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October 17, 2025

EEVblog 1714 – Presonus Eris Speaker REPAIR (Capacitor Pop Noise)

29 minutes

Classic intermittent “popping” noise from this Presonus Eris 5 studio monitor speaker. Electrolytic Capacitors are suspect number one.

00:00 – Faulty Presonus Eris 5 speaker. Classic “popping” sound.

03:48 – Teardown

07:16 – Testing for popping again

07:36 – Testing for hiss

08:32 – Rectified voltage testing

09:34 – Woah, that’s that?

10:26 – Getting the PCB out

10:55 – A look at the PCB under the microscope

TAD7294:

https://www.st.com/resource/en/datasheet/tda7294.pdf

13:15 – Missing parts

14:39 – Removing the capacitors

16:00 – Measuring the main filter capacitors

17:14 – The Preamp PCB

18:08 – What is the most likely culprit?

20:21 – In-circuit ESR testing

21:32 – All new capacitors

24:15 – Soldering in new caps and testing

25:38 – What did I goof?

27:57 – Conclusion

Forum: https://www.eevblog.com/forum/blog/eevblog-1714-presonos-eris-speaker-repair-(capacitor-pop)/

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By David L. Jones

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