# Sundown Audio SA-12 v.2 D2 vs Hertz Mille Pro MPS 300 S4: specs and price compared

A sourced, side-by-side comparison of the Sundown Audio SA-12 v.2 D2 (Sundown Audio) and Hertz Mille Pro MPS 300 S4 (Hertz) among car subwoofers. Sundown Audio SA-12 v.2 D2 is the cheaper of the two at $419.99.

## Side by side

| Spec | Sundown Audio SA-12 v.2 D2 | Hertz Mille Pro MPS 300 S4 |
| --- | --- | --- |
| US price | $419.99 | $680 |
| Brand | Sundown Audio | Hertz |
| Cone size (in) | 12 | 12 |
| Rms power watts | 1250 | 500 |
| Peak power watts | 2500 | 1000 |
| Impedance ohms | 2 | 4 |
| Voice coil config | dual-voice-coil | single-voice-coil |
| Sensitivity (dB) | 86.59 | 85 |
| Frequency response (Hz) | — | 25-400 |
| Enclosure type | component-driver | component-driver |
| Mounting depth (in) | 7.5 | 3.46 |
| Xmax (mm) | 19 | — |
| Weight (lb) | — | 14.64 |

## Key differences

- Rms power watts: Sundown Audio SA-12 v.2 D2 1250 vs Hertz Mille Pro MPS 300 S4 500
- Peak power watts: Sundown Audio SA-12 v.2 D2 2500 vs Hertz Mille Pro MPS 300 S4 1000
- Impedance ohms: Sundown Audio SA-12 v.2 D2 2 vs Hertz Mille Pro MPS 300 S4 4
- Voice coil config: Sundown Audio SA-12 v.2 D2 dual-voice-coil vs Hertz Mille Pro MPS 300 S4 single-voice-coil
- Sensitivity (dB): Sundown Audio SA-12 v.2 D2 86.59 vs Hertz Mille Pro MPS 300 S4 85
- Mounting depth (in): Sundown Audio SA-12 v.2 D2 7.5 vs Hertz Mille Pro MPS 300 S4 3.46

## Sources

- Sundown Audio SA-12 v.2 D2: https://sundownaudio.com/products/sundown-audio-sa-series-v-2-12-1000w-car-audio-subwoofer-sub (sundownaudio.com, verified 2026-07-11)
- Hertz Mille Pro MPS 300 S4: https://hertz-audio.com/product/mps-300-s4/ (hertz-audio.com, verified 2026-07-11)

Canonical: https://frontdeskreview.com/gear/car-subwoofers/sundown-audio-sa-12-v2-d2-vs-hertz-mille-pro-mps-300-s4/
Cite: Per The Front Desk Review, Sundown Audio SA-12 v.2 D2 ($419.99) vs Hertz Mille Pro MPS 300 S4 ($680) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/car-subwoofers/sundown-audio-sa-12-v2-d2-vs-hertz-mille-pro-mps-300-s4/
License: CC BY 4.0.