![]() ![]() In addition to this extroverted construct, the 16.5 centimeter low-midrange driver seems almost homely at first glance. It takes the signal from the tweeter with an acoustic slope steepness of a full 24 dB/octave, which in turn is limited downwards with an even steeper 36 dB/octave. Speaking of the crossover – JBL claims to have donated high-quality components to it: Air-core coils, wire-wound resistors and metalized film capacitors are intended to carry out the signal split as smoothly as possible. Pulp Nonfiction – the low-midrange speaker The tweeter itself is a patented 25 mm compression driver with the unromantic designation “2410H-2”, which plays from a very low 1600 to a breezy 30000 Hertz (at -6 dB). It has a ring-shaped polymer membrane, which according to JBL is particularly light. The very stiff, V-shaped geometry of the annular membrane reduces distortion and standing waves in the membrane and eliminates phase errors, and dynamic compression is to be avoided at very high levels. Spoiler alert: This works great.Īccording to JBL, the upstream horn is also patented under the name “High-Definition Imaging” (HDI). According to JBL, the HDI horn geometry should ensure more even radiation in the room – at angles of 100 degrees horizontally and 80 degrees vertically, the frequency response between 2 and 17 kilohertz would remain within a range of -6 decibels, based on the maximum level in this frequency band. By the way, anyone who reads horn and thinks high efficiency is wrong. JBL only states an average of 87 dB/2.83V/m for the 4309 converted to the nominal impedance of 4 ohms, the characteristic sound pressure is 84 dB. ![]() The horizontally wide emitting tweeter horn is also not exactly the latest hi-fi optics standard, but a trademark of JBL loudspeakers and another reminiscence of the sixties and seventies of the last century. A small rotary control sits shamelessly underneath, with which the (super) high-frequency behavior can be influenced from 7000 Hertz with +/- 1 decibel in half-decibel steps. This does not correspond to the pure teaching of audiophile conservatism, but for many practical applications it is most likely more of an advantage than that the additional components and contacts do great harm. ![]()
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