Horn Technology
A horn has proven to be the best way to provide a perfect match of diaphragm movement to the air carrying the sound. So we have chosen this concept for the mid and high frequencies, as it significantly helps to obtain accurate low frequency information.
Horn technology is popularly used to increase the efficiency of a hi-fi speaker. However, this was not planned for the Bob XL, because in our opinion it usually leads to a somewhat thin and harsh sound. We also did not use compression drivers, for exactly the same reason. Instead, we put a lot of effort into achieving a perfect match between the horns and the drivers in the TopLine Bob XL horn speaker.
Open baffle
In the bass range, we opted for an open baffle. This way, the drivers are perfectly loaded on both sides in a balanced way. This is called the “open baffle principle”. Six of the bass speakers are mounted on each side of the cabinet, so we achieve excellent impulse compensation and very low resonances in the cabinet.
In addition, speakers with a large surface area should be used for the low frequencies. If smaller cone areas were used, they would have to be compensated by a larger excursion, which would then be much less linear. The large diaphragm area, on the other hand, requires a significantly reduced diaphragm excursion, so that the diaphragms always move within their linear range. This is how we get extremely low distortion in the TopLine Bob XL, and thus a really clean sound.
Carbon composite coating
In the lower midrange, five 10″ speakers with a total area of 320 square inches do their job, treated with a special carbon composite. The bass is reproduced by ten 12″ speakers that offer an area of more than 1500 square inches. The bass speakers were also treated with carbon composite.
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