web archive , SPL response

I doubt there is a database that covers every driver on the market. The woofer itself is likely made specifically for Yamaha. As such, I'd expect that info to be proprietary to Yamaha and/or the woofer manufacturer.

Here's a link to the datasheet for the 2-way DBR12 powered speaker (not the woofer by itself).
https://www.recordcase.de/media/pdf/c0/06/a2/DBR12_datasheet.pdf
The freq response contour for the DBR12 is shown on page 6. The crossover freq is listed as 2.1 kHz. The block diagram indicates DSP, and amps for each driver.