Universal Audio SP-1 Pair: Five Iconic Small-Diaphragm Condensers in One Matched Stereo Set

The Universal Audio SP-1 is a factory-matched pair of small-diaphragm pencil condenser microphones — the format that captures drum overheads, acoustic guitar stereo, choir, orchestra, and piano with the tightest cardioid pattern of any condenser microphone class. What separates the SP-1 pair from every other matched pair on the market is the included Hemisphere Mic Collection plug-in: a UA-developed software emulation that transforms the SP-1's sound into five iconic AKG and Neumann pencil condensers — the SD-54, SD-56, SD-84, SD-86, and SD-451 — in real time. The matched pair is the hardware, Hemisphere is the variable sound.

Hemisphere Mic Collection: Five Legendary Small-Diaphragm Condensers

The Hemisphere plug-in ships with the SP-1 pair and models five small-diaphragm condensers that defined the sound of pro recording for the last 60 years. The SD-54 captures the thin-nickel-diaphragm clarity used on Larry Carlton, Ry Cooder, Yo Yo Ma, and Eric Clapton sessions. The SD-56 captures the silky AC701-tube top-end used on grand piano and vocal recording. The SD-84 captures the modern cardioid detail used by Anderson Paak, Mac DeMarco, and Johnny Marr. The SD-86 captures the back-to-back KM84-style crisp top end heard on countless Motown classics. The SD-451 captures the modular bright tone used on pianos, snare bottoms, and drum overheads across decades of pro records.

How Hemisphere Differs From an EQ Curve

Hemisphere is not an EQ preset — it is a modeled response across filter behavior, proximity effect, and axis sensitivity. That means the SD-54 model responds to off-axis sources the same way the original SD-54 does. The SD-86 model captures proximity effect the way the original SD-86 does. Setting up the pair in front of a source and switching between five modeled microphones in the DAW gives a working engineer five distinct microphone characters from a single pair of pencil condensers — without owning five separate pairs.

Hardware: 142 dB SPL, 20Hz-20kHz Cardioid Pencil Pair

The SP-1's hardware design is a small-diaphragm cardioid condenser pencil microphone at 5 in length and 23.5 mm diameter. The pencil form factor matters because it physically fits placements where a larger large-diaphragm condenser cannot — tight stereo configurations on drum overheads, 12th-fret acoustic guitar stereo capture, and overhead piano placement where a 2-inch-diameter mic body would interfere with the lid. The 142 dB maximum SPL handles loud sources without distortion, the 20Hz-20kHz frequency range delivers full-range capture, and the cardioid pattern provides off-axis rejection for tight stereo imaging.

Matched-Pair Calibration for Phase-Coherent Stereo

The SP-1 pair is factory-matched for identical sensitivity. The matching matters in stereo capture: a pair of small-diaphragm condensers that differ by 1 dB in sensitivity creates a phase asymmetry that the listener hears as a stereo image that pulls to one side. The SP-1's factory matching eliminates that — the stereo image is centered and symmetric across drum overheads, choir, and acoustic guitar applications.

The Full Stereo Recording Rig Ships in the Box

The SP-1 retail box ships with the two matched microphones, two mic stand mounts, a stereo T-bar that holds the pair on a single microphone stand, two foam windscreens, and two 5/8 in to 3/8 in thread adapters. Every accessory needed for stereo recording from one stand is included — no separate stereo bar purchase, no separate windscreen purchase, no separate adapter purchase. Plus the Hemisphere plug-in license activates on product registration for use with or without UA Apollo or Volt hardware.

Use Cases: Drum Overheads, Acoustic Guitar, Piano, Choir, Field Recording

The SP-1 pair's most common application is drum overhead stereo recording in XY or ORTF configuration on the included T-bar. Other common uses: acoustic guitar stereo capture at the 12th fret with XY positioning, piano stereo overhead recording with the pair directly above the strings, choir and orchestra stereo recording from one stand position, brass section close-mic for big band and brass ensemble recording, live performance stereo capture for streaming and recording, and field recording for music, nature, and documentary applications.

Who This Microphone Pair Is For

Working recording engineers tracking drum overheads who want five microphone characters from a single matched pair. Home studio producers recording acoustic guitar in stereo who need the pencil form factor to fit tight 12th-fret placements. Live broadcast and streaming engineers capturing piano, choir, and ensemble performances. Songwriters and demo studios who want professional-grade stereo capture without buying multiple matched pairs at multiple price tiers. Field recordists capturing location dialogue, music performance, and nature ambience with one pair that emulates five.