500W Subwoofer amplifier board 4 pairs Toshiba TTC5200 tubes amp board for 15 inch subwoofer speaker or 10-12 inch speaks

This is the active subwoofer amplifier circuit. It can be understood as a subwoofer amplifier without a casing. This way, it can be better placed inside the subwoofer speaker and combined with the speaker body as a whole, which is the active subwoofer we often hear. Amplifier board+speaker+box=active subwoofer. This amplifier board uses a 500W ring transformer and 4 pairs of large Toshiba amplifier tubes to form an 8-ohm rated 500W output. It can easily push the 15 inch subwoofer speak. If equipped with a 10-12 inch speaker, please control the volume properly. It cannot be used as a full frequency power amplifier. Do not understand, please consult before purchasing