Audio Database

The

Pioneer HPM-100
62,000yen(one-set, around the 1977 time)

Description
 
The 4 ways speaker system which adopted the diaphragm by a high polymer element.

A carbon fiber mixing cone is used for the cone paper of a Woofer, and also the special sound dumping agent is coated in the top layer. Moreover, the frame holding a diaphragm and a magnet is a product made from firm aluminum die-casting. The design which stops a higher-harmonic distorted component with a long voice coil, the copper cap of a large-sized magnet and a center pole, etc. is carried out to the magnetic circuit.

A squawker thinks a directivity as important, and does not make it a large diameter, but the cone type of 10cm is being used for it.
A diaphragm is the lightweight cone paper which improved the rigidity developed newly. In a magnetic circuit, the large improvement in efficiency is aimed at with a large-sized magnet and an edgewise volume voice coil, and distortion is reduced to the center pole using a copper cap.

While attaining a stabilization of a property in a tweeter at a frame using aluminum die-casting, the adhesives of the epoxy system are used for the adhesion of a voice coil assembly and cone paper.

The unique piezoelectric type speaker which uses a high polymer element for a diaphragm is adopted as a super tweeter. This high polymer has many special features, such as vibration system is "lightweight", "a directivity being good since it is a complete drive type", there "there being little disorder of the property by vibration", and "the Dainyuu power being borne."

The enclosure has adopted the bass-reflex type.
Moreover, a simple circuitry form which adopted MP type capacitor with few losses in a network, and thought the phase response as important is taken.


Rating of a mode
Scheme 4 ways, 4 speaker bass-reflex scheme, and a bookshelf type
Using unit For low-pass: 30cm cone type
For mid ranges: 10cm cone type
For high regions: 4.5cm cone type
For high super regions: High polymer type
Impedance 8ohm
Play frequency band 30Hz - 25000Hz
Output sound pressure level 92.5dB/W/m
The maximum input 100W
Cross over frequency 3000Hz, 4000Hz, 12000Hz
Dimensions Width 390x height 670x depth of 393mm
Weight 26.7kg