Z Reviews Talks Fosi Audio SP601: “Actually Actively Good!”

When a seasoned audio reviewer like Zeos Pantera of Z Reviews puts a pair of brand-new passive bookshelf speakers under the spotlight, you know the results are going to be unfiltered, brutally honest, and—occasionally—hilariously off-the-wall. That’s exactly what we got in his review of the Fosi Audio SP601, our debut entry into the speaker world.

This wasn't just a typical review—it was a full-on journey through build quality, brand perception, audio performance, and competitive value. And the final takeaway? Despite some reservations about price and aesthetics, Zeos was genuinely impressed by how good these speakers sound.

Fosi Audio's First Speaker—And It Sounds Phenomenal

Z Reviews opens with his signature candid energy, but quickly dials into what matters most: the sound. Connecting the SP601 to $4,000+ amplification gear, he skipped Fosi’s own ecosystem just to evaluate them in isolation.

“I’m kind of shocked… this might be the best first effort speaker I’ve ever heard.”

He described the SP601's sound as delicate, direct, and demure—soft yet forward, with a wide imaging arc and impressive detail.

A Sonic Surprise

While Zeos wasn’t sold on the price out of the gate, he didn’t hold back on praise for the performance:

Imaging: Spectacular, with layered depth and smooth dispersion
Tweeter integration: “Not too harsh, not too bass-light”
Tone balance: Soft dome tweeter adds warmth without losing detail
Volume handling: Clear and controlled, even at high SPL
Soundstage: Fills the room with a satisfying, “washed-in” presentation

“If I judged these blind—no price, no branding—I’d absolutely believe they were $500 speakers.”

Critique Where It Counts

Zeos wasn’t shy about areas for improvement, particularly in design and market positioning:

Only available in white, with a large minimalist form factor
He wanted a bit more styling flair—maybe even custom color options

But despite these cosmetic concerns, the sound quality carried the day.

“They’re kind of boring looking… but they sound amazing.”

Smart Choices Behind the Scenes

The SP601 features:

A 6.5-inch woofer paired with a soft-dome tweeter
A large, flared rear port (which Zeos dubbed “a tight three-finger port”) that allows real bass extension
Frequency response down to a claimed 44Hz, with real-world performance that impressed him—especially once paired with a subwoofer

Paired with a Subwoofer = Home Theater Worthy

Adding a sub elevated the SP601 even further. In his words:

“Once the sub kicks in... you could tell me these cost $1,000 and I wouldn't blink.”

This sparked an idea: what if Fosi introduced their own matching subwoofer? Zeos called for it—and even envisioned a powered version of the SP601, integrating Fosi’s existing amp tech for a complete all-in-one solution.

Final Verdict: “Fosi Audio Deserves Respect”

While Z Reviews won't blindly endorse any first effort, the SP601’s sound quality left a strong impression. Zeos was refreshingly honest:

He concluded that although Fosi still has ground to cover in building speaker brand recognition, this debut effort earns genuine respect. As he put it:

“This is way better than I thought it would be.”