Short answer: the JBL 4312G. Both are rated 3.9/5 for sound quality (#103 and #95 of [214 bookshelf speakers](/passive/bookshelf-large/#jbl-9.5 lbs (4312 g))), and the JBL 4312G costs $2,500 against $5,599.90 for the JBL L100 Classic MKII, so with nothing between them on sound quality, price settles it.
What the JBL 4312G does well: The current 4312 keeps the three-way layout with a 12” pure pulp woofer, a 5” midrange and a 1” magnesium/aluminium tweeter in a waveguide, with front-firing ports and 90dB sensitivity. The tradeoff: No independent measurements yet, so its tonal balance and directivity can’t be compared directly with measured speakers; the rating is estimated from its measured predecessor.
The case for the JBL L100 Classic MKII: A high-output modern version of JBL’s iconic 1970s monitor, with a 12-inch woofer, dedicated midrange and adjustable mid/treble level controls. Watch for: The response has a moderate -0.30dB-per-octave downward tilt and the bass alignment is somewhat resonant at Q 1.64.
Buy the JBL 4312G. Both are rated the same for sound quality, and it costs $3,099.90 less than the JBL L100 Classic MKII.
About the ratings: the JBL 4312G’s rating is estimated from measured siblings and predecessors rather than its own measurements, with a likely range of 3.6 to 4.2, so this verdict could change once it is measured.
Looking for alternatives? See the complete Passive Home rankings.
Specifications Side By Side
| JBL 4312G | JBL L100 Classic MKII | |
|---|---|---|
| Price | $2,500 per pair | $5,599.90 per pair |
| Ranked | #103 of 214 in Large Size Bookshelf Speakers Estimated | #95 of 214 in Large Size Bookshelf Speakers |
| Drivers | 1” magnesium/aluminium dome tweeter with waveguide, 5” pure pulp midrange, 12” pure pulp woofer | 1” titanium-dome tweeter, 5.25” midrange, 12” pulp-cone woofer |
| Frequency Response | 44Hz-40kHz -6dB (manufacturer specified) | - |
| Sensitivity | 90dB (manufacturer specified) | 90dB |
| Impedance | 6 ohms nominal (manufacturer specified) | 4 ohms |
| Woofer Cabinet | ported (front) | - |
| Dimensions | 23.5”H x 14.3”W x 12”D (597 x 362 x 305 mm) | 25.1H x 15.7W x 14.6D in |
| Weight | 52.5 lbs (23.8 kg) each | 58.9 lbs (26.7 kg) each |
| DIY Kit | No | No |
| Bass Extension (-10dB) | - | about 32.2Hz (measured, Erin’s Audio Corner) |
| Enclosure | - | 3-way, front-ported |
| Country | - | United States (design) |
| Spinorama Preference Score | - | 4.64 |
| Spinorama Preference Score with Perfect Sub | - | 6.59 |
| Bass Extension (-3dB) | - | 50.5Hz (measured, Erin’s Audio Corner via spinorama.org) |
Related Speaker Comparisons
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- KEF R3 vs JBL L100 Classic MKII
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- Klipsch RP-600M II vs JBL L100 Classic MKII
Prices on this page were last checked October 11, 2026 at 4:59 PM 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 4312G: $2,500 per pair Estimated JBL eBay
Older model: the JBL 4312SE (ranked higher, rated 3.9/5). See every JBL 4300 Series generation.
Same family: the JBL 4309 (smaller bookshelf, ranked lower, rated 3.3/5), the JBL 4349 (larger bookshelf, ranked lower, rated 3.6/5), the JBL 4367 (smaller floorstanding, rated 4.6/5) and the JBL 4369 (larger floorstanding, estimated 4.7/5).
Pros: The current 4312 keeps the three-way layout with a 12” pure pulp woofer, a 5” midrange and a 1” magnesium/aluminium tweeter in a waveguide, with front-firing ports and 90dB sensitivity.
Cons: No independent measurements yet, so its tonal balance and directivity can’t be compared directly with measured speakers; the rating is estimated from its measured predecessor. It is 597mm tall and 23.8kg each.
Full JBL 4312G review and specifications →
| Released | Oct 2019 (7 years ago) |
|---|---|
| DIY Kit | No |
| Dimensions | 23.5”H x 14.3”W x 12”D (597 x 362 x 305 mm) |
| Drivers | 1” magnesium/aluminium dome tweeter with waveguide, 5” pure pulp midrange, 12” pure pulp woofer |
| Frequency Response | 44Hz-40kHz -6dB (manufacturer specified) |
| Impedance | 6 ohms nominal (manufacturer specified) |
| Sensitivity | 90dB (manufacturer specified) |
| Weight | 52.5 lbs (23.8 kg) each |
| Woofer Cabinet | ported (front) |
- Links
- Reviews, Comparisons and Sound Samples
- No independent measurement review is linked for this model; it is ranked from hands-on listening and comparison against similarly priced speakers.
- Head-to-Head Comparisons
JBL L100 Classic MKII: $5,599.90 per pair Crutchfield eBay
Older model: the JBL L100 Classic (ranked lower, estimated 3.7/5). See every JBL Classic L Series generation.
Same family: the JBL L82 Classic MkII (smaller bookshelf, ranked higher, estimated 4/5).
Pros: A high-output modern version of JBL’s iconic 1970s monitor, with a 12-inch woofer, dedicated midrange and adjustable mid/treble level controls. Erin’s measurements show excellent 0.152 on-axis smoothness, a tight 2.70 directivity-index deviation, and 41Hz estimated in-room extension. Measured bass extension of 50.5Hz (-3dB).
Cons: The response has a moderate -0.30dB-per-octave downward tilt and the bass alignment is somewhat resonant at Q 1.64. It is very large for a standmount, weighs nearly 59 lb each, and matching JS-120 stands cost extra.
Full JBL L100 Classic MKII review and specifications →
| Released | Dec 2023 (2 years ago) |
|---|---|
| Bass Extension (-10dB) | about 32.2Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-3dB) | 50.5Hz (measured, Erin’s Audio Corner via spinorama.org) |
| Country | United States (design) |
| DIY Kit | No |
| Dimensions | 25.1H x 15.7W x 14.6D in |
| Drivers | 1” titanium-dome tweeter, 5.25” midrange, 12” pulp-cone woofer |
| Enclosure | 3-way, front-ported |
| Impedance | 4 ohms |
| Sensitivity | 90dB |
| Spinorama Preference Score | 4.64 |
| Spinorama Preference Score with Perfect Sub | 6.59 |
| Weight | 58.9 lbs (26.7 kg) each |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons