Accuphase F-25V/F-25VM (2001)
Multi-channel divider for active crossover systems, released February 2001.
Overview
The Accuphase F-25V and F-25VM are multi-channel dividers for active speaker management, made by Accuphase Laboratory, Inc. (originally Kensonic Laboratory, Inc.). Both came out in February 2001. The F-25V has switchable filter slopes of 12dB/oct., 18dB/oct., or 24dB/oct. The F-25VM is fixed at 18dB/oct. because of its dedicated DN-25VM filter amplifier unit. The F-25V is modular, with detachable filter and line amplifier units. A standard 2-way setup can grow to up to 4-way with optional components. Both models have fully balanced inputs and outputs, Gaussian-type filter curves, and GIC-type filter circuits for frequency division.
Specifications
| Maximum Input Level | 7.0V (Balanced/Unbalanced, ≤0.01% THD, 20Hz–20kHz) |
| Total Harmonic Distortion | 0.003% (20Hz–20kHz, 2.0V output) |
| Frequency Response | 20Hz–20kHz +0/-0.2dB; 4Hz–180kHz +0/-3.0dB |
| Gain | 0dB |
| Crossover Frequency | Adjustable via interchangeable board; 21 standard points |
| Crossover Characteristic | -3.0 dB ±5% |
| Slope Characteristic | -12dB/oct., -18dB/oct., -24dB/oct. (switchable on F-25V) |
| Input Impedance | Balanced: 40kΩ, Unbalanced: 20kΩ |
| Output Impedance | Balanced: 50Ω, Unbalanced: 50Ω |
| S/N Ratio | 100dB (0.5V output, IHF-A weighted) |
| Minimum Load Impedance | 600Ω (Balanced/Unbalanced) |
| Attenuator | 0dB/10dB (per line amplifier via internal switch) |
| Level Adjustment | Per band, L/R independent: 0 to -8dB (0.5dB steps), -8dB to -20dB (1dB steps), -∞ |
| Power Supply | 100VAC, 50Hz/60Hz |
| Power Consumption | 32W |
| Dimensions | 475mm (W) × 170mm (H) × 394mm (D) |
| Weight | 15.4kg |
Design
The F-25V puts the filter and line amplifiers in a modular, panel-mounted unit, which makes it easy to service and expand. It uses a GIC-type filter circuit with Gaussian characteristics and an s-Gretta current feedback amplifier for stable high-frequency phase response. Each band has a phase inversion switch and its own level control. The F-25VM adds the dedicated DN-25VM filter amplifier and the FB-25M frequency board, built to emulate the behavior of a speaker LC network. It is specifically meant for bi-amping JBL M9500 and Project K2S 9500/S 7500 speakers. A rear-panel switch lets you mix the left and right ultra-low-frequency signals.
Context
The F-25V and F-25VM belong to Accuphase’s professional-grade signal processing lineup and are aimed at high-end active speaker systems. Install the DN-25VM and FB-25M and an F-25V meets F-25VM specifications. The F-25V handles up to 4-way operation with additional modules, while the F-25VM is optimized for 2-way bi-amp use. Compatible units include LA-25, DN-25, LA-25V, and DN-25V. Panel color and control steps differ between them, so mixing parts takes some care.
Market
The original price in February 2001 was ¥390,000 for the F-25V and ¥440,000 for the F-25VM. Optional components included the Line Amplifier Unit LA-25V (¥60,000), Filter Amplifier Unit DN-25V (¥60,000), and frequency boards (¥15,000 each). Converting an F-25V to F-25VM required upgrading the DN-25V circuit (¥20,000) and adding the FB-650M board (¥30,000), sold separately.
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Service Manuals, Schematics & Catalogs
- Catalog — archive.org
- Catalog (1991) — archive.org
- Catalog (1992) — archive.org