit. Or maybe some Velcro tabs instead. Anything extra would have been nice and helped make this package a better value.

    P1000675.JPG P1000676.JPG

    Build and Components:

    The Ni has a rugged, polycarbonate shell. The only flourishes breaking up what is otherwise a matte black brick are the white painted Periodic Audio logo and arrows above the input/output jacks. When I took mine out of the packaging, there was a a dusting of what looked to be dried glue or paint smattering the top. While it was easily wiped off with a damp finger, I also saw prominent seams between the two main component parts that made up the shell, along with globs of white glue poking out between those seems. I'll be honest, it looks more like a prototype than a finished product, though being a b-stock unit I was expecting it to be less that perfect. That said, even were this not a b-stock unit the Ni visually is not particularly impressive. It's too simple in design for that. It does feel extremely tough though with no flex or give anywhere when squeezing it. Can't say the same for the metal bodied Xduoo Nano D3 I reviewed a while back. Fit around the important parts, namely the 3.5mm in and outputs, the LED light, and the microUSB slot in the back, is tight leaving no room for play. These somewhat delicate components are well protected.

    When it comes to components, that is where the Ni's seemingly high price tag comes in. Periodic Audio clearly put a lot of thought into what was going to go into the Ni. First off, it uses a brand new Texas Instruments INA1620 chip. This chip can output 140 mA, continuous per channel, and carries along the Ni's theme of being tiny and portable. This chip is apparently so small they were able to cram it and some other bits and bobbles into the space between the input and output ports. Powering the amp and the amp alone is another piece of Texas Instruments tech, the TPS65133 power controller which results in a low noise floor. A 16F1503 microcontroller from Microchip controls everything including the smart charging setup and LED indicators. TRRS jacks are used which is a breath of fresh air. Why? If using the Ni connected to a phone which seems to be what Periodic Audio is intending, you can plug in a set of headphones or earphones with an inline mic and media controller and not lose that functionality. I personally don't know of another amp that permits this. What else did they cram into this thing? How about a short depth microUSB connector that allows you to use any microUSB cable with it should you break or lose the included cable, or maybe you just want to use a longer one. Since this little device is going to be in close proximity to other electronics, they also added class IV ESD protection that can handle a 32kV surge. Unnecessary, and I love it. RF protection is in place too, enough to address 10 times the legal RF noise limit at 1cm.

    The lithium polymer battery isn't huge at 280mAh but provides a good amount of play time with the Ni; 8-10 hours. More impressive is the charge time of between 20 to 30 minutes via USB. I see 20 to 30 because their product page says 30 yet the packaging says 20. Either way, it is not marketing fluff and it really does charge that quickly. From the USB 3.0 ports on my ASUS FX53V, the Ni charges to full in just under 30 minutes. For nearly 10 hours of play time, that's truly awesome and the convenience is unmatched among any other amp I've used.

    P1000671.JPG P1000680.JPG P1000672.JPG

    Using It:

    There's not a lot to say about using the Nickel. Plug an aux cable into the input, plug your headphones into the output. It will automatically detect them and turn on as evident via the bright green LED located between the two ports. Just be sure to always plug the headphones in last else you experience a massive and unpleasant POP that leaves me worrying about the health of the headphones/earphones I just plugged in. As the batteries drain, the LED will change from green, to yellow, to red. When charging is needed, plug in the USB cable and wait 20-30 minutes. You don't have to stop using the device either since it works while charging.

    In terms of sound quality I found the Ni impressively balanced and uncolored. It doesn't add in additional warmth or bass, jack up the midrange, or crank in extra treble. Using it with my HiFiMAN Megamini reduces the warmth of that DAP and as such I don't feel the need to always pair it with neutral to bright earphones. Pairing it with a flawed budget offering like the Ruizu X02 doesn't fix the early low end roll off of that device, but it does do an amazing job of correcting the harsh upper ranges. The Ni doesn't “fix” the source device, but it can mask some of their shortfalls.

    With more demanding to drive gear and/or that which benefits from amping such as the Brainwavz Alara, HiFiMAN Sundara, ADVANCED Alpha, etc., the Ni makes for an outstanding partner. The volume boost is only 6dB, but it allows you get to the most out of your DAP or phone's standard output without having to worry about distortion should you push it. It results in good, clean power that allows you to listen at pretty much whatever volume you want. However, when pairing it with sensitive headphones like the Campfire Audio Solaris, Cascade, or TFZ Secret Garden HD, things aren't quite as peachy keen. The source, be it a DAP, phone, laptop, etc. makes or breaks the experience.

    I noticed there is always some hiss with sensitive headphones, and depending on the source that hiss is going to increase or decrease. My HiFiMAN Megamini, F.Audio S1, and HiFi E.T. MA8 all pair poorly with the Ni, MA8 in particular, adding quite a bit of extra background noise into the mix. My LG G5 and G6 fare better, akin to levels present when having earphones and an aux cable plugged in so the device is on but no music is playing. Noisy but plenty tolerable and masked when music is playing. My Shanling M0 really cleans everything up and is the best pairing of all my devices with the cleanest background of the bunch by far. The M0, Ni, and Campfire Audio Solaris together is a trifecta of perfection providing one of the most satisfying portable listening experiences I've had to date. The Shanling M1 and my PSVITA also worked well with the Ni.

    Final Thoughts:

    I'm somewhat torn on the Nickel. On one hand I love the tiny size and excellent driving power it outputs. The design isn't particularly attractive, but it's small and durable and the device is about as easy to use as it gets. No dials, no knobs, nothing to go wrong or fiddle with. On the other hand, the basic looking shell and lack of features like gain, bass boost, volume control, etc. make the 299 USD price tag difficult to justify. Until of course you look at the component parts and the engineering that went into making the device. That brings the price somewhat back into line with expectations. But then you experience severe and painful popping if you plug the headphones in before the source. Always go source then headphones. With the Ni there seems to be a lot of give and take. Lots of “X is great, BUT, watch out for Y.”

    The size is very appealing though. I don't like carrying around bulky, heavy, devices regardless of how competent they are, like the Auglamour GR-1. Amps that skew the sound signature, like the Walnut F1, reduce compatibility with various earphones and headphones since it risks boosting treble too much. None of this is an issue with the Ni though it is way more picky about earphone sensitivity, and especially the source device, when compared to any other amp I've used. When you start pairing the Ni with sensitive iems, you need to be very choosy about which source you use since there is a good chance the quantity of background hiss will be overwhelming. I'm lucky I have a number of DAPs and devices to mess around with since only a small handful of them retained a nice, clean background. The rest were noisy enough to require either an uncomfortable volume level to compensate, or were simply unlistenable, like the Solaris -> Ni -> MA8 combo. You can bring something like the iFi iEMatch into the mix to deal with the hiss but that negates the volume bump provided by the Ni. You also find yourself with a silly chain of devices that gets cumbersome to carry around, eating away at the size advantage and simplicity.

    The Nickel clearly isn't for those that like to tinker and toy with their sound. It's an amp, and that's it. The few features it has are convenient like auto-on/off and especially the impressive charge time. That said, it seems like a device made for someone already deeply invested in the hobby, not newcomers. Someone who has lots of sources and headphones can mix and match to find which pairings work best with the Ni. It would also be good for someone that listens primarily to headphones with lower sensitivity and higher impedance since the hiss issue is completely nullified, leaving you with a tiny, powerful amp that makes pretty much anything mobile.

    I like the Ni and will certainly continue using it beyond this review, but it is tough to recommend to its intended audience; mobile users. Its pickiness with source when using sensitive headphones and iems, which most are when it comes to devices intended for mobile use, might be a deal killer. That said, if you're interested in the Ni and plan to use it with headphones that require amping, go for it. You'll be treated to a compact, powerful device with a flat signature, decent battery life, and an amazingly short recharge time.

    Thanks for reading!

    - B9Scrambler
    1. Chessblitzer2017
      Thanks, confirmed what I thought since doesn't have a dac and would be using from a pixel with terrible sq. Thank you for being honest and not cowtailing, saves people literally 100s of hard earned $$$.
      Chessblitzer2017, Jun 9, 2019
      rezakhalvati and B9Scrambler like this.


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