DB Drive Speed Series User Manual - Page 4

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1. Product Specifications

Frame Diameter

Mounting Depth

Cutout Diameter

Frame Diameter

Mounting Depth

Cutout Diameter

RECOMMENDED ENCLOSURE

The purpose of the information below is to help you select the most appropriate type of enclosure for your

application. We have selected the two most popular enclosure types and their performance benefits.

Sealed Enclosure (Air-Suspension design): Characteristically simpler to make, sealed enclosures usually are

better at controlling the woofer's excursion and performance at lower frequencies. The added control allows

for higher power handling or use of a bigger amplifier. The secret is to maintain a perfect seal. Using Glues

and sealants at all seams is recommended to prevent leaks and integrity of the enclosure. The size or volume

of the enclosure will directly affect the performance of the woofer. Smaller enclosures generally provide the

desired bump to the frequency response curb and Greater SPL. Larger enclosures will provide a lower but

flatter response for deeper bass. In general, the benefit to the sealed enclosure versus a ported enclosure

is a smaller foot print, simpler build with higher power handling, a more linear flat response, superior sound

quality and extended low frequency output.

Ported Enclosure (Bass-Reflex or Vented): A ported enclosure is simply a sealed enclosure with a port or

vent added to the sealed design for the purpose of tuning the enclosure to higher output at the desired

tuned frequency, typically 3db or higher. Another advantage of a ported enclosure is the reduction of cone

motion for the speaker, thus distortion at higher power levels within the tuned frequency response of the

port. A drawback is that building a ported enclosure is more complex than sealed. Having the wrong port or

vent could result in poor sound, and the potential of damaging a woofer when played too loud or out of the

tuning frequency. Thus we recommend not guessing, please follow the guidelines listed in this manual or go

to a professional. In General, the benefit of a ported enclosure versus a sealed is higher volume output at the

tuned frequency, stronger bass output with lower power input.

Construction: We recommend using ¾" MDF (Medium Density Fiberboard) for the construction of an

enclosure. It is critical for the side walls of the enclosure not to flex due to the pressure generated by the

woofer, bracing might be required. The enclosure sides should be secured together with nails/screwed. We

also recommend the use of glues and sealants to maintain the integrity of the enclosure and eliminate leaks.

PRODUCT DIMENSIONS

SPF10D4

10.43 in. / 265 mm

3.5 in. / 89 mm

9.05 in. / 230 mm

12.43 in. / 315 mm

11.18 in. / 284 mm

SPF12D4

3.5 in. / 89 mm