# PZ-C31S

> Car audio DSP tuning and playback app with advanced sound customization. (iPhone/iPad app by huizhou shangshui technology co.,ltd.)

- Source: https://appshunter.io/ios/app/pz-c31s/id6741699898 (this page in markdown: same URL + `.md`)
- Developer: [huizhou shangshui technology co.,ltd](https://appshunter.io/developer/1762340195)
- Category: Utilities
- Price: Free
- Rating: 5.00/5 from 1 App Store ratings · 7 written reviews indexed
- Age rating: 4+
- Requires: iOS 9.0 · 2 MB
- Languages: English
- Released: 2025-02-20
- Data updated: 2026-07-28
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/pz-c31s/id6741699898/reviews.md

## What is PZ?

This product is non-destructive audio car modification of new products,exclusive use of 6-core 32-bit DSP processing Chip,nanosecond processing speed; DRC dynamic music processing; using DSP computer tuning technology. Possess a large-capacity filter capacitor. Lossless installation,easy tuning,take up a small space.
Maximum power output 6×150 W; Large-capacity filter capacitor; 4CH high level/low level  input and 6CH high level output 6X150W/8CH RCA output
Support remote controller(optional)/Wire harness for over 300 different cars. Support Bluetooth play. USB play lossless music. Pair your smartphone with the DSP box and tailor the sound to your personal preference.
Frequency response:20Hz-20KHz. Crossover with Variable Frequency (6/12/18/24/36/48 dB oct). Adjustable sound field delay to achieve spatial editing.
All eight channels with 31 Band floating piont tuning/seperate time. Built-in 31-segment adjustable EQ—31 band EQ floating-point high precision tuning system Visually adjust the Frequency, Gain, and Q value of each channel.
noise gate control
Built in ADEP (Advanced Diagnostics Error Protection),
APP inside music play (New function,you can play your phone music inside sound tuning app directly)
Augmented Bass control，you can control subwoofer volume without use wired remote.Please make sure subwoofer channel set properly.

## Key features

- 6-core 32-bit DSP processing
- DRC dynamic music processing
- Bluetooth and USB music playback
- Smartphone sound customization
- 31-band EQ tuning
- Adjustable sound field delay
- Lossless installation

## Recent user reviews (7 of 7)

All indexed reviews: https://appshunter.io/ios/app/pz-c31s/id6741699898/reviews.md

### 1/5 — アップデート

*2026-05-14, version 1.0.3*

アップデートしてから6チャンネル使用になってます早急に修正して

### 2/5 — Please fix EQ bugs!

*2026-03-13, version 1.0.2*

EQ setting keeps crashing. Complete unusable for setting DSP.   Just functions as a volume knob :(

### 2/5 — 위에분이랑 동일 증상

*2025-12-27, version 1.0.2*

수정해주세요

### 1/5 — カットオフの調節画面で不具合あり

*2025-12-13, version 1.0.2*

カットオフの調節画面が表示されるとアプリが勝手に終了してしまいます。

アプリを再インストールしても同じ様に不具合が発生しているので改善して欲しいです。

久しぶりにセッティングをしようとしたら、アプリが勝手にシャットダウンして操作出来なくなってました。

使い物にならないアプリですのでPCかAndroidのアプリで試してみます。

### 1/5 — アプリが落ちすぎる

*2025-11-30, version 1.0.2*

セッティング中でも容赦なく落ちます

### 4/5 — 오류 업데이트 해주세요

*2025-08-21, version 1.0.2*

다 좋은데 EQ값에서 oct값 클릭만하면 튕깁니다 해결해주세요~

### 5/5 — Useful

*2025-03-08*

Great app

## Frequently asked questions about PZ

### What is PZ-C31S used for?

PZ-C31S is used for non-destructive audio car modifications. It leverages a 6-core DSP chip for advanced sound tuning, offering features like DRC dynamic music processing and smartphone integration for personalized audio.

### Does PZ-C31S support Bluetooth and USB playback?

Yes, PZ-C31S supports both Bluetooth playback and USB playback of lossless music. You can also play music directly from your smartphone within the sound tuning app.

### What kind of sound tuning options does PZ-C31S offer?

PZ-C31S provides extensive tuning capabilities, including a 31-band floating-point EQ for precise frequency, gain, and Q value adjustments on each channel. It also features adjustable sound field delay for spatial editing.

### Is PZ-C31S compatible with my car?

PZ-C31S supports wire harnesses for over 300 different cars, ensuring a lossless and easy installation. It is designed for iPhone and iPod devices.

### What is the power output of PZ-C31S?

PZ-C31S has a maximum power output of 6x150W. It also features 4CH high-level/low-level input and 6CH high-level output, or 8CH RCA output.

### How often is PZ-C31S updated?

The latest version of PZ-C31S is 1.0.4, which was last updated on May 19, 2026. This indicates a recent update, suggesting ongoing development and support.

### What is the age rating for PZ-C31S?

PZ-C31S has an age rating of 4+, making it suitable for a wide range of users. This rating suggests no mature content is present within the application.

### Does PZ-C31S have ads?

No, PZ-C31S does not contain advertisements. The app is free to download and use without any ad interruptions.

## Version history (last 5 releases)

### 1.0.5 — 2026-05-29

Fix known issues.

### 1.0.4 — 2026-05-19

Fix known issues.

### 1.0.3 — 2026-05-11

Fix known issues.

### 1.0.2 — 2025-02-24

Fix known issues

### 1.0.1 — 2025-02-21

Modification: Translate the names of some parameters for correction.

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## More apps by huizhou shangshui technology co.,ltd

- [PZ-C7](https://appshunter.io/ios/app/pz-c7/id6630366976)
- [PZ-X4800S](https://appshunter.io/ios/app/pz-x4800s/id6736720956)
- [PZ-X6800S](https://appshunter.io/ios/app/pz-x6800s/id6736721118)
- [PZ-C31](https://appshunter.io/ios/app/pz-c31/id6736722246)
- [PZ-D8](https://appshunter.io/ios/app/pz-d8/id6743641211)

All apps by huizhou shangshui technology co.,ltd: https://appshunter.io/developer/1762340195

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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 2026-07-28.*