KH2501 15″ | 2500w Car Audio Subwoofer

This product has been discontinued under Adire Audio – Please see this replacement product – Colossal Sounds – Ultra 15″


The KH2501 by Adire Audio is designed to meet the needs of the serious basshead that wants major output and power handling. With a massive USA wound 3″ voice coil for increase thermal capacity, we designed the rest of the motor from the ground up using FEA optimization. Using three ultra-high grade Y35 magnets the KH2501 has plenty of motor force and excursion potential. Our custom tooled progressive 3 layer 100% Nomex spider pack with triple sewn lead wires helps keep the moving assembly under control at extreme excursion levels. A non-pressed kraft pulp hybrid fiber blend cone body and a multi-layer foam surround keeps the KH2501 durable for your sonic enjoyment for many years to come. Finished off with 4awg push pin terminals and a laser engraved hydraulic pressed carbon fiber dust cap the KH2501 ready for the most extreme setups. The 12” features our custom tooled AA frame which features the highest marks in strength and clearances. The 2021 Kh2501 Series is designed for monster day driver system, and even competition use for those requiring high linearity and extreme power handling. From a punishing low end to the subtle nuances in your favorite kick drum track, the new Kh2501 delivers!


  • Hi Temp 3” Flat Wound USA Aluminum Voice Coil
  • Non Pressed Paper Cone With Carbon Fiber Dust Cap
  • Heavy Duty Triple Lead Wires Interwoven Into Spiders
  • Y35 Ferrite Magnet Motor Structure w/ Vented Pole
  • Back Plate Radial Venting For Maximum Cooling
  • 2500W RMS Power Rating


Coil Dual 1 or Dual 2
(VC wired in series)
Fs 31.55 Hz | 30.80 Hz
Re 1.43 Ohm | 3.23 Ohm
Qms 5.27 | 4.97
Qes .47 | .48
Qts .43 | .44
Le D1: 1.12 mH
D2: 2.31 mH
Mms 335.29 g | 323.20g
Cms .08 mm/N
Sd 791.73 cm^2
Vas 72.00 L | 73.53 L
SPL D1: 88.26 dB @ 1W/1m
D2: 88.19 dB @ 1W/1m
Bl 14.17 Tm | 19.82 Tm
Xmax 32 mm (One Way)
RMS 2500W – RMS

Box Info

Overall Diameter 15.625″
Cutout Diameter 14.125″
Mounting Depth 11.5″ With Pole Venting – 10.5″ Physical
Driver Displacement .21 ft^3
Sealed Enclosure Not Recommended
Ported Enclosure Range – 3.25-5.0 ft^3
Shipping Weight 59 LBS


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