JERN 12XF
JERN 12XF
JERN 12XF
The JERN®12 XF is developed to work without a subwoofer in small rooms close to the walls. Rubber rings medfølger.
It is an elegant design, and it delivers an audio quality like no other small loudspeaker.
Its shape, the selected components and the extraordinary cabinet material are the keys
to the superior sound quality.
Danish design
Casting in iron allows our designers and engineers to create this new, rounded and organic shape.
The shape and the strong heavy material both increase the sound quality.
JERN is the Danish word for iron.
The best cabinet shape
The spherical shape gives the smoothest frequency response, and
the lowest amount of diraction sounds disturbing the music.
This has been known for many years, see page 23 of PhD
Harry F. Olsons book “Elements of Acoustical Engineering” from
1957 in our 8 page brochure.
Therefore the cabinet is shaped like 2 spheres melted together.
The cabinet is 30 cm tall, 19,5 cm deep and 21 cm wide.
An easy load for your amplier
The nominal impedance of 4 ohms makes the JERN 11, 12XF
and 12WS an uncomplicated load for good ampliers.
The sensitivity is 86 dB (2,83V 1m).
Cabinet advantages
The closed cabinet means that there is no annoying bass
reex resonance or noise from the port.
The impulse response is faster. The bass is better dened.
Optimum placement in your small listening room
The JERN11, JERN12XF and 12WS are optimized for a close to the wall
loudspeaker placement. The closed cabinet has only 12 dB per octave
reduction below 65 Hz. The normal room gain bass increase means that
it is possible to get good bass down below 40 Hz.
In his review in HiFi Pig, Paul Messenger measured down to 32 Hz, when the listener sit close to the opposite wall.
Sustainability
The cast iron cabinet has a lifespan of more than 100 years and it is made of recycled material, except for the
color paint. The JERN11 and 12 are elegant loudspeakers with revolutionary technology.
They oer you a unique, musical sound experience!
Tekniske data
Design
Two way. Phase linear wide dispersion design. Sealed cabinet for best transient response.
Drive Units
Unique Wavecor woofer 5 3/4 inch 146 mm frame.
Excellent midrange performance due to a new wowen and optimized glass fibre cone design. Fibre Glass Cone
– Rigid steel chassis with extensive venting for lower air flow speed reducing audible distortion
– Vented center pole with dual flares for reduced noise level at large cone excursions
– Heavy-duty fiber glass voice coil former to reduce mechanical losses resulting in better dynamic performance and low-level details
– Large motor structure for better control and power handling
– Built-in alu field-stabilizing ring for reduced distortion at high levels
– Low-loss suspension (high Qm) for better reproduction of details and dynamics
– Black plated motor parts for better heat transfer to the surrounding air
– Conex spider for better durability under extreme conditions
Gold plated terminals to ensure long-term trouble free connection
– Delivered with foam gasket attached for hassle-free mounting and secure cabinet sealing
The JERN12 XF version has a 19 mm Seas tweeter. Up to 32 kHz
– The tweeter frame is damped by a 3 mm thick sheep wool felt disc with a star shaped cutout for the dome.
– This disc also reduce the soundwaves traveling out from the dome on the tweeter surface to the edge, and thus makes frequency response smoother.
– Dimensions 30 cm tall, 19,5 cm deep and 21 cm wide. Net weight 12,2 kg
Frequency response
45 – 20.000 Hz in room, -6dB at 65 Hz in anechoic chamber
Comments
These loudspeakers are developed to work really well close to walls
Crossover
The phase linear 6dB/octave custom-made crossover uses a Mundorf polypropylen capacitor and an large air core coil. It delivers a fine 3D soundstage.
Amplifier requirements
25 – 150W / 4 Ohm Sensitivity (2.83V/1m) 86 dB Impedance 4Ω
Accessories
The rubber ring is included with each JERN12.