Contour Guide Devices Install 中文
TRN Black Pearl EQ app for Android
Contour EQ is a free, open-source Android app that reads and writes the parametric EQ stored inside the TRN Black Pearl. The EQ stays in the dongle, so it works in every app and on every device you plug it into.
Stable 1.6.6
What Contour does on the Black Pearl
| Supported since | Contour 1.5.2 |
|---|---|
| USB ID (VID:PID) | 3302:43E8 |
| Chip / protocol | WalkPlay |
| EQ | Read and write; every send is read back from the DAC |
| Bands | 10 |
| Filter types | PEAK, LOW SHELF, HIGH SHELF |
| Gain | -10 to +10 dB |
| Q | 0.1 to 10 |
| Frequency | 20 Hz to 20 kHz |
| Preamp | -30 to 0 dB, whole dB |
| Where the EQ is kept | In the DAC's memory: one EQ, no slots. It stays after unplugging, preamp included. |
| DAC page | Since 1.6.4: FILTER (FAST-LL, FAST-PC, SLOW-LL, SLOW-PC, NON-OS), OUTPUT (CLASS H, CLASS AB), GAIN (LOW, HIGH) and BALANCE, up to 15 steps to either side. Each change is read back and stays after unplugging. |
| Tested | By the developer on hardware and on a test rig, October 2026, firmware 0.6. First reported working by u/Master_Cartoonist_16 on Reddit. Firmware 0.5 confirmed by sebu on Discord with Contour 1.6.5, November 2026. |
What Contour does not do on the Black Pearl
- Firmware updates.
- LOW PASS and HIGH PASS filters. The Black Pearl stores them, but they wait for a measurement on the test rig.
- Hardware volume.
- Resetting the DAC.
Contour EQ and the WalkPlay web tool
The WalkPlay web tool also works with the Black Pearl. WalkPlay offers LOW PASS and HIGH PASS filters, which Contour does not offer for this DAC yet. Contour's DAC page has the same four settings WalkPlay offers for the Black Pearl: FILTER, OUTPUT, GAIN and BALANCE. Contour runs on the Android phone the dongle is plugged into, keeps your profiles in a library on the phone and needs no internet or account.
Using Contour with the Black Pearl
- Plug your headphones into the Black Pearl first. Without headphones it does not show up on USB at all, and Contour shows NO DAC.
- Send a profile with HOLD TO SEND. Contour reads every band back from the DAC, and the EQ and the preamp stay in the Black Pearl after unplugging.
- If you also use WalkPlay, send your profile from Contour again afterwards: WalkPlay sets the preamp to 0 dB every time it connects.
Everything else works the same on every DAC: How to use Contour.
Questions about the Black Pearl
Is there an EQ app for the TRN Black Pearl on Android?
Yes. Contour EQ reads and writes the Black Pearl's 10-band EQ and preamp from an Android phone. It is free and open source (Apache 2.0). The WalkPlay web tool also works with this DAC.
Does the EQ work on a PC or an iPhone?
Yes. The EQ is stored in the Black Pearl, so it plays on every device you plug the dongle into, PCs, Macs and iPhones included. You need an Android phone only to change it with Contour.
Can Contour update the Black Pearl's firmware?
No. Contour does not update firmware. It reads and writes the EQ, the preamp and the four settings on the DAC page.
Does Contour work on a Black Pearl with firmware 0.5?
Yes, since Contour 1.6.5. Some units (seen on firmware 0.5) answer the preamp query with an extra byte that Contour 1.6.4 and earlier refused: the Library showed the DAC as connected, but its DAC page stayed empty and every send stopped with SEND INTERRUPTED. Contour 1.6.5 no longer checks that byte, so if you see this, update Contour.
Black Pearl specs and prices on soundblooms.com