Needs new belt.

The Denon DRW‑840 is a high-quality, service-friendly, double cassette deck aimed at audio enthusiasts. With dual autoreverse decks, Dolby B/C noise reduction, HX-PRO, manual bias adjustment, and strong sound performance, it remains a beloved classic even decades after its release. If you’re hunting for a dependable analog cassette recorder/player, it’s definitely worth considering—especially if well-maintained or professionally serviced.

🎛️ General Overview
• Type: Auto-reverse double compact cassette deck
• Manufactured: 1993–1996 (some sources mention 1996–1999) in Japan
• Color: Black
• Weight: ~4.4 kg (approx. 9–10 lb)

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🔍 Transport & Tape Mechanics
• Track system: 4-track, 2-channel stereo
• Tape speed: 4.8 cm/s
• Drive: Dual-capstan, dual-reel motors with autoreverse on both decks
• Heads: 2 record/playback + 2 erase
• Tape support: Type I, Type II (CrO₂), Type IV (Metal)

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🔧 Recording & Noise Reduction
• Noise systems: Dolby B, Dolby C, with HX-PRO headroom extension
• Bias: Manual fine-tuning available (Bias Fine Regulator)
• Copy options: Relay, twin, synchronized dubbing; supports high-speed copying

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📈 Performance Specs
• Frequency response:
• 20 Hz–18 kHz (Metal tape)
• Extended to 19 kHz ±3 dB per some listings
• Signal‑to‑noise ratio: 74 dB (Dolby C)
• Wow & flutter: 0.06%

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🛠️ Inputs, Outputs & Controls
• Inputs: 80 mV line-level RCA; synchro input
• Outputs: 0.775 V RCA line-level; 6.3 mm headphone jack
• Display & functions: Tape counters with memory stop, level meters, search system, rec mute/pause
• Remote: Supported (encoder not always included)

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📏 Dimensions & Build
• Size: ~434–435 mm W × 124–135 mm H × 275 mm D
• Build quality: Solid Denon chassis, reliable mechanics