https://stream.echo6.co/videos/watch/daf28a3a-3b07-4cc0-841c-31c3d160b7bc Testing the loudness of a new version of the BM2257 multimeter firmware using the CRY2851 Class 1 sound level meter. PART 2: https://www.youtube.com/watch?v=WbwqOo6IonI https://www.crysound.com/product/cry2851-sound-level-meter/ COUPON CODE: LOUD for 10% off the BM2257 Hardware Store: https://eevblog.store/ 00:00 - BM2257 Firmware changes 01:58 - Crysound CRY2851 Class 1 Sound Level Analyser 06:26 - Lab baseline dBA measurement 07:39 - dBA vs dBC vs dBZ weighting 08:51 - BM2257 Buzzer measurements 10:06 - Low frequency spectral analysis (How Low is Dave's voice?) 11:00 - Designing and building a DIY acoustic test chamber 11:57 - BM2257 frequency spectrum analysis 14:04 - Different angle and distance repeat measurement 15:09 - Conclusion 17:26 - Bonus ventilation fan measurement Forum: https://www.eevblog.com/forum/blog/eevblog-1745-how-loud-is-the-continuity-tester/ Web Site: http://www.eevblog.com Merch Store: https://eevblog.dashery.com/ If you find my videos useful you may consider supporting the EEVblog on Patreon: http://www.patreon.com/eevblog Other channels: EEVblog2: http://www.youtube.com/EEVblog2 EEVdiscover: https://www.youtube.com/eevdiscover #ElectronicsCreators Wed, 10 Jun 2026 08:36:08 GMT https://validator.w3.org/feed/docs/rss2.html PeerTube - https://stream.echo6.co https://stream.echo6.co/client/assets/images/icons/icon-512x512.png https://stream.echo6.co/videos/watch/daf28a3a-3b07-4cc0-841c-31c3d160b7bc All rights reserved, unless otherwise specified in the terms specified at https://stream.echo6.co/about and potential licenses granted by each content's rightholder.