# RRS EQP-1A — Classic Program Equalizer

> Classic program equalizer audio plugin with vintage hardware emulation. (iPhone/iPad app by RRS, OOO.)

- Source: https://appshunter.io/ios/app/rrs-eqp-1a/id1584482870 (this page in markdown: same URL + `.md`)
- Developer: [RRS, OOO](https://appshunter.io/developer/1486125568)
- Category: Music, Utilities
- Price: Free with in-app purchases
- Rating: 5.00/5 from 5 App Store ratings
- Age rating: 4+
- Requires: iOS 10.0 · 17 MB
- Languages: American English
- Released: 2021-09-08
- Data updated: 2026-07-07
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/rrs-eqp-1a/id1584482870/reviews.md

## What is RRS EQP?

The EQP-1A AUv3 plug-in — comes as time-limited Demo-version for you to try. It gives you 5 minutes of Free play time. (You can reload the EQP-1A AUv3 plug-in as many times as you want, thereby you get the Demo period again and again.) Unlimited version of EQP-1A AUv3 plug-in comes as In-App Purchase.

The EQP-1A based on Classic Program Equalizer from the '60s, original EQ is renowned for its unique ability to boost and cut the same frequencies simultaneously, thereby creating a resonant shelf, the EQP-1A faithfully models the overbuilt transformers and complex tube amplifiers of the original hardware.

SPECIFICATIONS:

• 20, 30, 60, 100 Hz shelf Boost;
• 20, 30, 60, 100 Hz shelf Attenuate;
• 3, 4, 5, 8, 10, 12, 16 kHz peak Boost;
• 5, 10, 20 kHz shelf Attenuate;
• On/Off Analog Saturation;
• Undo/Redo;
• A/B;
• 2x/4x/8x Upsampling;
• Macro controllers;
• Built-in Gain Match;
• Scalable GUI.

Conceived and created for broadband equalization, the EQP-1A features 4 low boost/cut frequencies, 3 high-cut frequencies and 7 HF boost points, along with a bandwidth control for shaping the high boost curve.

The broadband EQP-1A and the midrange MEQ-5 together comprise a full range vintage EQ chain.

To use EQP-1A as a plug-in, you need an AUv3-compatible host app like GarageBand, Auria, AUM, Cubasis and more — EQP-1A will appear in the list of Audio Unit extensions for effect plug-ins in the host app.

## Key features

- Classic program equalizer emulation
- Unique resonant shelf creation
- Vintage hardware modeling
- Multiple frequency boost/attenuate points
- Analog saturation
- Undo/Redo functionality
- Scalable GUI

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| RRS EQP-1A Unlimited | $4.99 | one-time |



## Frequently asked questions about RRS EQP

### What is RRS EQP-1A?

RRS EQP-1A is an AUv3 audio plugin that emulates a classic program equalizer from the 1960s. It is designed for broadband equalization and offers unique frequency shaping capabilities.

### How can I try RRS EQP-1A for free?

RRS EQP-1A comes as a time-limited demo version, offering 5 minutes of free play time. You can reload the plugin as many times as needed to access the demo period repeatedly.

### How do I unlock the full version of RRS EQP-1A?

The unlimited version of RRS EQP-1A is available as an In-App Purchase. This allows for continuous use without time restrictions.

### What kind of frequency controls does RRS EQP-1A offer?

RRS EQP-1A provides multiple frequency options for both shelf boost/attenuate at low frequencies (20-100 Hz) and peak boost at high frequencies (3-16 kHz), along with shelf attenuation at high frequencies (5-20 kHz).

### Does RRS EQP-1A have analog saturation?

Yes, RRS EQP-1A features an On/Off Analog Saturation option. This allows users to add characteristic warmth and character to their audio.

### What devices is RRS EQP-1A compatible with?

RRS EQP-1A is compatible with iPhone, iPad, and iPod. It requires an AUv3-compatible host app to function as a plugin.

### How often is RRS EQP-1A updated?

The latest version, 4.0.2, was last updated on December 29, 2025. This indicates a recent update, suggesting ongoing development and support.

### What is the user rating for RRS EQP-1A?

RRS EQP-1A has an excellent rating of 5.0 stars from 5 ratings. This suggests a very high level of user satisfaction with the plugin.

## Version history (last 5 releases)

### 4.0.2 — 2025-12-29

- Fixed parameters Automation bug.

If you like EQP-1A plug-in, please support us by rating this app in the App Store!

### 4.0.1 — 2025-12-27

- Fixed inconsistent Routings switching bug.

If you like EQP-1A plug-in, please support us by rating this app in the App Store!

### 4.0.0 — 2025-12-03

- Implemented Gain Matching (GM) feature;
- Implemented Macro-Controllers feature;
- Implemented serial Groups chain feature;
- Implemented User Presets feature;
- Implemented SIMD optimization (experimental);
- Minor bug fixes and improvements.

### 3.0.0 — 2022-11-14

- Implemented GUI Scale on Pinch feature;
- Implemented HQ-mode;
- Implemented Presets Drop-down Menu;
- Fixed parameters tweaking crash bug in some DAWs.

### 2.0.0 — 2021-11-20

- Implemented redesigned Toolbar;
- Implemented Undo/Redo functionality;
- Implemented A/B functionality;
- Implemented 2x/4x/8x-oversampling feature;
- Optimized GUI memory consumption;
- Minor bug fixes and improvements.

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## More apps by RRS, OOO

- [EQ560](https://appshunter.io/ios/app/eq560/id1486125569)
- [EQ-A](https://appshunter.io/ios/app/eq-a/id1492043981)
- [EQ550](https://appshunter.io/ios/app/eq550/id1507132030)
- [EQ550b](https://appshunter.io/ios/app/eq550b/id1507176549)
- [PolyIvoks Filter](https://appshunter.io/ios/app/polyivoks-filter/id1507649629)
- [RRS EQ3](https://appshunter.io/ios/app/rrs-eq3/id1507895144)

All apps by RRS, OOO: https://appshunter.io/developer/1486125568

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-07.*