The JBL 4312M II ranks #145 out of 158 total Medium Size Bookshelf Speakers for sound quality. See all Passive Home rankings for every top pick.
Brand: JBL
Prices on this page were last checked October 7, 2026 at 9:25 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.
As an eBay Partner, we may be compensated if you make a purchase.
#145 JBL 4312M II: $1,000 per pair Discontinued eBay
Pros: A compact three-way JBL studio monitor with a 5.25” white pulp woofer, a 2” midrange, a 0.75” titanium tweeter and level controls. Audio Science Review measured a preference score of -0.32 that reaches 2.99 with an ideal subwoofer, with 0.94 listening window deviation. Measured bass extension of 117.2Hz (-3dB).
Cons: Audio Science Review found a very uneven response (1.66 average on-axis deviation) and limited bass, 117.2Hz (-3dB). JBL no longer sells it. Bass reaches 117.2Hz (-3dB) and about 66Hz (-10dB). Discontinued.
How it compares: Just above it: Polk T15 - $888 cheaper, 1Hz lower bass extension (-3dB). Just below it: Klipsch Reference R-50M - $700 cheaper, 2Hz higher bass extension (-3dB).
| Bass Extension (-10dB) | about 66.0Hz (measured, Audio Science Review) |
|---|---|
| Bass Extension (-3dB) | 117.2Hz (measured, Audio Science Review) |
| DIY Kit | No |
| Dimensions | 11.8”H x 7.1”W x 7.1”D (300 x 181 x 180 mm) |
| Drivers | 5.25” pulp woofer, 2” pulp midrange, 0.75” titanium tweeter |
| Impedance | 6 ohms |
| Sensitivity | 90dB (manufacturer specified) |
| Spinorama Preference Score | -0.32 |
| Spinorama Preference Score with Perfect Sub | 2.99 |
| Weight | 8.8 lbs (4 kg) each |
- Reviews, Comparisons and Sound Samples