DENON DSW-707
¥ 55,000 (1 unit, around 1997)
Commentary
Active subwoofer employing the newly developed P. P. D. D. system.
The P. P. D. D. (Push-Pull Dual Driver) Parallel method developed by DENON is used to enable powerful deep bass playback even though it is relatively small.
The p. P. D. D. Parallel method solves this problem by attaching the edge of one speaker in the opposite direction so that harmonic distortions cancel each other out, reducing low-frequency distortion.
In addition, since the two woofers are push-pull driven, the driving force and vibration equivalent mass are doubled, and the low-frequency reproduction range is expanded.
The unit is equipped with two 20 cm cone type woofers, and by connecting them in parallel, the effective diaphragm area is secured and the amplitude distortion of the speaker is suppressed.
This unit uses a wide rubber edge, a double bumper that reduces rolling, and an aluminum bobbin that increases durability and braking to reduce distortion.
In addition, the amplifier is equipped with a circuit to prevent unpleasant hard clips to the ear, thereby achieving high sound pressure.
A bass-reflex system is adopted for the enclosure, and 18 mm thick MDF material is used for the plate material.
In addition, by adopting an independent sealed amplifier, chattering is suppressed and unnecessary vibration is suppressed.
Equipped with an auto power off function that automatically goes into standby state when there is no signal for several minutes.
It returns to ON automatically when a signal is input.
There were 2 kinds of variations, wood grain finish and black finish.
Model Rating
Method | Built-in Amplifier / 1-Way / 2-Speaker / Bass Reflex System / Floor Type / Anti-magnetic Design |
<Woofer> | |
Units Used | For Ultra Low Band : 20 cm Cone Type x2 |
Playback frequency band | 20 Hz to 200 Hz |
Maximum output sound pressure level | 109dB |
Amplifier Unit | |
Maximum power output | 110W |
Input impedance | Line : 47k Ω High : 4.7k Ω |
Filter characteristic | 50 Hz ~ 200 Hz (Continuously Variable) |
Output terminal | Speaker system (L, R) Line out (stereo, mini jack) |
Pwer | 100 VAC, 50Hz/60Hz |
Power consumption | 78W |
<General> | |
External dimensions | Width 256x Height 560x Depth 410 mm |
Weight | 17.6kg |
Attachment | RCA pin code 2 Parallel 2-Core Cords Slip Stopper x4 |