Question 1

How do I use RTA with pink noise to tune a PA system?

Accepted Answer

The basic procedure: connect a pink noise source to the system input (SonaVyx can generate it). Set the system to a moderate level. Place the measurement microphone at the primary listening position (mix position or center of audience). View the RTA display with 1/3 octave resolution. The display should be approximately flat (±3 dB) if the system has a neutral tonal balance. Identify bands that are significantly above or below the average. Apply corrective EQ: cut bands that are too high, gently boost bands that are too low. Recheck after each adjustment. Move the microphone to 3-4 additional positions and verify consistency. Avoid EQing narrow dips that appear only at one position. SonaVyx target curve overlay shows your desired response for direct comparison.

Question 2

What target response should I aim for when tuning with RTA?

Accepted Answer

The target depends on the application. Flat response (±3 dB, 50 Hz to 16 kHz): suitable for speech-primary systems, playback systems, and monitoring environments. Gentle house curve (+3 dB shelving boost below 200 Hz, -3 dB shelf above 8 kHz): preferred by many live sound engineers for musical warmth and reduced harshness. B&K house curve: a well-documented gently falling response, approximately -1 dB per octave above 1 kHz. X-curve (ISO 2969): for cinema playback, flat to 2 kHz then rolling off -3 dB per octave, designed to compensate for the high-frequency absorption of large audiences and room air. NC curve matching: for HVAC noise compliance, the target is the specified NC curve. SonaVyx includes 12 built-in target curves that you can overlay on the RTA display for direct comparison.

Question 3

How do I check system coverage uniformity with RTA?

Accepted Answer

Coverage uniformity measures how consistent the SPL and frequency response are across the audience area. Procedure: play pink noise at a fixed level. Measure the RTA at 6-12 positions spanning the audience (front/back, left/right, center/edges). Store each trace. Compare all traces overlaid. Good uniformity shows all traces within ±6 dB across the coverage area. The overall SPL should vary by less than 3-6 dB. Look for: frequency-dependent coverage gaps (high frequencies rolling off at the edges, indicating the speaker dispersion angle is too narrow), excessive bass at certain positions (room modes), and level drops under balconies or behind obstacles. SonaVyx trace store with color-coded overlays makes spatial comparison visual and intuitive.

Question 4

Should I tune the system with the room empty or full of people?

Accepted Answer

Ideally, tune with the room as close to show conditions as possible. An occupied room has significantly different acoustics than an empty one: people absorb mid and high frequencies, reducing RT60 and smoothing the response. The difference is most noticeable in rooms with hard seating (folding chairs, pews) because upholstered seats absorb almost as much as occupied seats. If you can only tune with the room empty, expect the high-frequency response to be 2-4 dB hotter during sound check than it will be during the show. Some engineers set the high-end slightly below target when tuning empty, knowing the audience absorption will bring it to target. SonaVyx before/after comparison can document the difference between empty and occupied responses if you measure both.

Question 5

How do I use RTA to balance multiple speaker zones?

Accepted Answer

Multi-zone systems (main speakers, delays, fills, subwoofers) need level-matched and time-aligned zones for uniform coverage. Procedure: set all zones to the same input signal (pink noise). Measure each zone individually at its primary coverage area. Adjust zone levels so that all zones produce the same SPL (within 2 dB) at their respective primary positions. Then measure at the overlap boundaries between zones: the combined SPL should be 3-6 dB above the individual zones (summation gain) without sharp dips (cancellation). Check the frequency response in overlap zones for comb filtering. If necessary, adjust time alignment to smooth the overlap response. SonaVyx multi-trace view lets you see each zone individually and the combined response in one display.

Question 6

What is the best microphone position for RTA system tuning?

Accepted Answer

The primary measurement position should be the most important listening position, typically the mix position for live sound or the primary seating area center for installed systems. Place the microphone on a stand at ear height (1.2 m seated, 1.5 m standing), at least 1 m from any surface. Avoid positions directly on the axis between parallel walls (flutter echo) or in corners (mode concentrations). For a thorough survey, measure at additional positions: 3 m left and right of center, halfway to the front, and halfway to the rear. The average of these positions gives a representative system response. Never make major EQ changes based on a single position measurement. SonaVyx lets you store traces from each position and shows the arithmetic average across positions.

Question 7

How quickly should the RTA respond for live monitoring?

Accepted Answer

For live show monitoring, the RTA should update fast enough to track musical dynamics but not so fast that it is distracting. Exponential averaging with a time constant of 0.5-1 second provides a smooth display that follows the general energy of the music without flickering on every transient. For system tuning with pink noise, faster response (125-250 ms) shows the instantaneous spectrum, useful for identifying transient problems. Peak hold with a 3-5 second reset captures the maximum levels, useful for monitoring peak SPL compliance. SonaVyx supports adjustable averaging speed and peak hold modes. The spectrograph view provides a scrolling time history that captures both fast changes and long-term trends.

Question 8

Can I use RTA to match the response of two different speaker models?

Accepted Answer

Yes, RTA is useful for matching speakers of different types used in the same system (e.g., main speakers from one manufacturer and delay speakers from another). Play the same pink noise through each speaker system individually and capture the RTA at the same position. Compare the two traces to identify frequency ranges where they differ. Apply EQ to one or both speakers to minimize the spectral difference in the crossover region where coverage overlaps. Focus on matching the 200 Hz to 8 kHz range, which is most critical for tonal continuity. Perfect matching is impossible because different speakers have different directivity patterns, but tonal matching at the overlap zone ensures that listeners do not hear a tonal shift when moving between coverage zones. SonaVyx trace overlay with difference display shows exactly where the responses diverge.

RTA System Tuning: Pink Noise, Target Curves, Coverage, and Zone Balancing

Frequently Asked Questions