What is stereo?




There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.




H.H. Scott '59





JBL 4401


Features:
Smooth, accurate response from 70 Hz to 18 kHz (±3 dB)
88 dB SPL 1W/1m (3,3ft)
Components:  170 mm (6-1/2 in) low frequency loudspeaker; 25 mm (1 in) high frequency dome radiator
Oiled walnut enclosure
Optinal steel cradle mount

The most compact of the JBL studio monitors, the 4401 is ideal for use as a main monitor in applications where space is at a premium. The tight driver cluster gives the 4401  outstanding coherency in the near field, making it also an excellent choice for a console-mount secondary monitor.
The 4401 shares the design philosophy of the larger JBL4430 and 4435 monitors, smooth response over a wide coverage angle, with wide dynamic range and clear, open sound. Particular attention has been paid to the design of the dividing network and to the physical placement of the drivers. Each driver is the product of extensive research and testing, and each has been designed for optimum performance in the system.

High Frequency Dome Radiator
Today's recording techniques place a premium on high frequency accuracy and definition, and JBl has designed the 4401's high frequency dome radiator to meet these demands. The dome is formed of a lightweight phenolic material and coated with a microscopiclly thin layer of aluminum through a sophicticated vapor-deposition process. The hard dome construction provides smooth response with higher efficiency  and acoustic output than a comparable soft dome. Additionally, the driver exhibits outstandings linearity over its full operating range - there is virtually no power compression.

Low Frequemcy Driver
The 4401 utilizes a low frequency driver specially designed for optimum performance in a compact enclosure. The 1700 mm  loudspeaker exhibits unusually  smooth frequency response, superior transient response, and extremely low distortion. It features a die-cast aluminum frame for structural integrity under the most adverse operating conditions.

Symmetrical Field Geometry Design
The loudspeaker's magnetic strukture features JBL's unique Symmetrical Field Geometry (SFG) desin to reduce second harmonic distortion to less than one tenth the level found in conventional designs. The cone is of laminated construction to achieve the desired combination of light weight and rigidity. The coating, and exclusive JBL formulation, adds, a precise amount of mass and provides optimum damping characteristic .  Carefully engineered suspension elements reduce DC offsets and an unusually long voice coil allows exceptional excursion linearity.

Frequemncy Dividing network
The sophisticated dividing network contributes significantly to the overall performance of the system. The carefully chosen transition slopes and crossover point provide flat axial response and minimize off-axis variation, so that power response is also smooth. The design allows a more predictable interface of the 4401 qand the studio environment. Stereo imaging also remains stable over a wider area.
 to take full advantage of the inherently excellent transient response of the two drivers. JBL engineers applied a principle typically found only in active high frequency electronics. Polypropylene and polystyrene bypass capacitors are wired in parallel  with the network's larger  Mylar capacitors to reduce the hysteresis effects on the signal. This provides improved resolution of complex transient waveforms.
The network's iron-core and air-core inductors are carefully chosen for their high current capacity and low DC characteristics. A high frequency level control protrudes through the grille for individual adjustments to the spectral balance.
To simplify wall or console mounting, the 4401 may be ordered with optional cradle mounts manufactured of rugged steel.

SPECIFICATIONS
System
Frequency Response: 70 Hz to 18 kHz (±3 dB)
Power Capacity:  60 W
Sensitivity:  88 dB SPL
Nominal Impedance:  8 Ω
Crossover Frequency:  2,500 Hz
Low Frequency Loudspeaker
Nominal Diamater:  170 mm (6-1/2 in)
Voice Coil:  38 mm (1-1/2 in)
Magnetic Assembly Weight:  1,3 kg (3 lb)
Flux Density:  0,95 tesla (9,500 gauss)
Sensitivity:  89 dB SPL
High Frequency Dome radiator
Nominal Diameter:  25 mm (1 in)
Voice Coil:  25 mm (1 in ) copper
Magnetic Assembly Weight:  0,68 kg (1-1/2 lb)
Flux Density:  1,4 tesla (14,000 gauss)
Sensitivity:  89 dB SPL
General
Finish:  Oiled walnut
Grille Color:  Dark blue
Dimensions (W x H x D):  375 x 238 x 183 mm
Weight:  16 kg (shipping)
Optional Equipment:  MC 4401 Speaker Cradle for free standing use or wall mounting

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