# ERS_250 — EMT 250 reverb plugin by DDMF

> Faithful digital replica of the EMT 250 hardware reverb audio plugin. (iPhone/iPad app by Christian Siedschlag.)

- Source: https://appshunter.io/ios/app/ers-250/id1584339422 (this page in markdown: same URL + `.md`)
- Developer: [Christian Siedschlag](https://appshunter.io/developer/538434682)
- Category: Music, Productivity
- Price: $13.99
- Rating: 4.30/5 from 6 App Store ratings · 3 written reviews indexed
- Age rating: 4+
- Requires: iOS 9.3 · 9 MB
- Released: 2021-09-03
- Data updated: 2026-08-25
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/ers-250/id1584339422/reviews.md

## What is ERS_250?

The ERS 250 reverb audio plugin was originally designed and sold by Harrie Munnik and his Dutch company EmptyRoomSystems. DDMF, having been a part in the development of the first version some years ago, is proud to carry on the legacy by distributing and further developing the set of ERS plugins. This unit is a faithful replication of the first digital hardware reverb ever made, the EMT 250. Only 250 units of that legendary studio tool have ever been produced… needless to say, the availability as an audio plugin has received an enthusiastic welcome by the audio engineering and production community. Now this plugin is finally available for compatible iOS hosts that support either AUv3 or InterAppAudio.

Features:

- Careful reproduction of the original schematics
- Adjustable reverb decay time (from 0.4 to 5 seconds), low frequency response, high frequency response, and predelay
- Additional low-pass filter to create darker sounds
- Dry-Wet ratio adjustable
- Alternative “modern” schematics available

## Key features

- Replication of original EMT 250 schematics
- Adjustable reverb decay time (0.4-5s)
- Adjustable low and high frequency response
- Adjustable predelay
- Additional low-pass filter
- Adjustable Dry-Wet ratio
- Optional 'modern' schematics

## Recent user reviews (3 of 3)

All indexed reviews: https://appshunter.io/ios/app/ers-250/id1584339422/reviews.md

### 5/5 — Awesome

*2024-05-07*

Classic reverb sound, & bugs have been fixed

### 4/5 — Sounds great needs updates to fix issues

*2022-06-22*

i want to love this but the auv3 becomes unresponsive when trying to adjust the upsampling.

### 5/5 — I’m sure this will get fixed over time, hopefully soon.

*2021-09-22*

I am having crashes and freezes (on the AU, no the iPad) on AUM and ApeMatrix. 

Also some weird audio glitches (pops) before it “crashes”.  I think this little guy is the culprit as the other two from the just released bundle seem fine, but this one has given me issues the 2 out of 2 times I’ve used it since I purchased the bundle. 

Looking forward to a fix and nice plugs as always !!! 🙏🏼

## Frequently asked questions about ERS_250

### What is ERS_250?

ERS_250 is an audio plugin that faithfully replicates the EMT 250, the first digital hardware reverb ever created. It is available for compatible iOS hosts that support AUv3 or InterAppAudio.

### How much does ERS_250 cost?

ERS_250 is a paid application, priced at $13.99. It does not feature in-app purchases or advertisements.

### What devices is ERS_250 compatible with?

ERS_250 is compatible with iPhone, iPad, and iPod touch devices. It requires iOS 4+ and is optimized for newer devices.

### Does ERS_250 have ads?

No, ERS_250 does not contain advertisements. It is a premium audio plugin purchased upfront.

### How often is ERS_250 updated?

The latest version, 2.3.6, was released on January 3, 2026. Updates typically focus on compatibility and feature enhancements for the audio plugin.

### What are the key adjustable parameters in ERS_250?

ERS_250 allows for adjustable reverb decay time (0.4 to 5 seconds), low and high frequency response, predelay, and dry-wet ratio. It also includes an additional low-pass filter.

### Can I get a trial for ERS_250?

The provided data does not mention a trial period for ERS_250. It is available for purchase at $13.99.

### What is the age rating for ERS_250?

ERS_250 has an age rating of 4+, making it suitable for a wide range of users interested in music production.

## Version history (last 5 releases)

### 2.3.6 — 2026-01-03

- built for iOS26
- provided answers for new age classification scheme

### 2.3.5 — 2025-01-22

- removed possible low level, low-frequency distortion

### 2.3.4 — 2025-01-09

Fixed possible crash + UI recall issues in previous version

### 2.3.2 — 2024-12-17

- fixed automation issues
- built for iOS 18

### 2.3.1 — 2024-04-29

- fixed state recall issue in some hosts
- built for iOS17

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## More apps by Christian Siedschlag

- [Biofeedback Energy Therapy](https://appshunter.io/ios/app/biofeedback-energy-therapy/id882552398)
- [Envelope AU Reverb by DDMF](https://appshunter.io/ios/app/envelope-au-reverb-by-ddmf/id1122066024)
- [6144 equalizer by DDMF](https://appshunter.io/ios/app/6144-equalizer-by-ddmf/id1127457881)
- [NoLimits AU Limiter by DDMF](https://appshunter.io/ios/app/nolimits-au-limiter-by-ddmf/id1202923828)
- [NYCompressor](https://appshunter.io/ios/app/nycompressor/id1241268066)
- [DirectionalEQ](https://appshunter.io/ios/app/directionaleq/id1301365260)

All apps by Christian Siedschlag: https://appshunter.io/developer/538434682

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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 2026-08-25.*