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I finally got around to augmenting my Animas with 4x passive subs (built by a local guy):



The specs for each sub are as follows:

- 91L sealed enclosure
- 1x 12" driver (blended wood pulp, 19Hz fs)
- no internal crossovers
- 25mm MDF
- 37Kg

Here's how the subs look alongside my Animas:

The system chain is as follows:

- PC with Roon Core (global volume, crossover filters, channel level-matching and driver time-alignment all done here at 64bit precision) -> ethernet

- PC/streamer with RoonBridge -> USB

- Okto dac8PRO 8-channel DAC (for 2x 4-way) -> balanced XLR

- Sealed subs: low-passed @ 70Hz using 36dB/octave filter in DSP -> 2x Rotel RB-1590 amps

- Upper-bass horn: band-passed 70Hz-500Hz using 24dB/octave filter in DSP -> 2x Neurochrome 286 amps

- Mid-horn: band-passed 500Hz-1000Hz using 24dB/octave filter in DSP -> 2x Neurochrome 286 amps

- High-horn: high-passed @ 1000Hz using 24dB/octave filter in DSP -> 2x Neurochrome 286 amps

The main objective was to relieve the upper-bass driver of having to perform near its 32Hz fs. This has resulted in a far more melodic and tuneful upper-bass sound, which I really like. And of course, an extra octave has been added to the bottom end by the subs themselves, which is nice.

Overall, I'm very pleased with the results.

Mani.

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