# RRS Passive EQ Collection — Two Classic Passive EQs in One

> Vintage-style equalizer plugin combining EQP-1A, MEQ-5, and HLF-3C models. (iPhone/iPad app by RRS, OOO.)

- Source: https://appshunter.io/ios/app/rrs-passive-eq-collection/id1584945520 (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 14 App Store ratings · 3 written reviews indexed
- Age rating: 4+
- Requires: iOS 10.0 · 22 MB
- Languages: American English
- Released: 2021-09-08
- Data updated: 2026-08-20
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/rrs-passive-eq-collection/id1584945520/reviews.md

## What is RRS Passive EQ Collection?

The Passive EQ Collection 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 Passive EQ Collection AUv3 plug-in as many times as you want, thereby you get the Demo period again and again.) Unlimited version of Passive EQ Collection AUv3 plug-in comes as In-App Purchase.

SPECIFICATIONS:

• Three classics, EQP-1A, MEQ-5 and HLF-3C, combined in one full-featured equalizer;
• Standalone and AUv3 Plug-in;
• Modeled vintage Equalizers;
• On/Off Analog Saturation;
• Undo/Redo;
• A/B;
• 2x/4x/8x Upsampling;
• Macro controllers;
• Built-in Gain Match;
• Scalable GUI.

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.

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 MEQ-5 based on Classic Mid-Range Equalizer from the '70s, with two bands of midrange boost and one band of midrange dip, the MEQ-5 gets the very best out of the «power region» where guitars and vocals can make or break a mix.

The MEQ-5 provides exacting control of the «power region» in program material, that frequency range from about 300 Hz to 5000 Hz in which most of the sound energy is concentrated. The ear is especially sensitive to sounds in this region. In this region, even small resonances in studio acoustics and microphone and speaker responses are very evident in their effect on the listenability of the sound. Three independent sets of controls make it possible to boost on a peak curve at 200…1000 Hz while simultaneously boosting on a peak curve at 1.5…5 kHz, while simultaneously dipping at 200…7000 Hz.

The original HLF-3C hardware unit is a true passive design: there are no input/output amplifiers and it does not require any external power. As a result, there is an inherent loss of signal level when using the HLF-3C hardware. The RRS HLF-3C compensates for this inherent signal loss for simplified use in the modern era: it has unity gain upon insertion (there is no insertion loss until one or both of the cut filters is engaged).

The broadband EQP-1A, the midrange MEQ-5 and the passive high/low filter HLF-3C together comprise a full range vintage EQ chain.

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

## Key features

- Combines EQP-1A, MEQ-5, and HLF-3C equalizers
- Standalone and AUv3 plugin support
- Modeled vintage analog saturation
- Undo/Redo functionality
- A/B comparison
- Macro controllers
- Built-in Gain Match

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| RRS Passive EQ Collection Full | $8.99 | one-time |


## Recent user reviews (3 of 3)

All indexed reviews: https://appshunter.io/ios/app/rrs-passive-eq-collection/id1584945520/reviews.md

### 5/5 — 3D Sound!!!

*2023-01-06*

Don’t really know why this plugin company isn’t more popular than it is. The plugins sound excellent! I’m using them in GarageBand iOS. I bought several and do not regret it at all. They are true to the hardware they are emulating, and they have a very 3D/expensive quality to them in terms of sound. 5 stars!

### 5/5 — Top shelf top notch app

*2022-10-20*

I’m a true analog fanatic - through and through- my FX Chains are not complete without a Pultec Compressor and that goes especially for summing drums. These are worth every penny. I have the EQP1-A, MEQ-5, and the collection which combines the two previously mentioned plugins. Would love to see more of the classic analog boxes added to the RRS Lineup. 🙏🏿🤞🏿🙌🏿🦾

### 5/5 — Top quality - UPDATE!

*2022-10-14*

RRS apps are great! What a great line of apps they have!

## Frequently asked questions about RRS Passive EQ Collection

### What is RRS Passive EQ Collection?

RRS Passive EQ Collection is an audio plugin that emulates three classic vintage equalizers: EQP-1A, MEQ-5, and HLF-3C. It can be used as a standalone app or as an AUv3 plugin within compatible host applications.

### How does the RRS Passive EQ Collection demo work?

The demo version of RRS Passive EQ Collection offers 5 minutes of free playtime. You can repeatedly reload the plugin to access the demo period again, allowing you to try its features before purchasing the unlimited version.

### What vintage EQs are included in RRS Passive EQ Collection?

The collection includes models based on the 1960s EQP-1A, the 1970s MEQ-5, and the HLF-3C passive high/low filter. Each aims to faithfully replicate the sound and characteristics of its original hardware counterpart.

### Can I use RRS Passive EQ Collection with other music apps?

Yes, RRS Passive EQ Collection supports AUv3 plugin format, allowing it to be used within compatible host apps like GarageBand, Auria, AUM, and Cubasis on iOS devices.

### Does RRS Passive EQ Collection have ads?

No, RRS Passive EQ Collection does not contain advertisements. The app is free to download and use with a demo period, with the full functionality available via an in-app purchase.

### What is the price of the unlimited version of RRS Passive EQ Collection?

The unlimited version of RRS Passive EQ Collection is available as an in-app purchase. The specific price is not listed in the provided data, but it unlocks full functionality beyond the demo period.

### How often is RRS Passive EQ Collection updated?

The latest version, 4.0.2, was released on December 29, 2025. This indicates a recent update, suggesting the developer is actively maintaining and improving the application.

### What devices are compatible with RRS Passive EQ Collection?

RRS Passive EQ Collection is compatible with iPhone, iPad, and iPod. It is rated for ages 4 and up, making it accessible for a wide range of users.

## Version history (last 5 releases)

### 4.0.2 — 2025-12-29

- Fixed parameters Automation bug.

If you like Passive EQ Collection plug-in, please support us by rating this app in the App Store!

### 4.0.1 — 2025-12-26

- Fixed inconsistent Routings switching bug.

If you like Passive EQ Collection 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 HLF-3C module;
- 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 2026-08-20.*