Audio-Technica AT-4047 (1999–)
A single-pattern capacitor microphone that skips pattern switching for the warm, transformer-coupled voice of classic FET studio mics. It found a quiet home in broadcast booths.
Overview
The AT4047/SV is a cardioid capacitor microphone with dual, gold-plated, aged large diaphragms and a transformer-coupled balanced output. The transformer is what gives the mic its sound. Audio-Technica's own advertising leaned on it, billing the mic as offering "the distinctive, warm sound of classic F.E.T. studio microphones" for what the copy called "a cold, cruel, digital world." Marketing copy is not a verdict, but the spec sheet backs up the pitch. A transformer-coupled output is a deliberate tonal choice, not a cost-saving one.
The published numbers are respectable on paper. Frequency response runs 20 Hz to 18 kHz. Self-noise is rated at 9 dB SPL, dynamic range is 140 dB at 1 kHz, and the capsule handles up to 149 dB SPL at 1 kHz at 1 percent THD. A switchable 80 Hz high-pass filter and a 10 dB pad round out the controls. So the mic stays quiet on a hushed voice-over and doesn't flinch when someone leans into it. The 149 dB ceiling is well past what most announcers will ever produce, and the 9 dB self-noise floor means the mic's own hiss sits far below room tone in a normal booth.
EQ (August 1999, p.81) ran a two-part review of the then-new AT4047/SV, with the second installment (p.84) getting into listening tests — including trying the mic on nylon guitar and on the Maryland Symphony Orchestra, where the reviewer found it smooth on top with no hint of overload, though he judged the nylon guitar not the best fit and wanted a more aggressive top end for that source. That's a fair sketch of the mic's personality: flattering and composed rather than bright and forward.
The physical design got attention in the period press as well. Mix (July 2000, p.144) field-tested the AT4047/SV and noted the internal shock-mounting that isolates the capsule from noise and vibration. That helps on a stand in a live room, or in a booth with a computer fan humming nearby. The same review observed that the shock-mount surrounds the lower portion of the mic's main cylinder and still leaves access to the Low Cut and Pad switches.
Mix's review noted that Audio-Technica had, at that point, spent nearly four decades building electroacoustic products and had earned a reputation for durable designs. The AT4047/SV was positioned as a workhorse rather than a trophy. In broadcast circles the single-pattern AT4047/SV attracted interest notably in the public broadcasting sector, according to Mix (July 2000, p.144). It also appears on the partial equipment list for Jazz at Lincoln Center's facilities, alongside a long roster of far more expensive condensers.
The AT4047/SV is not a multi-pattern mic. The single cardioid pattern is a deliberate trade-off, and it's the reason the mic could be built at a price that made sense for a broadcast station that had already sunk money into its air chain. Buyers who need omni or figure-8 should look elsewhere in the line. Buyers who mostly record voice and close-miked sources will never miss the switch.
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