Accuphase F-20/F-20M (1997)
A 2-way channel divider released in May 1997, built for high-precision multi-way speaker systems with modular crossover control.
Overview
The Accuphase F-20 and F-20M are 2-way channel dividers for multi-way speaker setups. They came out in May 1997 and use interchangeable crossover boards to set the frequency split. The F-20M was developed specifically for JBL's M9500 and Project K2S 9500/S7500 speakers, and it has a fixed -18dB/oct slope. The F-20 has switchable slopes of -12dB/oct, -18dB/oct, and -24dB/oct, set independently for the low and high channels. Both models take balanced and unbalanced connections, selected by a switch on the rear panel. Add a second unit and either one can run a 3-way system.
Specifications
| Type | Channel divider, 2-way dedicated multi-channel divider |
| Production year | May 1997 |
| Original price | F-20: ¥230,000; F-20M: ¥260,000 |
| Weight | 10.4kg |
| Dimensions | 475mm (W) × 150mm (H) × 395mm (D) |
Design
The F-20 has a balanced input/output circuit in a modular design built on alumina ceramics substrates, chosen for heat conduction. The filter is a GIC type with Gaussian characteristics. Crossover frequencies change when you swap in a dedicated frequency board. These boards are common with the F-25 and sold separately. The output stage is a modular balance circuit with dual feedback amplifiers. Each channel has a phase switch, and the LOW output has a selector for subwoofer integration. Level adjustment is independent per channel, from 0 to -20dB in fine steps, plus -∞. The F-20M adds a dedicated filter amplifier and the FB-650M board, which locks the slope at -18dB/oct. It shares the champagne-gold finish and the 100% in-house Japanese construction.
Context
The F-20/F-20M follows the technology of the F-25. An F-20 can be converted to F-20M specification after purchase for ¥10,000. Frequency boards come in 21 standard points from 70Hz to 12.5kHz, including FB-70 (70Hz), FB-100 (100Hz), up to FB-12500 (12.5kHz). The FB-650M is sold separately for ¥30,000.
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Service Manuals, Schematics & Catalogs
- Catalog — archive.org
- Catalog (1991) — archive.org
- Catalog (1992) — archive.org