

Side-by-side comparison of 996 Down4Sound products and 4 PSI Car Audio products across 10 categories.
| Category | Down4Sound | PSI Car Audio |
|---|---|---|
| Speakers | 556 products $15 – $270 | — |
| Amplifiers | 195 products $112 – $1,260 | 3 products |
| Wiring | 112 products $5 – $300 | — |
| Subwoofers | 68 products $170 – $2,277 | 1 products |
| Batteries | 21 products | — |
| Accessories | 17 products $15 – $85 | — |
| Alternators | 12 products $350 – $350 | — |
| Sound Deadening | 10 products $230 – $230 | — |
| DSP / Processors | 4 products $120 – $120 | — |
| Enclosures | 1 products $759 – $759 | — |