Напольная акустика — JBL 4367

The 4367 is a two-way floorstanding Studio Monitor from JBL, sold under the JBL Synthesis banner of HARMAN in Northridge, California. It replaced the 4365, a 2010 three-way design that combined a 1501FE-8 woofer with a 476Mg compression driver and an 045Ti-1 ultra-high-frequency unit. The 4367 drops to two drivers, returning to the single-crossover layout JBL used in the 1950s and 1960s, and it keeps the exposed horn and blue front baffle of the brand's traditional monitor styling. JBL aims it at stereo systems or at the LCR positions of a Synthesis cinema.

Key specs that matter

Low frequencies go to the 15 inch (380 mm) 2216Nd-1 with an Aquaplas-treated Pure Pulp cone, a cast aluminium frame and a neodymium Differential Drive motor with two 3 inch voice coils in two gaps. Above 700 Hz the D2430K takes over, a 3 inch (75 mm) compression driver with two annular polymer diaphragms, two voice coils and two neodymium motors. Response is 30 Hz to 40 kHz at -6 dB, sensitivity is 94 dB at 2.83 V and 1 m, and nominal impedance is 6 ohm. The cabinet stands 941 mm high, 560 mm wide and 425 mm deep, and each speaker weighs 54 kg.

Engineering and use context

Splitting the moving mass across two light diaphragms gives the D2430K a lower mass-to-motor force ratio than a single-diaphragm driver of the same size, and JBL states more than double the usual power handling, while the second motor helps shed heat and reduce power compression. Because one driver covers both high and ultra-high frequencies, they come from a single coincident source. It loads into an HDI waveguide horn moulded from BMC (bulk moulding compound), with 110 degrees of horizontal and 50 degrees of vertical coverage to limit floor and ceiling reflections. The woofer has a 28 Hz free-air resonance and about 7 mm of peak-to-peak linear excursion. Cabinet walls are 1 inch MDF with a further 5/8 inch surface baffle below the horn and two braces linking the vertical panels, and two 4 inch dual-flared ports vent at the front. The network uses separate boards for each driver, air-core inductors and polypropylene-foil capacitors. Front HF and UHF trims each adjust from -1 dB to +1 dB in 0.5 dB steps, over 600 Hz to 9 kHz and 4 kHz to above 20 kHz respectively.

Pairing

JBL suggests amplifiers of 25 to 300 W RMS. The high efficiency lets modest amplifiers reach useful levels, while two sets of gold-plated five-way posts on the rear, linked by heavy-duty jumper wires, let owners feed the woofer and horn networks from separate cables or separate amplifier channels. Finishes are Walnut and Black Walnut.

Alternatives

The JBL Project Everest DD67000 is a larger three-way floorstanding model with twin woofers, pure-beryllium compression drivers and a 96 dB sensitivity rating.