EMT 251 (1980–ca. 1985+)
The EMT 251 is the second-generation digital reverberator that followed the EMT 250. It came out in 1980 with better high-frequency response, an LCD readout for parameter indication, and more program options than its predecessor. Recording Engineer (December 1980, p.89) noted that the first unit was delivered to Sunset Sound Studios in Hollywood, with further shipments to Moonbeam and others. The 251 kept the "space machine" look of the 250, but the inside was quite different.
The 251 samples at 32.75 kHz with 16-bit resolution. It measures 535 mm × 830 mm × 280 mm and weighs 45 kg. Program names include REV (main reverb), NON LIN (non-linear), and 250 REV (reverb), which likely refers to the EMT 250 algorithm. Reverberation time is adjustable, with a bass (300 Hz) factor of 0.5 to 2 and a mid-range (4 kHz) factor of 0.2 to 0.85. The 251 stayed in production at least through mid-1985, alongside the smaller EMT 245.
- Sampling rate: 32.75 kHz
- Bit depth: 16-bit
- Dimensions: 535 × 830 × 280 mm
- Weight: 45 kg
- Display: LCD
- Known programs: REV, NON LIN, 250 REV
- Successor: EMT 252
Used prices in the mid-2000s ranged from $3,500 to $5,000; one auction unit fetched $5,760 (plus buyer’s premium). Common owner-reported issues include noisy outputs and slow or noisy fans. Studio Electronics offers repair and service, and an upgrade kit that adds the original EMT 250 reverb program is available. The EMT 251 remains a sought-after classic for its distinctive, character-rich digital reverb.
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