Tesi 5

Tesi 5 by Indiana Line is a 2.5-way floorstanding column with a robustly reinforced bass reflex enclosure and a front-facing port. Inspired by the Tesi 561 model, the construction incorporates significant improvements compared to its predecessor. The components used in Tesi 5 ensure a high dynamic range of reproduced sounds and help reduce the impact of undesirable distortion and resonances on the audio quality.


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Indiana Line Tesi 5

The Tesi series, including the Tesi 5 model, stands out for its excellent balance of quality and price. It utilizes many proven components, known from models like Diva 3 and Diva 5 by Indiana Line. It features a simple yet versatile design. The new Tesi series columns offer an attractive, modern sound that is balanced, clean, and dynamic. The speakers are available in three colours: black oak, white, and mocha, catering to diverse user preferences and allowing the speakers to complement the room’s decor.

Stylish and sturdy enclosure

The Tesi 5 model has an MDF enclosure reinforced internally with sturdy braces, consistent with all floorstanding constructions from Indiana Line. Compared to its predecessor, the Tesi 561 model, the dimensions of the enclosure have changed slightly – the new Tesi 5 column is 1 cm taller. The front-facing bass reflex port allows the speaker to be placed close to the wall without concerns about excessive emphasis on low tones. Speaker baskets feature trim rings concealing their baskets resulting in an aesthetically pleasing appearance. Also noteworthy are the magnetic grille and slightly rounded upper edges of the enclosure, emphasizing the universal character of the Tesi 5 speaker.

The new front panel of the tweeter

The Indiana Line Tesi 5 features a 26-millimeter high-frequency dome with the Indiana Line’s special feature: a Radial Venting Chamber. The tweeter’s magnetic system incorporates a powerful neodymium magnet, and the front of the high-frequency transducer has been redesigned compared to previous models in the Tesi series. It now has a rectangular shape inspired by the latest speakers from the Diva series, although it is implemented using a simpler mounting technique. With this new design, enhancing the aesthetic integration with other electroacoustic transducers and significantly improving the speaker’s overall appearance.

New electroacoustic transducers

In addition to the tweeter, the Tesi 5 model employs two other transducers – a mid-woofer and a low-frequency driver with substantial linear excursion. Both have a diameter of 16 cm, the same as their counterparts in the older generation of the Tesi series. What has changed is the use of distinctive, smooth membranes made of polypropylene with a touch of mica in both transducers. This ensures the necessary rigidity for exceptionally precise reproduction of even the smallest details in the played sounds. Furthermore, the phase corrector used in the Tesi 561 model has been replaced in the Tesi 5 speaker with a dust cap. All these improvements result in a clean, yet open sound in the midrange with a deep and pronounced bass.

Optimized components

The Indiana Line Tesi 5 speaker incorporates a total of three well-designed electroacoustic transducers. Those responsible for the low and mid-range tones have been optimized using modern design techniques, including special rings to linearize impedance. The implementation of larger magnets has significantly reduced distortion, improved linearity, and enhanced the reproduction of low frequencies. These solutions ensure a transparent, clear sound, even when playing at high volume.

Innovative Dual-Wave suspension

The Tesi 5 features an innovative suspension system for its mid-woofer speakers, known as Dual-Wave. This solution was first introduced in the new models of the Diva series. Visually, Dual-Wave draws inspiration from the designs of stage speakers equipped with accordion-like springs. In the case of Indiana Line speakers, the suspension has been precisely engineered to extend the linear operating range and reduce intermodulation distortion, especially at low frequencies. This, in turn, contributes to improved clarity in the midrange. The positive impact of this solution is particularly noticeable in the reproduction of percussion, acoustic, and string instruments.

Enhanced crossover design

The new, highly optimized crossover of the floorstanding Indiana Line Tesi 5 has been developed using state-of-the-art design methods and specialized measurement systems. It maintains corresponding topology and component quality as those installed in the new Diva series models (Diva 3 and Diva 5). Thanks to the crossover, which ensures a smooth impedance characteristic, high efficiency, low distortions, and proper sound distribution, the Tesi 5 speaker is compatible with any amplifier.

The most important features of the Tesi 5 model:

  • 2.5-way acoustical design
  • Magnetically attached grille
  • Highly optimized crossover design
  • Crossover frequencies: 600 Hz and 3 kHz
  • MDF enclosure with internal reinforcement matrix
  • 160 mm woofer driver
  • 160 mm woofer-midrange driver
  • Enlarged and improved motor magnetic circuits, with impedance linearising rings
  • Dual-Wave – proprietary upper suspension design for woofer and midwoofer membrane
  • 26 mm tweeter with Radial Venting Chamber technology
  • Bass reflex enclosure with a port on the front of the speaker
  • Frequency response: 35 Hz to 22 kHz
  • Available colours: white, black oak or mocha
  • Recommended amplifier power: 30 – 150 W
  • Sensitivity: 92 dB (2.8 V/1 m)
  • Dimensions (H x W x D): 900 x 180 x 300 mm
  • Weight: 13.5 kg

Technical data

Speaker alignment / type

2,5-way / floorstanding

Box aligment / port placement

bass-reflex / front

Driver diameter

midwoofer: 1 x 160 mm, mica-polypropylene cone, tweeter: 26 mm, textile dome, woofer: 1 x 160 mm, mica-polypropylene cone

Frequency response

35 – 22000 Hz

Sensitivity (2,8 V/1 m)

92 dB


600 / 3000 Hz

Bi-wiring / bi-amping


Amplifier loading impedance

4 – 8 ohm

Suggested amplifier power

30 – 150 W

Dimensions (H x W x D)

900 × 180 × 300


black, white, mocha


13,5 kg

100% polyester damping

All Indiana Line cabinets are filled with polyester – a synthetic non-woven fabric of high purity, known for its excellent damping of the internal resonances of the speaker cabinets. What's more, polyester is also extremely resistant to stretching, drying and moisture.

100% polyester damping

Air coils and film capacitors

In order to emphasize the exceptionally clear and natural sound of our loudspeakers, we decided to get rid of the troublesome components from the crossover where it was necessary – in the tweeter filter. In all loudspeaker models in which this filter is used, we use only air coils and foil capacitors. These elements do not introduce harmful distortions to the filtered signal, as is the case with ferrite core coils and electrolytic capacitors.

Air coils and film capacitors


The short-circuit ring is made of pure, perfectly electrically conductive aluminum (1010). It has been placed inside the magnetic system of the mid-woofer. By linearizing the impedance of the loudspeaker, it positively influences the sound of the low and medium frequencies of the acoustic band, significantly reducing non-linear distortions. The ring also absorbs the heat emitted from the speaker coil, increasing its thermal load capacity.


Computer-optimized crossover design

The use of numerical calculations allowed for obtaining a balanced frequency response and low level of distortion, as well as reducing power losses. The obtained sound results were verified by many hours of listening tests. The tweeter filter circuit uses only air coils and foil capacitors. This allowed to avoid distortions that often appear in the case of electrolytic capacitors or coils with a ferrite core. Core coils, when present in a crossover, have a laminated high-silicon iron core, which minimizes distortion from the iron cores.

Computer-optimized crossover design

Dual-Wave suspension

The Dual-Wave upper spring is an original, precisely designed membrane suspension that expands the range of linear operation of the loudspeaker. It reduces distortion, especially in the low bass registers, and improves the articulation of the midrange of the acoustic band. This translates into improved sound of instruments, especially percussion, string and acoustic ones. Thanks to the Dual-Wave solution, unevenness of the frequency response, which results from the resonance of the membrane edge, is also reduced, without the need to varnish it. Dual-Wave suspension drivers also have an eye-pleasing appearance that refers to professional designs used, among others, on stages and equipped with the so-called accordion springs.

Dual-Wave suspension

MDF housing with transverse reinforcements

Indiana Line loudspeakers cabinets are made of MDF panels. They are made using the latest production techniques, which ensures high precision of workmanship, great repeatability and excellent performance parameters for many years. MDF is a moisture-resistant material, it is massive and it suppresses all resonances very well. To completely remove unwanted vibrations, we used transverse reinforcements of the cabinet. They take the form of horizontal rings that are located at key points along the entire height of the loudspeaker cabinet.

MDF housing with transverse reinforcements

Mica-poly cone

Universal and extremely popular polypropylene is a valued material, often used for speaker membranes. However, in order to ensure the most faithful transmission of micro-details, we decided to further increase the stiffness of the cone. We achieved this by doping polypropylene with a mineral called mica. This shiny, hard material significantly improves the parameters of the membrane, guaranteeing the transducer a long and reliable operation, and at the same time giving it an attractive appearance.

Mica-poly cone


A radial damping chamber that prevents harmful reflections under the tweeter dome while allowing it to achieve a low resonance frequency. The small, but at the same time strong, neodymium magnet of the tweeter is surrounded by a space in which – due to its shape – standing waves cannot be generated, which is the case with classic radial chambers located in the axis of the dome.


Indiana Line New Tesi – owner's manual