From a sonic standpoint and with good enough speakers or headphones the only continuity between all of these ‘UK Bass/Future Bass/Bass’ tracks aside from not having any or very minimal vocal usage is the application of a polyrhythmic subsonic bass line. Emphasize the use of an LFO (Low Frequency Oscillator) on the bass line to create a mid-range wobble effect, minimize the use of percussion running at the same tempo as ‘Dubstep’ and you can have what is commonly referred to as ‘Brostep’:
Tracks that are labeled as being ‘Garage’, ‘Dubstep’, or ‘UK Bass’ would be considered by many to be sound system specific. As said before the tracks contain sub-sonic bass lines. These sub-sonic bass lines are low frequencies that are supposed to be felt as much as they’re supposed to be heard. However, these frequencies cannot be physically felt and heard properly through laptop speakers or on a sound system with no subwoofers which could be a possible correlation to the ongoing popularity of ‘Brostep.’
Ease of Access, Ease of Consumption
The heavy application of the LFO to create mid-range and high frequencies in the majority of ‘Brostep’ tracks can be heard on a wide range of output devices-laptops, earphones, smartphones, venues with loudspeakers but no subwoofers. From a sonic standpoint it’s just much more accessible-what you hear is what you get, there are no subtleties within the composition of ‘Brostep’ tracks as there is with a ‘Dubstep’ track comprised of spatial atmospherics layered over polyrhythmic bass lines. As a result the sonic accessibility of ‘Brostep’ has gained a larger and wider appeal particularly amongst the young adults in North America as evidenced by the popularity of artists such as Rusko, Skrillex, Borgore, Datsik…and Korn (?!)