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Infinity Kappa K1000

Mono subwoofer amplifier — 1,000 watts RMS x 1 at 2 ohms

Item # 108K1000

Infinity's Kappa K1000 mono subwoofer amplifier supplies your subwoofer with up to 1,000 watts RMS — good...

Find what Fits your car

Infinity's Kappa K1000 mono subwoofer amplifier supplies your subwoofer with up to 1,000 watts RMS — good...

Discontinued item
6 questions - 16 answers

Item # 108K1000

About the Infinity Kappa K1000

High tech and stylish

Infinity's Kappa K1000 mono subwoofer amplifier supplies your subwoofer with up to 1,000 watts RMS — good news for all you bass fans out there. The space age-looking brushed aluminum chassis features dancing, signal-level LEDs which add to the amp's high-tech look and overall coolness factor.

High tech and stylish

Infinity's Kappa K1000 mono subwoofer amplifier supplies your subwoofer with up to 1,000 watts RMS — good news for all you bass fans out there. The space age-looking brushed aluminum chassis features dancing, signal-level LEDs which add to the amp's high-tech look and overall coolness factor.

Connectivity is the name of the game

This amplifier can accept low- or speaker-level inputs so it'll work in almost any system. Infinity includes screw-on RCA-to-bare wire adapters with the amp to make sure you can make the proper connections. The Kappa K1000 sub amp will integrate perfectly into a system that uses a matching Infinity Kappa K2 or Kappa K4 full-range amplifier with its handy Bluetooth® connection.

Good with bass

A low-pass filter clears the way for your sub to play clean, powerful bass. The Kappa K1000 subwoofer amp also features Infinity's Dynamic Bass Optimizer (DBO™) circuitry, which uses a subsonic filter and bass boost to optimize the performance of your sub and enclosure combo.

Infinity K1000 1000W x 1 Car Amplifier

Kappa K1000 input and control panel

Confused about impedance? Check out our article on matching subs and amps.


Product highlights:

  • mono subwoofer amplifier
  • 700 watts RMS x 1 at 4 ohms (1,000 watts RMS x 1 at 2 ohms)
  • variable low-pass filter (32-320 Hz, 12 dB/octave)
  • Dynamic Bass Optimizer uses variable bass boost (0-12 dB at 45 Hz) and subsonic filter (10-80 Hz, 12 dB/octave)
  • phase switch (0, 180 degrees)
  • preamp and speaker-level inputs
  • speaker wire-to-RCA adapters included
  • fuse rating: 35A x 3
  • 4-gauge power and ground leads recommended — wiring and hardware not included with amplifier
  • 13-1/8"W x 1-13/16"H x 6-15/16"D
  • warranty: 1 year
  • Our 60-day money-back guarantee
  • MFR # K1000

What's in the box:

  • Mono amplifier
  • Six 35A ATO fuses (3 installed)
  • 2 Bare wire-to-RCA adapters
  • 4 Mounting screws (M4 x 52mm)
  • Quick Start Guide

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Infinity Kappa K1000 reviews

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Overview: The Infinity Kappa K1000 is part of the Kappa series of high-performance amplifiers. This Class D mono subwoofer amplifier will accept both high-level and low-level inputs. Class D amplifiers are highly efficient and compact, generating a lot of power without drawing much current or generating heat. The amp comes with spare fuses, speaker wire-to-RCA adapters, and mounting hardware.

Power Output: The Kappa K1000 delivers the following power output:

  • 700 watts x 1 at 4 ohms (<0.1% THD+N)
  • 1000 watts x 1 at 2 ohms (<0.1% THD+N)

Protection Circuitry: The amplifier features protection circuitry for thermal overload, over- or under-voltage (<9V or >16V), and short circuits. The LED on the top of the amp glows red if the amp goes into protection mode.

Controls: The Kappa K1000's controls are located on one side of the amplifier. The rotary controls require a small screwdriver (not included) to make adjustments. The amp controls include:

  • Gain: The rotary gain control let you match the amp's input sensitivity to the output of the source unit. The input sensitivity range of the amplifier is 0.2V and up for a low-level input, and up to 20V for speaker-level input.
  • Input Level: The Input Level switch lets you select the type of input you are using. For high-level input, there are two settings: Hi1 and Hi2. If the audio system fails to play with an amplifier connected to its output, or you get a "speaker disconnected" message on your factory stereo, set the switch to the Hi2 position. The Hi2 position includes a circuit design to fool this type of factory system into "seeing" a speaker connected to its output.
  • Crossover: The amp features a non-defeatable low-pass filter that determines the upper limit of the frequencies that are sent to the subwoofer. You can adjust the cutoff frequency of the low-pass filter from 32Hz to 320Hz using the rotary control.
  • Bass Boost: The Kappa K1000 has a variable 0-12dB bass boost, centered at 45Hz. This allows you to dial in the amount of bass according to your personal taste.
  • Subsonic Filter: The amplifier has a subsonic filter that eliminates super-low frequencies that rob amplifier power and can damage speakers. This high-pass filter is variable from 10Hz to 80Hz, and has a 12dB/octave slope.
  • Phase Switch: The amp has a 2-way Phase Switch that lets you invert the phase of the speaker output by 180°. When the subwoofer is out of phase with the other speakers in the vehicle, sound waves cancel each other and the bass response suffers. If the bass response is poor, inverting the phase of the subwoofer may improve it.

Connections: The Infinity Kappa K1000 uses set screw terminals for the +12V power, ground, turn-on (remote) lead, and speaker outputs. The screws can be tightened/loosened with a Phillips-head or flat-head screwdriver (not provided). The amp connections include:

  • Power/Ground: The +12V Power and Ground terminals will accept up to 4-gauge wire. It is recommended that you use a minimum of 4 AWG power wire to the battery, with an in-line 100A fuse (or higher) installed no more than 18" from the battery terminal. A 4 AWG ground wire (minimum) is also recommended, and attached to a metal area close to the amplifier.
  • Remote Turn-On: The Remote screw terminal will accept up to 8 AWG wire. Typically, an 18 AWG turn-on lead is included in an amplifier wiring kit.
  • Speaker Outputs: The amp features screw terminals for connecting two speakers. The terminals are wired internally in parallel. The amp's minimum speaker impedance is 2 ohms, so you can connect one or two 4-ohm subwoofers, a 2-ohm subwoofer, or one subwoofer with dual 4-ohm voice coils.
  • Speaker-Level Input: The amp includes two bare wire-to-RCA adapters for connecting the amp to a factory radio or aftermarket head unit without preamp outputs. You should attach the left and right speaker wires from the head unit to each adapter and plug the adapter's RCA plug into the amp.
  • Line-Level Inputs: The amplifier is equipped with one pair of RCA inputs for connecting stereo RCA patch cables from the head unit to the amp. If your source unit only has one subwoofer output, a "Y" adapter should be used to split the mono signal into two outputs.

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Customer Q&A

6 questions already asked

Would anyone suggest this amp for three 10" terminator subs @ 150 RMS each, 4 ohm SVC in a sealed box?
[ B rabbit  Jan 07, 2019 ]
5 answers
I bought this amp for My son running 2 12" subs in his car. Have never had any troubles. Works great! We can here him coming from mikes away. We would buy again
[ GREGG  Jan 14, 2019 ]  Staff
Should be fine. This amp added alternator whine to my vehicle which I didn't have with Rockford fosgate amps. But definitely much better sound than RF.
[ pavel  Jan 13, 2019 ]  Staff
I would not, that amp is too much power for those subs. However if you were to buy a fourth sub and wired all of them together at 4 ohms this amp would be perfect
[ Eric  Jan 13, 2019 ]  Staff
yes you will have more than enough power
[ eric  Jan 13, 2019 ]  Staff
You won't find a better amp, this amp will shred those subs . Very well built amp. But I really suggest putting this amp on 12's.
[ ROBERT  Jan 12, 2019 ]  Staff
I wanna buy the 12'' kicker L7R, two of them in a single enclosure... they require 1200 watts of power... is this item able to take care and provide the best sound quality from the subs?
[ JAVAN  Jan 04, 2019 ]
2 answers
Enter This amplifier works well my JL box 2 of 10 inches w2 the sound is good. But I am aware that the kicker w7 need a lot of power, more than my JL. I was a car sound installer and work the Kicker and you need a lot power to work them and that they listen well   answer to this question.
[ agustin  Jan 05, 2019 ]  Staff
I would get a bigger amp so it's not being maxed out! I use it to push 1-12" Infinity Kappa perfect VQ series. I had the gain a little over half way turned up for just one. Each of my speakers as I have 2 but only use 1 can take a 1000+ watt amp per speaker
[ Shawn  Jan 04, 2019 ]  Staff
is the infinity one k 1000 enough for kicker l7 15" ?
[ India  Dec 25, 2018 ]
2 answers
Yes, it will match perfect. Make sure you order the 4ohm DVC version
[ Nicholas  Dec 25, 2018 ]  Staff
It does around 1200 rms on a dyno. Should push one pretty good for sure. Make sure sub is running at 2 ohms. I am running 2 rf p3 10"s pretty hard on mine.
[ RUSSELL  Dec 25, 2018 ]  Staff
is the only difference in the infinity k1000 and the one k a bass knob?
[ India  Dec 25, 2018 ]
2 answers
Thanks for your question. For information on comparing two or more models I would recommend reaching out to an Advisor by phone (1-800-324-9695) or online chat. They will be able to help determine the differences and help you make the best choice for your system and your budget.
[ Krissy  Dec 29, 2018 ]  Staff
Depends on what you mean by kappa 1, but based on what I know about the k1000 its stronger, doesnt overheat easily, and you can hook up 2 or more high wattage subs to the k1000 since it's got the juice to support it.
[ Tinh  Dec 25, 2018 ]  Staff
I just bought 2- JL Audio 10tw3-d4 subs and was wondering if this amp would work well with it?
[ Larry  Jul 28, 2018 ]
1 answer
Thanks for your question. For information on selecting the best amp for your subs I would recommend reaching out to an Advisor by phone (1-800-324-9695) or online chat. They will be able to help determine the differences between the amp models and help you make the best choice for your system.
[ Krissy  Jul 30, 2018 ]  Staff
Do you think this amp will be good for a 10" Infinity Reference Series 1042W subwoofer?? I'm ready to buy but I'm not sure what to go with... Any help would be greatly appreciated!! Thanks a bunch, in advance!!! Don W., TX
[ Don  Feb 09, 2018 ]
4 answers
This Amp is way better than it turns out to be i recommend this to any body using a sub that requires less than 1000 watts. Matter of fact this baby can power two of those infinity 10" with power to spare. Im still using it today and works like a charm doesnt overheat
[ Tinh  Jun 29, 2018 ]  Staff
I'm pushing a 4ohm MTX thunder 7500 10" in a sealed box and it's great. This amp does 600W at 4 ohms.
[ Jordan  Feb 11, 2018 ]  Staff
[ James  Feb 10, 2018 ]  Staff
It runs my pair of fasgate 12's just fine. I would think it would be more than enough for you 10's.
[ JASON  Feb 10, 2018 ]  Staff

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