SBTL, Floorstanding   as in Hobby HiFi 5/2010

Technical data
- impedance: 4 Ohm
- sensivity (2,83V/1m): 85 dB
- size (HxWxD): 860 x 160 x 260 mm
- frequency range (-8dB): 37 - 35000 Hz
- crossover frequency(s): 1800 Hz
- speaker type: transmission line

The SBTL is a small transmission line speaker with drivers by SB Acoustics. The design is similar to the Fuzzy transmission line, known to the readers of the magazine Hobby HiFi as Fuzzy TML, introduced in issue 1/2009.

The speaker is equipped with ring radiator and a 12 cm woofer. One should not expect miracles from the bass of 12 cm woofer; for higher volumes a different solution should be used like Fuzzy TML as in Hobby HiFi 1/2009.

The speaker is controlled by a 12 dB crossover.

An excerpt from the Hobby HiFi review

"The listening test proved that upgrading from a simple MKP to Audyn Plus showed better results than upgrading from an Audyn Plus to Silver capacitor. Anyway: Those who have the necessary funds available and wish to get the best out of the SBTL shouldn't hesitate to invest into a high frequency capacitor of this price bracket. Even with the inexpensive crossover version the sound of the SBTL is astonishingly airy and natural. The loudspeaker produces an almost realistic sound. The bass is terrific: extremely transparent, tight and without bulge. The bass slip in the frequency response didn't show any consequences in practice. The bass is cleanly structured and surprises with a taste of splendid low bass which we never expected from such a slim loudspeaker. Needless to say, one should not expect miracles regarding maximum dynamics. Even though the woofer shows quite a cone travel the radiating area is a mere 54 square centimeters. In a room of 25 square meters you can really enjoy the music without paying too much attention to the volume. Yet, it is still possible to overdo it. For those of you who like to listen at high volumes the SBTL is not the right speaker. The clarity of the mids are delighting, producing vocals that are right in the center of your living room. The realistic tonality and the spatial definition are complementing one another perfectly. It's absolutely puzzling how the tops are resolving even the finest details without a hint of exaggeration. Understatement would be term that comes to mind: nothing is forced, it's all about attention to detail. In this regard they are not shy at all. Three-dimensionality is somewhat constrained and, therefore, not particularly wide, but rather accurate with a well defined width and depth. This speaker is no show-off , but rather a thoroughly honest speaker - nothing is exaggerated , everything is real and authentic. By using a high-end crossover the SBTL pays even more attention to detail. Listening to Vivaldi's The Winter" it is easier to distinguish between the individual strings. The excerpt from the radio play by SWF radio station, also to be found on this CD, shows a greatly increased depth. Initially, the differences between the two crossovers are rather subtle. But the longer you switch between them so much more pronounced are the differences until you cannot do without the high-end version anymore."

Our kit consists of

  • SB Acoustics SB12NRXF25-4
  • SB Acoustics SB29RDCN-000-4
  • Damping fleece for MT Bondum 800 (30 x 50 x 2 cm)
  • Damping Sonofil for 20 litres, white
  • Binding Post PK31 (per pair, red and black)
  • 2.5 m Speaker cable 2x2.5 mm2, transparent
  • Pan screws 4x20 black, 8 pieces
  • Plan for DIY kit

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

  • electrolytic capacitor, unetched, 10 μF / 70 Vdc
  • electrolytic capacitor, unetched, 15uF / 70 Vdc
  • MKP capacitor 6.8 μF / 400V
  • air core coil 0,7 mm, 0.47 mH/0.57 Ohm
  • air core coil 1,4 mm, 1.2 mH/0.33 Ohm
  • 2x MOX4 resistor 4.7 Ohm/4 Watt (yellow-purple-gold)
  • MOX10 resistor 4.7 Ohm/10Watt (yellow-purple-gold)

Kit without cabinet, price per speaker - not available


Kit with high-end crossover

In our high-end version Tritec/Hepta inductors are used. The capacitor in series to the tweeter is a Clarity CAP ESA capacitor. The crossover parts are:

  • MKP capacitor Q4 10uF / 400V
  • MKP capacitor Q4 15uF / 400V
  • Clarity CAP ESA 6.8uF / 800V
  • Hepta coil 0.47 mH/7x0.6 mm, 0.17 Ohm
  • Hepta coil 1.2 mH/7x0.6 mm, 0.33 Ohm
  • 2x MOX4 resistor 4.7 Ohm/4 Watt (yellow-purple-gold)
  • MOX10 resistor 4.7 Ohm/10Watt (yellow-purple-gold)

Kit with high-end crossover without cabinet, price per speaker - not available

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).

  • electrolytic capacitor, unetched, 33uF / 70 Vdc
  • Mundorf air core coil L71, 0.39 mH/0.51 Ohm
  • MOX10 resistor 5.6 Ohm/10Watt (green-blue-gold)

Price per impedance correction for one speaker, to be mounted on a small wooden board.   EUR 17,10 excl. VAT: € 14.37 / $ 15.38


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 / $ 4.23
We recommend one board per kit (two boards per speaker pair)

Home   Hobby HiFi Overview