Thứ Tư, ngày 27 tháng 4 năm 2011

AR(Acoustic Research) AR-90


The
AR(Acoustic Research) AR-90
198,000 yen(around the one-set and 1980 time)

Description
 
The Tallboy type speaker system of the vartical series which inherited the main designs of AR-9 and realized the miniaturization further.

Two 25cm corn type Woofers are carried in low-pass, and little distorted low-pitched sound play is realized by installing in enclosure both sides.

The same 20cm corn type Woofer as AR-9 is carried in inside low-pass.
The natural vocal play is realized by having prevented the mutual intervention by mounting to the subenclosure, and also making this unit take charge of 200Hz - 1200Hz which is a vocal zone.

a crown -- the unit of a 1.9cm dome shape is carried in the 3.8cm dome shape and the high region in the region.
The same thing as AR-9 is adopted like [ these units ] inside low-pass, the magnetic fruid of the shape of colloid which is tinged with the magnetism of NASA development was put in between the voice coil and the yoke, and the input-proof is improved while aiming at distorted reduction from a central axis as a structure as for which Bure is not.

A "17AWG sky core coil", a "computer class electrolytic condenser", "input-proof [ unguided quantity ] ceramic resistance", etc. are used for the network portion.

The acoustic suspension system of AR tradition is adopted as the enclosure.
By this system, air can achieve the duty of a spring by carrying out full sealing of the core, compliance can be enlarged, and it is possible to make low-pass resonance frequency lower.
Moreover, the acoustic blanket which is a special sound-absorbing material was attached to the surroundings of a driver unit, and sound quality degradation by reflective sound is prevented.
Finishing is walnut oil finishing.


Rating of a mode
System 4 ways, 5 speaker acoustic suspension system, and a Tallboy type
Use unit For low-pass: 25cm corn type x2
For inside low-pass: 20cm corn type
a crown -- : for regions -- a 3.8cm dome shape
For high regions: 1.9cm dome shape
Frequency response 23Hz - 30kHz
Low-pass play frequency 32Hz -3dB
System Q 0.8
Output sound pressure level 87dB/W/m
Impedance 4ohms (a minimum of 3.2ohms)
The continuation maximum input 150W
The maximum input 300W
Crossover frequency 200Hz, 1.2kHz, 7kHz
Level control Inside low-pass: Three-step switching
mid-high range: three-step switching
High region: Three-step switching
Content volume 90L
Dimensions Width 368x height 1102x depth of 386mm
Weight 37kg

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