# Alpine R2-W12D4 (Type-R) vs Hertz Mille Pro MPS 300 S4: specs and price compared

A sourced, side-by-side comparison of the Alpine R2-W12D4 (Type-R) (Alpine) and Hertz Mille Pro MPS 300 S4 (Hertz) among car subwoofers. Alpine R2-W12D4 (Type-R) is the cheaper of the two at $449.95.

## Side by side

| Spec | Alpine R2-W12D4 (Type-R) | Hertz Mille Pro MPS 300 S4 |
| --- | --- | --- |
| US price | $449.95 | $680 |
| Brand | Alpine | Hertz |
| Cone size (in) | 12 | 12 |
| Rms power watts | 750 | 500 |
| Peak power watts | 2250 | 1000 |
| Impedance ohms | 4 | 4 |
| Voice coil config | dual-voice-coil | single-voice-coil |
| Sensitivity (dB) | 84.5 | 85 |
| Frequency response (Hz) | 24-200 | 25-400 |
| Enclosure type | component-driver | component-driver |
| Mounting depth (in) | 6.5 | 3.46 |
| Xmax (mm) | 20 | — |
| Weight (lb) | 15 | 14.64 |

## Key differences

- Rms power watts: Alpine R2-W12D4 (Type-R) 750 vs Hertz Mille Pro MPS 300 S4 500
- Peak power watts: Alpine R2-W12D4 (Type-R) 2250 vs Hertz Mille Pro MPS 300 S4 1000
- Voice coil config: Alpine R2-W12D4 (Type-R) dual-voice-coil vs Hertz Mille Pro MPS 300 S4 single-voice-coil
- Sensitivity (dB): Alpine R2-W12D4 (Type-R) 84.5 vs Hertz Mille Pro MPS 300 S4 85
- Frequency response (Hz): Alpine R2-W12D4 (Type-R) 24-200 vs Hertz Mille Pro MPS 300 S4 25-400
- Mounting depth (in): Alpine R2-W12D4 (Type-R) 6.5 vs Hertz Mille Pro MPS 300 S4 3.46
- Weight (lb): Alpine R2-W12D4 (Type-R) 15 vs Hertz Mille Pro MPS 300 S4 14.64

## Sources

- Alpine R2-W12D4 (Type-R): https://www.alpine-usa.com/product/r-series-subwoofer-r2w12d4 (alpine-usa.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/alpine-r2-w12d4-vs-hertz-mille-pro-mps-300-s4/
Cite: Per The Front Desk Review, Alpine R2-W12D4 (Type-R) ($449.95) vs Hertz Mille Pro MPS 300 S4 ($680) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/car-subwoofers/alpine-r2-w12d4-vs-hertz-mille-pro-mps-300-s4/
License: CC BY 4.0.