ONKYO Scepter E-503A

Commentary

Scepter E-Series 3-way bookshelf type speaker system that uses Septor series speaker unit.

The Scepter E series employs Onkyo's original diffusion horn technology that allows spherical waves to be obtained with a horn.
In order to reproduce a spherical wave at the horn aperture, it is necessary to make the sound from the periphery come out later than the sound from the center of the horn. In the diffusion horn, the whole horn is considered to be an assembly of innumerable small horns, and the sound path is designed to become a detour so that the sound path becomes longer at the periphery. The square horn is used in the middle range, and the round horn is used in the high range. Both are designed based on the same concept.
This improves the pointing characteristic, which is a weak point of the horn.

In the low range, it is equipped with W-305A which is a 30 cm cone type woofer.
The newly developed lightweight cone and foamed neoprene rubber edge are used to reduce the weight of the vibration system.

The middle area is equipped with a horn type squaker.
A newly developed diffusion horn converts acoustic waves into spherical waves inside the horn, greatly improving directional characteristics, which was a weak point of the horn type.
In addition, ultra-hard duralumin foil diaphragm is adopted for the diaphragm, and the characteristics such as transient characteristics and strain characteristics are improved by active air braking in the back cavity, and the reproduction range in the low frequency range is also expanded.

A TW-1800A diffusion horn type tweeter is mounted in the high range.
The precision horn made of aluminum cutting work, combined with a unique diffusion mechanism, realizes natural sound quality with reduced horn odor. The diaphragm is made of ultra-hard duralumin foil, which provides excellent stress-strain characteristics compared with conventional materials.

The mid-range and high-range are equipped with level controls.

The enclosure is a 50L closed bookshelf type enclosure.

Equipped with multi-amplifier terminal.

Model Rating

Method	3-Way, 3-Speaker, Airtight Type, Bookshelf Type
Units Used	For Low Range : 30 cm Cone Type (W-305A) For Middle Range : Horn Type For High Range : Horn Type (TW-1800A)
Playback frequency band	30 Hz to 20 kHz
Max Input	60W
Rated input	30W
Impedance	8 Ω
Output sound pressure level	93dB/W/m
Crossover frequency	800 Hz, 9 kHz
Internal volume	50L
External dimensions	Width 376x Height 650x Depth 300 mm
Weight	19kg