Introduction

Previously, I reviewed the Fosi Audio K5 Pro, and unfortunately, I couldn’t recommend it due to technical issues and overall unreliability. However, I saw great potential in this brand and looked forward to future releases.

That brings us to the Fosi Audio K7. Is this a dramatic improvement over the K5 Pro? Is it worth buying?

Let’s find out in this review, where I’ll analyze its design, features, sound quality, power output, pricing, and more.

What is the Fosi Audio K7?

Fosi Audio K7 is a Gaming Headphone Amplifier + DAC (Digital-to-Analog Converter) + Preamplifier all in one. It requires no drivers, connects to your PC or gaming console via USB, and the preamp section allows you to hook it up to active speakers for greater flexibility.

DAC/Amp combos like the K7 offer convenience, eliminating the need to purchase separate components, making it an efficient and space-saving solution for any setup.

Build Quality & Design

Compared to the K5 Pro, the K7 has a more professional design, weighing 536g, which gives it a sturdy and durable feel. One standout feature is that the controls are placed on top instead of the front, making it much easier to operate.

• LCD Display: Clearly shows audio settings and modes.

• Multi-function Control Knob: Adjusts volume, bass, treble, and microphone settings.

• Well-Arranged Ports: Includes RCA outputs, Bluetooth antenna, coaxial input, optical input, USB-C, and DC 12V power input.

Features & Connectivity

The Fosi Audio K7 supports multiple connectivity options, making it a versatile device:

• Game on PS4/PS5 via Optical Input

• Wireless Music Streaming via Bluetooth

• Balanced Audio Listening via 4.4mm Output

• Output to Active Speakers like the FiiO SP3

• Customize Sound with Bass/Treble Adjustments

A great addition is the included splitter, something missing from competitors like the Creative G8.

Sound Performance

The Fosi Audio K7 can easily power most headphones from 16-300Ω with an output of 2.1W+2.1W, delivering a 121dB Signal-to-Noise Ratio (SNR)—far exceeding the 90dB SINAD standard for clean and distortion-free audio. This ensures crystal-clear sound for gaming, music, mixing, movie-watching, and more.

The treble boost feature is a nice touch for adding extra sparkle when needed. While I don’t usually use bass enhancements, I’d love to see a mid-range adjustment in future models, as mids are crucial in audio reproduction.

Final Verdict

I’m thrilled to see how much Fosi Audio has improved with the K7. This is a massive upgrade over the K5 Pro, showing that the company took feedback seriously.

If you’re a gamer, music lover, producer, streamer, film enthusiast, audiophile, or tech nerd, the K7 is definitely worth considering.

🔥 Fosi Audio K7 – A Worthy Upgrade and an Easy Must-Buy!

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Unboxing the Fosi Audio P4 Solid-State Preamplifier: First Impressions

Introduction

At last! The Fosi Audio development team has kindly sent me a release sample of the new P4 preamplifier in mid-December. I had been advocating for this type of preamplifier for quite some time, as it serves as an ideal companion for last year’s V3 stereo amplifier and other Fosi products. Seeing this product come to life is exciting for Fosi users.

The preamplifier was provided to me for free, and the following is my honest, unbiased review. I have not been paid for my opinions, and while I do not have measurement equipment, I hope Amir will test this unit soon.

About Me

I am a typical audio enthusiast based in the Midwest, USA, with a collection of vintage, restored, and modern audio equipment. I love mixing and matching old and new components to achieve the sound and aesthetic I desire in my 1916 home, which consists of multiple small rooms and, therefore, various audio setups.

Most of my amplifier needs range up to 100W per channel at 8 ohms, and I primarily listen at low to moderate volumes. I use diverse audio sources, including streaming/DAC, phono, cassette tape, CD, and occasionally FM radio. While I appreciate single-input Class D amplifiers, switching inputs manually can be tedious. A quality preamplifier with multiple inputs and a phono preamp is a game-changer for me.

I don’t use balanced (XLR) connections since my cable runs are short. Additionally, I avoid tube-based components due to their harmonic distortion, preferring a clean, accurate sound at a reasonable cost.

The Rise of Compact Class D Amplifiers

Affordable Class D amplifiers have been transformative for my audio setup. My goal is to maintain a simple, compact system with low to mid-volume output. I currently use Class D amplifiers from Fosi, Aiyima, and SMSL in various rooms. A reliable RCA preamplifier with multiple inputs would greatly enhance my setup.

Enter the Fosi Audio P4

The P4 is exactly what I envisioned—a clean, solid-state preamp that pairs well with the V3 stereo amp and other Class D amplifiers. Fosi continues its minimalist design philosophy, with a sleek metal chassis, minimal labeling, and an optional copper volume knob for a unique touch.

Physically, the P4 is slightly larger than the V3 amp, measuring 4.5 inches wide—just 0.25 inches wider than the V3—making them easy to stack. I prefer placing them side by side, as shown in my photos.

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Key Features

• Tone Controls: The front panel includes bass and treble adjustments with a ±12dB range, plus a tone defeat switch at the back.

• Gain Control: The rear panel features a gain switch (1V, 2V, or 4V), corresponding to +3dB, +6dB, or +9dB levels.

• Pre-Out Jack: Likely for a powered subwoofer, though the manual provides no guidance on this.

• Remote Control: The ergonomic remote can control multiple Fosi products (ZD3, ZP3, BT20A MAX, and P4). It includes power, mute, volume, track selection, mode switching, and reset buttons. It requires two AAA batteries (not included).

• Power Supply: A compact DC 12V 1.5A power adapter connects via a barrel plug.

The remote is convenient for powering the unit and adjusting the volume. While manual control is possible via the volume knob, the remote makes operation seamless.

Sound Quality

In a word—excellent! The P4 delivers impressive performance with a signal-to-noise ratio (SNR) of 110dB+, total harmonic distortion (THD) of 0.003%, a low noise floor (~9µV), and 103dB+ crosstalk.

At the lowest gain setting, the P4 significantly boosts the V3 amp’s sound. At maximum gain, it reaches very high volume levels. My preferred setup includes the P4 at 50% volume and the V3 at 75%, using KEF Q 15.2 speakers (91dB efficiency). Tracks play at 75–85dB in nearfield listening (1.5 meters from the speakers), with no audible noise or hiss.

The tone controls are effective, allowing me to fine-tune the bass and treble without needing an external EQ. This feature is invaluable for adjusting sound at lower volumes, similar to the vintage “loudness” circuit found in older equipment.

Despite its small power brick (18W), the P4 remains cool, even after hours of playback. My music preferences span jazz, blues, rock, folk, electronic, and classical, and the P4 delivers great clarity across all genres.

Pros and Cons

Pros:

• Premium Build: Matches Fosi’s amplifier lineup aesthetically, including the stylish copper knob.

• User-Friendly Remote: Allows easy input selection and volume adjustments.

• Strong Power Boost: Adjustable gain settings offer flexibility.

• Convenient Tone Controls: Includes a tone defeat switch for purists.

• Minimal Noise: Excellent sound quality with no noticeable interference.

• Competitive Pricing: While the price is undisclosed, it’s expected to be a great value compared to alternatives like the Schiit Saga 2 ($279).

Cons:

• Pre-Out Jack Mystery: The manual lacks information on its intended use.

• Flimsy Gain Switch: Feels delicate, potentially impacting durability with frequent use.

• Tight Knob Spacing: The bass and treble knobs are very close to the volume control, making adjustments tricky.

• No Passive Gain Mode: Unlike Schiit’s Saga 2, the P4 lacks a 0dB gain option.

• Remote Volume Sensitivity: Low-volume control lacks fine adjustment, requiring manual tuning on the amp.

• No Headphone Jack: A missed opportunity for added versatility.

• No Built-In Phono Preamp: Users need a separate phono preamp.

• Another Power Brick: While compact, an internal power supply would have been preferable.

Minor Nitpicks:

• The remote’s mute button is close to the power button, leading to accidental presses.

• The V3 amp has a blue LED, while the P4 has a red/orange LED—standardizing colors would enhance visual coherence.

• Rear RCA jack spacing is tight for wider connectors.

Final Thoughts

The Fosi P4 is a well-designed, practical preamplifier that fills a crucial gap in the market. It’s an excellent match for Fosi power amps, particularly for those using multiple RCA sources without a legacy preamp. Three inputs are sufficient for most users, covering a phono preamp, CD player, and DAC/streaming setup.

This preamp aligns with the minimalist trend in Class D amplifiers—compact, affordable, and high-performing. The era of bulky, expensive audio gear is fading, making room for small yet powerful components that sound fantastic. It’s a great time to be an audio enthusiast!

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Finding a quality electric bike under £700 can be tough, as many budget options come with compromises like limited battery range and lower-end components. However, with recent price drops and improved specifications, affordable e-bikes are getting better. The Hitway BK6S is a foldable step-through electric bike designed to meet the needs of daily riders without exceeding the budget.

Hitway, a well-known Chinese brand specializing in budget-friendly e-bikes, offers the BK6S at a competitive price of £699. This model packs a solid feature set, including a foldable step-through frame, integrated lights, mudguards, and a 250W motor powered by a 432Wh battery for a decent range.

Adding to its versatility, the BK6S even includes a padded seat on the pannier rack, allowing for a small pillion passenger—more on that later.

The Hitway BK6S test bike arrived quickly and securely packaged. It was delivered folded in a large yet manageable box, requiring only minimal assembly. Inside the package, we found an instruction manual, battery charger, essential tools, and a tyre pump. Charging the battery from empty to full took approximately four hours.

The Ride

For my first test, I took the Hitway BK6S on a 10-mile loop through local lanes. Right away, the bike felt familiar—the display, gear shifter, and saddle are similar to those found on other e-bikes I’ve tested. Even the 250W motor exhibited the usual slight delay in pedal assist, which can be a bit frustrating. However, once engaged, the power delivery felt smooth and controlled, making for a comfortable ride.

Power & Climbing Performance

The Hitway BK6S offers three power settings, each with different maximum assisted speeds: 9mph, 12mph, and 15mph. Holding down the minus button activates the 6km/h walk assist mode, which can be useful for pushing the bike uphill.

Riding beyond the assistance limit or without power requires significant effort, likely due to the bike’s weight and rolling resistance from the large tyres, rather than motor drag.

My test route included several long, gradual climbs, averaging 6% over a few miles. The 250W motor handled these inclines well, making the ascent comfortable. However, a steeper 20% section towards the end of the ride proved to be a challenge. Even with a good level of cycling fitness, I struggled—less experienced riders may need to dismount and use walk assist for such steep inclines.

At 28kg, the Hitway BK6S is on the heavier side, but it handles surprisingly well on the road. Its predictable steering and stable tracking make it easy to navigate through high-speed corners, while at lower speeds, manoeuvring through obstacles on cycle paths is effortless. The 3-inch tyres contribute to both low- and high-speed stability, offering a noticeable improvement over the bulkier 4-inch tyres commonly found on budget e-bikes.

The adjustable handlebars and ample seatpost range allow for a customizable riding position, making the Hitway fairly comfortable for most riders. However, the large cushioned saddle wasn’t ideal for me—despite its plush padding, it caused discomfort in the backs of my thighs after a few miles, a common issue with oversized saddles.

Suspension & Ride Quality

The front suspension fork absorbs smaller potholes well but struggles with larger obstacles like speed bumps. Meanwhile, the suspension seatpost provides some comfort on smooth roads, but on bumpier country lanes, it felt more like a pogo stick, bouncing me up and down.

After my first ride, I found that the Hitway BK6S performs best on flatter terrain, making it an ideal urban commuter e-bike. Over 10 miles, with the highest assist level engaged and 1,000 feet of climbing, the battery lost two out of five bars, which is reasonable for these conditions.

Specification

The Hitway BK6S features an aluminum step-through frame with a stealthy matte black finish and contrasting green decals. The overall build quality is solid, with neat welds giving it a polished look. However, internal cable routing is absent, leaving a cluster of coiled cables running along the underside of the frame.

Powering the bike is an unbranded rear hub motor, which feels and sounds like many others I’ve tested. It lacks standout features but gets the job done. As mentioned earlier, the cadence-based pedal assist has a noticeable delay, making hill starts and junction pull-aways tricky. Additionally, there’s no throttle, so riders must account for the slight lag when navigating traffic.

The S866 display, a common choice for budget e-bikes, offers decent functionality and is clear and easy to read, ensuring a user-friendly experience.

Battery, Brakes & Components

The Hitway BK6S is powered by a 432Wh removable battery, mounted vertically behind the seatpost. While the specific cell type is unknown, it does come with EU safety certification. The claimed 56-mile range seems optimistic for real-world conditions. In my test, I was down to one bar after 24 miles, which, considering my weight and hilly terrain, is reasonable. Removing the battery requires flipping the hinged saddle catch, and an unusual design quirk means that once the battery is locked in place, the key cannot be removed—a common trait in many budget e-bikes.

Braking & Gearing

The mechanical disc brakes and Shimano Tourney 7-speed gearing are standard for entry-level e-bikes. The gears needed minor adjustments out of the box, and the 14-28T freewheel provides a limited range, best suited for moderate inclines. While the brakes worked, they felt vague and pulsed under pressure. For better performance, I’d recommend upgrading to Clarks Clout hydraulic brakes (~£45), which would significantly improve stopping power.

Wheels & Tyres

The six-spoke alloy mag wheels eliminate concerns about broken spokes, but they do add weight to the bike. The 20-inch x 3-inch unbranded tyres strike a balance between regular and fat tyres, offering decent grip and ride comfort. While I had no issues during testing, some Amazon reviews mention weak puncture resistance. That said, the overall ride quality and grip were satisfactory.

Suspension & Accessories

The Hitway BK6S features dual suspension, but with limitations. Up front, the lockable coil-sprung fork does an okay job on rough roads, though it clatters when riding down steps or curbs. At the rear, there’s no true suspension, only a sprung seatpost, which creates a bouncy ride but still transfers road bumps to the rider.

When it comes to accessories, the Hitway BK6S is well-equipped. It includes metal full-length mudguards, front and rear lights, a kickstand, and a pannier rack seat. While I briefly carried my nine-year-old daughter at low speed, this is not a true cargo bike. The bike lacks foot pegs and a protective barrier to keep feet away from the rear wheel. The built-in seat is more of an afterthought, and I’d only recommend short, low-speed rides. If you plan to carry a passenger, installing a proper seat would be a much safer option.

Comfort & Sizing

The Hitway BK6S offers ample adjustability in both the seatpost and handlebar height, making it suitable for a wide range of riders. My 11-year-old daughter, who is just over 5ft, can ride it comfortably, and at 6ft, I also had no issues. However, the suspension seatpost sags by about an inch when seated, so riders should account for this when adjusting their ideal height.

The riding position is relaxed, making it a comfortable choice for urban commutes. However, despite the large tyres, cushioned saddle, and suspension seatpost, the rear end still feels somewhat harsh, especially on rougher roads.

Folding & Transportation

Folding the Hitway BK6S is simple and quick with a bit of practice. The handlebar folds inward, and the frame folds at the center, making it more compact for storage or transport. While the folding clamps have a basic, utilitarian design, they are functional and secure, with no noticeable play in the folding joints

Portability & Storage

Once folded, the Hitway BK6S is quite heavy and bulky, requiring a fair amount of strength to carry. If you have any back issues, I wouldn’t recommend lifting it. Its size and weight make it awkward to maneuver, meaning it’s not ideal for crowded public transport. However, it should fit in a hatchback or estate car with the rear seats folded down.

Verdict

Setting aside e-bike purist expectations, the Hitway BK6S delivers solid performance for its price. At under £700, it’s a practical and affordable commuting option. While it’s heavy, offers a somewhat harsh ride, and struggles on steep hills, these drawbacks are forgivable if you're looking for simple, budget-friendly transportation. Despite challenging weather conditions, the BK6S has proven to be reliable throughout the testing period, making it a great choice for everyday commuting.

https://hitway.eu

Obviously, algorithms aren’t as good as Van Gogh, Monet, Kahlo — but anyone could be fooled to believe that an AI artwork is made by them. It’s an interesting but unsettling thought, especially with deepfakes making waves in the news lately. So, the real challenge is identifying whether an image came from a human or a machine.

How do we do that exactly?

From subtle nuances to distinct styles, I’ll go over some tips I've figured out after working with these tools for months. Some are obvious telltale signs of AI while others are a bit harder to figure out.

Students have been using ChatGPT to cheat their way to higher grades. This has led to the development of AI detectors, which proved to be a good band-aid solution for some educators. But there’s a different side to this. Something that I believe is widely overlooked, but is equally worth talking about.

What happens if you’re falsely accused of using AI? More importantly, why does that happen and what can you do about it? All that, and more, in this article.

The Rise of AI Detection Tools

With the rise of ChatGPT came a pressing question, “how can we separate human writing from AI writing?” And the answer came in the form of AI detection tools.

Two of the earliest AI detectors in the market are OpenAI’s Classifier and TurnItIn. The former was discontinued because of its low accuracy while the latter’s still hanging on for better or worse, but we’ll get to that later.

Today, there’s no shortage of AI detection tools, free or otherwise. You’ve got the staples like Copyleaks, GPTZero, and Originality. Then you’ve got the worthy challengers like Sapling, Content At Scale, and Crossplag. There’s just so many of them that I can’t help but wonder…

This discovery has raised eyebrows in the tech community, particularly because these files can be accessed simply by literally asking the GPT.

Custom GPTs, introduced as a part of the GPT Plus service, are a game-changer in the world of chatbots. They allow creators to feed them with specific data, like product details, customer information, or web analytics, providing more tailored and accurate responses.

While this seemed like a boon for personalized AI interactions, a potential privacy issue has been concerning many.

Reports and tweets, including one about Levels.fyi, a salary analysis platform, have highlighted a concerning aspect of these Custom GPTs – they can share the files uploaded by their creators upon request.

What's more, obtaining these files is as easy as asking the chatbot to present them for download.