{"id":19532,"date":"2018-04-05T12:05:36","date_gmt":"2018-04-05T12:05:36","guid":{"rendered":"https:\/\/audiocentras.lt\/produktas\/focal-e-25-kx-car-subwoofer\/"},"modified":"2026-09-29T16:12:30","modified_gmt":"2026-09-29T16:12:30","slug":"focal-e-25-kx-car-subwoofer","status":"publish","type":"product","link":"https:\/\/audiocentras.lt\/en\/produktas\/focal-e-25-kx-car-subwoofer\/","title":{"rendered":"Focal E 25 KX Subwoofer"},"content":{"rendered":"

The Focal E 25 KX subwoofer<\/strong> is designed for a custom in-car bass system. This 250 mm model features dual 4 \u03a9 voice coils. Its rated power handling is 600 W RMS, so it requires a separate, appropriately selected amplifier.<\/p>\n

The driver is supplied as an individual system component rather than a complete active subwoofer. It requires a suitable enclosure, an amplifier and low-pass filtering. This type of installation allows the system to be tailored to the vehicle and the electronics being used.<\/p>\n

Construction and purpose<\/h2>\n

The 250 mm diameter<\/strong> identifies the general size class of the driver. This measurement alone is not enough to determine whether it will fit a particular installation. Before building the enclosure, check the actual cut-out diameter and mounting depth separately.<\/p>\n

The K2 Power \u201cW\u201d multilayer composite cone<\/strong> uses a layered construction designed to control cone rigidity and damping. These properties are important when the driver is operating with greater excursion and reproducing low frequencies.<\/p>\n

The voice-coil diameter<\/strong> is 65 mm, while its height is 55 mm. These measurements describe parts of the driver\u2019s internal electromechanical construction. They should not be confused with its installation dimensions, cut-out size or required enclosure depth.<\/p>\n

The magnetic system moves the cone according to the signal supplied by the amplifier. The driver does not contain its own power supply or an integrated amplifier.<\/p>\n

Connecting the amplifier<\/h2>\n

The dual 4 \u03a9 voice coils<\/strong> provide two principal wiring options. Connecting the coils in parallel produces a final load of 2 \u03a9. Connecting them in series produces a final load of 8 \u03a9.<\/p>\n

The wiring arrangement must be chosen according to the loads supported by the amplifier. A 2 \u03a9 configuration is suitable only for an amplifier channel that operates reliably into a 2 \u03a9 load. An 8 \u03a9 connection places a lighter load on the amplifier, but it will generally reduce the amount of power the amplifier delivers.<\/p>\n

Both coils must be connected with consistent polarity. One coil should not be left unused unless that arrangement is specifically required by the system design. Incorrect phase or polarity connections can reduce acoustic output and compromise the intended bass performance.<\/p>\n

The 600 W RMS rated power<\/strong> is the main reference point when selecting an amplifier. The 1200 W maximum power figure does not mean that the driver can operate continuously at that level. Amplifier settings must be adjusted so that the signal is not overloaded or driven into audible distortion.<\/p>\n

Enclosure and installation location<\/h2>\n

This model requires a purpose-designed subwoofer enclosure. A suitable enclosure volume cannot be selected from the 250 mm diameter and power ratings alone. All of the driver\u2019s relevant electroacoustic parameters are required to determine the correct enclosure type and volume.<\/p>\n

Sealed and bass-reflex enclosures operate differently. For this reason, the dimensions of an enclosure designed for another 25 cm driver should not be reused without calculation. An unsuitable enclosure volume or incorrectly tuned port will alter both the frequency response and the mechanical load placed on the driver.<\/p>\n

The enclosure must be secured firmly inside the vehicle. The cone\u2019s movement must not be restricted by trim panels, luggage or other objects. Its orientation can be selected to suit the shape of the luggage compartment, but the final result should be assessed from the driver\u2019s listening position.<\/p>\n

Filtering and system tuning<\/h2>\n

The specified 25-500 Hz frequency range<\/strong> indicates the driver\u2019s frequency limits, but it does not replace an active crossover. The subwoofer requires a low-pass filter provided by an amplifier or audio processor.<\/p>\n

A crossover frequency of approximately 60-80 Hz is a practical starting point for system adjustment. The final setting depends on the front speakers and the acoustics of the vehicle. If the bass can be located too easily as coming from the luggage compartment, try lowering the crossover frequency.<\/p>\n

Amplifier gain should be matched to the source signal rather than treated as a volume control. Begin with a low gain setting and increase it without allowing audible distortion. Careful adjustment helps the front speaker system and subwoofer blend into a more coherent overall balance.<\/p>\n

If the amplifier or audio processor provides phase control, compare its settings from the listening position. Select the setting that produces the smoothest bass response around the crossover region. Phase control is not built into the subwoofer itself.<\/p>\n

The 84.5 dB sensitivity<\/strong> rating was measured at 2.83 V from a distance of one metre. When comparing this driver with other models, use figures stated under the same measurement conditions. Values obtained under different conditions cannot be compared directly.<\/p>\n

Technical specifications<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Model<\/th>\nFocal E 25 KX<\/td>\n<\/tr>\n
Type<\/th>\nCar subwoofer<\/td>\n<\/tr>\n
Driver diameter<\/th>\n10 inches (250 mm)<\/td>\n<\/tr>\n
Voice-coil diameter<\/th>\n65 mm<\/td>\n<\/tr>\n
Voice-coil height<\/th>\n55 mm<\/td>\n<\/tr>\n
System<\/th>\nMagnetic<\/td>\n<\/tr>\n
Cone<\/th>\nK2 Power \u201cW\u201d multilayer composite cone<\/td>\n<\/tr>\n
Rated power<\/th>\n600 W RMS<\/td>\n<\/tr>\n
Maximum power<\/th>\n1200 W<\/td>\n<\/tr>\n
Sensitivity<\/th>\n84.5 dB at 2.83 V \/ 1 m<\/td>\n<\/tr>\n
Frequency range<\/th>\n25-500 Hz<\/td>\n<\/tr>\n
Impedance<\/th>\nDual 4 \u03a9 voice coils<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

FAQ<\/h2>\n

Is this a complete active subwoofer system?<\/h3>\n

No. It is an individual passive driver without an enclosure or integrated amplifier. A complete system will also require a properly calculated enclosure, a power amplifier and suitable signal filtering.<\/p>\n

Which amplifier load configuration should I choose?<\/h3>\n

The pair of 4 \u03a9 voice coils can be wired to produce a final load of either 2 \u03a9 or 8 \u03a9. The correct choice depends on the amplifier\u2019s stability and the power it delivers into the selected impedance.<\/p>\n

Can the subwoofer be connected directly to a car stereo?<\/h3>\n

A direct connection is not suitable for a driver rated at 600 W RMS. A separate power amplifier with a subwoofer channel, or appropriately configured amplifier channels, is required.<\/p>\n

What kind of enclosure should be built?<\/h3>\n

Do not order or construct an enclosure using only the 250 mm size as a guide. The full electroacoustic parameters for this model must first be used to determine the appropriate enclosure type and internal volume.<\/p>\n

How should I set the low-pass filter?<\/h3>\n

The 60-80 Hz range is a suitable starting point for system tuning. The crossover frequency should then be adjusted according to the capabilities of the front speakers and the result heard from the driver\u2019s position.<\/p>\n

Can this model be used in a home stereo or cinema system?<\/h3>\n

It is intended for an in-car audio system and is not a direct replacement for an active home subwoofer. A home installation would require a separate suitable amplifier, an enclosure and an appropriate filtering solution.<\/p>\n

Can one amplifier power two of these subwoofers?<\/h3>\n

Yes, but only after calculating the final impedance of all the voice coils. The resulting load must be supported by the amplifier. A two-driver system will also require a different enclosure design.<\/p>\n

What must be checked before installation?<\/h3>\n

Check the actual cut-out size, mounting depth, enclosure volume and amplifier load. The nominal 250 mm diameter alone does not confirm that the driver will fit in the chosen location.<\/p>\n","protected":false},"excerpt":{"rendered":"

Focal E 25 KX<\/strong> is a 250 mm subwoofer for a custom in-car audio system. Its 600 W RMS rated power means that a separate amplifier is required. Dual 4 \u03a9 voice coils can be wired for a 2 \u03a9 or 8 \u03a9 load, allowing the connection to be matched to the amplifier\u2019s capabilities. The K2 Power \u201cW\u201d multilayer composite cone is used to control mechanical rigidity and damping.<\/p>\n","protected":false},"featured_media":19507,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_members_access_role":[],"_members_access_error":""},"product_brand":[],"product_cat":[439,90],"product_tag":[2353,2349,897,2355,304,2357,1699],"class_list":["post-19532","product","type-product","status-publish","has-post-thumbnail","product_cat-car-audio","product_cat-zemu-dazniu-garsiakalbiai","product_tag-10-inch","product_tag-250-mm","product_tag-car-audio","product_tag-dual-4-","product_tag-focal","product_tag-k2-power","product_tag-subwoofer","first","instock","shipping-taxable","purchasable","product-type-simple"],"yoast_head":"\nFocal E 25 KX - 25 cm Car Subwoofer<\/title>\n<meta name=\"description\" content=\"Focal E 25 KX car subwoofer with 600 W RMS power, dual 4 \u03a9 voice coils and a K2 Power \u201cW\u201d composite cone.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/audiocentras.lt\/en\/produktas\/focal-e-25-kx-car-subwoofer\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Focal E 25 KX Subwoofer\" \/>\n<meta property=\"og:description\" content=\"Focal E 25 KX car subwoofer with 600 W RMS power, dual 4 \u03a9 voice coils and a K2 Power \u201cW\u201d composite cone.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/audiocentras.lt\/en\/produktas\/focal-e-25-kx-car-subwoofer\/\" \/>\n<meta property=\"og:site_name\" content=\"audio centras\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/Audiocentras\" \/>\n<meta property=\"article:modified_time\" content=\"2026-09-29T16:12:30+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/audiocentras.lt\/wp-content\/uploads\/2026\/09\/focal-e-25-kx-1.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"660\" \/>\n\t<meta property=\"og:image:height\" content=\"354\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"5 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/audiocentras.lt\\\/en\\\/produktas\\\/focal-e-25-kx-car-subwoofer\\\/\",\"url\":\"https:\\\/\\\/audiocentras.lt\\\/en\\\/produktas\\\/focal-e-25-kx-car-subwoofer\\\/\",\"name\":\"Focal E 25 KX - 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