Fosi audio p1 vs p2 forum.
Jul 25, 2021 · The Fosi P3 Kickstarter is live.
Fosi audio p1 vs p2 forum . I have already thoroughly familiarized myself with the Feb 13, 2025 · I compare the Fosi Audio BOX X5 phono premp with the Audio-Technica AT-PEQ30 and the Douk Audio T4 Pro. Idea Harvest is your platform to suggest new features, design improvements, and product concepts, directly influencing our next-generation offerings. For anyone interested in joining, details can be found here Fosi Audio Product Tester. Your success using the VOL20 will greatly depend on your audio source. In the open, I am not narrowly glued to any audio equipment brand and will not give any product an easy pass with Fosi Audio P2 download instruction manual pdf Fosi Audio P2 Headphone Amplifier Vacuum Tube Headphone Amp Mini Hi-Fi Stereo Audio with Low Ground Noise Output Protection This subreddit is for the budget minded audiophile that wants to grow out of soundbars, boomboxes, mini systems, portable bluetooth, lifestyle speakers, and PC peripheral branded audio solutions. It was sent to me by the Jul 28, 2023 · Fosi Audio has stepped up their stereo amplifier game with the new Fosi Audio V3, a completely new design inside and out which delivers not just a more distinctive chassis design, but also improved internals that make it sound quite a bit better than previous offerings by the company, all while keeping the price really affordable. the P1 and the P2. There's been some talk about this amp on other forums like Audio Science Review, but I didn't see anything on AK, so thought I'd post some thoughts here. This is the second Fosi product I have tested Dec 18, 2022 · Hello, I recently bought an ART DJPRE II to replace my modded Fosi Audio X2 because it distorted at higher levels than the normal 39 dB. The only bad audio system, is the one you don't enjoy to the fullest. The model was launched as a fundraising campaign that successfully achieved 10 times of the pledged goal. 99 (save 40) $160 is €134,56 but could get much much higher do to import taxes and handling fee Another amp (s) that look alike again aiyima,douksound (nobsound) and fosi audio How do we know what to buy if the price and power supply size is the same ? Jan 10, 2024 · The P3 is a tube-based preamplifier which incorporates a number of features that complements the Fosi Audio V3 integrated amplifier. These is a Bluetooth input, tone controls, a preamp output and a headphone socket. It is definitely an entry level device which is fine We would like to show you a description here but the site won’t allow us. click. Equipped with two 6K4 tubes, it offers a musical and warm sound reproduction, typical of this type of design. We pledge to bring more amazing Hifi gear with high value for the price, innovative design, cutting-edge technology, and premium quality, to audiophiles worldwide. RCA input to the computer, CD, phone, iPod and other player and RCA output to the digital amplifiers, active multimedia Nov 17, 2024 · "Introducing the Fosi Audio GR40 DAC Tube Preamp and Headphone Amplifier: A harmonious blend of vintage warmth and high-performance chipset. I am getting mine today and hope it is the new version! Fosi Audio $40 Tube-P1 Tube Preamp | Listening Thoughts, Quick Review and Teardown Emptor Audio 323 subscribers Subscribed See competitors, used pricing, and more. My expectations were low. We focus on education, discussion, and sharing of entry and mid level separate & multi component audio systems. On the front of the device, you will see a Treble, Volume, Bass knob and the Source switch along with the 3. to/3QAoj87 Aliexpress - https://s. 5mm pre-out connection for an external subwoofer and a 3. Their products are engineered for versatility and power, serving both audiophiles and gamers with impressive performance at competitive prices. I found the Fosi P2 tube amp on Amazon for cheap and decided "what the hell" and ordered. It seems similar to the Fosi P1 but with Bluetooth and a nicer case. The 7-pin 5654W tubes stick out from the top and hence the P3 needs to be placed on top if you Feb 1, 2025 · Hello there to all on their respective audio journeys. fosiaudio. It's the Q6 DAC. View the Fosi Audio TUBE-P1 manual for free or ask your question to other Fosi Audio TUBE-P1 owners. On the rear, There's a Product Specifications Fosi Audio P1 is a Mini Hi-Fi Tube Pre-Amplifier with Treble Bass Tone Control for Home Theater HiFi System, comes with two 6K4 tubes, which can be replaced by 6AK5, EF95, 5654,403B tubes. and a single tube 'buffer. It was sent to me by the company and costs US $179. I was going to order the Fosi Audio P1 Tube Preamplifier Mini Hi-Fi Stereo Preamp 6K4 Valve Vacuum Pre-amp with Treble Bass Tone Control for Home Theater HiFi System (not for Turntable) : Amazon. Fosi Audio | Experience Audiophile-Grade HiFi Joy, Made Accessible. Jul 1, 2025 · Fosi Audio ZP3 Preamp - Versatile control hub for home audio with 3 inputs/3 outputs. Fosi Audio makes quality hifi accessible worldwide by offering a diverse range of amplifiers, preamps, and DACs that blend modern engineering with vintage-inspired design. Aug 28, 2024 · Making the VOL20 fit into my audio chain required a bit more creative thinking as neither of my components - the WiiM streamers or Fosi Audio amplifiers - have the ability to connect an external controller, apart from the supplied remote control. May 18, 2025 · This is a review and measurements of the Fosi BOX X1 budget moving magnet phono preamplifier. Read my written reviews with scores at https://iiwireviews. https://www. I am considering moving to a xduoo MT-602 for the additional features this one has. Fosi Audio P1Fosi Audio P1 Tube Pre-Amplifier Mini Hi-Fi Stereo Preamp 6K4 Valve Vacuum Pre-amp with Treble Bass Tone Control for Home Theater HiFi System (not for Turntable) Fosi Audio Jul 31, 2021 · Fosi Audio DA2120C is unnaturally expensive on amazon. some highlights below RCA input to the computer, CD, phone, iPod, and other player and RCA output Aug 17, 2021 · So, a good friend surprised me via an Amazon shipment with a gift of a Douk P1. I wish they Fosi Audio P2 Hi-Fi tube headphone amp, 2 X 6K4 J-Grade tubes can easily power high-performance headphones. After spending time and comparing the V3 to some other amplification options, a few Posted by u/kunalsinss - 2 votes and 5 comments Oct 27, 2023 · My audio source is a Denon DNP-800NE Music Streamer which passes through a Fosi P1 tube preamp (Denon > P1 > BT20APro). Dec 18, 2022 · I bought a $60 Fosi Audio Box X2 tube preamp. The Bluetooth quality on this thing stinks. With a strong reputation built on solid We would like to show you a description here but the site won’t allow us. Mar 1, 2025 · Personal presentation of the Fosi Audio P4 preamplifier In my latest recommendation, I present the Fosi Audio P4 preamplifier. Bought a week ago from fosi audio ,no longer required due to the arrival of the new preamp. With the RCA input to the computer, CD, phone, iPod and other players, and RCA output to the Powered Speakers, active multimedia audio devices for lossless audio(The RCA cables not Jan 13, 2024 · This small Fosi Audio ZA3 integrated amplifier has the particularity of being able to operate in both stereo and mono mode. Pair it with a set of JAN 5654 tubes and a set of LF353N tubes for $32 and man it really becomes something else. When I look closely at the 1st photo in this thread it looks like there is a separate 3. RCA input to the computer, CD, phone, iPod and other player and RCA Dec 28, 2023 · I read positive review about Box X4 tube MM phono preamp and decided it is worth a try for a starting point as soon as I got my Rega Planar 2 turntable. Jun 15, 2023 · I'm not particularly knowledgeable about audio, but I'm in search of a Bluetooth sound solution that offers excellent quality. Dec 18, 2023 · Your go-to resource for unbiased opinions, detailed assessments, and user experiences about Fosi Audio products. I'll be upgrading both of those several times before the DAC/Amp. The Fosi Audio V3 Mono amplifier aims to offer monoblock performance (usually reserved for high-end systems) in a compact, accessible package. XLR balanced & audiophile-grade components for pristine sound. to/3BFSDZW Fosi P3: https://amzn. For some background: I currently have an older Topping TP20 Mk II that had sat in its box for years (it was purchased on a whim but I only had severely inefficient speakers at the time). First, let's see what we get. Having been suitably impressed with their Audio Box X5 phono preamp, can they impress me again with the V3 Mono? Aug 19, 2023 · I had the opportunity to check out a Fosi V3 recently. I recently set this up with a pair of Jan 6, 2019 · I recently got the Fosi P1 tube preamp because it has the tone controls (just in case they help) that the amp you linked lacks; in the future I’m thinking of trying that again, or one of their other amps as there’s a couple that do intrigue me — a supposedly 300 watt class D for around $150 with the separate power supply needed, or their Sep 21, 2025 · The Fosi Audio P2 is one of those rare pieces of gear that quietly surprises you. The V3 Mono amps are best suited for speakers that need more current and whose impedance vs. Same high temp behavior is observed when connected directly to the Denon (ie without the P1 in the loop: Denon > BT20APro) and persists whether the Denon or the P1 are powered on or off. Elevate your sound quality, reduce noise, enjoy pristine audio with our range of preamplifiers. Jul 25, 2021 · The Fosi P3 Kickstarter is live. This review is just to show some of the similarities and differences between the P1 and the P3 Preamplifiers from Fosi Audio, and to maybe help you to decide which one is best for you. Oct 14, 2003 · I'm using a Fos Audio P2 headphone amp in my "secondary setup" (Wiim Mini with Qobuz, an old Sony Blu-ray for CD transport and a Cambridge Dacmagic 100), and for the money it's s great little amp! I don't normally post much, but after trying out the Fosi V3/P3 combo and then the MC101 I don't think I will be taking another chance on Fosi products. After listening to it for about an hour this is what i hear: With Stock chinese 6j1P tubes. Physically and visually, the P3 matches the V3 having the same footprint and design. But I am super shocked at how well it performs as a preamp for my Magnavox Gillespie 8601! Really a neat FOSI AUDIO is a Chinese company that manufactures various products such as DAC/AMP, DACs, Amplifiers, dongles, soundbars, etc. ?' (don't remember the model#, it's down in my Humble home) Never had any issue with any of em. Let me explain. It displaced an Outlaw 975, drives a Crown PS-400 into my Snell D7s and is pretty much spectacular on well recorded jazzy stuff. Fosi Audio P2Fosi Audio P2 Headphone Amplifier Vacuum Tube Headphone Amp Mini Hi-Fi Stereo Audio with Low Ground Noise Output Protection Fosi Audio Product Specifications Fosi Audio P1 is a Mini Hi-Fi Tube Pre-Amplifier with Treble Bass Tone Control for Home Theater HiFi System, comes with two 6K4 tubes, which can be replaced by 6AK5, EF95, 5654,403B tubes. Jul 8, 2025 · Fosi sent me the ZP3 preamplifier for review. Engage with expert advice, troubleshoot issues, and enhance your product experience. The sound is predictably tube-y Dec 3, 2021 · I just ordered a Fosi P1 to play around with because it was super inexpensive on amazon but would rather (maybe) try the P3 if it becomes available soon. Aug 28, 2018 · Our Story At Fosi Audio, our mission is simple yet powerful: to create products that produce exceptional sound quality and inspire people to listen to music on a daily basis. in: ElectronicsAbout this item 🍎 NOTE: This is a preamplifier, not a power amplifier or phono preamp, can't be used for turntables or passive speakers. It aims to improve audio quality by reducing unwanted noise and giving options for adjusting gain levels to suit different setups. Not much discussion of the internals yet. I was not paid to review, but it was sent on the condition that I would post my review online. Headphones amp also can be used as a stereo preamp. Jul 28, 2023 · At it's price, and with the higher voltage power supply, I was impressed by the Fosi V3 Amplifier. With the RCA input to the computer, CD, phone, iPod and other players, and RCA output to the Powered Speakers, active multimedia audio devices for lossless audio(The RCA cables not Apr 5, 2025 · Fosi Audio Box X5 Phono Preamp Discussion in ' Audio Hardware ' started by rischa, Apr 5, 2025. It was clear from the beginning that sound from Fosi X4 preamp was colored, mudddy and lacking dynamics (softly speaking - in reality it's "rounding Nov 4, 2025 · Another *advice sought* thread :) I am trying to decide between two small class D amps by Fosi Audio: **Fosi BT20A Pro** **Fosi P3 Tube** Both have bluetooth for my iPhone, and both have RCA in, and have tone controls ( essential because of my tinnitus Fosi Audio P3, a brand new headphone Vacuum amp from Fosi Audio. It incorporates two TI TPA3255 amplifier chips enabling it to deliver up to 2x150W or 1x240W @ 4Ω. 25" bookshelf speakers and a kef 8" subwoofer. Photo link attached. Jan 2, 2024 · Customer Support & Care Dedicated to providing assistance and solutions for your Fosi Audio products. A new arrival has been added to the orange button family Fosi Audio P1 Tube Pre-Amplifier Mini Hi-Fi Stereo Buffer Preamp 6K4 Valve & Vacuum Pre-amp with Treble & Bass Tone Control for Home Theater System 🍎 NOTE: This is a preamplifier, not a power amplifier or phono preamp, can't be used for turntables or passive speakers. The ZD3 manages at the same time to look elegant/modern and cute! The choice of round display is smart as is displaying the level the largest in the Manual Fosi Audio TUBE-P1. Definitely Feb 14, 2025 · Background Full disclosure, Fosi Audio was kind enough to send me their T20 Bluetooth (BT) Tube Amp free of charge as part of their Audio Product Tester Program. aliexpress. I think it's a good buy. In side of the box, The P3 it self, Bluetooth antenna, pair of GE JAN 5654W tubes, the manual and the power brick. ly/46P95BOmore Fosi Audio P2 Hi-Fi tube headphone amp, 2 X 6K4 J-Grade tubes can easily power high-performance headphones. I got the Fosi P2 today and i paired it with my Sennheiser HD560S, my budget setup looks like this 2022 Gaming Laptop with Realtek 256 chip> Fosi P2 amp> HD560S Bear in mind im no expert, my previous headphones wer a pair of Sennhesier HD25 II 70 Ohm. I am eagerly writing this after Fosi Audio sent me a unit for review and asked for my unbiased, no-holds-barred feedback. com/product/phono-preamplifier/#vin Jan 28, 2023 · Der Fosi P2 Kopfhörerverstärker ist ein ziemlich beliebter Verstärker. Sep 18, 2024 · This is a review, detailed measurements and listening tests of Fosi Audio DS2 portable DAC and balanced headphone amplifier. Thank you all! As a brand committed to designing and developing products based on user feedback and demands, Fosi Audio swiftly responded to customer Discover the world of audio refinement with our Preamp products. Like @lovinthehd there are better ways to EQ than tubes and good pre-amps should be clean and not inherently add their own sound to the signal. Sie müssen Ihre Zeit nicht mit Amazon US - https://amzn. All the of the Sep 8, 2019 · Hi everyone! I came by this Chinese audio/Hi-Fi make, Called Nobsound! My question is if it is useable or if it is trash? And if the results are bad on Paper, does that mean that it sounds bad for the Human ear?!!! I have a pair of home made Speakers, witch sound great for me! So would it Jan 31, 2025 · Fosi Audio ZD3 Balanced DAC Review This is a review and detailed measurements of the Fosi Audio ZD3 balanced stereo DAC. There is a pre-amp out, two headphone connectors, and more power than the P2 has. Does it perform?Fosi audio: https://www. Speakers like my KEF LS50’s, some Dynaudio monitors that have a 4 ohm nominal impedance, and even Magnepan . Maybe you Feb 11, 2025 · The Fosi MC331 also offers practical connectivity options, including a 3. 5mm headphone output. Nov 22, 2024 · Background Full disclosure Fosi Audio was kind enough to send me the new GR40 DAC, Tube Preamp and Headphone amplifier free of charge as part of their Jul 27, 2024 · The Fosi Audio ZA3 and V3 (stereo) amps do not have the Post Filter Feedback (PFFB) circuitry, but they are both great sounding Class D amps. I bought one for my office as an upgrade from a cheap class D amp similar to this Fosi Audio and I'm telling you it was a 5x upgrade for 3x the price. Now for this pre-amp, I'd be more impressed if it didn't have tubes, and maybe more inputs. I'm curious to know what the general consensus is on these forums regarding the purchase and overall satisfaction with Fosi Audio amplifiers and Bluetooth products for May 25, 2023 · The Fosi Audio P1 is an ultra-compact vacuum tube pre-amplifier that delivers exceptional sound quality in a small package. Older 60s and 70s tracks sound better. I also used the same amps connected to other DACs to compare against the ZD3. Jul 4, 2009 · The first extender arrived, so I was able to assess the options for fitting the pair of Burson V6 Vivid opamps in my Fosi Audio P1 tube pre-amp. com/Support the channel v Jan 16, 2025 · Brad’s Audio Review (1/7 through 1/11/2025) Fosi Audio ZD3 This is my first real review of a home audio product, the Fosi Audio ZD3 DAC (digital to analog converter). Yes, the impedance of Fosi Audio P2 is 32~600Ohms, which means it can drive most headphones, and the impedance of Hifiman 400SE is about 25Ohms, so it is suitable for your headphones. See the album for the answer to all the question of fitting in the other apparent spaces. 8cm) wide by 2 1/4" (5. Have zero desire to upgrade from here. Dec 21, 2004 · Fosi Audio P3 is a small footprint aluminium chassis, hybrid (includes both solid state and tube amp components), Bluetooth compatible pre-amp and headphone amp. So far, there's not a ton of difference that I can hear between it and my Fulla 4. Bad. I have not been paid or asked to review positively or to put any kind of bias in my Mar 14, 2024 · Fosi Audio P3 is a tube preamplifier costing ~$80 and this is my review. Alas, there is only space for one with the case closed. Fosi Audio P1 download instruction manual pdf Fosi Audio P1 Tube Pre-Amplifier Mini Hi-Fi Stereo Buffer Preamp 6K4 Valve Vacuum Pre-amp with Treble Bass Tone Control for Home Theater HiFi System Top to bottom: Fosi audio TUBE-P2 $50: out of the box it was perfectly fine for the $50 I paid for it. Jun 30, 2023 · Fosi has decided to increase their aesthetics and objective performance recently, instead of cranking out the same pieces along with Aiyima, Doug, FX Audio and other Chinese makers, and I appreciate that Fosi notes better objective performance of the P3 over the P1. At first glance, it seems like a modest headphone amplifier with tubes charming, yes, but perhaps just another addition to a crowded market. Aug 29, 2022 · Hi you all seem to really know your stuff, my GF is buying a Fosi Audio P2 Headphone Amplifier Vacuum Tube Headphone Amp Mini Hi-Fi Stereo Audio with Low Ground Noise Output Protection, and use it with FX-Audio DAC-X6 Mini HiFi 2. BOX X4 manual Box x1-old P1 manual P2 manual P1 PRO manual *Manual For Headphone Amplifier: N2 manual PH04 manual DS1 manual DS2 manual K1 manual K2 manual K3 manual K4 manua l K5 manual HD3 manual *Manual for Speakers: B10 manual A3 munual A5 munual C1 manual C2 manual C4 manual B2 manual * Other: BT05 User Manual DS1/DS2_foobar_full Jul 4, 2009 · My <US$40 Fosi Audio P1 tube preamp/buffer with bass, treble and volume dials has two TI NE5532P s. Hey, this is nto a bad looking box! :) This being a simple MM phono stage, there is not much to it: FOSI BOX X1 Phono Preamplifier Measurements Apr 24, 2024 · The new Fosi Audio V3 mono is both a natural next step for Fosi Audio using that process, but I also feel that this Power Amplifier has moved Fosi Audio into the next tier of Audio products where people want a product with no limitations or restrictions and do not care how much something costs. We'll see but I like what a few have said about it here. It is on kind loan from a member and costs US $36. I promptly replaced the cheapo tubes with NOS GE tubes. 80s studio stuff not so much so far. With a diverse range of Hi-Fi audio products available, we take pride in designing, manufacturing, and selling premium audio gear that aids your journey towards the perfect music experience. I have been sent this unit by Fosi Audio through their tester program. despite the fact that the thread linked below reads like an influencing infommercial to me, I've preordered two Fosi Za3's Mar 12, 2025 · Fosi Audio continues to make a name for itself, delivering audiophile-grade equipment at surprisingly wallet-friendly prices. I am just getting started with setups more sophisticated than a smart phone. Certainly economical at $65 kickstarter price, and looks nice. Feb 6, 2024 · I've purchased some products (Douk audio, Nobsound) IMO, they're all made by the same people. Shop global. Buy these preamps (affiliate links): Aiyima T1 Pro: https://amzn. Nov 18, 2023 · It’s a marvelous very cheap class D amplifier based on the TPA3255 chip, with a great finish, good components (genuine Nichicon, NCC, and Wima caps, Japanese Sumico inductors, NE5532 op-amps in sockets - Fosi Audio recommends you to swap for the better op-amp of your taste) in a lovely, understated and "serious" casing that receives a special attention to cooling. amazon. Live music sounds great. I gave it some time to work in my system (AN AZ3 speakers and Exposure 2010S amplifier). The 6K4 tubes in this preamplifier can be rep May 29, 2025 · Fosi Audio Box X2 Phono Preamp Review: Worth the Hype for Vinyl? When looking for a phono preamp that offers clean sound and flexibility, the Fosi Audio Box X2 is one that caught my attention. Aug 26, 2025 · I have a little collection of dj mixers and amplifiers which I switch out from time to time. Also according to some buyers there seem to be an "older" version of P3 where Fosi sent them newer version of the board which sounds better. Oct 18, 2022 · Further Information: Selling this little entry level preamp that will add some tube flavours to the system. 0 Digital Audio Decoder DAC. Contribute to the evolution of Fosi Audio by sharing your ideas and needs. I think in Fosi's urgency to cash in Jun 30, 2023 · I compared the specs of P1 and P3, P3 is higher specd and should sound better. In the photos they look like GE tubes. Including Fosi audio. With its sleek and minimalist design, the P1 is a great choice for music enthusiasts who value both performance and aesthetics. This amp does fit the bill. The review is an unbiased and no influence overview of my experience and what I heard, while fitting various amps to the ZD3. This is the first time I have the opportunity to review a product from the brand, and the equipment in question will be the DAC/AMP Dongle FOSI AUDIO DS2. For a full review and presentation. Using it with a pair of Aperion Audio 5. This is the latest product currently available in the company's range. These additional features make the amp even more versatile for different audio setups. I personally love it technically it might not be the best but it puts out enough power to comfortable drive my 400ses at about 1/3 of max volume. Feb 15, 2025 · Here is a (not so) short review of the DAC/preamp Fosi Audio ZD3. like these. Feb 26, 2023 · I've been using a P3 for about 10 tracks so far. com/e/_ok9 Fosi Audio Official - https://bit. 4 cm) high by 7" Aug 20, 2023 · Fosi Audio V3 op-amp rolling, has anyone tried it? Snake oil? Or are there actual differences? Nov 7, 2023 · The Fosi Audio P3 is a Tube based pre-amp/amplifier with the option to customize your sound using the treble and bass controls. While my tube research has indicated some good choices for tube rolling, my opamp research has led me here seeking advice, even after having read many posts in this thread. All of my amps have volume control so this hasn't been an issue before, but I recently acquired an amp without volume control, so I have a need for a preamp to solve that issue. 99. frequency curves can dip to 4 ohms or even less. This device strengthens the "V" series. Explore our high-fidelity home audio components for exceptional sound in any setting. de took the price from there website $159. Experience the rich, detailed sound of JAN 5654W tubes and ESS9028Q2M" #FosiAudio #GR40 #DAC #Preamp I found a chineese youtube video about GR40 Apr 8, 2025 · Presentation of the Fosi Audio Q6 Dac, and personal experiences I had the honor of receiving Fosi Audio's latest product before its released. The P2 and an apple dongle provide adequate power for my hifiman sundara. The problem is I can't really tell which one is really better, it seems to me that the Fosi is kinda brighter or as more resolution and the DJPRE II is darker May 14, 2019 · Guided by our mission of "Redefining HiFi with Unmatched Value", Fosi Audio continues to fuel its passion for the Hifi industry, ramp up R&D efforts, and co-create new HiFi equipment with users. Choose Fosi Audio for an The Fosi Audio Tube-P1 presents itself as a compact, efficient and low cost tube preamplifier. The Fosi Audio P3 might look small and innocent but the little guy is actually a rich-featured vacuum tube headphone amplifier, Bluetooth amplifier and pre-amp. Once you actually sit down and listen, the picture changes dramatically Works well as a very basic tube hybred option. To begin, here’s a disclaimer about the product. 5mm pre out, hopefully tied to the volume control. Warum eigentlich nicht? Er ist beeindruckend! Sie glauben es nicht? Wie wäre es, wenn Sie diesen Testbericht über den Fosi-Kopfhörerverstärker lesen und vielleicht ändern Sie Ihre Meinung. The unit is wider and taller than the standard ZA3/ZD3 chassis but the same depth, measuring about 9 3/8" (23. 5mm Headphone port. So, I recently got a Fosi Audio P2 Headphone amp from Amazon on Black Friday, but I've been having issues with the right socket on this amp; first the red LED in the base of the socket stopped working, and now the tube that was plugged in there seems to have burned out prematurely ( it's glowing much brighter while the unit is on ), while the This is the Fosi Audio P1 Tube Preamplifier Mini Hi-Fi Stereo Preamp with 6K4 Valve Vacuum (not for Turntable). Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. com/dp/B07RQTKVM1 Jun 30, 2023 · After the successful launch of our previous mini stereo amplifier, V3, we received significant attention and recognition from members. to/3zLUeNn Thanks to Aiyima for sending me this product for review. A review of the very budget Fosi P2 tube amp. vyryudxkhslfnrilozkvbazbvcumjypcfzxhcaayjjqvvwdiwphmatmxorvgxbjclmecirkculeo