Name: Infinity Primus 6004a
Brand: Infinity
SKU: 108P6004AM
Price: 189.95 USD
Availability: InStock
Rating: 4 (5 reviews)

OVERVIEW

Written by Crutchfield's Buck P.

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If you want to improve the sound in your vehicle without emptying your bank account, Infinity's Primus 6004a 4-channel amplifier may be just what you're looking for. This little powerhouse will send 60 watts RMS to each of your front and rear speakers, adding the detail and punch that a car stereo just can't muster. Or, you could power your front pair of speakers with the front two channels, then power a subwoofer with up to 140 watts RMS from the rear channels in bridged mode.

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Works in almost any vehicle

Speaker-level inputs allow this amplifier to work with almost any system, which is handy if you're keeping your factory radio. Separate high- and low-pass filters help the amp do its job, whether it's driving speakers or a subwoofer. You can use the built-in bass boost to add more low-frequency fun.

Primus 6004a input and control panel

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Product highlights:

4-channel car amplifier
- 60 watts RMS x 4 at 4 ohms (70 watts RMS x 4 at 2 ohms)
- 140 watts RMS x 2 in bridged mode (4-ohm stable in bridged mode)
variable high- and low-pass filters (32-320 Hz, 12 dB/octave)
variable bass boost (0-12 dB at 45 Hz)
preamp and speaker-level inputs
wiring and hardware not included with amplifier
- 8-gauge power and ground leads recommended
fuse rating: 15A x 2
7-3/16"W x 2"H x 5-3/4"D
warranty: 1 year
Our 60-day money-back guarantee
MFR # PRIMUS6004AAM

What's in the box:

Infinity Primus 6004a owner's manual

4-Channel amplifier
Four 15A ATO fuses (2 installed)
Two 12" Speaker-level input harnesses (5-pin Molex plug)
4 M4 x 30mm screws
4 Flat washers
4 Split-lock washers
Four 2-piece mounting spacers
Owner's Manual
JBL decal

REVIEWS

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DETAILS

Researched by Crutchfield's Mark G.

Features & specs

Performance
RMS Power Output (Watts x Channels)	60 x 4
Peak Power Output (Watts x Channels)	---
Power at 2 Ohms (Watts x Channels)	70 x 4
Bridged Power (Watts x Channels)	140 x 2
Minimum Impedance Bridged	4
Minimum Impedance Unbridged	2
Best Frequency Response	20-20k Hz
THD at Rated RMS Power	1%
Signal to Noise Ratio	75 dB
Input Voltage	14.4v
Features
Amplifier Class	Not Given
Low-Pass Crossover Frequency	32-320 Hz
Low-Pass Slope (dB/octave)	12 dB/oct
High-Pass Crossover Frequency	32-320 Hz
High-Pass Slope (dB/octave)	12 dB/oct
Bass Boost	0-12 dB
Bass Boost Frequency	45 Hz
Fan Cooled	No
Fuse Rating	30
Speaker Level Inputs	Harness
Preamp Outputs	No
Width (inches)	7-3/16
Height (inches)	2
Depth (inches)	5-3/4
Parts Warranty	1 Year
Labor Warranty	1 Year

The Infinity Primus 6004a replaces these items:

Infinity Primus 6004A

Product Research

Features
Controls
Connections

Features

Power Output: The Infinity Primus 6004a 4-channel amplifier delivers 60 watts RMS x 4 at 4 ohms, and 70 watts RMS x 4 at 2 ohms. The power output at 4 ohms bridged is 140 watts RMS x 2. The amp's total peak power is 560 watts.

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 6004a'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. Separate gain controls are provided for the front (Ch1 + Ch2) and rear (Ch3 + Ch4) channels. A small screwdriver (not included) is required to set the gain.

Crossover: The amp features a switchable crossover that can be set to Low Pass, High Pass, or Full Range. If set to Low Pass or High Pass, the cutoff frequency can be set between 32Hz and 320Hz. The crossover has a 12dB per octave slope. Separate crossover controls are provided for the front (Ch1 + Ch2) and rear (Ch3 + Ch4) channels. A small screwdriver is required to adjust the frequency.

Bass EQ: The amplifier's Bass EQ circuit lets you increase the bass output from 0dB to 12dB at 45Hz. Separate Bass EQ controls are provided for the front (Ch1 + Ch2) and rear (Ch3 + Ch4) channels.

Connections

Terminals: The Infinity Primus 6004a 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 Outputs: The amp features screw terminals for connecting four speakers. The amplifier's minimum speaker impedance is 2 ohms in stereo or 4 ohms bridged.

Speaker-Level Input: The amp includes two 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. Separate speaker input harnesses are provided for the front (Ch1 + Ch2) and rear (Ch3 + Ch4) channels.

Line-Level Inputs: The amplifier is equipped with two pairs of RCA inputs for connecting stereo RCA patch cables from the head unit to the amp.