Orchestra Monitor 4   Shelf speaker as in K+T 4/2018

Technical data
  • impedance: 8 Ohm
  • sensivity (2,83V/1m): 83 dB
  • size (HxWxD): 266 x 166 x 210 mm
  • frequency range (-8dB): 45 - 26000 Hz
  • crossover frequency(s): 5000 Hz
  • speaker type: bass reflex

Orchestra Monitor 4 is a two way compact speaker.

Orchestra Monitor 4 is a bass-reflex cabinet loudspeaker with drivers of Eton .

There is also a bass extension Orchestra TT 8.

The kit is delivered with the following drivers:
- a Eton 29 HD 2 tweeter
- a Eton 4-612/C8/25RP midrange / bass driver

The loudspeaker has been developed by Thomas Schmidt.

The crossover consists of:
- a 3rd order high-pass filter (18 dB per octave slope) for the tweeter.
- a 3rd order low-pass filter (18 dB per octave slope) for the woofer.

The frequency response of this speaker is nearly linear.

The decay spectrum is nearly perfect.

At low volume, i.e. 85 dB at 1 m, the nonlinear distortions are below 0,6% above 300 Hz and doesn't exceed 1,5% at 95 dB at 1 m between 300 and 15000 Hz.

Our kit consists of

  • Eton 28mm ceramics dome tweeter 29HD2
  • Eton 4 inch paper cone mid-woofer 4-612/C8/25RP
  • Bass reflex tube HP35, 35x125 mm, black
  • 0,5x PE sealing tape, 5x2 mm, 7.5 m
  • 0,5x Damping Sonofil 100 x 35 cm for 20 litres
  • Binding Post PK31, gold plated (one pair, red and black)
  • 2m Speaker cable 2x1.5 mm2, transparent
  • 1,5x Pan screws 4x20 black, cross recess, 8 pieces
  • Plan for DIY kit

the crossover components (right),
to be mounted on a small wooden board.

  • Audaphon MKP CAP Superior 1.5 μF / 400 Vdc
  • Audaphon MKP CAP Superior 2.2 μF / 400 Vdc
  • Audaphon MKT CAP 5.6 μF / 160 Vdc
  • 1.0 mm air core coil, 0.10 mH/0.14 Ohm
  • 1.0 mm air core coil, 1.5 mH/0.63 Ohm
  • 0.7 mm air core coil, 0.10 mH/0.27 Ohm
  • 0.7 mm air core coil, 0.15 mH/0.28 Ohm
  • Metal-oxide resistor, 10W 5.6 Ohm (green-blue-gold)

Kit without cabinet, price per speaker   EUR 325,00 excl. VAT: € 273.11 / $ 294.96

Kit with high-end crossover

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 tweeter are of type polypropylen (MKP) Clarity-Cap CSA 630 V.

Kit with high-end-crossover without cabinet, price per speaker   EUR 377,00 excl. VAT: € 316.81 / $ 342.15

Impedance correction

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 7,50 excl. VAT: € 6.30 / $ 6.81

universal PCB

If you prefer to mount the crossover components on a universal PCB instead on wood
PCB 150x115 mm, tin plated, price per unit:   EUR 4,70 excl. VAT: € 3.95 / $ 4.27
We recommend one board per kit (2 boards per speaker pair)


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