Comparison

PRO2500A vs HB II DSP

Price, ratings, monetisation and update history for both apps, side by side β€” with what reviewers say about each.

Head to head
About

PRO2500A

Features
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Connect smart devices and read song information from USB drives

About

HB II DSP

Features
Read full description

The Harmony DSP App allows you to setup and tune your system with your smart phone or tablet. In the main screen you will find the Input Source menu where you can choose BT, HI-LEV, USB and AUX. Here you also find 6 Presets (saved into your device) to choose from, you access the Music Player, you have the Main and Subwoofer Volume, and the Advanced menu with Channels, EQ, System and Mixing. From the Channel Page, you can assign the function of each speaker, check the Phase for polarity, adjust the individual Channel Gains and set Delay in milliseconds or centimeters, for a rock solid and accurate front stage. The EQ page holds the heart and the brains of the App. You can use either the Graphic or the Paragraphic EQ’s. You can customize the crossovers to fit the needs of your individual system. You have adjustments for Gain, frequency, and Q factor. You can work on channels individually or you can link them. With the MIX function you can manually determine which inputs (USB-L/R, Digital-L/R, BT-L/R) will be used for each output (processing channel) and how much of each input the output will receive. The new Music Player function lets you have full control of all your favorite songs, inside the App. Be sure to connect a proper USB device containing audio files in the supported format. From the App it is possible to access the folders and the contained audio files.

Screenshots

PRO2500A4 screens
HB II DSP4 screens

Verdict

The call

The clearest difference is update cadence: HB II DSP at fortnightly against PRO2500A's every 2 months. On price, ads, in-app purchases and device support there is nothing between them.

Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS

CostPrice Β· In-app purchases Β· Ads Β· Monetization

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

UpkeepUpdate frequency

PRO2500A ships an update every 2 months, HB II DSP fortnightly. The most recent releases landed on October 9, 2026 and October 13, 2026 respectively.

Scorecard1 real difference Β· 5 level
PRO2500A versus HB II DSP: the parameters behind the verdict, then further details
ParameterPRO2500AHB II DSP
PriceFreeFree
Update frequencyEvery 2 monthsFortnightly β€” better
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPodiPhone, iPod
Requires iOS15.615.6
Further details β€” not scored
Size4 MB3 MB
Age rating17+4+
Developer明武 伍APEX Italy

In-app purchases

None

PRO2500A

No in-app purchases

None

HB II DSP

No in-app purchases

Questions

Is PRO2500A free?
PRO2500A is free to download, with no in-app purchases.
Is HB II DSP free?
HB II DSP is free to download, with no in-app purchases.
Do PRO2500A or HB II DSP have ads?
Neither PRO2500A nor HB II DSP shows ads.
Which is updated more often, PRO2500A or HB II DSP?
PRO2500A ships an update every 2 months, and HB II DSP fortnightly. Most recently, PRO2500A was updated on October 9, 2026 and HB II DSP on October 13, 2026.

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