{"id":18517,"date":"2018-04-05T11:07:57","date_gmt":"2018-04-05T11:07:57","guid":{"rendered":"https:\/\/audiocentras.lt\/produktas\/focal-sub-p-25-f-car-subwoofer\/"},"modified":"2026-09-29T13:02:52","modified_gmt":"2026-09-29T13:02:52","slug":"focal-sub-p-25-f-car-subwoofer","status":"publish","type":"product","link":"https:\/\/audiocentras.lt\/en\/produktas\/focal-sub-p-25-f-car-subwoofer\/","title":{"rendered":"Focal SUB P 25 F Car Subwoofer"},"content":{"rendered":"

Focal SUB P 25 F<\/strong> is a 25 cm (10-inch) subwoofer designed for installation in an enclosure as part of a car audio system. Two enclosure options are specified: an 18.4 l sealed enclosure or a 25 l bass-reflex enclosure. Choosing between them is the first step when planning where the enclosure will fit in the car. The subwoofer has a flax-fibre cone and a stated power rating of 300 W RMS.<\/p>\n

Choosing an enclosure<\/h2>\n

The specified volume for a sealed enclosure<\/strong> is 18.4 l. This design does not need a bass-reflex port, but it still needs a suitable mounting position for the subwoofer and a sealed cabinet. The specified volume for a bass-reflex enclosure<\/strong> is 25 l. This design also needs a port or tube. The volume alone does not define the port\u2019s dimensions, so those details must be settled when the enclosure is designed.<\/p>\n

Both figures describe enclosure volume, not the outside dimensions of a finished box. When checking the available space in the boot, allow for the thickness of the enclosure walls, the area needed to mount the subwoofer and, for the bass-reflex option, space for the port. Checking these details before ordering or building an enclosure will help you decide which of the two specified designs fits the intended position.<\/p>\n

Cone and construction<\/h2>\n

The stated surface mass of the flax-fibre cone<\/strong> is 320 g\/m\u00b2, and the cone is described as rigid. The updated suspension is designed to allow greater cone excursion, while voice-coil cooling has been optimised. These are features of the subwoofer\u2019s construction; they do not remove the need to choose a suitable enclosure and amplifier for the system.<\/p>\n

Connection and sound adjustment<\/h2>\n

This is a subwoofer intended for enclosure mounting<\/strong>, so a signal from a head unit or processor needs an amplifier channel to drive it. A line-level subwoofer output feeds an amplifier input. The subwoofer then connects to the amplifier\u2019s speaker output. A line-level output cannot power the subwoofer directly.<\/p>\n

When choosing an amplifier, the 300 W RMS rating is a guide to the subwoofer\u2019s stated continuous power handling. It is not the only figure to check: the load presented by the connected subwoofer must also be within the amplifier\u2019s permitted range, and the amplifier\u2019s power output at that load matters.<\/p>\n

The stated 33-500 Hz frequency range<\/strong> is not a crossover setting. Set the low-pass filter on the amplifier or in the car audio system. An initial trial at around 80 Hz can help you hear how the subwoofer blends with the other speakers. From there, adjust the cutoff while listening from your usual driving position. The endpoints of the stated frequency range do not, by themselves, mean that output is equally loud throughout it.<\/p>\n

Position in the car<\/h2>\n

The enclosure\u2019s position and the direction the subwoofer faces affect how much bass you hear in the cabin. Once the chosen enclosure is installed, compare a few possible positions using the same piece of music. Listen from the driver\u2019s seat, where the final balance of the system matters to you. If you choose a bass-reflex enclosure, keep its port clear of luggage and vehicle trim.<\/p>\n

Technical specifications<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n
Model<\/th>\nFocal SUB P 25 F<\/td>\n<\/tr>\n
Type<\/th>\nCar subwoofer<\/td>\n<\/tr>\n
Driver diameter<\/th>\n25 cm (10 inches)<\/td>\n<\/tr>\n
Sealed enclosure volume<\/th>\n18.4 l<\/td>\n<\/tr>\n
Bass-reflex enclosure volume<\/th>\n25 l<\/td>\n<\/tr>\n
Cone<\/th>\nRigid flax-fibre cone; stated surface mass of 320 g\/m\u00b2<\/td>\n<\/tr>\n
Suspension<\/th>\nUpdated for greater cone excursion<\/td>\n<\/tr>\n
Voice coil<\/th>\nOptimised cooling<\/td>\n<\/tr>\n
Power rating<\/th>\n300 W RMS<\/td>\n<\/tr>\n
Frequency range<\/th>\n33-500 Hz<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

FAQ<\/h2>\n

Which enclosure should I choose if boot space is limited?<\/h3>\n

Start by considering the 18.4 l sealed enclosure. It has the smaller specified volume and does not need a bass-reflex port. Before deciding that it will fit, check the outside dimensions of the finished enclosure. Its stated volume alone will not tell you how much space the built box occupies.<\/p>\n

Is a 25 l volume enough information to build a bass-reflex enclosure?<\/h3>\n

Before ordering an enclosure, agree on its outside dimensions, the size of the subwoofer mounting opening, and the location and dimensions of the port or tube with the enclosure builder. Then check that the complete enclosure will fit in its intended position in the car.<\/p>\n

How do I connect it to my car\u2019s head unit?<\/h3>\n

If the head unit has a line-level subwoofer output, connect that output to an amplifier input. Connect the subwoofer to the appropriate speaker output on the amplifier. The head unit\u2019s line-level output supplies a signal to the amplifier; it does not drive the subwoofer directly.<\/p>\n

Does the 300 W RMS rating tell me which amplifier I need?<\/h3>\n

It states the subwoofer\u2019s specified continuous power handling, but that figure alone is not enough to select an amplifier. You also need to account for the load the connected subwoofer presents to the amplifier and the power the amplifier delivers at that load.<\/p>\n

Where should I start when setting the low-pass filter?<\/h3>\n

Try a cutoff around 80 Hz as a starting point, then listen from the driver\u2019s seat. If the bass is too loud relative to the other speakers, lower its level. If you hear a gap between the subwoofer and the other speakers, adjust the filter cutoff. Change one setting at a time so you can hear its effect. The 500 Hz endpoint of the stated frequency range is not a recommended filter setting.<\/p>\n

Can I use it in a system with two subwoofers?<\/h3>\n

For a two-subwoofer system, calculate the total load on the amplifier according to the way the subwoofers will be connected. Each subwoofer also needs a suitable enclosure volume. The 300 W RMS rating for one subwoofer is not enough on its own to plan the complete arrangement.<\/p>\n

Where is the best place to put the enclosure?<\/h3>\n

Begin with a position where the enclosure fits and, if you have chosen the bass-reflex design, its port remains unobstructed. Then compare the available positions and directions while listening from the driver\u2019s seat. Both the car\u2019s cabin and the enclosure\u2019s position affect the bass you hear.<\/p>\n","protected":false},"excerpt":{"rendered":"

Focal SUB P 25 F is a 25 cm car subwoofer designed for installation in an enclosure. Plan for an 18.4 l sealed or 25 l bass-reflex enclosure according to the available space and chosen design. Its construction includes a rigid flax-fibre cone, updated suspension and optimised voice-coil cooling. The stated power rating is 300 W RMS.<\/p>\n","protected":false},"featured_media":18511,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_members_access_role":[],"_members_access_error":""},"product_brand":[],"product_cat":[439,90],"product_tag":[1448,1703,1702,304],"class_list":["post-18517","product","type-product","status-publish","has-post-thumbnail","product_cat-car-audio","product_cat-zemu-dazniu-garsiakalbiai","product_tag-car-subwoofer","product_tag-enclosure-mounted-subwoofer","product_tag-flax-fibre-cone","product_tag-focal","first","instock","shipping-taxable","purchasable","product-type-simple"],"yoast_head":"\nFocal SUB P 25 F - 25 cm Flax-Fibre Cone<\/title>\n<meta name=\"description\" content=\"Focal SUB P 25 F is a 25 cm car subwoofer with a flax-fibre cone. 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