LS3/5B is a two way compact speaker. It is modeled on the LS3/5A near-field monitor of the British broadcasting company BBC. It enjoyed great popularity for decades.
LS3/5B is a closed-cabinet loudspeaker with drivers of Wavecor .
The kit is delivered with the following drivers:
- a TW022WA05 tweeter
- a WF152CU14 midrange / bass driver
The loudspeaker has been developed by Bernd Timmermanns.
The crossover consists of:
- a 3rd order high-pass filter (18 dB per octave slope) for the tweeter.
- a band pass consisting of a 3rd order high pass filter (18 dB per octave slope) and a 3rd order low-pass filter (18 dB per octave slope) for the mids-woofer.
The frequency response of this speaker is nearly linear.
The decay spectrum as shown in the waterfall diagram is exemplary, free of any disturbing resonance.
At medium volume, i.e. 90 dB at 1 m, the nonlinear distortions are below 0,3% above 500 Hz.
the crossover components (right),
to be mounted on a small wooden board.
Kit without cabinet, price per speaker EUR 289,00 excl. VAT: € 242.86 / $ 286.57
The high-end kit is delivered with baked varnish air core coils on important parts of the crossover for minimizing microphonic effects. - The current flow through the coil creates a magnetic field which sets the reel of wire in motion. This motion induces a voltage in the coil which adds itself to the signal. The stiffer the reel of wire is, the less the signal will be altered. The capacitors for the TW022WA05 are of type polypropylen (MKP) Mundorf MCAP EVO Oil.
Kit with high-end-crossover without cabinet, price per speaker EUR 359,00 excl. VAT: € 301.68 / $ 355.98
Since core coils always lead to non-linear distortion due to re-magnetization losses (the Hepta Coil LH45), Dr. Peter Strassacker suggests this kit as an alternative to the high-end kit. It does not contain a ferrite core but Mundorf copper foil coils in series to the mid-woofer.
Kit with high-end-crossover without cabinet, price per speaker EUR 377,00 excl. VAT: € 316.81 / $ 373.83
If you want to use a valve amplifier with this speaker an impedance correction should be employed. In this case the component quality is less important; therefore, we offer only one kit (upon request higher quality components are available).
Price per impedance correction for one speaker, to be mounted on a small wooden board. EUR 10,40 excl. VAT: € 8.74 / $ 10.31
If you prefer to mount the crossover components on a 140 x 102 mm universal PCB instead on wood:
Universal PCB RA140, order no.. str-RA140, price per unit: EUR 4,20 excl. VAT: € 3.53 / $ 4.16
We recommend one board per kit (two boards for a speaker pair)
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