Review Amplifier NEW ZK-HT21 | OEM Rasa ZK-HT21 3G

This time, I'm reviewing the best-selling Class D amplifier on the market, the ZK-HT21. Although it's OEM, this is a new version—an upgrade from the standard OEM version. This amplifier is more similar to the original Wuzhi Audio ZK-HT21 3G, but at a much lower price. The original Wuzhi HT21 3G costs around 500,000 Rupiah. So, what are the upgrades and what features are added? 1. First, the Bluetooth chip is upgraded, now using the latest version of the Bluetooth chip, similar to the one used in the ZK-AS21P. 2. More optimal cooling. 3. The addition of a subwoofer line-out feature. 4. The addition of a pre-amp line-in feature. Essentially, you can add pre-amp modules such as tone controls, equalizers, mixers, or karaoke modules. I think this amplifier is highly recommended, guys. Music provided by: 1. "Music by Retnik Beats: (https://www.youtube/c/retnikbeatsbe/)" Fast Freestyle Type Beat 2018 'MVP' Banger Type Beat | Retnik Beats    • [FREE] Fast Freestyle Type Beat 2018 'MVP'...   2. Dangdut Instrumental Beautiful Music Perfect for Everyday Play By Achmad Al-Mani    • Musik Indah Cocok Diputar Setiap Hari