(123) 456-7890 email@domain.com

TopLine Bob L



The Top Line “Bob” L has the same footprint as the Top Line “Bob” XL, with only two thirds of the height. Each speaker has an integrated, DSP-controlled active subwoofer with 1500 watt amplifier power. The rest of the loudspeaker works passively, with optimal reproduction down to 60Hz.

Modular System Our Top Line Bob L horn speakers can be upgraded in many ways for an even better music experience. The Top Line Bob L can be converted to a Bob XL with the “Bob XL Upgrade”. If you want to achieve even more power with your Bob L, there is the possibility to link it with our Bob L subwoofer. If that’s not enough you can upgrade your Bob XL to a Bob XL+ which includes an additional subwoofer to the Bob XL.


SPL: 91dB 1W/1m

Impedance: 4 Ohm

Crossover Frequencies: 4000 Hz / 570 Hz/ 37 Hz ( Active)

Frequency range: 20 Hz – 21000 Hz (-3dB)


Material: Wood

Colors: The colors of the housing and horn can be chosen individually

Weight: 74 kg (per piece)

Dimensions: Height: 1250mm Height including Horn: 1750mm Width Front: 300mm Width Rear: 510mm Depth: 355mm Depth including Horn 565mm Diameter Horn 750mm,


Holger Barske- Hifi Test

“The Topline L plays  well-balanced, smooth and pleasant. The Enclosure-less Bass Section Sounds uniquely uncolored and Free. Great Class ! ”

Jason Victor Serinus – Stereophile

“The Topline Bob L delivered an arresting three-dimensional soundstage and marvelous range of colors.”

The Basic Idea behind the Bob L

We wanted to create a smoothly sounding horn loudspeaker with exceptional impulse response – that was the core idea behind the TopLine Bob L High-End Speaker. A horn provides the best adaptation of diaphragm movement to the air, which carries the sound. To obtain precise low-frequency information, we adopted this concept for the mid and high frequencies.

Many manufacturers utilize horn technology to enhance efficiency; however, that was not the intention for the high-end Bob L speaker. In our perspective, this often results in a somewhat thin and harsh sound. For the same reason, we avoided compression drivers in the TopLine horn speakers. Instead, achieving perfect harmony between the horns and drivers took center stage for us.

For the lower frequencies, we opted for an open baffle configuration, which perfectly and evenly loads the speakers on both sides – a concept known as the “Open-Baffle Principle.” Additionally, we chose speakers with substantial surface area for the bass range. A smaller cone area would require compensation through greater excursion, which is less linear.

A large diaphragm area implies significantly reduced diaphragm displacement, enabling the diaphragms to move exclusively within their linear range. The outcome: remarkably low distortions and a genuinely clean sound.

In the lower midrange, three 10″ Kevlar diaphragms carry out their task. With a total area of 200 square inches, they are treated with a special carbon composite. The bass is reproduced by six 12″ speakers treated with carbon composite, providing an area of about 600 square inches.

“Masterful Sound Artistry: The TopLine Bob L High-End Loudspeakers”

On each side of the TopLine Bob L High-End Loudspeakers, three bass speakers are mounted, enabling excellent impulse compensation and minimal resonances within the enclosure. Each Bob L speaker is powered by 1500 watts in the bass range and controlled through a Digital Sound Processor (DSP) to perfectly tailor bass reproduction to the room.

Conversely, the mid and high-range speakers operate passively. As a result, you can utilize your preferred electronics from 40 Hz upwards. In the crossover, we exclusively incorporated top-quality components. Our focus was not solely on an exceptional frequency response; we also prioritized maintaining a linear phase and achieving impeccable transient response.

We firmly believe that crafting devices with outstanding sound requires more than just impeccable technology, which is undoubtedly a crucial factor. However, it’s the combination of excellent craftsmanship, a passion for music, and extensive experience that empowers us to create masterpieces like the TopLine horn loudspeakers.

General characteristics of the SteinMusic Top Line Speaker series

  • Open baffle for the non-horn loaded speakers achieves a perfect impulse response, as the speakers are not caged in a box.
  • Big diaphragm surface (> 4m² for the XL subwoofers) so that the displacement of the diaphragms is always small and in the linear region.
  • Horns for the higher frequencies excellently adopt the small displacement of the diaphragms to the air.
  • The radiating characteristics of the bass is that way that they will not stimulate the room resonances.
  • We use a line array for the deep mid frequencies, to achieve the same dispersion characteristics as the one from the horns.
  • All speaker diaphragms are treated with carbon composite for a coherent sonic character form the deepest bass till the highest audible frequencies.
  • Carefully selected drivers so that a very simple crossover with finest quality components may be used.
  • To achieve the best possible quality, critical inductors and capacitors are made in house by SteinMusic
  • All interior cable are specially designed for exactly the given purpose and precisely made by SteinMusic in Germany.
  • The active integrated subwoofers make the speakers easy to drive with amps from 30 watts onwards.
  • The result is no typical speaker sound, but lots of music.