# A540DSP vs BLAM DSP 4

The clearest difference is iOS requirement: BLAM DSP 4 at 9.0 against A540DSP's 15.6. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | A540DSP | BLAM DSP 4 |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 47 months | — |
| Monetization | Free | — |
| Size | 26 MB | 2 MB |
| Requires iOS | 15.6 | **9.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [杏生 卢](https://appshunter.io/developer/1094592555) | [BLAM](https://appshunter.io/developer/1117883429) |

## What reviewers say

### A540DSP

[App page](https://appshunter.io/ios/app/a540dsp/id1423992250)

Control your car amplifier's audio settings, including EQ, bass, and time alignment, directly from your phone. Save and load custom sound profiles for a personalized listening experience.

**Highlights:** 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

**Features:** macOS Compatibility

**In-app purchases:** none


### BLAM DSP 4

[App page](https://appshunter.io/ios/app/blam-dsp-4/id6488414900)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is A540DSP free?

A540DSP is free to download, with no in-app purchases.

### Is BLAM DSP 4 free?

BLAM DSP 4 is free to download, with no in-app purchases.

### Do A540DSP or BLAM DSP 4 have ads?

Neither A540DSP nor BLAM DSP 4 shows ads.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*