Loa Hifi JBL Subwoofer LS120P - Âm thanh cao cấp

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Loa Hifi JBL Subwoofer LS120P

The LS120P is a powerful, front-firing powered subwoofer with a 300mm (12") low-frequency transducer, a 400-watt-RMS high-output, high-efficiency amplifier, and a high-quality cabinet with beautifully polished high-gloss-ebony wood panels.
JBL’s LS120P subwoofer ($1099 USD) is a relatively large box that measures 19.9"H x 14.6"W x 17.1"D. Its enclosure is finished similarly to the other LS-series speakers, in what appears to be rosewood (JBL calls it ebony) and a fabulous lacquer topcoat. The top of the box is finished in a heavy, leather-like plastic that continues down the front. The front grille is attached with posts and is easily removed; during the review period, I left the grille on -- it didn’t seem to affect the sound quality at all. The woofer itself is a 12" cone made of JBL’s exclusive PolyPlas material, a polymer-coated paper that JBL says combines low weight (for quick transient response) and high stiffness (for low distortion). The amplifier is rated at 400W RMS (700W peak), which should be enough for nearly any situation short of reproducing the sound of a Space Shuttle blastoff. The LS120P’s frequency response is claimed as 25-150Hz, with a continuously adjustable crossover from 50 to 150Hz; the crossover’s slope is a fourth-order, 24dB/octave type. No magnet weight is specified, but it’s probably pretty heavy; the sub weighs a solid 57 pounds. Included along with a good instruction manual are spikes and cups to prevent floor damage, and a 15’ mono patch cord. While JBL suggests placement for a two-channel system, the fact that the sub’s only input is line-level suggests that it was primarily designed for use in home theaters.
All controls are on the rear panel. From top to bottom are the phase switch (0° and 180°), an LFE/Normal selector (more on that below), rotary controls for subwoofer level and crossover frequency, an LED power indicator (green for On, red for Standby), and left and right RCA inputs. Finally, there are the mains switch and a two-pronged IEC power-cord inlet.
The LFE switch was a new one on me. As the owner’s manual explains, it’s there to make the sub integrate with the latest A/V receivers, which have a low-frequency-effects sub output. Engaging the LS120P’s LFE switch disengages the sub’s crossover-frequency control; the receiver itself now controls that. If your amplifier has no LFE output but does have a subwoofer output, flip the JBL’s switch to Normal, and use the supplied patch cord to connect the LS120P to your amp’s standard sub output.