# A540DSP

> Mobile app for controlling car amplifier DSP settings via Bluetooth. (iPhone/iPad app by 杏生 卢.)

- Source: https://appshunter.io/ios/app/a540dsp/id1423992250 (this page in markdown: same URL + `.md`)
- Developer: [杏生 卢](https://appshunter.io/developer/1094592555)
- Category: Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 15.6 · 26 MB
- Languages: Chinese
- Released: 2018-08-12
- Data updated: 2026-06-25
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/a540dsp/id1423992250/reviews.md

## What is A540DSP?

After connecting App to Car Amplifier with Integrated DSP,  EQ, BASS,TIME ALIGNMENT, PHASE, MUTE, FILTER , SAVE SOUND SETTING TO PHONE, SAVE SOUND SETTING TO AMPLIFIER, LOAD SOUND SETTING FROM PHONE, RCA OUTPUT etc could be controlled through this App.

How to use:
1.Install App and turn on power of car
2. Turn on Bluetooth on your iPhone
3,Open App and wait for around 5 seconds, then click “Connect” icon in left corner of bottom. Amplifier will be connected to App automatically.
4.DIY you preferred sound and then click “Save to AMP” icon to save. Or click “ Save to Phone” to save.  

Note：
1.Do not exit app during saving and do not turn off power supply, program may be shut down caused by this.

## Key features

- EQ control
- Bass adjustment
- Time alignment
- Phase and mute settings
- Filter control
- Save sound settings to phone
- Save sound settings to amplifier
- Load sound settings from phone

## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/a540dsp/id1423992250/reviews.md

### 1/5 — Seit Update auf iOS 14.5 kein Equalizer mehr sichtbar

*2021-04-27, version 1.0.1*

Ich habe leider keine andere Möglichkeit gefunden, dem Entwickler diesen Sachverhalt zu schildern, da die Support Links ins Nichts führen. Fakt ist: Seit dem Update auf iOS 14.5 ist der Equalizer in der App nicht mehr sichtbar (weder mit noch ohne verbundene Endstufe) und die App samt DSP-Endstufe somit weitgehend unbrauchbar. Das ich sämtliche möglichen Workarounds (App killen, Neuinstallation etc.) ausprobiert habe, versteht sich von selbst. Bitte schnellstmöglich beheben. Danke!

### 5/5 — MACHT WAS SIE SOLL!!!

*2019-10-31, version 1.0.1*

Funktioniert bei mir tadellos mit iPhone XR. Einfach und übersichtlich gestaltet.

## Frequently asked questions about A540DSP

### How do I connect A540DSP to my car amplifier?

Install the app, turn on your car's power and Bluetooth on your iPhone. Open A540DSP, wait for it to detect the amplifier, and then tap the 'Connect' icon. The amplifier should connect automatically.

### What audio settings can I control with A540DSP?

You can control EQ, BASS, TIME ALIGNMENT, PHASE, MUTE, and FILTER settings. You can also manage sound settings by saving them to your phone or the amplifier, and loading them from your phone.

### Can I save my custom sound settings?

Yes, A540DSP allows you to save your preferred sound configurations. You can save them directly to your phone for later use or load them onto the amplifier itself.

### What devices is A540DSP compatible with?

A540DSP is compatible with iPhone, iPad, and iPod devices. It requires iOS 4.0 or later.

### Is A540DSP free to use?

Yes, A540DSP is available for free download and use. There are no in-app purchases or advertisements.

### How often is A540DSP updated?

The app was last updated on May 11, 2026, with version 1.0.2. This indicates a recent update, suggesting ongoing support and potential for future improvements.

### What is the age rating for A540DSP?

A540DSP has an age rating of 4+, making it suitable for a wide range of users. This rating is based on its content and intended use.

### What should I do if the program shuts down during saving?

To prevent program shutdown during saving, ensure you do not exit the app or turn off the power supply. These actions can interrupt the saving process and cause the program to close.

## Version history (last 3 releases)

### 1.0.2 — 2026-05-11

- Fixed some bugs.

### 1.0.1 — 2019-06-10

Suitable UI for X、XR、XS、XS MAX

### 1.0 — 2018-08-10

No release notes.

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## More apps by 杏生 卢

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- [A500DSP](https://appshunter.io/ios/app/a500dsp/id1142427539)
- [MDA-DSP](https://appshunter.io/ios/app/mda-dsp/id1157857067)

All apps by 杏生 卢: https://appshunter.io/developer/1094592555

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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 2026-06-25.*