Scan Speak BeTi 4x4 floorstanding loudspeakers from K+T magazine 6/2018

Kit without housing price per speaker

BeTi 4x4 is a 2.5-way floor-standing loudspeaker. BeTi 4x4 is a bass reflex loudspeaker with a beryllium membrane tweeter from Scan Speak and a titanium membrane woofer from Visaton. The loudspeaker contains the following loudspeaker chassis: - a Scan Speak D3004/6040-10 tweeter - two Visaton TI 100 mid-woofers, 8 Ohm - two Visaton TI 100 woofers, 8 Ohm The loudspeaker was developed by Bernd Timmermanns. The crossover consists of: - a 3rd order high pass (18 dB / octave) for the tweeter. - a 3rd order low pass (18 dB / octave) for the mid-woofer. - a 2nd order low pass (12 dB / octave) for the woofer. The frequency response of the loudspeaker is perfectly linear. The decay spectrum is practically error-free. The nonlinear distortions at medium volumes (90 dB, 1m) are below 0.35% above 300 Hz.

The high-end kit is equipped with baked varnish coils in the important places to reduce the microphonic effect (the current through the coil generates a magnetic field, which in turn sets the winding in motion. This movement induces voltages in the coil, which are added to the useful signal. The tighter the winding of the coil, the less the useful signal is distorted.) The capacitors for the tweeter - where quality is particularly important - are high-quality Mundorf M-Cap Evo silver/gold/oil capacitors.

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Technical data:

• Impedance: 4 Ohm
• Sound pressure level (2.83V/1m): 88.5 dB
• Dimensions (HxWxD): 965 x 230 x 300 mm
• Frequency range (-8dB): 48 - 28000 Hz
• Crossover frequency(s): 2000 Hz
• Principle: bass reflex box

Highlights

• ScanSpeak Illuminator D3004/6040-10 dome, beryllium
• 4x Visaton TI 100, 8 Ohm
• 4x bass reflex tube HP50, 50x145 mm, black
• 0.5x PE foam sealing strip, 5x2 mm, roll 7.5 m
• Insulating material Sonofil 100 x 35 cm for 20 liters
• 0.5x Audaphon Damping 10, 970 x 470 mm, self-adhesive
• Pole terminals PK31, one pair, gold-plated, red+black
• 4m speaker cable 2x2.5 mm2, transparent
• 0.5x chipboard screw 5x50 countersunk head galvanized, 8 pieces
• 2.5x pan screws 3.5x17 black, Phillips, 8 pieces
• Construction plan for the kit the crossover components (right), on a Build wooden boards.
• Mundorf MCAP EVO Silver Gold Oil 10 μF / 450 V
• Mundorf MCAP EVO Silver Gold Oil 22 μF / 450 V
• Audaphon MKP CAP Superior 12 μF / 400 Vdc
• Audaphon MKP CAP Superior 15 μF / 400 Vdc
• Mundorf HeptaLitze coil II45, 0.22 mH/0.18 Ohm
• Mundorf baked varnish air coil BL180, 0.82 mH/0.17 Ohm
• Mundorf baked varnish air coil BL180, 1.8 mH/0.31 Ohm
• Mundorf BS180 core coil 4.7mH/0.15Ohm
• Metal oxide resistor MOX10 2.2 Ohm (red-red-gold)
• Metal oxide resistor MOX10 4.7 Ohm (yellow-violet-gold)
• Metal oxide resistor MOX5 0.47 Ohm 5% (yellow-violet-silver)