# DriveRack PA2 Control vs Audio Spectrum Analyzer Pro

The clearest difference is rating: Audio Spectrum Analyzer Pro at 4.4 against DriveRack PA2 Control's 3.2. Audio Spectrum Analyzer Pro also leads on review sentiment (57% vs 34%). DriveRack PA2 Control's advantage is in-app purchases (none vs 2). On price, ratings volume, update cadence and ads there is nothing between them.

Both are free to download. Audio Spectrum Analyzer Pro sells 2 in-app purchases, starting at $19.99 per year. DriveRack PA2 Control asks for nothing beyond the download.

Audio Spectrum Analyzer Pro holds the better App Store score, 4.4 against 3.2. Both are backed by a comparable volume of ratings — 108 and 238 respectively. Written reviews point the same way: 34% of DriveRack PA2 Control's written reviews are positive against 57% of Audio Spectrum Analyzer Pro's.

DriveRack PA2 Control ships an update every 8 months, Audio Spectrum Analyzer Pro every 7 months. The most recent releases landed on September 20, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | DriveRack PA2 Control | Audio Spectrum Analyzer Pro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.2 (108 ratings)](https://appshunter.io/ios/app/driverack-pa2-control/id817149833/reviews) | **[4.4 (238 ratings)](https://appshunter.io/ios/app/audio-spectrum-analyzer-pro/id1152352806/reviews)** |
| Number of ratings | 108 | **238** |
| Positive reviews | 34.0% of reviews | **57.4% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 7 months** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 67 MB | 40 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | +4 | 4+ |
| Developer | [Harman Professional, Inc.](https://appshunter.io/developer/410104207) | [Vlad Polyanskiy](https://appshunter.io/developer/438646985) |

## What reviewers say

### DriveRack PA2 Control

[App page](https://appshunter.io/ios/app/driverack-pa2-control/id817149833)

Control your PA2 hardware wirelessly from any location. This app optimizes and protects your loudspeakers by managing audio processing between your mixer and amplifiers.

**Highlights:** Wireless control via WiFi, System setup from any location, Loudspeaker optimization, Loudspeaker protection, Audio processing management

**In-app purchases:** none


### Audio Spectrum Analyzer Pro

[App page](https://appshunter.io/ios/app/audio-spectrum-analyzer-pro/id1152352806)

Analyze sound frequencies in real-time with this powerful tool. It offers detailed octave band analysis, FFT plots, and various measurement scales. Supports multiple microphones and noise analysis features for accurate audio insights.

**Highlights:** Octave Band Real Time Analyzer, FFT Plot (Fast Fourier Transform), Sound level meter (dB meter), Noise Rating and Noise Criterion support, Support for external microphones, Pre-calibrated mic profiles

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Mode | $19.99 | per year |
| Premium Pack | $29.99 | one-time |

**What reviewers like**

- 👍 Intuitive and easy-to-use interface
- 💰 Completely free with no ads
- 🎯 Accurate frequency and spectrum analysis
- 📊 Multiple visualization modes (FFT, spectrograph, bar display)
- 🔧 Professional-grade audio measurement tool

**What reviewers complain about**

- 💸 Aggressive subscription/paywall nags
- 🔄 Frequent iOS compatibility issues after updates
- 📉 Features moved behind paywall in recent updates
- 🐛 App crashes on startup (especially iOS 16/26)
- ⚠️ Misleading free trial that requires payment

**Reported bugs**

- App crashes on iOS 16 and iOS 26 launches
- FFT resolution not working after iOS updates
- Graph display freezes or becomes unresponsive
- Spectrograph mode too slow on newer iPhones
- Frequency alignment issues with dynamic display

**Requested features**

- Audio file upload capability
- White noise/test signal generator
- Microphone calibration file support
- Recording functionality with timestamp
- Multiple frequency cursors for comparison


## Frequently asked questions

### Is DriveRack PA2 Control free?

DriveRack PA2 Control is free to download, with no in-app purchases.

### Is Audio Spectrum Analyzer Pro free?

Audio Spectrum Analyzer Pro is free to download, with in-app purchases available.

### Which has better reviews, DriveRack PA2 Control or Audio Spectrum Analyzer Pro?

Audio Spectrum Analyzer Pro is rated higher. DriveRack PA2 Control averages 3.2 out of 5 from 108 ratings, while Audio Spectrum Analyzer Pro averages 4.4 from 238 ratings.

### Do DriveRack PA2 Control or Audio Spectrum Analyzer Pro have ads?

Neither DriveRack PA2 Control nor Audio Spectrum Analyzer Pro shows ads.

### Which is updated more often, DriveRack PA2 Control or Audio Spectrum Analyzer Pro?

DriveRack PA2 Control ships an update every 8 months, and Audio Spectrum Analyzer Pro every 7 months. Most recently, DriveRack PA2 Control was updated on September 20, 2026 and Audio Spectrum Analyzer Pro on September 24, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*