Pro-Ject Speaker Box 5 Review: Small Cabinet, Surprisingly Big Sound

Introduction

The Pro-Ject Speaker Box 5 is a compact two-way passive bookshelf speaker that sells for around $350. It arrives in red, white or black, and this evaluation focused on the white version. On paper it looks like a lifestyle speaker: a small glossy cabinet with a five inch woofer, a one inch soft dome tweeter and a rear port. In practice it plays considerably bigger than its dimensions suggest, and that gap between expectation and result is what makes it worth a closer look.

Who This Product Is For

At 6.3 inches wide, 10 inches high and 8.2 inches deep, the Speaker Box 5 is genuinely small. That makes it a natural fit for desktops, small rooms and apartments where a floorstanding pair simply will not work. It also suits listeners who value clarity and detail over a warm, forgiving presentation, and who are willing to pair a compact speaker with an amplifier that can drive a modest load.

The size also works in its favour in a larger room. Because the cabinet is light and easy to move, you can pull the speakers a good distance out from the front wall, and that positioning helps the soundstage open up in a way a bigger cabinet rarely allows. If deep, room-filling bass is a priority, plan on adding a subwoofer, because the rated response reaches down to 55 Hz rather than into true low-bass territory.

Main Strengths

The overall character here is clarity first. Across several listening sessions the speaker kept a tight grip on detail, produced a wide and well-defined image, and never sounded confused even when pushed harder than its price and size would suggest.

Soundstage and Imaging

With the speakers placed roughly eight feet apart and the listening position about ten feet back, the presentation was noticeably three-dimensional. Instruments had a clear location inside and between the speakers, centre imaging was strong, and the soundstage extended well beyond the physical cabinets. Part of that comes down to how easy these are to position: because they are so compact, they can sit well clear of the wall behind them without dominating the room.

In a large room, which is a demanding test for a speaker this size, the pair held together at around 85 dB at that listening distance. Volume capabilities are respectable for the cabinet volume on offer.

Bass Response and Room Size

The five inch woofer does more work than the spec sheet implies. On a track with a heavy, sustained bass line, the speaker reproduced it with visible excursion, clean tone and believable texture rather than a thin approximation. There is a modest physical sense of bass in the room, enough to register on a hard surface nearby. What it does not do is dig deep or hit with real authority, and on bass-heavy material the low end stays politely contained rather than dominant. The rated range of 55 Hz to 20,000 Hz describes that behaviour accurately.

Midrange and Treble Character

Midrange performance is detailed and very clear, but it leans cool rather than warm. Male vocals came across slightly cool in character, and there was only mild sibilance on passages that often expose it. As volume rises, the midrange moves forward, so listeners who prefer a relaxed, laid-back presentation should take note. Treble is the standout: brushwork on a ride cymbal sounded organic and natural, and a sharp cymbal crash came through cleanly without glare. The tweeter and woofer blend smoothly, which is a large part of why the speaker sounds as coherent as it does.

In near-field use the pair reached around 90 dB before turning shouty and beginning to smear complex passages. That is a high ceiling for a speaker in this class, and it means normal listening levels sit comfortably inside the speaker’s comfort zone.

Things to Consider Before Buying

The glossy cabinet finish shows fingerprints readily, so anyone who dislikes keeping a cloth nearby should factor that in. Sensitivity is rated at 86 dB, which is on the low side, though in practice the speaker was driven without difficulty by a range of amplifiers, including a home theatre receiver rated at 50 watts into 8 ohms and a compact desktop amplifier with far less power on tap. The nominal rating of 4 to 8 ohms means it will likely dip toward 4 ohms, so a stable amplifier is a sensible match.

Tonally, this is not a warm speaker. If you are looking for a soft, forgiving midrange, the Speaker Box 5 will not deliver it. Bass extension is also limited by the cabinet size, so a large room will need a subwoofer to feel complete. Availability is another practical point: this is not a model you will find in every store, so it is worth confirming stock before committing.

Buying Advice

At $350 the Speaker Box 5 represents solid value. The build is reassuring, with threaded inserts on the rear panel, a rear port, sturdy binding posts and substantial magnetic grilles, and the front baffle carries a genuinely thick layer of material. The cabinet feels heavier and better finished than the price suggests, and the sound quality backs that up.

The clearest way to decide is by tonal preference and room size. Choose it if you want detail, clarity and an unusually large soundstage from a very small cabinet, and if you are comfortable pairing it with a subwoofer in a bigger space. Look elsewhere if warmth and deep bass are your priorities, or if you listen at very high levels in a large room for long stretches.

Conclusion

The Pro-Ject Speaker Box 5 is one of those rare small speakers that makes you rethink what a compact cabinet can do. It images beautifully, keeps treble clean and natural, and its five inch woofer punches well above its price class. The trade-offs are honest ones: a cool tonal balance, limited low-end extension and a glossy finish that shows every touch. At $350, for listeners who value clarity and a big soundstage over warmth, it is an easy recommendation.