Seas Lotus Reference RM120 - L0021-04S

Description

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

• Large magnet system, holds the critical components in perfect alignment
• The hand-coated paper cone and the mechanically adapted natural rubber surround ensure an unusually soft mid-range.
• Heavy copper rings above and below the T-shaped pole core reduce non-linear and modulation distortions and increase the overload reserve.
• The large magnet system offers good sensitivity and a good transient response.
• The chrome-plated brass phase plug reduces compression due to temperature fluctuations in the voice coil, increases the long-term load capacity 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 resonance to a minimum.
• Gold-plated connections on a fiberglass-reinforced plate reduce contact resistance and improve reliability. 

Technical data

• Nominal impedance 4 Ohm
  
• Dimension category 4.5 inch
• 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 inch
• Winding depth 9.4 mm
• Gap height 6 mm
• Outer diameter 120.4 mm
• Diameter of the baffle cut-out 100 mm
• Depth 71.5 mm
• Thickness of the front 5 mm
• Depth after the front 66.5 mm
• Outer diameter (mm) 99 mm
• Cone material paper