Short answer: both are discontinued, so this only matters if you are buying used. Used, the Boston Acoustics A25 is the better pick: it ranks #59 of 160 bookshelf speakers by sound quality (rated 3.6/5), against #129 (rated 2.5/5) for the JBL Stage A120. If you want one new, the JBL Stage 2 240B replaces the JBL Stage A120 and is rated 2.7/5 at $329.95.
The JBL Stage A120 is the deeper-bass choice. Comes with a port bung, letting you experiment between ported and sealed configurations: the reviewer found the sound improved somewhat with the port sealed. Its bass reaches about 71Hz before falling 3dB, against 90Hz for the Boston Acoustics A25. The catch: A pronounced “Batman”-shaped frequency response: boosted bass, a scooped midrange, and elevated treble (about 3-4dB above the midrange), driven partly by confirmed cabinet panel resonance around 800Hz-1.7kHz.
The Boston Acoustics A25 is the better-sounding option. CEA2034 spinorama is decent once you ignore a peak around 900Hz and a dip around 3kHz: directivity is good enough that the response can be EQed and won’t be too room-dependent. The tradeoff: A crazy port resonance and a tweeter with a steeper rolloff than the woofer both show up in the near-field driver measurements, creating the 900Hz peak and the crossover-region dip.
Buy the Boston Acoustics A25 only if you find one used in good condition; both are discontinued, and it is the better rated of the two. For a new speaker, buy the JBL Stage 2 240B, which replaces the JBL Stage A120.
Want more options? Browse the full Passive Home rankings.
Specifications Side By Side
| JBL Stage A120 | Boston Acoustics A25 | |
|---|---|---|
| Price | $299 per pair Discontinued | $299.98 per pair Discontinued |
| Ranked | #129 of 160 in Medium Size Bookshelf Speakers | #59 of 160 in Medium Size Bookshelf Speakers |
| Drivers | 0.75” tweeter + 5” woofer | 1” Kortec soft dome tweeter, 5.25” ceramic/glass-fiber polymer mid/woofer |
| Weight | 10.6 lbs (4.8 kg) | 10.1 lbs (4.58 kg) each |
| Woofer Cabinet | ported | ported, rear |
| Sensitivity | 83dB (measured, Erin’s Audio Corner) | 85dB (2.83V/1m, measured, Audio Science Review) |
| Impedance | 6 ohms | 8 ohms nominal |
| Dimensions | 11.3”H x 6.8”W x 7.4”D (285.8 x 171.5 x 188.9 mm) | 10.7H x 7.25W x 8.9D in |
| Bass Extension (-3dB) | 71Hz (measured, Erin’s Audio Corner) | 90Hz (measured, Audio Science Review) |
| Bass Extension (-10dB) | 53Hz (measured, Erin’s Audio Corner) | 55Hz (measured, Audio Science Review) |
| Spinorama Preference Score | 3.50 | 3.53 |
| Spinorama Preference Score with Perfect Sub | 6.24 | 6.19 |
| DIY Kit | No | No |
| Frequency Response | - | 55Hz - 25kHz (Manufacturer specified) |
| Power Handling | - | 10-150W recommended |
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The Two Speakers In Full
JBL Stage A120: $299 per pair Discontinued eBay
Newer model: the JBL Stage 2 240B, ranked higher, estimated 2.7/5.
Same family: the JBL Stage A130 (larger bookshelf, ranked lower, rated 2.1/5), the JBL Stage A180 (floorstanding, rated 3.8/5), the JBL Stage A125C (smaller center, rated 3.4/5) and the JBL Stage A135C (larger center, rated 2.9/5).
Pros: Comes with a port bung, letting you experiment between ported and sealed configurations: the reviewer found the sound improved somewhat with the port sealed. Distortion at 96dB is broadly comparable to competitors in this price range outside of some elevated low-end THD. Wide horizontal radiation pattern for a compact bookshelf speaker in the low-to-midrange. Measured bass extension of 71Hz (-3dB), with a measured sensitivity of 83dB.
Cons: A pronounced “Batman”-shaped frequency response: boosted bass, a scooped midrange, and elevated treble (about 3-4dB above the midrange), driven partly by confirmed cabinet panel resonance around 800Hz-1.7kHz. Directivity shows significant back-to-back peaks and dips, making the speaker harder to correct with EQ since the off-axis sound doesn’t track the direct sound cleanly. Elevated treble that some might call “detailed” reads as an unwelcome boost to the reviewer rather than genuine resolution. Compression testing shows the low end degrading substantially at high output (102dB). Overall considered one of the weaker speakers the reviewer has tested in this class, with a competing model (Emotiva Airmotiv B1+) recommended instead at a similar price. Discontinued.
Full JBL Stage A120 review and specifications →
| Bass Extension (-10dB) | 53Hz (measured, Erin’s Audio Corner) |
|---|---|
| Bass Extension (-3dB) | 71Hz (measured, Erin’s Audio Corner) |
| DIY Kit | No |
| Dimensions | 11.3”H x 6.8”W x 7.4”D (285.8 x 171.5 x 188.9 mm) |
| Drivers | 0.75” tweeter + 5” woofer |
| Impedance | 6 ohms |
| Sensitivity | 83dB (measured, Erin’s Audio Corner) |
| Spinorama Preference Score | 3.50 |
| Spinorama Preference Score with Perfect Sub | 6.24 |
| Weight | 10.6 lbs (4.8 kg) |
| Woofer Cabinet | ported |
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Boston Acoustics A25: $299.98 per pair Discontinued eBay
Pros: CEA2034 spinorama is decent once you ignore a peak around 900Hz and a dip around 3kHz: directivity is good enough that the response can be EQed and won’t be too room-dependent. Cabinet fit and finish is well above its price class, and dynamics were strong with no distortion audible even at high volume on well-recorded material. Discontinued, but the reviewer suggests hunting for clearance pricing on remaining stock. Measured bass extension of 90Hz (-3dB), with a measured sensitivity of 85dB.
Cons: A crazy port resonance and a tweeter with a steeper rolloff than the woofer both show up in the near-field driver measurements, creating the 900Hz peak and the crossover-region dip. The rear port itself measured audibly distorted up close, though it wasn’t noticeable from normal listening distance in the reviewer’s room. Discontinued.
Full Boston Acoustics A25 review and specifications →
| Bass Extension (-10dB) | 55Hz (measured, Audio Science Review) |
|---|---|
| Bass Extension (-3dB) | 90Hz (measured, Audio Science Review) |
| DIY Kit | No |
| Dimensions | 10.7H x 7.25W x 8.9D in |
| Drivers | 1” Kortec soft dome tweeter, 5.25” ceramic/glass-fiber polymer mid/woofer |
| Frequency Response | 55Hz - 25kHz (Manufacturer specified) |
| Impedance | 8 ohms nominal |
| Power Handling | 10-150W recommended |
| Sensitivity | 85dB (2.83V/1m, measured, Audio Science Review) |
| Spinorama Preference Score | 3.53 |
| Spinorama Preference Score with Perfect Sub | 6.19 |
| Weight | 10.1 lbs (4.58 kg) each |
| Woofer Cabinet | ported, rear |
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