Marantz Marantz7
¥ 69,900 (1 unit, around 1972)
Commentary
A 3-way speaker system with a rubber grill.
A 30 cm cone type unit is used for the low range.
It is designed with low lowest resonance frequency, high input resistance and high efficiency in order to reproduce heavy bass of accurate pitch. Therefore, voice coil is wound in 4 layers on 7 cm bobbin, and magnet with high coercive force with little aging is used in combination with unique pole beads.
In addition, corn paper is also selected from the best pulp materials and coated with a special elastic agent from the peripheral part to the edge part to improve the distortion in the middle area which is important for audibility.
A 9 cm cone type unit is used for the middle area.
A 4.5 cm cone-shaped unit is used for the high range.
The edge part has an edge-less structure with the frame directly connected by a thin film of elastic agent coated on cone paper without using paper or cloth to avoid mechanical noise.
Model Rating
Method | 3-Way, 3-Speaker, Bass reflex system, Bookshelf Type |
Units Used | For low band : 30 cm cone type For Medium Range : 9 cm cone type For high pass : 4.5 cm cone type |
Impedance | 8 Ω |
Playback frequency band | 35 Hz to 20000 Hz, ± 5 dB |
Rated input | 30W |
Output sound pressure level | 90dB/W/m |
Distortion factor | 0.5% or Less (94 dB SPL at 1m, 50/500/5k/12.5 kHz 2nd and 3rd harmonic distortion average) |
External dimensions | Width 353x Height 633x Depth 285 mm |
Weight | 20.4kg |