Take your music experience to a new level with the 4 Inch (100mm) Relax 100 RFS speaker set from BLAM. This set brings state of the art technology and high quality sound at a low cost.

The Relax 100 RFS is the latest update to the popular 100RS standalone series and offers an extended reproduction range for low and high frequencies. Thanks to its high sensitivity and two-ohm voice coils, this set is ideal as an upgrade for your car. Installation is easier with the new, robust composite chassis and the compact distribution filters for the tweeters.

Product Features

• 2 x 100 mm (4″) woofers
• 2 x 20 mm soft dome tweeters
• 2 x 6 dB/octave high-pass crossovers.
• Max power 100 W
• Nominal power 50 W
• Frequency response 80 Hz – 30 kHz
• Sensitivity 90.3 dB
• Impedance 2 Ω

Technical Features

• Original BLAM composite basket reinforced with fiberglass
• High quality treated cellulose pulp membrane
• Butyl rubber surround
• Long life “Conex” damper
• 25 mm (1”) voice coil on Kapton former
• 70 mm x 15 mm ferrite magnet
• Thick magnetic circuit (4 mm)
• High quality 20 mm (3/4”) soft dome tweeter
• 6 dB/octave high pass crossover
• Tweeter level adjustable to 0 dB or attenuated to -3 dB

Technical Specifications

• Component Speaker
• Max power 100 W
• Nominal power 50 W
• Impedance 2 Ω
• Freq. Response 80 Hz - 15 kHz
• Sensitivity (2,83V/1m) 90.3 dB
• Magnet Ferrite
• Magnet size Ø x h 70 x 15 mm 2.756‘’x 0.591‘’
• Total driver displacement 0.11 l 0.004 cf
• Weight of one component 0.578 kg 1.274 lb
• Voice coil Ø 25 mm 0.984“
• Voice coil height 8.4 mm 0.331“
• Cone Cellulose pulp

Technical Parameters

• effective Ø (d) 84 mm
• Sd 55.42 cm²
• Xmax 2 mm
• Re 2.6 Ω
• Fs 109.87 Hz
• Le 97.33 µH @ 1 kHz
• L2 157.34 µH @10 kHz
• Vas 1.76 L
• Mms 5.16 g
• Cms 0.000407 m/N
• BL 3.49 Tm
• Qts 0.66
• Qes 0.77
• Qms 4.72

Technical Specifications Tweeter

• Component Tweeter
• Max power 100 W
• Nominal power 10 W
• Impedance 3 Ω
• Freq. Response 2,5 KHz - 25 KHz
• Sensitivity (2,83V/1m) 90 dB
• Magnet Neodymium
• Magnet size Ø xh 18 x 3 mm 0,709"x 0,118"
• Total driver displacement 
• Weight of one component 0,045 kg 0,099 lb
• Voice coil Ø 20 mm 0,787"
• Voice coil height 2 mm 0,118"
• Cone Soft

Technical Parameters Tweeter

• effective Ø (d) 22 mm
• Sd 3,80 cm2
• Xmax
• Re 3 Ω
• Fs 1651 Hz
• Le
• L2
• Vas
• Mms
• Cms
• BL
• Qts
• Qes
• Qms

Sensitivity (dB/W/m) 86,7 dB

Supplied Accessories

• Mounting screws
• Mounting accessories for tweeters
• User manual

Dimensions