Mobile Fidelity Sound Lab — UDCD 624
The MFSL Ultradisc gold CD is highly regarded on SHF for its smooth, detailed and dynamic mastering.

The Unforgettable Fire was recorded primarily at Slane Castle in Ireland during 1984, with additional sessions at other locations including a converted castle setting that provided an unconventional recording environment. The album was produced by Brian Eno and Daniel Lanois, who brought experimental production techniques and atmospheric sound design that marked a significant departure from U2's previous work. Lanois served as engineer and co-producer, playing a crucial role in shaping the album's distinctive sonic character through innovative use of effects and ambience. The production process emphasized texture and atmosphere over the band's earlier post-punk directness, featuring prominent use of delay, reverb, and layered instrumentation. Released in 1984, the album represented a creative turning point for U2 and established a template for their subsequent stadium rock sound that would define the 1980s and beyond.
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Mobile Fidelity Sound Lab — UDCD 624
The MFSL Ultradisc gold CD is highly regarded on SHF for its smooth, detailed and dynamic mastering.
Mobile Fidelity Sound Lab — MFSL 1-207
4 releases share this master.
Island — U25
Island — 206 530 · Island — 206 530-620
Island — 7 90231-1
Island — 822 898-1
9 releases share this master.
Island — CID 102
Island — 610 194 · Island — 610 194-222
Island — 610 194-222 · Island — CID 102
Island — 7 90231-2 · Island — 90231-2
Island — A2-90231
Island Records Ltd. — 822 898-2
Island — D 53132
Island — 422‐822 898‐2 · Island — 7 90231‐2 · Island — 90231‐2 · BMG Direct Marketing, Inc. — D 154515
Island — CCID-102
Island — CDCID 102
Island — 90231-2
Island — UICI-9058
7 releases share this master.
Island Records Group — 1792417
Island — B0013201-02
Island — 2701403
Island — B0013367-00
Universal-Island Records Ltd. — 0060251792414
Universal-Island Records Ltd. — 0060252724645
Island — 5363999
Polystar — P35D-20002
Island — P24D-10052 · Polystar — P24D-10052
Island — PHCR-4837
UMC — 1443184272
CBS — 26209
Island — CID-102
Island — 422-822 898-2
Island — MMTCD 1988