DDA AMR24
A split-format British recording desk with a noise floor so low the engineers built an ad campaign around not being able to hear it.
Overview
The AMR24 is the console that put DDA on the map. One contemporary trade write-up called it "DDA's quiet rise to eminence." It arrived as a top-quality split recording desk with central status control. According to period press coverage, its sonic reputation rested on transparency and clarity few others could match. That reputation pulled in top producers and musicians alongside leading studios, across both analogue and digital applications. In the late 1980s that mattered, because a desk had to sound clean enough not to embarrass a digital multitrack.
That is the whole design thesis. DDA's own advertising copy argued that the conventional approaches to noise and crosstalk were perfectly adequate for analogue tape, but not good enough once a digital machine sat on the other end of the bus. So the AMR24 balanced all its inputs and outputs, and ran fully balanced mix buses to knock down crosstalk and give the desk real immunity to external fields. Every stage that isn't in use gets automatically bypassed, which keeps the signal path as short and clean as the circuit allows. The headline numbers are a dynamic range of 100dB+ and a minimum of 22dB headroom across the desk.
The EQ looks like a normal four-band setup at first glance. The peaking mode of the low-frequency band, though, uses a system where Q automatically increases as frequency decreases. That keeps the bass end precise instead of turning to mush when you push it, so the low band behaves more like a surgical tool than a broad shelf. The desk also carries a 26-way channel track assignment matrix, silent FET switches throughout, and multimode solo and mute with a failsafe master status control. It monitors two independent 24-track tape machines, with the two tape returns flippable locally or globally.
Frame and channel counts shifted over the model's life. Early advertising lists the AMR24 in 28, 36, or 48-channel versions across two frame sizes, with up to 68 mixdown inputs. A later dealer ad quotes 28, 36, or 44-channel versions with up to 92 mixdown inputs. Confirm the exact configuration against the specific frame on offer rather than assuming a standard. The jackfield is Mosses & Mitchell - the good stuff. Automation was retrofittable, and the desk could be ordered complete with Audio Kinetics' Mastermix automation running AK's special VCA faders, which stores and recalls four complete mixes in seconds.
PWL, Pete Waterman's Stock Aitken Waterman complex, chose a 36/24 AMR24 for a new room built for direct-to-digital recording with Sony 3324 machines. The reasoning given was the design brief itself: with every console on the market available to them, they wanted the shortest, cleanest signal path. Studio Sound (July 1988, p.38) reported the selection and the stated rationale.
By the early 1990s the AMR24 was moving through the used market at serious money, per dealer listings in Studio Sound. That was true even after newer DDA designs like the DCM232 had arrived. Buyers chasing one today should verify the automation package (Mastermix versus Optimix versus none), the exact channel count and frame size, and the condition of the FET switches and jackfield, the parts that matter most on a desk of this vintage. Parts and service support are the perennial question with any DDA of this era. The fact sheet here doesn't document current availability, so budget accordingly.
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