LF Components
Designed not only to deliver, but to thrive on today’s pushed-to-the-max soundtracks, QSC low-frequency components bring out the full richness of screen channel sound. Unlike re-purposed rock and roll PA cabinets, our LF components are built from the ground up with cinema-specific details that speed up installation. For example, offset terminal cups and pre-installed rubber feet.
We also enhance performance with smart design by using tight driver spacing in our multi-driver boxes to improve coupling and widen coverage angles. LF components are the foundation of full, clear screen channel sound, and nobody builds better screen channel enclosures than QSC.
1 Driver Models
| Model | LF-3115 | LF-4115 |
| System Models | 2-way: SC-312XC | 2-way: SC-412C |
| Driver Information | 15" (381 mm) | 15" (381 mm) |
| Impedance | 8Ω | 4Ω |
| Rated Noise Power1 | 400 W RMS | 500 W RMS |
| Sensitivity2 | 95.5 dB | 95.5 dB |
| Dimensions (HWD) inches | 18.63 x 30 x 20.25 | 18.63 x 30 x 20.25 |
| Dimensions (HWD) mm | 473.2 x 762 x 514.4 | 473.2 x 762 x 514.4 |
1 2 hours of 6 dB crest factor pink noise, AES method.
2 Based on nominal impedance, measured in half space 1 W @ 1 m.
LF components connect with barrier strip screw terminals that accept up to #10 AWG stranded wire except for LF-4215-8F, which uses Neutrik Speakon™ NL4.
2 Driver Models
| Model | 2150-LF | LF-4215 | LF-4215-8 | LF-4215-F | LF-4215-8F |
| System Models | 3-way: SC-2150 | 2-way: SC-422C | 3-way: SC-423C-8 | 3-way: SC-423C-F | 4-way: SC-424-8F |
| Driver Information | 15" (381 mm) high-efficiency, extended bass woofer, 3" copper voice coil | 15" (381 mm) | 15" (381 mm) | 15" (381 mm) | 15" (381 mm) |
| Impedance | 4Ω | 4Ω | 8Ω | 4Ω | 8Ω |
| Rated Noise Power1 | 500 W RMS3 | 1000 W RMS | 1000 W RMS | 1000 W RMS | 1000 W RMS |
| Sensitivity2 | 100 dB | 99.5 dB | 99.5 dB | 99.5 dB | 99.5 dB |
| Dimensions (HWD) inches | 38.3 x 30 x 14.5 | 35.75 x 30 x 20.25 | 35.75 x 30 x 20.25 | 40 x 31.5 x 19 | 40 x 31.5 x 19 |
| Dimensions (HWD) mm | 972 x 762 x 368 | 908.1 x 762 x 514.4 | 908.1 x 762 x 514.4 | 1016 x 800.1 x 482.6 | 1016 x 800.1 x 482.6 |
1 2 hours of 6 dB crest factor pink noise, AES method.
2 Based on nominal impedance, measured in half space 1 W @ 1 m.
3 AES2-1984, 2 hrs, Power = Vrms2/Znom
LF components connect with barrier strip screw terminals that accept up to #10 AWG stranded wire except for LF-4215-8F, which uses Neutrik Speakon™ NL4.
3 and 4 Driver Models
| Model | LF-4315 | LF-4215 x 2 |
| System Models | 3-way: SC-433C | 3-way: SC-443C |
| Drivers | 3 | 4 |
| Driver Information | 15" (381 mm) | 1 15" (381 mm) |
| Impedance | 5.5Ω | 4Ω |
| Rated Noise Power1 | 1500 W RMS | 2000 W RMS |
| Sensitivity2 | 99.5 dB | 102.5 dB |
| Dimensions (HWD) inches | 53 x 30 x 20.25 | 72 x 30 x 20.25 |
| Dimensions (HWD) mm | 1346 x 762 x 514.4 | 1820 x 762 x 514.4 |
1 2 hours of 6 dB crest factor pink noise, AES method.
2 Based on nominal impedance, measured in half space 1 W @ 1 m.
LF components connect with barrier strip screw terminals that accept up to #10 AWG stranded wire except for LF-4215-8F, which uses Neutrik Speakon™ NL4.