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Rockford Fosgate Prime R250X1

Mono subwoofer amplifier — 250 watts RMS x 1 at 2 ohms

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  • Rockford Fosgate Prime R250X1

    Rockford Fosgate Prime R250X1

  • Rockford Fosgate Prime R250X1

  • Rockford Fosgate Prime R250X1

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Our take on the Rockford Fosgate Prime R250X1

by Buck Pomerantz
Rockford Fosgate

My system has plenty of power. Who needs an amp?

You might think you don't need an amp because you have a 400-watt system in your car, or because your new stereo puts out 50 watts a channel. But those are peak wattage ratings, which may boil down to 15 or 20 watts per channel, using the more realistic RMS rating. An amp sends your speakers the power they need to deliver your music with clarity and impact, whether you're using factory speakers or high-performance components. And low-frequency reproduction requires lots of power, so an amp is an absolute must if you're adding a sub to your system.

Rockford Fosgate power for your sub

Rockford Fosgate performance in a small package. The Prime Series R250X1 mono amp can drive a sub with up to 250 watts RMS, so you can really feel your bass rockin'. You can use the low-pass filter and Rockford Fosgate's famous Punch boost to get the best possible bass from the sub and enclosure in your vehicle. A phase switch gets your subs firing along with your other speakers for maximum impact, while the speaker-level inputs let you hook this amp up to almost any system, even a factory stereo.

Rugged performance and value

The R250X1's heavy cast-aluminum chassis efficiently draws damaging heat away from its internal components, ensuring reliable, long-term play. The amp's built-in sensors keep track of the output current and power supply temperature, ensuring that plunging subwoofer impedances (they change constantly during play) or even a short circuit won't hurt anything. The included wired remote lets you control the amp's volume level from the front seat. Your driver's seat will become your favorite place for listening once this Prime amp goes to work.

See more info on this item

Highlights:

  • mono subwoofer amplifier
  • 150 watts RMS x 1 at 4 ohms (250 watts RMS x 1 at 2 ohms)
  • CEA-2006 compliant
  • variable low-pass filter (50-250 Hz, 12 dB/octave)
  • variable bass boost (0-12 dB at 45 Hz)
  • phase switch
  • wired remote Punch Level Control included
  • Class AB amplifier design
  • frequency response: 20-250 Hz
  • MOSFET power supply
  • preamp and speaker-level inputs
  • preamp outputs
  • 8-gauge power and ground leads and a 30-amp fuse recommended — wiring and hardware not included with amplifier
  • no on-board fuses — when installing multiple amps in a system, an additional 30-amp in-line fuse between the distribution block and this amplifier is recommended
  • 11-1/4"W x 2"H x 7-3/8"D
  • warranty: 1 year
  • Our 60-day money-back guarantee

Hands-on research from the Crutchfield Labs (what are the Labs?)

Features and Specs
Performance
RMS Power Output (Watts x Channels)
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150 x 1
Peak Power Output (Watts x Channels)
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N/A
Power at 2 Ohms (Watts x Channels)
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250 x 1
Bridged Power (Watts x Channels)
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N/A
Minimum Impedance Bridged
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N/A
Minimum Impedance Unbridged
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2
Best Frequency Response
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20-250 Hz
THD at Rated RMS Power
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1%
Signal to Noise Ratio
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80 dB
Input Voltage
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14.4v
Features
Amplifier Class
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AB
Low-Pass Crossover Frequency
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50-250 Hz
Low-Pass Slope (dB/octave)
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12 dB/octave
High-Pass Crossover Frequency
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N/A
High-Pass Slope (dB/octave)
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N/A
Bass Boost
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0-12 dB
Bass Boost Frequency
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45 Hz
Fan Cooled
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No
Fuse Rating
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30
Speaker Level Inputs
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Harness
Preamp Outputs
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1 pair
Width (inches)
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11-1/4
Height (inches)
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2
Depth (inches)
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7-3/8
Parts Warranty
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1 Year
Labor Warranty
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1 Year
Product Research
What's in the box?

Download owner's manual

  • Mono subwoofer amplifier
  • Remote Punch Level Control module
  • 18' Remote Punch Level Control cable (RJ-25 connector on both ends)
  • 6" Speaker level input harness
  • 3mm Allen wrench
  • Four 3/4" Self-tapping screws
  • Two 1/2" Self-tapping screws
  • 4 Flat washers
  • Installation & Operation manual (English/ French/ Spanish/ German/ Italian)
  • Amplifier verification certificate

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team — they open the box, verify contents, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Features
Controls
Connections

Features

CEA 2006 Compliant: The R250X1's power ratings and signal to noise ratio are measured according to the uniform standards advocated by the Consumer Electronics Association (CEA). This allows you to accurately compare these specifications for all CEA 2006-compliant amplifiers, even from different brands. Manufacturers who adhere to these standards can display the CEA 2006 logo on their products and packaging. CEA2006 Specifications for this amplifier are:

  • 4 Ohms: 150 watts RMS x 1 at 4 ohms, 14.4 volts, and less than 1% THD+N
  • 2 Ohms: 250 watts RMS x 1 at 2 ohms, 14.4 volts, and less than 1% THD+N
  • S/N: 80 dB, measured at 1 watt output (100 dB measured at rated power)

LED Indicator: The amplifier is equipped with an LED power/protect indicator. The LED illuminates blue when the unit is turned on. It illuminates red if the thermal or short circuit protection circuit is engaged, and the amplifier will automatically turn off.

Mounting: The amplifier can be mounted vertically or horizontally using the supplied mounting screws. The amplifier should never be mounted in an engine compartment as this will void the warranty.

Controls

Gain Control: Use the amplifier's gain control to match the output of the source unit. The rotary gain control is labeled 1 to 11 and has a sensitivity range of 150mV to 4V when using a preamp level signal, 450mV to 12V when using a speaker level signal.

Remote Punch Level Control: The R250X1 includes a wired Remote Punch Level Control, linked to the gain control of the amplifier. The module allows you to remotely control the output level of the amplifier from the dash or center console. The Remote Punch Level Control features a rotary dial, and comes with mounting hardware and an 18' cable.

Note: The Remote Punch Level Control measures approximately 1-3/4" wide (2-5/8" including the mounting flange) x 3/4" high x 1-5/8" deep (2-1/8" deep including the knob and wiring).

Crossover: The amplifier is equipped with a 12dB/octave Butterworth low-pass crossover. The crossover point is continuously variable from 50 to 250 Hz. This being a subwoofer amp, the crossover is always engaged.

Phase: The 2-position phase switch allows you to easily reverse the output phase of the amplifier, choose 0° or 180° to match the rest of your vehicle's speaker system.

Punch EQ: The Punch EQ bass boost circuit is adjustable from 0 (min) to +12dB (max) and centered at 45Hz.

Connections

Power Terminals: The power and ground terminals are nickel-plated set screw terminals and will accommodate up to 4 gauge power and ground wires.

Fuse: An external 30-amp fuse (not included) must be installed on the power wire at the battery. If a wiring kit is used which includes a fuse with a value other than 30-amps, the original should be replaced with a 30-amp fuse.

Remote Turn-On Terminal: The remote turn-on terminal is a nickel-plated set screw terminal that will accommodate up to an 8 AWG wire. It's used to remotely turn the amplifier on and off.

Speaker Terminals: The one pair of speaker outputs is nickel-plated set screw terminals what will accommodate up to 8 AWG speaker wire.

RCA Input Jacks: The industry standard RCA jacks provide an easy connection for preamp level input. They are nickel-plated to resist signal degradation caused by corrosion.

Speaker Level Input: A speaker level input harness is included, making it easier to add the amplifier to a factory radio or to a receiver with no preamp outputs.

RCA Output Jacks: A pair of RCA pass-thru jacks provides a convenient source for daisy-chaining an additional amplifier without running an extra set of RCA cables from the front of your vehicle to the amplifier location.

Wired Remote: An RJ-25 jack is used with the included Remote Punch Level Control.

 
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Rockford Fosgate Prime R250X1 Reviews

Average Customer Review:

4 people say:

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Filter by rating:
4 out of 5

Amp

Written By Zack, Merced California on Saturday, January 25, 2014
Crutchfield Customer Review (What's this?)
 
Very easy to attach to your vehicle, not cheaply made either!!! Hook up to your system couldn't be easier. Simple to adjust and tune once it's connected!
Pros:
Small compact size, inexpensive, easy to fine tune, connecting to your system was simple!
Cons:
Not much to complain about, you get exactly what you pay for.
1 out of 1 people found this helpful
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5 out of 5

Not bad for the size

Written By PillzNY, Bronx, NY on Sunday, July 14, 2013
Crutchfield Customer Review (What's this?)
 
Provides just the right amount of power to the sub I purchased
Pros:
Size isn't big at all. After the right adjustments, sounds great
Cons:
Honestly can't think if any.
1 out of 1 people found this helpful
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5 out of 5

very nice amp

Written By brad, raymore, mo. on Saturday, July 13, 2013
Crutchfield Customer Review (What's this?)
 
This is my first install of any amp. I think I choose wisely! If I had the extra money, I woulda went 4ohm mono at 250rms or more, but that gets expensive. Running at 2 ohms loud, it starts to get hot sooner than later. But good bang for the dollar! Highly recommended.
Pros:
Nice and small, Allen wrench on every terminal! Loved that. Made it easier for me. No matter how ya mount it, easy access to adjustments.
Cons:
Not one.
1 out of 2 people found this helpful
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5 out of 5

Lots of juice!

Written By Jorge, Burleson, TX on Tuesday, May 14, 2013
 
I've never have a small amp that said that it was 250 watts actually do it. I tested this amp and it was putting out 345 watts. I've got it running a single Rockford Fosgate P1 10inch sub in a ported box and it gets loud. I've had others ask me if its 2 12 inch subs.
Pros:
Puts out more power than stated, very compact size, easy installation, looks good
Cons:
None that I can think of
1 out of 4 people found this helpful
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1 question already asked

Can you use 10 gauge wire to hook up this amp? [ Ashton  Aug 05, 2014 ]
1 answer
  • I forwarded your question to an Advisor and they responded with the following: It would not be recommended to use a 10 gauge. The amp calls for an 8 gauge as the minimum size. If you would like to discuss further you can contact an Advisor directly by phone (1-800-324-9695) or online chat. [ Krissy Staff  Aug 06, 2014 ]

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For a more in-depth review and enhanced detailed information on the Rockford Fosgate Prime R250X1, please visit the Crutchfield website product page (/ISEO-rccbcspd/p_575R250X1/Rockford-Fosgate-Prime-R250X1.html ).