DENON D-5
Price unknown (1 unit, around early 1970 s)
Commentary
A speaker system composed of high-end units.
The D-5 is configured to contain only the woofer unit in the enclosure, and other units can be freely located according to the condition of the room and preference.
30RW15 which is 30 cm cone type woofer is mounted in the low range.
This unit adopts an external magnetic structure using a solid aluminum die-cast frame and 16 high-purity Alnico system magnets of 30 φ x25mm. The top plate has a thickness of 15 mm and is uniformized with strong magnetic flux density together with 80 φ center pole.
The voice coil adopts edgewise winding, and in addition, the linearity is improved by using a new method with large air compliance with the voice coil.
A horn type unit using a driver unit HMD-9, an exponential horn, and a newly developed acoustic lens HL-65C is mounted in the middle range.
The HMD-9 uses a special light alloy 45 φ diaphragm, and is a rear type driver unit with precision hand-made processing. The magnetic circuit uses eight Alnico magnets 25 φ x15mm and eight 25 φ x20mm.
The HL-65C is a multi-layered structure consisting of a conical punching plate with different diameters at the opening of a horn-type speaker. This structure prevents the deterioration of directional frequency characteristics due to the influence of the vibration of the plate itself and the influence of reflection caused by the conventional thin flat plate acoustic lens.
A horn type unit is installed in the high frequency range.
Special light alloy It uses a driver unit with a diaphragm and a full-scale phase equalizer, and an aluminum-milled hyperbolic horn.
The enclosure uses a lumber core of 19 mm thickness made of carefully selected material for the entire surface except for the baffle.
It is also equipped with a variable acoustic resistance unit on the back to keep the playback limits and best transient characteristics.
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Model Rating
| Method | 3-way, 3-speaker, Acoustic Resistance Braking System, Floor Type |
| Units Used | For Low Band : 30 cm Cone Type (30RW15) For Middle Range : Horn Type (HMD-9 + HL-65C) For High Frequency : Horn Type |
| Frequency characteristic | Fo ~ 20 kHz |
| Directional characteristic at 60 ° | Fo ~ 15 kHz |
| Maximum allowable input | 80W (program source) |
| Impedance | 8 Ω |
| Average output sound pressure level | 93dB/W/m |
| Crossover frequency | 500 Hz, 7 kHz, 12dB/oct. |
| Level control | Mid-range and high-range variable |
| Cabinet Material | 19t, Lumber Core |
| External dimensions | - |
| Weight | - |
| 40RW01 Specifications | |
| Type | 30 cm Cone Woofer |
| On-axis sound pressure level | 93dB/W/m |
| Allowable input | 80W(Max) |
| VC impedance | 8 Ω |
| Frequency band | - |
| Voice coil diameter | 8cm |
| Magnetic flux density | 9,200gauss |
| Total flux | 345,000maxwell |
| Weight | - |
| HMD-9 Specifications | |
| Type | Driver unit |
| Allowable input | 40W |
| Frequency band | 500 Hz to 15 kHz |
| On-axis sound pressure level | 105dB/W/m |
| VC impedance | 8 Ω |
| Magnetic flux density | 18,000gauss |
| Total flux | 100,000maxwell |
| Weight | - |
| Specifications of HL-65C | |
| Horn type | Exponential horn |
| Horn aperture | 65mm |
| Length | 150mm |
| Acoustic lens | Diameter 217 mm |
| Lens configuration | Punching Metal 15 Sheets |
| Specifications of the high-frequency unit | |
| Type | Driver unit |
| Allowable input | 35W |
| Frequency band | 4 kHz to 20 kHz |
| On-axis sound pressure level | 99dB/W/m |
| VC impedance | 16 Ω |
| Magnetic flux density | 14,000gauss |
| Total flux | 35,000maxwell |