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Infinity Primus 3000A

Mono subwoofer amplifier — 300 watts RMS x 1 at 2 ohms

Item # 108P300AM

If you want great power for the subwoofer in your vehicle without emptying your bank account, Infinity's...

If you want great power for the subwoofer in your vehicle without emptying your bank account, Infinity's...

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About the Infinity Primus 3000A

Add bass power

If you want great power for the subwoofer in your vehicle without emptying your bank account, Infinity's Primus 3000A 1-channel subwoofer amplifier may be just what you're looking for. This little powerhouse will send your sub up to 300 watts RMS, giving you lots of low-frequency fun.

Add bass power

If you want great power for the subwoofer in your vehicle without emptying your bank account, Infinity's Primus 3000A 1-channel subwoofer amplifier may be just what you're looking for. This little powerhouse will send your sub up to 300 watts RMS, giving you lots of low-frequency fun.

Works in almost any vehicle

Speaker-level inputs allow this amplifier to work with almost any system, even if you're keeping your factory radio. A low-pass filter and a variable phase control help maximize your subwoofer's performance. The amp also features a fully adjustable bass boost so you can make your subwoofer sound its best.

Infinity Primus 3000A

Primus 3000A input and control panel

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Product highlights:

  • mono subwoofer amplifier
    • 300 watts RMS x 1 at 2 ohms ( 4-ohm rating unavailable)
  • variable low-pass filter (32-320 Hz, 12 dB/octave)
  • variable bass boost (0-12 dB at 40-100 Hz)
  • variable phase adjustment (0-180°)
  • preamp and speaker-level inputs
  • fuse rating: 15A x 2
  • wiring and hardware not included with amplifier
    • 8-gauge power and ground leads recommended
  • dimensions: 9-9/16"W x 2-1/16"H x 5-3/4"D
  • warranty: 1 year
  • Our 60-day money-back guarantee
  • MFR # PRIMUS3000AAM

What's in the box:

  • Mono amplifier
  • Four 15A ATO fuses (2 installed)
  • 12" Speaker-level input harness (5-pin Molex plug)
  • Four M4 x 30mm self-tapping screws
  • 4 Flat washers
  • 4 Split lock washers
  • 4 Plastic screw sleeves
  • 4 Plastic spacers
  • Owner's Manual

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Infinity Primus 3000A reviews

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Infinity Primus 3000A

Crutchfield customer from Parkersburg, WV on 8/23/2019

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Easy to mount and conceal

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Crutchfield customer from Great Falls, MT on 5/13/2019

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Nice amp. It is small, light and doesn't get hot. Great for the JBL 1220 12'' sub I'm pushing with it.

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Features
Controls
Connections

Features

Power Output: The Infinity Primus 3000a monoblock amplifier delivers 300 watts RMS to a 2-ohm load, and 600 watts total peak power. No 4-ohm power spec is provided.

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

Controls

Gain: The Primus 3000a's 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 0.2V - 5V for a line-level input, and 0.5V - 12V for speaker-level input. A small screwdriver (not included) is required to set the gain.

Crossover: The amp features a low-pass filter that is non-defeatable. It eliminates a range of high 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. A small screwdriver is required to adjust the frequency.

Phase: The Primus 3000a features a continuously variable phase control, adjustable from 0° to 180°. While playing bass-heavy music, you should turn the phase control until you find the setting that provides the most bass. If you don't detect any real difference, leave the setting at 0°.

Bass EQ: The amplifier's Bass EQ circuit lets you increase the bass output from 0dB to 12dB. You can also choose the center frequency of the bass boost. This setting is continuously variable from 40Hz to 100Hz.

Connections

Terminals: The Infinity Primus 3000a uses 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).

Power/Ground: The +12V Power and Ground terminals will accept up to 4-gauge wire. It is recommended that you use a minimum of 8 AWG power wire to the battery, with an in-line 30A fuse installed no more than 18" from the battery terminal. An 8 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-Level Input: The amp includes a 12" speaker-level input harness for connecting the amp to a factory radio or aftermarket head unit. You should splice left and right speaker wires from the head unit to the harness and plug the harness 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, you can connect it to either the left or right RCA inputs on the amp.

Speaker Outputs: The amp features screw terminals for connecting one speaker. The amplifier's minimum speaker impedance is 2 ohms, so you can connect any combination of speakers that presents a 2 ohm load or higher.

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Customer Q&A

1 question already asked

Q
I have an old school infinity kappa sub rated at 4 ohm(SVC). Would this 2ohm mono amp be able to run the sub fine, and if so, how much wattage would I loose running this 2ohm amp with a 4 ohm sub?
[ Bill  Jun 03, 2019 ]
2 answers
A
Hi Bill! The Infinity Primus 3000A is actually not rated at a 4ohm load. Since it is only delivering 300 watts RMS at 1 or 2 ohm, going to a 4ohm load would be quite stressful on the amp, but the power rating would drop significantly. I recommend going with an amp that is rated to be compatible with a 4ohm load, and if you need help in finding the perfect match to your setup, we'll be happy to help! You can reach us online via chat, or by phone! 1-800-324-9695
[ Jess  Jun 16, 2019 ]  Staff
A
I bet you'd be getting about 150w at 4ohms. Maybe a little more but not less. For $20 more I would go with the Alpine MRV-M500. It's in the special offers section. It's rated at 300w @ 4ohm.
[ Travis  Jun 14, 2019 ]

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