Seas Lotus Reference RM120 - L0021-04S

Beschreibung

Use the Lotus Reference RM120 - L0021-04S from Seas, a special type of cone driver, tuned for use in cars. This  5" (13cm) woofer/midrange driver stands out thanks to its large magnet system, which keeps important components perfectly aligned. Thanks to the hand-coated paper membrane and the mechanically adjusted natural rubber surround, a first-class, soft midrange range is achieved. Other technologies such as heavy copper rings and a chrome-plated brass phase plug reduce distortion and offer high resilience. In addition, the injection-molded zinc basket guarantees outstanding stability and effective minimization of noise caused by sound reflections and air currents.

• Large magnet system keeps critical components in perfect alignment
• The hand-coated paper membrane and the mechanically adjusted natural rubber surround ensure an unusually soft midrange.
• Heavy copper rings above and below the T-shaped pole core reduce nonlinear and modulation distortion and increase the overload reserve.
• The large magnet system offers good sensitivity and transient response.
• The chrome-plated brass phase plug reduces compression due to temperature fluctuations in the voice coil, increases long-term power handling and eliminates resonances in the cavity within the voice coil former.
• The extremely rigid and stable injection-molded zinc basket keeps the critical components in perfect alignment. Large windows in the basket both above and below the spider reduce sound reflections, airflow noise and cavity resonances to a minimum.
• Gold-plated connectors on a glass fiber reinforced plate reduce contact resistance and improve reliability. 

Technical data

• nominal impedance 4 ohms
  
• dimension category 4.5 inches
• Frequency range type full range
• Manufacturer sensitivity 90.5 dB
• Calculated sensitivity 87.57 dB
• Nominal load capacity 110 W
• Maximum load capacity 400 W
• bandwidth 300÷5000 Hz
• Sd 50 cm²
• Mms 4.55 gr
• Cms 1100 µm/N
• Rms 0.73 kg/s
• Le 0.25 mH
• Re 3 Ohm
• BL 4 Tm
• Fs 72 Hz
  
• Qes 0.4
• Qms 2.95
• Qts 0.35
• Vas 4 L
• flux density 1.1 T
• Xmax ±1.7 mm
• Calculated Xmax ±3.7 mm
• EBP 180 Hz
• Fs / Qts 206 Hz
• Vas * Qts² 0.49 L
• Calculated efficiency 0.36%
• Weight ~1.3 kg
• voice coil diameter 1.02 inches
• winding depth 9.4 mm
• gap height 6 mm
• outer diameter 120.4 mm
• Diameter of the baffle cutout 100 mm
• depth 71.5 mm
• thickness of the front 5 mm
• Depth to the front 66.5 mm
• Outer diameter (mm) 99 mm
• cone material paper