PHILIPS AH585
¥ 89,000 (1 unit, around 1980?)
Commentary
An active speaker system using the MFB method.
In the MFB method, the piezoelectric element (PXE) mounted on the top of the cone paper of the woofer detects the acceleration of the cone paper and converts it into voltage. The voltage and input signal are compared with each other using a comparator. This makes it possible to make the reproduced sound wave identical to the original waveform and to cancel the distortion component forcibly.
It is a 2-way multi-amplifier configuration. The input signal is divided into mid - and low-frequency ranges by an electronic crossover network, and each is driven by a dedicated amplifier.
It has an 18 cm cone woofer in the low range and a 2.5 cm dome tweeter in the high range.
Model Rating
| Method | Built-in Amplifier / 2-Way / 2-Speaker / MFB Method / Bookshelf Type |
| Units Used | For low band : 18 cm cone type For high-pass : 2.5 cm dome type |
| Frequency characteristic | 35 Hz to 20 kHz |
| Output sound pressure level | 105dB |
| Crossover frequency | 1.7kHz |
| Amplifier output | Low band : 30W For high frequency : 5W |
| Amplifier harmonic distortion | 0.1% or Less (25W) |
| Power supply voltage | 100 VAC, 50Hz/60Hz |
| Power consumption | 60W |
| External dimensions | Width 229x Height 348x Depth 197 mm |
| Weight | 8.1kg |