Bass XXL by Denise Audio adds harmonics above a root frequency, in parallel with your untouched signal. TurboBass also adds harmonics, but it splits the signal at a crossover, so you can turn the original sub down or off as well. That one difference decides a lot of what each is good at.
| Denise Audio Bass XXL | TurboBass | |
|---|---|---|
| How the harmonics are added | In parallel; the dry signal is left untouched | Crossover; the original bass below it has its own level, down to off |
| Frequency | Root: set in Hz, as a note name, or from incoming MIDI notes | Crossover, 40 to 200 Hz |
| Harmonic controls | Harmonics (intensity), Boost (amount added), Range, Slope, Pre-Delay | Harmonics level, Tone (even to odd), Character (brightness), Drive, Range, Sustain, Dynamics |
| Even against odd harmonics | Not adjustable | Tone, from warm (even) to growl (odd) |
| Original bass level | Not adjustable (parallel processing) | +6 dB to off |
| Upper-bass weight | Not built in | Body: boosts the octave or so above the crossover |
| Oversampling | On/off switch | Not adjustable |
| Gain | Input and output | Output; soft limiter on the added signal |
| Display | Spectrogram of the harmonics and the dry signal | Response graph with draggable controls, harmonic shape, level law |
| Factory presets | 48 | 24 |
| Plug-in formats | AAX, AU, VST2, VST3 | AU, VST3 |
| Platforms | macOS and Windows | macOS (Windows in the works) |
| Licensing | Perpetual, or in a Denise and Baby Audio subscription | Perpetual; one computer at a time, works offline after activation |
| Price | $79 list; often on sale | $29.99, free 1.x updates |
| Trial | No time limit; 5 s of silence every 60 s | 3 days, then the output is muted for 2 s every 20 s |