Warm Audio WA-84 Cardioid Condenser Microphone, Matched Stereo Pair (Nickel)

Warm Audio WA-84 Matched Pair: Stereo KM84-Style Capture in Nickel

The Warm Audio WA-84 Matched Stereo Pair brings two KM84-style pencil condensers, factory-matched for consistent tone, in a classic nickel-finish set built for stereo recording. Each microphone recreates the classic KM84 with a fully discrete Class A circuit, a CineMag USA transformer, and a Fairchild FET for accurate, naturally detailed sound. Matching the two mics is what makes them ideal for drum overheads, acoustic ensembles, and pianos, where a balanced, phase-coherent stereo image is essential. A switchable 0 or -10 dB pad on each mic handles loud sources, and the cardioid pattern keeps the focus tight. The pair ships with two shockmounts, two clips, two windscreens, and a case, ready for stereo work. For engineers who record in stereo, a matched pair removes the guesswork of pairing two separate microphones.

How a Small-Diaphragm Condenser Works

A small-diaphragm condenser, often called a pencil microphone, uses a tiny charged diaphragm and backplate to capture sound with exceptional speed and accuracy. Because the diaphragm is small and light, it responds to fast transients and high frequencies with more precision than a large-diaphragm mic, which is why pencil condensers are the classic choice for acoustic and percussive sources. That signal is amplified inside the microphone by a field-effect transistor and runs on standard 48V phantom power, so setup is simple. A cardioid pattern keeps the focus on the source in front and rejects the rear, helping control bleed in multi-mic setups. The trade-off for a small capsule is slightly higher self-noise than a large diaphragm, offset here by careful circuit design. Understanding that speed and accuracy explains why the KM84-style sound is so prized on acoustic instruments.

Discrete Class A, CineMag Transformer, and Fairchild FET

The WA-84 is built as a fully discrete Class A circuit, meaning its gain stages use individual components running in the smooth, detailed Class A mode rather than a single integrated chip. That signal passes through a CineMag output transformer made in the USA, a component that lends the microphone its cohesive low end and a touch of vintage character. A Fairchild FET handles the capsule's high-impedance signal, and polystyrene and WIMA capacitors shape an accurate, vintage-correct tone throughout. These are the same class of premium components Warm Audio uses across its acclaimed lineup, chosen to track the original KM84 rather than approximate it. The result is a natural, detailed sound with just enough character to feel musical. It is the parts inside that make this more than a generic pencil condenser.

Controls and Sources That Shine

The WA-84 includes a switchable pad offering 0 or -10 dB, raising its maximum SPL to 133 dB so it can take loud drum overheads and close percussion in stride. On acoustic guitar it captures string detail and body without harshness, and on drum overheads and hi-hat it renders cymbals with natural, airy definition. It is equally at home on piano, mandolin, and other stringed instruments, and it excels as an orchestral and ensemble microphone where accuracy matters. Live sound and broadcast engineers value its detailed, controlled tone and its compact, easy-to-place body. The cardioid pattern helps isolate each source in busy multi-mic setups, keeping bleed under control. Wherever fast, natural, accurate capture is the goal, the WA-84 is in its element.

Why a Matched Pair Matters

Stereo recording depends on two microphones that sound as close to identical as possible, because any tonal or level difference between them blurs the stereo image. Warm Audio selects the two WA-84 microphones in this nickel set so their responses closely match, giving you a balanced, believable stereo picture from the first take. That matching is especially valuable on drum overheads, keeping the kit centered and the cymbals even across the field. It also pays off on stereo acoustic guitar, piano, choirs, and orchestral sections that need an accurate spatial image. Choosing a factory-matched pair spares you the tedious work of testing individual mics to find two that agree. For serious stereo recording, the matched pair is the right tool from the outset.