Strassacker: precise Subwoofer with Puls Compensation by Bernd Timmermanns

Home Car&HiFi the Drivers the passive Mini the Subwoofer High-End: BE 4D Hexagon

Hexagon, the Neutral High-End Bass taken from Hobby HiFi 4/2001

The 55 x 60 x 52 cm (HxWxD) sized, hexagonal subwoofer shown here, comes with 2 drivers and 2 passive radiators. This subwoofer is a development by Bernd Timmermanns and featured in Hobby HiFi 4/2001.

The front panel shows the IR receiver, the amplifier is on the opposite side. On the left side and the side opposite are the two drivers, while the two passive radiators are on the right side and on the side opposite.

Due to the fact that the two drivers are on opposite sides, the unwanted cabinet vibration could be reduced to below 1/10. Radiation and sound output remains the same as with any subwoofer of this size with two drivers.

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Building instruction - Bass Hexagon (2 x 40 litre cabinet volume)

The building instruction is to found in HiFi 4/2001 or comes with out kit. You will find out that it isn't that difficult to build this complex looking subwoofer. The horizontal top and bottom panels as well as the vertical, internal bracing panels are the foundation.
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contents of the kit

The kit contains:

2 x Bass Exciter BX10

2 x Bass Exciter passive radiator BXP10

1 x subwoofer amplifier
Det 110 MK II with remote control

32 Allen screws 5x30 mm, black

driver sealing tape

2 metre cable 2 x 2,5 mm2

building instruction

the frequency response

Picture left:
Frequency response at 50, 100 and
150 Hz, crossover frequency

It's obvious that the BassExciter isn't an expert in extreme low bass. Sound quality, precision and clean bass without any slack and boominess are the Hexagon's forte.

the sound

The use of passive radiators, pulse correction and the strong magnet of this conservatively designed BassExciters, the bass produced is deep and precise as well as neutral and unobtrusive.

Order No. BEHexagon, price per unit (without cabinet): - not available

The driver: BassExciter® by Ralph Mantel

The BassExciter produces an astonishingly deep and clean bass, even in a small 17 litre cabinet. This goal was achieved by developing the BX 10 and the passive radiator BXP 10 (available since 8/2000).

BX 10

25 cm top class bass driver with coated paper cone, twin magnet, rubber surround, ventilated magnet system and sheet steel basket.

output (continuous/programme): 100/200 Watt

impedance: 4 Ohm

resonance frequency fs: 30 Hz

DC resistance Rdc: 3.5 Ohm

mechanical Q factor: 6.76

electrical Q factor Qes: 0.36

total Q factor Qts: 0.34

equivalent volume of compliance Vas: 50.07 L

voice coil inductance at 1 kHz: 3.12 mH

effective mechanical mass incl. air load Mms: 91,3 g

mechanical compliance Cms: 0,30 mm/N

effective piston radiating area Sd: 365 cm²

electro-magnetice force factor BI: 13,11 N/A

sensitivity (2,83V /1m/1kHz): 87 dB

voice coil height: 23.5 mm

voice coil layers: 4

outside diameter: 258 mm

cut-out required: 229 mm

mounting depth: 133 mm

countersunk depth: 11 mm

cone diameter: 169 mm

mounting holes: 8x5 mm on 250 mm diameter circle

Price EUR 119,00

The amplifier module

As amplifier we chose the Detonation Det 110 MK II; this amplifier is solidly built, powerful and my be connected to any hi-fi or home cinema system known to us.
Subwooferverstärker wie in Klang+Ton 6/1999 beschrieben

Subwooferverstärker wie in Klang+Ton 6/1999 beschrieben

Outside view of the module. Above (4):
- volume,
- crossover frequency,
- phase from 0 to 180 degrees

Below (1) the lower terminals for connection to your home cinema unit or pre-amp.

To the right from there (5)
- bass (at about 28 Hz) may be increased by 3 or 6 dB,
- the internal crossover may be bridged (standard is "off")
- the amplifier may be switched off or on or you leave it up to the amplifier (auto).

Below are 4 input terminals(2) for connection to the loudspeaker output terminals of your amp; to the right 4 output terminals (3) to release your loudspeakers from bass (this only works if the terminals (2) are connected to your main amp).

and finally (6) - the mains cable.

Subwooferverstärker wie in Klang+Ton 6/1999 beschrieben Inside view of the module: below left is the toroidal transformer, above from there the red/black cable to connect the driver. Right the controller board with individual controls. Above the transformer is the main amp board and right at the top the pre-amp.

The module comes standard with a remote control (not pictured).

Price Det 110 MK II: - not available

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