Short answer: the JBL 305P MKII. It ranks #17 of 100 powered bookshelf speakers by sound quality (rated 4.3/5); the M-Audio BX4 D3 ranks #73 (rated 3.4/5).
The JBL 305P MKII is the more accurate pick. Erin’s Klippel data gives 5.38 standalone and 7.52 with an ideal subwoofer, with bass reaching -3dB around 51Hz. Its measured preference score, a predictor of how neutral it sounds, is 5.38 against 3.29 for the M-Audio BX4 D3. Watch for: The 3.3dB midrange span and rising response show it is not perfectly neutral.
The case for the M-Audio BX4 D3: Balanced TRS, RCA and front auxiliary/headphone connections, plus tone controls, make this a flexible inexpensive desktop pair. It keeps a wired aux input, which the JBL 305P MKII lacks. The tradeoff: A rising response of about 0.62dB per octave and listening-window deviation of 0.546 indicate bright, locally uneven reproduction.
Buy the JBL 305P MKII. It is rated higher for sound quality than the M-Audio BX4 D3.
Looking for alternatives? See the complete Powered Home rankings.
Specifications Side By Side
| JBL 305P MKII | M-Audio BX4 D3 | |
|---|---|---|
| Price | $289.00 per pair | - |
| Ranked | #17 of 100 in Medium Size Powered Bookshelf Speakers | #73 of 100 in Medium Size Powered Bookshelf Speakers |
| Dimensions | 11.7”H x 7.3”W x 9.1”D (297.2 x 185.4 x 231.1 mm) | 8.9H x 6.1W x 6.9D in |
| Frequency Response | 49 Hz - 20 kHz (+-3 dB) (Manufacturer specified) | 69Hz - 22kHz (Manufacturer specified) |
| Bass Extension (-3dB) | 50Hz (measured, Erin’s Audio Corner) | - |
| Bass Extension (-10dB) | 43Hz (measured, Erin’s Audio Corner) | - |
| Inputs | XLR, TRS | TRS, RCA, 3.5mm aux; headphone output |
| Weight | 10.4 lbs (4.7 kg) each | 9.7 lbs (4.4 kg)/pair |
| Drivers | 5” (127mm) woofer | 1” dome tweeter, 4.5” Kevlar woofer |
| App | No | - |
| Bluetooth | No | No |
| EQ | Yes (Room adjustment) | - |
| Amplifier Power | 81w Per Speaker | 120W peak system |
| Sensitivity | 91.1dB (measured at 0.3V/1m, Erin’s Audio Corner) | - |
| Spinorama Preference Score | 5.38 | 3.29 |
| Spinorama Preference Score with Perfect Sub | 7.52 | 6.03 |
| XLR Input | Yes | No |
| RCA Input | No | Yes |
| TRS Input | Yes | Yes |
| Optical Input | No | No |
| Coaxial Input | No | No |
| USB Input | No | No |
| HDMI Input | No | No |
| AES Input | No | No |
| Aux Input | No | Yes |
| Enclosure | - | 2-way powered stereo pair, rear-ported |
Related Speaker Comparisons
How JBL 305P MKII compares with other leading options:
- Genelec 8331A vs JBL 305P MKII
- JBL 305P MKII vs Neumann KH120 MKII
- Genelec 8030C vs JBL 305P MKII
- JBL 305P MKII vs Neumann KH80 DSP
- JBL 305P MKII vs Reflector Audio Square Two
Prices on this page were last checked October 9, 2026 at 8:01 AM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.
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The Two Speakers In Full
JBL 305P MKII: $289.00 per pair Amazon eBay
Older model: the JBL LSR305 (ranked lower, rated 4.2/5).
Same family: the JBL 306P MKII (larger bookshelf, rated 4.1/5) and the JBL 308P MKII (larger bookshelf, rated 4.4/5).
Pros: Erin’s Klippel data gives 5.38 standalone and 7.52 with an ideal subwoofer, with bass reaching -3dB around 51Hz. Broad horizontal coverage and reasonably smooth reflected sound support stable imaging across a desk. The existing review reports effective limiting and little sustained thermal compression, making it a strong budget-monitor option rather than just a speaker with a promising frequency curve. Measured bass extension of 50Hz (-3dB), with a measured sensitivity of 91.1dB.
Cons: The 3.3dB midrange span and rising response show it is not perfectly neutral. A port-related feature around 1.6kHz and some excess treble can be audible; the review recommends the treble-trim switch. Vertical crossover interference makes ear height important. Amplifier hiss may matter in very quiet nearfield use, and rear-port placement needs room-boundary adjustment.
Full JBL 305P MKII review and specifications →
| AES Input | No |
|---|---|
| Amplifier Power | 81w Per Speaker |
| App | No |
| Aux Input | No |
| Bass Extension (-10dB) | 43Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-3dB) | 50Hz (measured, Erin’s Audio Corner) |
| Bluetooth | No |
| Coaxial Input | No |
| Dimensions | 11.7”H x 7.3”W x 9.1”D (297.2 x 185.4 x 231.1 mm) |
| Drivers | 5” (127mm) woofer |
| EQ | Yes (Room adjustment) |
| Frequency Response | 49 Hz - 20 kHz (+-3 dB) (Manufacturer specified) |
| HDMI Input | No |
| Inputs | XLR, TRS |
| Optical Input | No |
| RCA Input | No |
| Sensitivity | 91.1dB (measured at 0.3V/1m, Erin’s Audio Corner) |
| Spinorama Preference Score | 5.38 |
| Spinorama Preference Score with Perfect Sub | 7.52 |
| TRS Input | Yes |
| USB Input | No |
| Weight | 10.4 lbs (4.7 kg) each |
| XLR Input | Yes |
- Links
- Reviews, Comparisons and Sound Samples
- Erin’s Audio Corner Review Measurements More from Erin’s Audio Corner →
- Audio Science Review Measurements More from Audio Science Review →
- Erin’s Audio Corner: LIVE! JBL 305P MkII Powered Studio Monitor Review
- DSAUDIO.review: DSAUDIO.review Focal Alpha 50 EVO vs JBL 305P MKII sound.DEMO More from DSAUDIOreview →
- DSAUDIO.review: JBL 305P MKII vs Yamaha HS5 6-Track Comparison
- DSAUDIO.review: DSAUDIO.review JBL 305P MKII vs KRK Classic 5 CL5G3 sound.DEMO
- DSAUDIO.review: JBL 305P MKII vs Adam Audio T5V 6-Track Comparison
- DSAUDIO.review: DSAUDIO.review Adam Audio A5X vs JBL 305P MKII sound.DEMO
- DSAUDIO.review: DSAUDIO.review Kali Audio LP-6 V2 (2nd Wave) vs JBL 305P MKII sound.DEMO
- DSAUDIO.review: DSAUDIO.review Edifier MR4 vs JBL 305P MKII sound.DEMO
- DSAUDIO.review: Kali Audio IN-5 vs JBL 305P MKII Sound & Frequency Response Comparison
- DSAUDIO.review: JBL 308P MKII vs JBL 305P MKII Sound & Frequency Response Comparison
- DSAUDIO.review: Neumann KH80 DSP vs JBL 305P MKII Sound & Frquency Response Comparison
- DSAUDIO.review: JBL 305P MKII vs PreSonus Eris E5 6-Track Comparison
- Erin’s Audio Corner Measurements (spinorama.org)
- Jasper Tech: Best Desktop Computer Speakers for Every Budget – 2026 More from Jasper Tech →
- Jasper Tech: Best Powered Bookshelf Speakers for Every Budget - 2025
- Jasper Tech: Are the iLoud Micro Monitor Pro the Best Studio Monitor Speakers for your Home Studio?
- Head-to-Head Comparisons
- JBL 305P MKII vs KEF LS50 Wireless II
- JBL 305P MKII vs Klipsch The Fives
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- JBL 305P MKII vs Genelec 8020D
- JBL 305P MKII vs IK Multimedia iLoud MTM MKII
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- See all 66 comparisons
M-Audio BX4 D3 eBay
Same family: the M-Audio BX5 D3 (larger bookshelf, ranked higher, rated 3.9/5) and the M-Audio BX8 D3 (larger bookshelf, rated 4/5).
Pros: Balanced TRS, RCA and front auxiliary/headphone connections, plus tone controls, make this a flexible inexpensive desktop pair. The third-party measurement gives scores of 3.29 standalone and 6.03 with an ideal subwoofer, with -3dB bass estimated around 67Hz.
Cons: A rising response of about 0.62dB per octave and listening-window deviation of 0.546 indicate bright, locally uneven reproduction. The compact system suits moderate nearfield use; the preference estimate does not verify high-level headroom.
Full M-Audio BX4 D3 review and specifications →
| AES Input | No |
|---|---|
| Amplifier Power | 120W peak system |
| Aux Input | Yes |
| Bluetooth | No |
| Coaxial Input | No |
| Dimensions | 8.9H x 6.1W x 6.9D in |
| Drivers | 1” dome tweeter, 4.5” Kevlar woofer |
| Enclosure | 2-way powered stereo pair, rear-ported |
| Frequency Response | 69Hz - 22kHz (Manufacturer specified) |
| HDMI Input | No |
| Inputs | TRS, RCA, 3.5mm aux; headphone output |
| Optical Input | No |
| RCA Input | Yes |
| Spinorama Preference Score | 3.29 |
| Spinorama Preference Score with Perfect Sub | 6.03 |
| TRS Input | Yes |
| USB Input | No |
| Weight | 9.7 lbs (4.4 kg)/pair |
| XLR Input | No |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons