The Fosi Audio SP601 ranks #139 out of 157 total Large Size Bookshelf Speakers for sound quality. See all Passive Home rankings for every top pick.
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#139 Fosi Audio SP601: $339.99 per pair Amazon Fosiaudio eBay
Pros: Two-way bookshelf design with a 6.5” paper/aluminum-alloy composite cone woofer and 1.5” silk dome tweeter. Bass reaches a respectable 60-70Hz in most rooms (F3 59Hz, F10 40Hz) for a budget bookshelf speaker. Distortion at 86dB and 96dB measures reasonably well at face value, and compression issues at extreme output are generally in line with what’s expected for a speaker at this price point. The overall tonal character can be substantially improved with basic EQ: the reviewer found a boost around 400Hz plus a cut around 4kHz brought it to an acceptable baseline. Measured bass extension of 59Hz (-3dB), with a measured sensitivity of 85.4dB.
Cons: An unusually erratic, up-and-down frequency response (a scooped midrange followed by an upper-mid bump, a dip, another small bump, then a strong 3-4dB peak around 4-7kHz) makes the speaker’s overall character genuinely hard to characterize: the reviewer compared the experience to a similarly disliked model, the Triangle Borea BR03, which has a comparably inconsistent response. The 4-7kHz peak gives a sharp, sibilant edge to S and T sounds in vocals. A strong diffraction dip around 4kHz followed by a peak can’t be fully corrected with EQ; the reviewer recommends sidewall absorption panels instead, since off-axis energy in the 2-7kHz range actually exceeds the direct sound reaching the listener. Multitone distortion becomes more noticeable and grainy at higher volumes, concentrated in the upper-midrange where hearing is most sensitive. A peaking distortion issue right at the crossover region suggests a possible combination of tweeter distortion and midwoofer/crossover-component strain. The enclosure sounds notably hollow when tapped, and a flashlight inspection suggested a lack of internal damping material, along with likely insufficient bracing. Vertical listening position is fairly tightly constrained around the tweeter axis. Still requires a subwoofer for real kick-drum impact and bass authority.
How it compares: Just above it: HUMAN Speakers 81 DK - $1057 more, 3.6Hz higher bass extension (-3dB). Just below it: Aperion Audio Verus V8B - $1159 more, 0.4Hz lower bass extension (-3dB).
| App | No |
|---|---|
| Bass Extension (-10dB) | 40Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-3dB) | 59Hz (measured, Erin’s Audio Corner) |
| DIY Kit | No |
| DSP | No |
| Dimensions | 14.5”H x 9.1”W x 14”D (368.3 x 231.1 x 355.6 mm) |
| Drivers | 6.5” woofer, 1.5” Silk Dome Tweeters |
| EQ | No |
| Impedance | 4 ohms nominal, 4.1 ohms minimum (measured, Erin’s Audio Corner) |
| Power Handling | 80w RMS Per Speaker |
| Sensitivity | 85.4dB (measured, Erin’s Audio Corner) |
| Weight | 11.5 lbs (5.2 kg) |
| Woofer Cabinet | ported, rear |
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