spectrum eye RTA 1.3.3

For music professionals, audio engineers, sound technicians, sound system installers, and audio students.

Equally useful for quick reference and long-term live spectra display. It supports multiple FFT sizes, adjustable averaging time and bandwidth, selectable mic input, and selectable plot color.

Main features:

• Wide range of frequency resolutions & averaging times
• Scalable & movable plot with smooth animation
• Utilizes the full audio range even with the built-in mic
• Selectable input source/mic or external device

With Spectrum-Eye, you can:

• Monitor sound quality at concerts
• Ring out feedback in stage monitors
• Identify resonances in acoustic environments
• Evaluate spectral properties of audio material in the studio
• Enhance your hearing skills through frequency-aware hearing practice
• Detect problematic frequencies in speech/music
• Tune up car sound systems

Supports external microphones & audio interfaces compatible with your iPad or iPhone. Currently uses the sum of input channels 1 & 2.

Allows selecting a preferred iPad mic when no external audio input is connected. You can discover how many mics and mic directivity configurations your device has.

Utilizes the iOS "Audio measurement mode" to bypass built-in mic processing. This setting can be switched on/off for comparison.

Nominal sampling rate, Hz: 48000
Measurement frequency range, Hz: 8...22000
Measurement magnitude range, dB: 144dB
Magnitude precision, dB: ±0.2
Frequency resolution (bandwidth):
- 1 octave
- 1/3
- 1/6
- 1/12
- 1/24
- 1/48
- 1/96 (iPad only)

The app also includes a pink noise generator for use with external audio interfaces. You can utilize the app as a pink noise generator even when the screen is off.

Basic usage tips:

• Reposition the plot by sliding on scales (frequency scale for horizontal movement, dB scale for vertical)
• Scale the plot horizontally or vertically using a two-finger pinch
• Slide your finger over the plot to move the cursor and view its position in Hz and dB

You can find additional tweaks and fine-tunings in Settings, accessible using the three-dot button on the top left.

The app is actively developing; your suggestions are welcome!