United Studio Technologies UT Twin87 Studio Condenser Microphone

United Studio Technologies UT Twin87 — Two 87-Style Circuits in One Studio Workhorse

United Studio Technologies UT Twin87 is a large-diaphragm twin-circuit condenser microphone delivering the sonic character of both the original vintage U87 and its later "Ai" revision. Inside the nickel-plated brass body sits a custom 34 mm dual-diaphragm K87-style capsule and a US-made transformer with nearly four times the metal mass of typical 87-style designs. A front-panel switch re-routes the entire circuit topology, moving from a warmer vintage voicing to a brighter modern voicing in seconds. This model is the right choice for studios wanting one microphone to cover vocals, voiceover, acoustic instruments, and broadcast.

What Sets the Twin Circuit Apart

Unlike microphones that simply EQ between two presets, this instrument physically toggles between two discrete circuit topologies. In Vintage mode the capsule is polarized directly by +48 V phantom power; in Modern mode an internal FET oscillator raises polarization to about 63 V. A switchable RF/EM output filter, accessible via an internal DIP switch, lets engineers decide whether the filter helps or harms the sound. When set to cardioid, the rear diaphragm is decoupled — the "true-cardioid mod" — yielding a hotter, more focused pattern.

Custom K87-Style Capsule — Sonic Foundation

The capsule is the heart of any condenser microphone, and United developed the UT-K87 in-house rather than sourcing an off-the-shelf part.

• Capsule: 34 mm brass, insulated dual backplate, K87-style — the geometry that defines the classic U87 sound
• Dual-diaphragm construction uses 6 µm Japanese PET film and 24k gold sputtering applied in a clean-room environment, which stabilizes the membrane against humidity drift.
• Capsule Sensitivity: -34 dB at 60 V polarization — strong output level that keeps preamp gain requirements modest.

Twin Circuit Topology — Vintage or Modern on Demand

The defining feature is the ability to physically reconfigure electronics rather than apply a digital voicing.

• Operating Modes: Vintage (direct phantom-power polarization) and Modern (FET-boosted about 63 V polarization) — two distinct voicings in one chassis.
• Three switchable polar patterns (cardioid, omnidirectional, and figure-of-8) enable coverage of single-source, room, and complex stereo techniques.
• High-Pass Filter: 80 Hz, 12 dB down with gradual slope — tames proximity effect on close-miked vocals.
• Pad: -10 dB — extends usable SPL for loud sources such as brass, drums, and guitar cabinets.

Build Quality, Power Requirements, and What's in the Box

Built to last decades with a solid-brass body and hand-selected internal components.

• Body: Nickel-electroplated, solid milled brass — substantial feel and excellent RF shielding.
• A custom-wound, US-made output transformer featuring nearly 4× the iron mass of typical 87-style designs provides an open, three-dimensional sound with deep low-end reach.
• Power & Output: 48 V phantom power via 24k gold-plated XLR (pin 2 hot) — standard studio supply, corrosion-resistant contact for long cable runs.
• Self Noise: <10 dB (no pad, no HPF) — quiet enough for intimate vocal and acoustic work.
• Dimensions & Weight: 220 mm × 55 mm; 0.75 kg mic / 1.05 kg with shockmount — fits standard shockmounts and sits solidly on a stand.
• Package Contents: Manual, suspension shockmount, vintage-style carrying pouch.

Engineers, Producers, and Project Studios Seeking a Flexible Workhorse

The UT Twin87 is the right choice for recording engineers and producers who need one microphone that adapts to whatever the session throws at it. Project-studio owners wanting a vintage U87 sound without the vintage U87 price tag will find Vintage mode remarkably close to a 1971 original, while engineers preferring a brighter, more contemporary top-end reach can switch to Modern mode without changing mics. Voiceover artists, broadcasters, and podcasters benefit from the built-in high-pass filter, the -10 dB pad, and the true-cardioid mod that delivers a clean, focused on-axis capture.

United Studio Technologies — Boutique Microphone Design from the Ground Up

This boutique manufacturer is known for designing every key component in-house rather than outsourcing capsules, transformers, or circuit topologies. The brand's debut microphone, the UT FET47, was reviewed in Sound on Sound in late 2020 and praised for capturing the Neumann U47 FET sound at a fraction of the price. Every component — from the 34 mm K87-style capsule to the US-made transformer — was developed specifically for this microphone. The 0.75 kg solid-brass body houses a circuit that physically toggles between two topologies.