About the Infinity Reference 7540a
Whether you're building a component system, powering a pair of full-range speakers, or just pounding away with a subwoofer, there's an Infinity Reference series amp ready to take on the job. Boasting impressive power ratings and fine-tuned controls, these amplifiers are capable of sending your music to new sonic heights.
It's all thanks to high-output MOSFET power supplies — which ensure maximum power delivery to your speakers for efficient operation — and variable filters that let you contour the output to fit your music. And, since every Infinity Reference amplifier is CEA-2006 compliant, you'll know you'll get the power as advertised.
Whatever your power needs, the versatile Infinity Reference 7540a multi-channel amplifier can take care of them. With 111 watts RMS x 4 channels, it can easily drive two sets of full-range or component speakers. Or, you can bridge the channels to stereo mode, and send 278 watts RMS each to a pair of subwoofers or component speaker system.
Product highlights:
- 4-channel car amplifier
- 111 watts RMS x 4 at 4 ohms (139 watts RMS x 4 at 2 ohms)
- 278 watts RMS x 2 at 4 ohms in bridged mode (4-ohm stable in bridged mode)
- 2-, 3-, or 4-channel output
- variable high-/low-pass filters (32-320 Hz, 12 dB/octave)
- variable Bass EQ (0-12 dB @ 50 Hz)
- CEA-2006 compliant
- preamp- and speaker-level inputs
- preamp outputs
- 8-gauge power and ground leads recommended — hardware and wiring not included with amplifier
- 16-3/8"W x 2-11/16"H x 12-1/8"D
- fuse rating: 30A x 2
- warranty: 1 year
- MFR # Reference 7540a
What's in the box:
Infinity Reference 7540a owner's manual
- 4-Channel amplifier with two installed 30A ATC fuses
- Two 11" speaker-level input harnesses
- Two 30A ATC fuses
- 4 Self-tapping screws
- 1 Silica gel packet
- One 8" x 2-1/2" Infinity sticker
- Instructions
- Amplifier Quick Start Guide
- Warranty card
Customer reviews for Infinity Reference 7540a
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More details on the Infinity Reference 7540a
Features & specs
| Performance | ||
|---|---|---|
| RMS Power Output (Watts x Channels) |
111 x 4 | |
| Peak Power Output (Watts x Channels) | N/A | |
| Power at 2 Ohms (Watts x Channels) | 139 x 4 | |
| Power at 1 Ohm (Watts x Channels) | --- | |
| Bridged Power (Watts x Channels) | 278 x 2 | |
| Minimum Impedance Bridged | 4 | |
| Minimum Impedance Unbridged | 2 | |
| Minimum Impedance | 2 | |
| Best Frequency Response | 10-100k Hz | |
| THD at Rated RMS Power | 1% | |
| Signal to Noise Ratio | 81 dB | |
| Input Voltage | 14.4v | |
| Features | ||
| Amplifier Class | AB | |
| Low-Pass Crossover Frequency | 32-320 Hz | |
| Low-Pass Slope (dB/octave) | 12 dB | |
| High-Pass Crossover Frequency | 32-320 Hz | |
| High-Pass Slope (dB/octave) | 12 dB | |
| Bass Boost | 0-12 dB | |
| Bass Boost Frequency | 50 Hz | |
| Fan Cooled | No | |
| Fuse Rating | 30 x 2 | |
| Speaker Level Inputs | --- | |
| Preamp Outputs | 1 pair | |
| Width (inches) | 17-9/16 | |
| Height (inches) | 2-11/16 | |
| Depth (inches) | 12-1/8 | |
| Parts Warranty | 1 Year | |
| Labor Warranty | 1 Year | |
Product Research
Features
Inputs and Outputs Notes
Status LEDs: The amplifier has the following status LEDs:
- Clip: indicates the amplifier is being overdriven, and your speakers may be in danger. This should blink only on musical peaks, and not be on constantly.
- Power: indicates the amplifier is on
- Protect: indicates any of the following problems: DC voltage on amplifier output, overheating, under voltage, over voltage, and short circuit in the speakers or wire
Variable Filters: The front and rear channels have separate filters. Each filter can be set for low-pass, high-pass, or full-range operation. In the low-pass and high-pass modes, each filter can be adjusted from 32 to 320 Hz. In each case, the filter has a slope of 12 dB per octave.
Bass Boost: For added low frequency performance, this amplifier has a 0 to 12 dB variable bass boost centered at 50 Hz.
Preamp Outputs: The preamp output jacks provide a convenient source for daisy-chaining an additional amplifier without running an extra set of RCA cables from the front of the vehicle to the amplifier location. These outputs provide a full-range signal.
Right Side of Amplifier:
- +12V (power): 0.357" screw terminal
- Remote: 0.357" screw terminal
- GRD (ground): 0.357" screw terminal
- Speakers: 0.357" screw terminals
Left Side of Amplifier:
- Front High Level Input: 4-pin jack for use with supplied speaker-level input harness
- Rear High Level Input: 4-pin jack for use with supplied speaker-level input harness
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Customer Q&A
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Very nice. I am running it in 4 channel mode pushing two sets of polk audio speakers. The quality of the sound is beyond reproach. Only problem is that the power/ground block is the plated kind not the block kind so its tough to get a 4 or even 8 gauge wire in there. But overall, very nice.
mailman from Columbia, MD