# RRS EQ173 — Mic/line Amp with EQ

> Vintage mic/line amplifier and EQ audio plugin with AUv3 support. (iPhone/iPad app by RRS, OOO.)

- Source: https://appshunter.io/ios/app/rrs-eq173/id1636444874 (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: 4.90/5 from 22 App Store ratings · 7 written reviews indexed
- Age rating: 4+
- Requires: iOS 10.0 · 16 MB
- Languages: American English
- Released: 2022-07-28
- Data updated: 2026-08-20
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/rrs-eq173/id1636444874/reviews.md

## What is RRS EQ173?

EQ173 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 EQ173 AUv3 plug-in as many times as you want, thereby you get the Demo period again and again.) Unlimited version of EQ173 AUv3 plug-in comes as In-App Purchase.

Red Rock Sound EQ173 is based on introduced in 1970, this hallowed class-A, transistor mic/line amp with EQ epitomizes the beautiful sound, with unparalleled clarity, sheen and bite.

Features:

• Standalone and AUv3 plug-in;
• Modeled vintage EQ;
• Stereo (Mono), Mid or Side EQ modes;
• Undo/Redo;
• A/B comparison;
• 2x/4x/8x Upsampling;
• Macro controllers;
• Built-in Gain Match;
• Scalable GUI.

PREAMP SECTION:

• Line Gain — Line drive is increased as the knob is rotated counter-clockwise. Range: -20 to +10;
• Mic Gain — To increase the mic drive, rotate the knob clockwise. Range: -20 to -80. PreAmp will not increase gain, just harmonic distortion. The distortion is mild and adds some coloration.

EQ SECTION:

• High Band — The High Shelf knob offers approximately ±15 dB of smooth fixed frequency shelving equalization at 12 kHz. Rotate the control clockwise to add the famous high-end sheen, or counter-clockwise to reduce the treble response;
• Midrange Band— The midrange band is controlled by two knobs, delivering smooth semi-parametric midrange equalization. The right knob controls the band gain, and the left knob selects the band frequency or band disable. The response for this band has a dependence on the bandwidth as the gain is adjusted. At higher center frequencies, the Q goes up for a more focused peak;
• Low Band — The low band delivers smooth low frequency shelving equalization, controlled by two knobs. The right knob controls the band gain, and the left knob selects the shelf frequency or band disable. The available range is approximately ±15 dB. The band gain is zero when the knob position indicator is pointing straight down;
• Low Cut — This knob specifies the fixed frequency of the low cut (high pass) filter. This filter has an 18 dB per octave slope. The available frequencies are 50 Hz, 80 Hz, 160 Hz, 300 Hz and OFF.

MASTER SECTION:

• Input — Input adjusts the signal level at the input of the plug-in without effecting the sonic character of the signal. The available range is ±24 dB;
• Phase — The PHASE button inverts the polarity of the signal. When the switch is engaged, the phase is inverted. Leave the switch in the disengaged for normal phase;
• EQ — The equalizer is engaged when the EQ switch is engaged. To disable the EQ, disengage the switch. In the EQ173 the audio is still colored even when the EQ switch is disengaged and the EQ settings are in their «flat» positions. This is due to the fact that the signal is still passing through PreAmp circuitry;
• Output — Output adjusts the signal level at the output of the plug-in without effecting the sonic character of the signal. The available range is ±24 dB.

To use EQ173 as a plug-in, you need an AUv3-compatible host app like GarageBand, Auria, AUM, Cubasis and more — EQ173 will appear in the list of Audio Unit extensions for effect plug-ins in the host app.

## Key features

- Standalone and AUv3 plugin
- Modeled vintage EQ
- Stereo, Mid, or Side EQ modes
- Undo/Redo functionality
- A/B comparison
- Scalable GUI

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| RRS EQ173 Unlimited | $4.99 | one-time |


## Recent user reviews (7 of 7)

All indexed reviews: https://appshunter.io/ios/app/rrs-eq173/id1636444874/reviews.md

### 5/5 — Saturation!

*2026-01-14*

Love this plugin so much I’ll probably buy the vst

### 5/5 — Great for Vocals

*2023-10-02*

This EQ173 provides a top tier boost to any vocal chain. It’s quickly become a go to for me! Much love RRS 🙌🏾

### 5/5 — Sheer Class on its own.

*2023-08-01*

Edited: this is the first and the finest emulated Neve Eq with Preamp, those who knows , they know, how it transforms the game of production!

I just wanted to the developers to know that, these apps they’ve created for the ipad platform, are just effin awesome. The noobs or the people halfheartedly casually doing production wont have the slightest clue what these plugins can do to your sound arrangement, it adds divinity to the sound. Please keep up the spirit, thank you so much for these AU units. Only the professionals knows what jems are these EQs and compressors. Eternally grateful. I ran out of credits, or else I was gonna buy each and every one of their apps. I’ve never come across such apps having hardware class standard. Sometimes its better, completely my own opinion, one, might disagree, and I respecy that. Thank you once again devs. May the lord bless you and your family . Regards.

### 5/5 — Plugins sound excellent

*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!

### 4/5 — Very Nice

*2022-12-27*

Mic gain does seem to excite/saturate the signal very subtlety and in a musical way. Eq sounds nicely analogue and a little squashed in a good way. Four stars for one reason. Mid/Side. Would be nice if the developer gave separate adjustments for both mid and side. Looks like two instances would be needed to do full mid side eq adjustment as you can only have one or the other. Perhaps that’s greedy. 

Worth every penny

### 5/5 — So many great apps from this dev!

*2022-10-14*

Sound great, easy to use, get them all!

### 5/5 — Sheer Class on its own.

*2022-08-17, version 1.0.0*

I just wanted to the developers to know that, these apps they’ve created for the ipad platform, are just effin awesome. The noobs or the people halfheartedly casually doing production wont have the slightest clue what these plugins can do to your sound arrangement, it adds divinity to the sound. Please keep up the spirit, thank you so much for these AU units. 

Only the professionals knows what jems are these EQs and compressors. 

Eternally grateful. I ran out of credits, or else I was gonna buy each and every one of their apps. 

I’ve never come across such apps having hardware class standard. Sometimes its better, completely my own opinion, one, might disagree, and I respecy that. 

Thank you once again devs. May the lord bless you and your family . Regards.

## Frequently asked questions about RRS EQ173

### How long can I use RRS EQ173 for free?

RRS EQ173 offers a time-limited demo version with 5 minutes of free play time. You can reload the plugin to restart the demo period as many times as you wish.

### How do I get unlimited access to RRS EQ173?

Unlimited access to RRS EQ173 is available as an In-App Purchase. This unlocks the full functionality of the plugin without any time restrictions.

### What audio formats does RRS EQ173 support?

RRS EQ173 functions as a Standalone application and an AUv3 plugin, making it compatible with a wide range of iOS audio applications that support the AUv3 format.

### Can RRS EQ173 be used on multiple devices?

Yes, RRS EQ173 is supported on iPhone, iPad, and iPod. The AUv3 format ensures compatibility across these Apple devices.

### What is the age rating for RRS EQ173?

RRS EQ173 has an age rating of 4+. This indicates it is suitable for users of all ages, with no mature content.

### How often is RRS EQ173 updated?

The latest version of RRS EQ173 is 2.0.3, last updated on December 29, 2025. While this indicates a recent update, specific update frequency is not detailed.

### What makes the RRS EQ173 sound unique?

RRS EQ173 is based on a 1970s class-A transistor mic/line amp, aiming to replicate its unparalleled clarity, sheen, and bite. The preamp section adds mild harmonic distortion for coloration.

### Does RRS EQ173 have ads?

No, RRS EQ173 does not contain advertisements. Its monetization is solely through an in-app purchase for the unlimited version.

## Version history (last 5 releases)

### 2.0.3 — 2025-12-29

- Fixed parameters Automation bug.

If you like EQ173 plug-in, please support us by rating this app in the App Store!

### 2.0.2 — 2025-12-27

- Fixed inconsistent Routings switching bug.

If you like EQ173 plug-in, please support us by rating this app in the App Store!

### 2.0.1 — 2025-11-28

- Fixed plug-in startup crash in legacy iOS.

### 2.0.0 — 2025-11-21

- 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.

### 1.5.0 — 2022-11-27

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

## Apps similar to RRS EQ173

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Blindfold EQ](https://appshunter.io/ios/app/blindfold-eq/id1664229692) | 4.8 (34) | Free | Music |
| [Pitch Drift - Baby Audio](https://appshunter.io/ios/app/pitch-drift-baby-audio/id1659406720) | 4.7 (32) | Free | Music |
| [Zen AutoPan](https://appshunter.io/ios/app/zen-autopan/id6478596185) | 4.6 (14) | Free | Music |
| [Fair Limiter](https://appshunter.io/ios/app/fair-limiter/id6503627515) | 4.7 (7) | Free | Music |
| [IHNY-2 - Baby Audio](https://appshunter.io/ios/app/ihny-2-baby-audio/id1639903928) | 4.9 (17) | Free | Music |
| [TB GonioMeter](https://appshunter.io/ios/app/tb-goniometer/id6444903624) | 4.6 (23) | Free | Music |

## 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

## Related topics

[auv3 plugin](https://appshunter.io/ios/topics/auv3-plugin)

---

*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.*