DS18 Subwoofer Box Recommendations 6.5” -21”
We here at DS18 want you to get the absolute best sound and output from your new DS18 speakers. To help our customers, we have designed a set of box specs that can help any novice or professional builders along with questions they may have about enclosure specs. Our engineers and techs have had over 25 years of experience tuning enclosures and cabins for the best bass response. Box specs are not static but can change with every vehicle, every speaker placement, and even weather conditions can affect your vehicles audio. DS18 has combined all our experience together to bring you a set of box specs that would work for most vehicles. This include port specs, box volume, and subwoofer multiplier to further guide you along your journey to the perfect bass response for your vehicle.
Box tuning works in conjunction with the vehicle cabin’s resonate frequency. This effects overall subwoofer sound, tuning, and amplifier output. Through decades of trial and error, we have what we call perfect box specs that will fit most of our subwoofers applications and have the resonate cabin frequency in combination with our box tuning for the perfect sound. These Specs are designed to get the same sound from a 10inch speaker as you would a 15! Output will differ depending on wattage and cone area but there is not a difference in frequency response.
These volumes are NET volume which are after vent and displacement of subs. This box chart will usually land you in the tuning area of 35-40hz for your vehicle tuning. 35-40hz tuning means the enclosure will play down to 28hz and up to 60hz, typically. As stated before, different vehicles will have slightly different tuning but with these specs will sound the same.
| Volume | Drivers / Multiplier | Port Area / Length |
| 0.35^ft | 1x 6.5 | 5.25 sq in. vent x 24.5” long |
| 0.50^ft | 1x or 2x 6.5 | 7.0 sq in. vent x 24” long |
| 0.75^ft | 2x 6.5 or 1x 8 | 11.25 sq in. vent x 22.3” long |
| 1.00^ft | 2x or 3x 6.5 or 1x 8 | 15 sq in. vent x 23” long |
| 1.25^ft | 3x or 4x 6.5 or 1x 8” or 1x 10 | 20 sq in. vent x 29” long |
| 1.50^ft | 3x or 4x 6.5 or 2x 8 or 1x 12 | 24 sq in. vent x 28” long |
| 1.75^ft | 4x 6.5 or 2x 8 or 1x 12 | 28 sq in. vent x 28” long |
| 2.0 ^ft | 4x 6.5 or 2x 8 or 1x 12 | 32 sq in. vent x 27.5” long |
| 2.25^ft | 2x or 3x 8 or 1x 12 | 36 sq in. vent x 27” long |
| 2.50^ft | 3x 8 or 2x 10 or 1x 12 | 40 sq in. vent x 26.5” long |
| 2.75^ft | 3x 8 or 2x 10 or 1x 12 | 44 sq in. vent x 26.5” long |
| 3.00^ft | 3x or 4x 8 or 2x 10 or 1x 15 | 48 sq in. vent x 26” long |
| 3.25^ft | 3x or 4x 8 or 1x 15 | 52 sq in. vent x 25.5 long |
| 3.50^ft | 3x or 4x 8 or 2x 12 or1x 15 | 56 sq in. vent x 25.5” long |
| 3.75^ft | 3x or 4x 8 or 3x 10 or 2x 12 or 1x 15 | 60 sq in. vent x 25” long |
| 4.00^ft | 4x 8 or 3x 10 or 2x 12 or 1x 15 | 64 sq in. vent x 24.5” long |
| 4.25^ft | 4x 8 or 3x 10 or 2x 12 or 1x 15 | 68 sq in. vent x 24.5” long |
| 4.50^ft | 4x 8 or 3x 10 or 2x 12 or 1x 15 | 72 sq in. vent x 24” long |
| 4.75^ft | 4x 8 or 2x 12 or 1x 15 | 76 sq in. vent x 23.5” long |
| 5.00^ft | 4x 8 or 1x 10 or 2x 12 or 1x 15 or 1x 18 | 80 sq in. vent x 23.5” long |
| 5.25^ft | 4x 10 or 2x 3x 12 or 1x 18 | 84 sq in. vent x 23” long |
| 5.50^ft | 4x 10 or 2x 3x 12 or 1x 18 | 88 sq in. vent x 23” long |
| 5.75^ft | 4x 10 or 3x 12 or 1x 18 | 92 sq in. vent x 22” long |
| 6.00^ft | 4x 10 or 3x 12 or 2x 15 or 1x 18 | 96 sq in. vent x 22” long |
| 8.00^ft | 3x 4x 12 or 2x 15 or 1x 21 | 128 sq in. vent x 20” long |
