Splitting a bass into high and low bands and sending only the highs to a delay keeps the low end clean while adding space

Sending the full bass signal to a delay creates muddiness in the low end because the delayed repeats conflict with the dry bass. A multiband split (a crossover or high-pass around e.g. 830 Hz) routes only the high-frequency content into the delay while the low frequencies stay dry and tight. This achieves spatial depth in the high-mid register of a bass without low-frequency phase build-up or mud. The delay itself is then set wet-only (width/mix fully up) since the dry content is already in the mix.

Examples

VCV Rack: copy the bass into Lala (Studio 6+1 crossover) at ~830 Hz; the high output -> Chronoblob delay (ping-pong, wet 100%, feedback reduced) with different left/right delay times; mix the delay return separately from the dry bass.

Assessment

Set up a bass-high split delay in VCV Rack (or explain the signal path): why does this technique keep the low end clean, and at what crossover frequency would the effect become inaudible?