Microphone Globe

How to Mic a Grand Piano with Two Condensers

Capturing the sound of a grand piano in stereo is one of the most rewarding challenges in music recording. A well-placed pair of condenser microphones can reveal the percussive hammer attack, the singing sustain of the strings, and the resonant bloom of the soundboard in a way that a single mono pickup simply cannot. Whether you are recording a solo recital at the Sydney Conservatorium, tracking a jazz trio in a Brunswick warehouse, or capturing student examinations for a music school in Perth, the principles of stereo piano miking remain remarkably consistent.

Before you start positioning stands, it pays to understand why two condensers are the preferred tool for this job. Condensers offer the transient response and high-frequency detail needed to preserve the piano's wide dynamic range, from the softest pianissimo to thunderous fortissimo passages. Their extended frequency response captures the full harmonic spectrum of the strings and the wooden body, while their typically lower self-noise ensures that quiet passages remain clean. For a broader look at how condensers suit different recording tasks, the resources at Microphone Globe offer useful background reading. This two-mic approach also gives you flexibility in the mix, since you can adjust the stereo width and tonal balance after the performance.

Choosing the right condenser pair

Selecting two microphones for piano recording involves balancing several characteristics. Small-diaphragm condensers are often favoured for classical and acoustic music because of their fast transient response and consistent off-axis behaviour. Large-diaphragm condensers add warmth and a fuller low end, which can flatter pop, jazz, and singer-songwriter material. Many engineers in Australian studios keep a matched pair of small-diaphragm condensers for piano work, as matched pairs guarantee that both capsules have nearly identical frequency response and sensitivity.

Polar pattern is the next consideration. Cardioid patterns reject some of the room behind the piano, which helps when recording in less-than-perfect spaces such as converted warehouses in Collingwood or suburban home studios. Omnidirectional patterns capture more of the natural ambience and the low-frequency weight of the soundboard, but they also pick up every reflection from the walls. If you are unsure which pattern suits your room, the matching polar patterns to room acoustics guide explains the trade-offs in detail.

It is also worth considering self-noise and maximum SPL handling. Grand pianos can produce peaks well above 120 dB when played vigorously, so microphones with high SPL ratings and built-in pads are useful. Australian-made brands such as Rode have made matched pairs of small-diaphragm condensers widely available through local retailers, often at competitive prices in AUD compared to imported European alternatives. Check the warranty terms and after-sales support available locally before purchasing.

Stereo techniques for grand piano

Several time-tested stereo miking techniques work beautifully on grand piano, each offering a different spatial character. The coincident XY configuration places the two capsules as close together as possible, angled at roughly 90 to 120 degrees. Because the sound arrives at both capsules at almost the same time, XY delivers excellent mono compatibility and a focused centre image. It works particularly well in dry rooms or when you want a tight, present sound that sits forward in a mix.

The near-coincident ORTF and NOS techniques spread the capsules slightly wider than XY, typically 17 centimetres apart at 110 degrees for ORTF, or 30 centimetres at 90 degrees for NOS. These approaches produce a wider stereo image with greater sense of depth, making them popular for classical recordings where the piano's acoustic space matters. They remain reasonably mono-compatible, though careful attention to phase is required.

The spaced pair, or AB technique, places the two microphones several centimetres to a metre apart, often parallel to each other across the width of the piano. This produces the widest stereo image and captures the full physical span of the instrument, but it sacrifices some mono compatibility. For solo piano recordings intended for stereo release on platforms like ABC Classic, a spaced pair can sound breathtakingly natural. For tracks that will be summed to mono for broadcast or streaming compression, a coincident or near-coincident technique is usually safer.

Positioning and angle

The physical placement of the microphones relative to the piano dramatically shapes the recorded sound. A common starting point is to position the pair roughly above the strings, with the lid either fully open, on the short stick, or fully closed depending on the desired brightness and isolation. For an open, resonant sound, leave the lid on the full stick and place the microphones about 30 to 50 centimetres above the strings, centred over the middle of the soundboard where the bass and treble strings meet.

Moving the microphones closer to the hammers increases the percussive attack and the string noise, which can be flattering for percussive contemporary pieces but harsh for lyrical classical repertoire. Pulling them back towards the tail of the piano emphasises the low-frequency body and the room ambience. Engineers in Adelaide and Brisbane studios often find that a height of around 60 to 80 centimetres strikes a good balance between clarity and fullness.

Angle the capsules towards the centre of the soundboard rather than directly at the hammers. This reduces the harshness of the attack while retaining the body of the instrument. If you are using a coincident technique, aim each capsule at opposite sides of the piano. For spaced pair configurations, angle them slightly inward to maintain a focused centre image. Always use sturdy microphone stands, as grand pianos transmit vibrations through the floor that can rumble into lightweight stands.

Gain staging and signal flow

Once the microphones are positioned, setting clean gain levels protects the recording from distortion and noise. Start with the preamp gain at a low setting, then gradually increase while the pianist plays the loudest passage in the piece. Condensers require 48-volt phantom power, so engage it before raising the gain. If your microphones have a pad switch, engage it for very loud playing or close placement to prevent the capsules from overloading.

Use a high-quality audio interface with clean preamps. Australian studios often favour interfaces with generous headroom, such as those offering 60 dB or more of gain, to accommodate the wide dynamic range of a grand piano. Record at 24-bit depth to capture the full dynamic nuance, and choose a sample rate of 48 kHz or higher for video work or 96 kHz for archival classical recording. Make sure to monitor on closed-back headphones while setting levels, as the live piano sound can mask clipping in the headphones.

If the room is noisy or prone to rumble, engage a high-pass filter on each microphone channel at around 60 to 80 Hz to reduce low-end mud and mechanical noise from the pedals and floor. Save a test recording before the actual session, listen back through the monitors, and adjust the microphone positions or levels as needed. A few minutes of preparation can save hours of frustration during editing.

Solving common stereo miking problems

Even with careful planning, stereo piano recording presents recurring challenges. Phase cancellation is the most common issue, especially when using spaced pair techniques or when combining the stereo track with close mics. Always check your recording in mono by summing the two channels on your interface or DAW. If the low end disappears or the sound becomes hollow, the microphones are out of phase. Small adjustments to position, usually measured in centimetres, can restore proper phase coherence.

Room acoustics also play a major role. Hard, reflective surfaces such as bare brick walls, tiled floors, and large windows create flutter echoes and comb filtering that can ruin an otherwise beautiful performance. In Australian homes, where open-plan living areas with polished concrete or timber floors are common, these reflections can be particularly aggressive. Hanging thick curtains, laying rugs, or temporarily closing the piano lid can tame the worst offenders.

Humidity and temperature affect both the piano and the microphones. Coastal cities like Sydney and Cairns experience high humidity that can swell piano action and dull the tone, while dry inland climates like Canberra in winter can cause the soundboard to crack or the tuning to drift. Allow the piano to acclimatise to the recording space for several hours before tracking, and keep microphones in their cases until needed to prevent moisture damage. Always check the manufacturer's recommended operating conditions, especially if you are using vintage tube condensers that are sensitive to temperature swings.

Quick recording checklist

A few practical habits make every piano session run smoothly:

  • Confirm 48V phantom power is engaged before connecting or disconnecting condenser microphones.
  • Record a short test passage and check the stereo image in both stereo and mono before committing to the full performance.
  • Use shock mounts to isolate the microphones from vibrations transmitted through the piano body and the floor.
  • Keep a spare set of XLR cables and a multi-tool on hand, as Australian studios occasionally stock unfamiliar connector types for older European gear.
  • Document the microphone positions with a quick photo so you can recreate the setup for follow-up sessions or overdubs.

Following these guidelines will help you capture the full emotional range of a grand piano, from delicate pianissimo to thunderous fortissimo, with a sense of space and realism that honours both the instrument and the performer.