Surprise is a compact loudspeaker with a full range driver, that includes a second speaker on the back for room acoustics.
Surprise is a bass-reflex cabinet loudspeaker with drivers of Omnes Audio and Omnes Audio.
The kit is delivered with the following drivers:
- a Omnes Audio BB4 black full range driver
- a Omnes Audio BB3.AL full range driver (on the back)
The loudspeaker has been developed by Bernd Timmermanns.
The crossover consists of:
- a blocking circuit in series with the full range driver.
- a 2nd order high-pass filter (12 dB per octave slope) for the full range driver on the back.
The frequency response of this speaker is mostly linear.
The decay spectrum (waterfall spectrum) shows a decelerated swing-out behaviour in the mid-range.
At medium volume, i.e. 90 dB at 1 m, the nonlinear distortions are below 3% above 100 Hz.
the crossover components (right),
to be mounted on a small wooden board.
Kit without cabinet, price per speaker - not available
The high-end kit is delivered with baked varnish air core coils 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 Omnes Audio BB4 black are of type polypropylen (MKP) Mundorf MCAP EVO Oil.
Kit with high-end-crossover without cabinet, price per speaker - not available
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 14,20 excl. VAT: € 11.93 / $ 12.65
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 / $ 3.74
We recommend one board per kit (two boards for a speaker pair)
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